GSpeed C7 Z06 Cooling Development
#1
Supporting Vendor
Thread Starter
GSpeed C7 Z06 Cooling Development
Over the past two months or so, we've been working with Operations's 2015 Z06 Z07 to solve the overheating problems that plague these cars. This thread will detail our development efforts as we narrow in on a solution.
Since we're located at the Motorsports Ranch in Cresson, TX, we've got the ideal thermal testing environment literally in our backyard. For those of you not familiar, OEMs come here on a regular basis in the late summer to stress test cooling systems on track in the 100°+ heat. Our goal for this car is to run a full HPDE session at Circuit of the Americas without overheating. For us (and many other racers) that means more than just not going into limp mode. The car will run with water temps of 235° or more, but we don't consider that acceptable performance for a track car.
As detailed in this thread here (https://www.corvetteforum.com/forums...r-results.html) the first step was a DeWitt radiator and oil cooler. While it made a difference, it was nowhere near enough to solve the problem.
To give a brief history, the car ran at COTA in Sept. 2015 in 100° weather. Water temps were north of 260° and oil temps were almost 300°. The car lasted 6 laps before it went into limp mode and came back in. That was with the DeWitt Gen1 radiator.
In Feb. 2016 in 70° weather, the car ran almost identical temps as the previous summer, but was able to go an extra two laps before coming in.
So while the DeWitt radiator is a step in the right direction, it's clearly not enough for a track car.
The first step in this phase was to install "cheek mounted" heat exchangers for the supercharger.
This involved cutting up the bumper, so for our trials we bought a new bumper so as not to ruin Operations' until we had a final solution.
We knew we were facing a significant challenge. At the risk of oversimplifying the problem, this car simply cannot dissipate enough heat for the power it makes. "X" amount of air entering through the front can only dissipate "Y" amount of heat, regardless of heat exchanger efficiencies, packaging, etc. That fundamental theory is why we chose the LG Motorsports kit.
To attempt to understand the behaviors of the myriad heat exchangers in this car, we set up an Aim MXL2 with eight temperature sensors throughout the engine bay to log various fluid and air temperatures.
We noticed a while back that the C7 Stingray has the same radiator (down to the GM part number) as the Z06. Doesn't really make sense, given the extra 200hp of the Z06, and is most likely part of the problem. So to increase the overall cooling capacity of the system, we added a second auxiliary radiator in front of the main radiator. This radiator measures 18" x 8.5". To monitor the performance of this radiator, we added water temp sensors at the engine inlet and outlet, as well as between the two radiators. We also are monitoring air temperatures in front of all the radiators, between the auxiliary radiator and main radiator, and behind the main radiator. With the two water temperature sensors monitoring the blower coolant temps, we filled up the 8 analog channels we had on the MXL2. It's not as thorough as an OEM's vast array of thermocouples, but we also have a small fraction of their R&D budget.
The eight sensors and extra heat exchangers were arranged like so:
We also fabricated and added a much larger reservoir above the intercooler pump to give it as much of a chance of success as possible, given the increased load. We're already worried about getting heat out of the system fast enough, we don't want to be fighting a cavitating pump. You can also see the two intercooler temperature sensor blocks in the lines just below the reservoir.
Once we got all of this installed, we went testing. We drove one session Thursday afternoon (6/30), but we were fighting the active handling and Ediff the whole time. We were never able to run a full lap "at speed," but we got some very useful data nevertheless. Here's what we learned.
Here's the engine coolant temps throughout the engine bay. The red line is coolant coming out of the engine, purple is between the two radiators, and blue is returning to the engine. You can kind of tell the temperature drop isn't split evenly between the two, especially considering the larger size of the main radiator. More on that in a sec.
Here's blower coolant temps. Same color scheme, red is coming out of the engine, blue is returning.
What was really interesting, though, was the air temps.
Blue is air coming in through the grill, purple is between the two radiators, and red is out the back of the main radiator.
To make things a little more easy to interpret, here's the water temp differential across all three. Calculated by subtracting outlet temp from inlet temp:
And air temp differentials across the main and auxiliary radiators:
Looking at those graphs, it's pretty clear the auxiliary radiator is hurting airflow through the main radiator. Although the overall cooling performance has increased, the total lack of air temp change across the main radiator tells us it's not doing near enough.
What's happening is the hot (235°) coolant is hitting the cool (95°) air coming in across the auxiliary radiator. When that happens, the air is heated up to about 180°, and the coolant is cooled to about 180°. The end result is zero heat transfer across the main radiator.
So for our next test day, we need to rethink how we're running coolant through the auxiliary radiator. It seems like the extra capacity is helping, but there's a lot of improvement left.
Jake
Since we're located at the Motorsports Ranch in Cresson, TX, we've got the ideal thermal testing environment literally in our backyard. For those of you not familiar, OEMs come here on a regular basis in the late summer to stress test cooling systems on track in the 100°+ heat. Our goal for this car is to run a full HPDE session at Circuit of the Americas without overheating. For us (and many other racers) that means more than just not going into limp mode. The car will run with water temps of 235° or more, but we don't consider that acceptable performance for a track car.
As detailed in this thread here (https://www.corvetteforum.com/forums...r-results.html) the first step was a DeWitt radiator and oil cooler. While it made a difference, it was nowhere near enough to solve the problem.
To give a brief history, the car ran at COTA in Sept. 2015 in 100° weather. Water temps were north of 260° and oil temps were almost 300°. The car lasted 6 laps before it went into limp mode and came back in. That was with the DeWitt Gen1 radiator.
In Feb. 2016 in 70° weather, the car ran almost identical temps as the previous summer, but was able to go an extra two laps before coming in.
So while the DeWitt radiator is a step in the right direction, it's clearly not enough for a track car.
The first step in this phase was to install "cheek mounted" heat exchangers for the supercharger.
This involved cutting up the bumper, so for our trials we bought a new bumper so as not to ruin Operations' until we had a final solution.
We knew we were facing a significant challenge. At the risk of oversimplifying the problem, this car simply cannot dissipate enough heat for the power it makes. "X" amount of air entering through the front can only dissipate "Y" amount of heat, regardless of heat exchanger efficiencies, packaging, etc. That fundamental theory is why we chose the LG Motorsports kit.
To attempt to understand the behaviors of the myriad heat exchangers in this car, we set up an Aim MXL2 with eight temperature sensors throughout the engine bay to log various fluid and air temperatures.
We noticed a while back that the C7 Stingray has the same radiator (down to the GM part number) as the Z06. Doesn't really make sense, given the extra 200hp of the Z06, and is most likely part of the problem. So to increase the overall cooling capacity of the system, we added a second auxiliary radiator in front of the main radiator. This radiator measures 18" x 8.5". To monitor the performance of this radiator, we added water temp sensors at the engine inlet and outlet, as well as between the two radiators. We also are monitoring air temperatures in front of all the radiators, between the auxiliary radiator and main radiator, and behind the main radiator. With the two water temperature sensors monitoring the blower coolant temps, we filled up the 8 analog channels we had on the MXL2. It's not as thorough as an OEM's vast array of thermocouples, but we also have a small fraction of their R&D budget.
The eight sensors and extra heat exchangers were arranged like so:
We also fabricated and added a much larger reservoir above the intercooler pump to give it as much of a chance of success as possible, given the increased load. We're already worried about getting heat out of the system fast enough, we don't want to be fighting a cavitating pump. You can also see the two intercooler temperature sensor blocks in the lines just below the reservoir.
Once we got all of this installed, we went testing. We drove one session Thursday afternoon (6/30), but we were fighting the active handling and Ediff the whole time. We were never able to run a full lap "at speed," but we got some very useful data nevertheless. Here's what we learned.
Here's the engine coolant temps throughout the engine bay. The red line is coolant coming out of the engine, purple is between the two radiators, and blue is returning to the engine. You can kind of tell the temperature drop isn't split evenly between the two, especially considering the larger size of the main radiator. More on that in a sec.
Here's blower coolant temps. Same color scheme, red is coming out of the engine, blue is returning.
What was really interesting, though, was the air temps.
Blue is air coming in through the grill, purple is between the two radiators, and red is out the back of the main radiator.
To make things a little more easy to interpret, here's the water temp differential across all three. Calculated by subtracting outlet temp from inlet temp:
And air temp differentials across the main and auxiliary radiators:
Looking at those graphs, it's pretty clear the auxiliary radiator is hurting airflow through the main radiator. Although the overall cooling performance has increased, the total lack of air temp change across the main radiator tells us it's not doing near enough.
What's happening is the hot (235°) coolant is hitting the cool (95°) air coming in across the auxiliary radiator. When that happens, the air is heated up to about 180°, and the coolant is cooled to about 180°. The end result is zero heat transfer across the main radiator.
So for our next test day, we need to rethink how we're running coolant through the auxiliary radiator. It seems like the extra capacity is helping, but there's a lot of improvement left.
Jake
Last edited by GSpeed; 10-05-2019 at 04:59 PM.
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Popular Reply
07-21-2016, 04:46 PM
Supporting Vendor
Thread Starter
We ran our hottest test yet today. It's currently 97° out, and the car did great.
Our big change this time was moving to two oil coolers behind the intercooler radiators. Our previous testing had the oil cooler up front. While it was great for testing out the concept, it wasn't something we could package and sell. This test proved the concept.
Note: lap times are slightly slower than previous sessions due to clockwise run direction.
Lap times:
Lap 1 - 01:42.9
Lap 2 - 01:30.7
Lap 3 - 01:30.8
Lap 4 - 01:28.8
Lap 5 - 01:28.7
Lap 6 - 01:27.3
Lap 7 - 01:25.2
Lap 8 - 01:26.3
Lap 9 - 01:26.8
Lap 10 - 01:25.9
Lap 11 - 01:26.4
Lap 12 - 01:24.7
Lap 13 - 01:28.0
Lap 14 - 01:25.5
Lap 15 - 01:26.6
Lap 16 - 01:25.7
Lap 17 - 01:26.4
Lap 18 - 01:27.2
Lap 19 - 01:25.7
Engine oil temperatures stabilized right around 275°. For 97° weather, we're very happy with that. Other things worth noting:
-Intercooler pump cavitation (and shutdown) is gone.
-Transmission barely got over 250° at the end of the session, running in D the whole time.
-Even with oil coolers behind the intercooler radiators, supercharger coolant temps were unaffected. Further proof that increasing total airflow is the way to go.
Based on today's results, we're going to start moving into the beta production phase of this build. We've identified a few potential testers in various places around the country that will slowly start receiving kits to test and evaluate.
We're starting to get an idea of what the finished package will look like. Below is a picture of the current state of the design. Everything you see in this picture (with the exception of the heat exchanger cores) is made by us.
We're showing you this picture in the hopes that you'll understand the magnitude of what we're undertaking. This isn't a bolt-on part. It's going to take us a few weeks to make our first "production" kit and test it out. The yellow C7Z pictured above will receive the first hand-made beta kit, then we'll start getting them in the hands of our beta testers, hopefully by next month (fingers crossed). Once the beta testers have their kits and we make any changes or tweaks necessary, we'll begin full-scale production. Demand for this kit has been huge, so we're making sure to do it right.
We don't have any more tests on the agenda right now, and we're considering the conceptual design on Operation's car a success. Now it's time to refine the design and get it ready for production.
Jake
#2
Supporting Vendor
Thread Starter
So for our next testing configuration, we decided to reverse the routing of the main coolant circuit. We would be reducing the heat transfer across the auxiliary radiator, but increasing it across the larger main radiator. In theory, that would net us more total cooling. Here's a diagram of how it was routed:
We went out and ran another session, and here's what we found:
There's already a much more visible gap between the three coolant temperatures. That's a good sign that the main radiator is working harder now.
We found this odd anomaly in the blower temps, though. For some reason, blower inlet temperature measurements are spiking for around 4 minutes. We're not sure exactly what's happening since we're not logging mass flow rate or pump amperage, but we've got some things we're going to investigate. Blower temperatures overall seem fine, though.
Airflow temperatures are spread much more evenly, and interestingly enough, the temperature leaving the main radiator is significantly higher than yesterday. We're now seeing temps well over 200° on the backside, when we were barely crossing 180°.
Temperature deltas now look much more like what we'd expect to see. Simple temperature gradients aren't enough to totally characterize a heat exchanger, but in the absence of mass flow rate, etc. we're definitely more confident that the main radiator is working more efficiently than in the previous layout.
We ran the PDR this time, and here's what we got:
Max Water Temp- 250°F
Max Oil Temp- 302°F
Max Trans Oil Temp- 210°F
We attempted to log some ECU parameters with HP Tuners' VCM Scanner since the onboard PDR won't share anything more than a few specs, but the laptop came unplugged from the scanner during the session, so we didn't get anything.
Next, we'll try to re-arrange the heat exchangers to get a little more airflow across the important bits. We're making strides towards a solution, but there's several steps here. Step 1 is getting blower temps down. LG Motorsports already solved that with the big cheek coolers. Step 2 is now getting engine coolant temps down to keep it out of limp mode. Steps 3 & 4 will be doing the same with engine oil temps and transmission fluid temps.
Jake
We went out and ran another session, and here's what we found:
There's already a much more visible gap between the three coolant temperatures. That's a good sign that the main radiator is working harder now.
We found this odd anomaly in the blower temps, though. For some reason, blower inlet temperature measurements are spiking for around 4 minutes. We're not sure exactly what's happening since we're not logging mass flow rate or pump amperage, but we've got some things we're going to investigate. Blower temperatures overall seem fine, though.
Airflow temperatures are spread much more evenly, and interestingly enough, the temperature leaving the main radiator is significantly higher than yesterday. We're now seeing temps well over 200° on the backside, when we were barely crossing 180°.
Temperature deltas now look much more like what we'd expect to see. Simple temperature gradients aren't enough to totally characterize a heat exchanger, but in the absence of mass flow rate, etc. we're definitely more confident that the main radiator is working more efficiently than in the previous layout.
We ran the PDR this time, and here's what we got:
Max Water Temp- 250°F
Max Oil Temp- 302°F
Max Trans Oil Temp- 210°F
We attempted to log some ECU parameters with HP Tuners' VCM Scanner since the onboard PDR won't share anything more than a few specs, but the laptop came unplugged from the scanner during the session, so we didn't get anything.
Next, we'll try to re-arrange the heat exchangers to get a little more airflow across the important bits. We're making strides towards a solution, but there's several steps here. Step 1 is getting blower temps down. LG Motorsports already solved that with the big cheek coolers. Step 2 is now getting engine coolant temps down to keep it out of limp mode. Steps 3 & 4 will be doing the same with engine oil temps and transmission fluid temps.
Jake
Last edited by GSpeed; 10-05-2019 at 05:02 PM.
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Hitman227 (04-27-2020)
#3
Supporting Vendor
Thread Starter
For Saturday's test runs, we laid the auxiliary radiator down horizontally in front of the main radiator.
In this picture, you can see the radiator laying down, along with the super-high-tech cardboard vanes.
Here's a schematic of how we routed everything:
First session of the day was at 10:30 on Saturday morning. We weren't able to get the second air temp sensor wired up in time, so we don't have temperatures off the back of the auxiliary radiator, but here's what we saw for water temps:
Our intercooler fluid gremlin is still present, but otherwise the blower coolant temps seem to be happy around 120°F.
Airflow temps are looking good, you can see ambient temps were about 90°F at the time.
Water temperature differential shows a pretty even split.
Since we only had two air temp sensors on Saturday, we didn't get air temp differential across the aux radiator, but the main radiator is looking pretty strong, with over 100°F air temp change.
Here are the stats we got off the PDR:
Laps Completed: 6
Best Laptime: 1:21.8
Max Water Temp: 232°F
Max Oil Temp: 302°F
Max Trans Temp: 237°F
So water temperatures are now looking pretty good. There's a slight discrepancy between the PDR numbers and our Aim datalogger's numbers, which we'll be looking into further. Oil temperatures, though, are pretty concerning. So for the next session, we rigged up a second oil cooler in the front bumper just inboard of the left brake duct.
Here's the temperatures we saw:
You can see the air temps are much higher (100°F ambient) so everything is pretty thoroughly heat soaked.
What's somewhat interesting is that as the ambient temperatures climb, the main radiator begins to bear more of the load. The intercooler is still pulling plenty of heat out of the blower, and the engine is pretty happy, overall.
From the PDR:
Laps Completed: 12
Best Laptime: 1:22.4
Max Water Temp: 237°F
Max Oil Temp: 302°F
Max Trans Temp: 275°F
We ran 12 laps at an aggressive pace in 100°+ weather, which is a massive improvement over stock. Water temps of 235°ish aren't great, but we'll accept it enough to focus on other problems. Like trans and oil temps. We're a little surprised our extra oil cooler didn't help anything, so we're going to revisit that this week as well. The trans cooler is underneath the auxiliary radiator, so it's no surprise it's not doing much good under there when everything gets hot.
At the end of the day, we put Operations in the car (our test driver had been at the wheel for previous tests) to log some data and enjoy the car.
Overall, things are pretty happy for a supercharged car running in 100° weather. Engine coolant temps reach a pretty happy equilibrium at around 220°.
Temperature gradients look pretty similar to what we saw earlier in the day.
PDR Data:
Laps Completed: 6
Best Laptime: 1:23.8
Max Water Temp: 230°F
Max Oil Temp: 297°F
Max Trans Temp: 275°F
It's pretty clear transmission temps build up at anything over 6-8 laps. That's our next hurdle, getting trans and oil temps back down to reasonable/survivable track car levels.
Jake
In this picture, you can see the radiator laying down, along with the super-high-tech cardboard vanes.
Here's a schematic of how we routed everything:
First session of the day was at 10:30 on Saturday morning. We weren't able to get the second air temp sensor wired up in time, so we don't have temperatures off the back of the auxiliary radiator, but here's what we saw for water temps:
Our intercooler fluid gremlin is still present, but otherwise the blower coolant temps seem to be happy around 120°F.
Airflow temps are looking good, you can see ambient temps were about 90°F at the time.
Water temperature differential shows a pretty even split.
Since we only had two air temp sensors on Saturday, we didn't get air temp differential across the aux radiator, but the main radiator is looking pretty strong, with over 100°F air temp change.
Here are the stats we got off the PDR:
Laps Completed: 6
Best Laptime: 1:21.8
Max Water Temp: 232°F
Max Oil Temp: 302°F
Max Trans Temp: 237°F
So water temperatures are now looking pretty good. There's a slight discrepancy between the PDR numbers and our Aim datalogger's numbers, which we'll be looking into further. Oil temperatures, though, are pretty concerning. So for the next session, we rigged up a second oil cooler in the front bumper just inboard of the left brake duct.
Here's the temperatures we saw:
You can see the air temps are much higher (100°F ambient) so everything is pretty thoroughly heat soaked.
What's somewhat interesting is that as the ambient temperatures climb, the main radiator begins to bear more of the load. The intercooler is still pulling plenty of heat out of the blower, and the engine is pretty happy, overall.
From the PDR:
Laps Completed: 12
Best Laptime: 1:22.4
Max Water Temp: 237°F
Max Oil Temp: 302°F
Max Trans Temp: 275°F
We ran 12 laps at an aggressive pace in 100°+ weather, which is a massive improvement over stock. Water temps of 235°ish aren't great, but we'll accept it enough to focus on other problems. Like trans and oil temps. We're a little surprised our extra oil cooler didn't help anything, so we're going to revisit that this week as well. The trans cooler is underneath the auxiliary radiator, so it's no surprise it's not doing much good under there when everything gets hot.
At the end of the day, we put Operations in the car (our test driver had been at the wheel for previous tests) to log some data and enjoy the car.
Overall, things are pretty happy for a supercharged car running in 100° weather. Engine coolant temps reach a pretty happy equilibrium at around 220°.
Temperature gradients look pretty similar to what we saw earlier in the day.
PDR Data:
Laps Completed: 6
Best Laptime: 1:23.8
Max Water Temp: 230°F
Max Oil Temp: 297°F
Max Trans Temp: 275°F
It's pretty clear transmission temps build up at anything over 6-8 laps. That's our next hurdle, getting trans and oil temps back down to reasonable/survivable track car levels.
Jake
Last edited by GSpeed; 10-05-2019 at 05:08 PM.
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Hitman227 (04-27-2020)
#4
Supporting Vendor
Thread Starter
We had focused these days on coolant temp, with an eye on oil temp. We will continue this week improving coolant with a focus on oil temps and trans temps now that the car will run long enough to heat up the other systems.
Louis
Louis
Last edited by GSpeed; 07-06-2016 at 05:46 PM.
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grecoz06 (11-13-2021)
#5
Safety Car
Wow, this testing is like a dream come true. I feel like I'm getting access to a paid subscription.
Need to soak more in before comments.
The second radiator for the engine is sandwiched with the main correct? Not like GM'second solution?
Need to soak more in before comments.
The second radiator for the engine is sandwiched with the main correct? Not like GM'second solution?
Last edited by SBC_and_a_stick; 07-06-2016 at 04:37 PM.
#6
Supporting Vendor
Thread Starter
Because this is an A8 car, we could not mount the aux radiator like the GM setup. But wait, there's more on that to come
We're validating everything, and a statement with out fact based data is just an opinion. We have data here. And a lot of it. No opinions needed.
Louis
Last edited by GSpeed; 07-06-2016 at 05:46 PM.
#7
Amat Victoria Curam
Sub'd
#8
Safety Car
I ask this because in my regression analysis I get that GM's second radiator lowered temps by only 4*. Of course I have mine horizontally so there is less airflow going through it. I wouldn't get 7 to 8* coolant reduction where I have it mounted. Ron Fellows claimed 14* improvement. I think that's a pipe dream since both our results show it only does less than half of that.
You guys are using the GM aux core correct?
Last edited by SBC_and_a_stick; 07-06-2016 at 05:22 PM.
#9
Supporting Vendor
Thread Starter
Very interested in this piece. Am I interpreting it correctly that the aux radiator brings down coolant temps only 7 to 8 degrees on average? Since it heated up the air and blocked the flow a bit, by the time the coolant makes it's way through the main radiator the aux radiator lowered the overall coolant temps by much less than 7 to 8 degrees correct?
I ask this because in my regression analysis I get that GM's second radiator lowered temps by only 4*. Of course I have mine horizontally so there is less airflow going through it. I wouldn't get 7 to 8* coolant reduction where I have it mounted. Ron Fellows claimed 14* improvement. I think that's a pipe dream since both our results show it only does less than half of that.
You guys are using the GM aux core correct?
I ask this because in my regression analysis I get that GM's second radiator lowered temps by only 4*. Of course I have mine horizontally so there is less airflow going through it. I wouldn't get 7 to 8* coolant reduction where I have it mounted. Ron Fellows claimed 14* improvement. I think that's a pipe dream since both our results show it only does less than half of that.
You guys are using the GM aux core correct?
Post # 3 will explain everything, and you'll be pleasantly surprised, IMO.
Louis
Last edited by GSpeed; 07-06-2016 at 05:46 PM.
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CGZO6 (07-06-2016)
#10
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GSpeed (07-06-2016)
#12
Supporting Vendor
Thread Starter
Alright, post #3 is up with Saturday's three sessions of data. Punchline is water temps are down to "normal" Corvette levels (although still not acceptable), but trans and oil temps are high. Transmission can stay cool for 3-4 laps at a time, but once we started running 12 laps at once, it would cross 300°F.
Tomorrow we're going to wire the MXL2 up to the OBD port since the HP Tuners software wasn't as much help as we thought. That'll give us more information on engine oil temp during each lap, as well as IATs, etc.
Jake
Tomorrow we're going to wire the MXL2 up to the OBD port since the HP Tuners software wasn't as much help as we thought. That'll give us more information on engine oil temp during each lap, as well as IATs, etc.
Jake
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CGZO6 (07-06-2016)
#15
Instructor
Our target temps are:
Water 220 or below
Oil 245 or below
Trans 240 or below
We have the next revision complete, hope to have the AIM setup and a session in before lunch tomorrow.
Louis
Water 220 or below
Oil 245 or below
Trans 240 or below
We have the next revision complete, hope to have the AIM setup and a session in before lunch tomorrow.
Louis
Last edited by Louis Gigliotti; 07-06-2016 at 07:39 PM.
#16
Safety Car
Is this the same track you did 1:18 on stock with Super Sports Lou?
Edited to ask Lou directly lol
Also, it would be great to have the PDR info as well. I want to know whether this track is more like Thill 2 mile or the 3 mile. I overheat on one in 10 minutes but can't break 250* coolant on the shorter one. Since you guys don't have comparisons with a stock car, it's hard to tell what is what. The only solution is to understand the track environment.
Edited to ask Lou directly lol
Also, it would be great to have the PDR info as well. I want to know whether this track is more like Thill 2 mile or the 3 mile. I overheat on one in 10 minutes but can't break 250* coolant on the shorter one. Since you guys don't have comparisons with a stock car, it's hard to tell what is what. The only solution is to understand the track environment.
Last edited by SBC_and_a_stick; 07-06-2016 at 08:13 PM.
#17
Melting Slicks
Really enjoying the process and progress. Where does more hood vents come into play? Cars like the Viper have options for some really aggressive hood cutouts. While I'm sure it won't solve the problem alone and I have no clue about the aero consequences, improved exit ventilation of the confined engine bay seems like it could be beneficial as well.
It seems there aren't that many places for air to exit the engine compartment looking from below. You can try to force more air through the front fascia, but if air can't exit you're not going to get much more forced in.
Ok, I'll go back to being a physician now .
It seems there aren't that many places for air to exit the engine compartment looking from below. You can try to force more air through the front fascia, but if air can't exit you're not going to get much more forced in.
Ok, I'll go back to being a physician now .
Last edited by spearfish25; 07-06-2016 at 08:38 PM.
#18
Nice work.
Curious to know how you calibrated all your temperature sensors, boiling water at 212F? How close do they all read to each other, as you are measuring really small temperature deltas. A 4 degree delta is very small in terms of the overall scale and needs a really tight calibration setup. As you mentioned, you have a difference between PDR data and data from your AIM logger, and in one graph f post #3 it looks like you have coolant temp below 225 F yet PDR max is 237?
Curious to know how you calibrated all your temperature sensors, boiling water at 212F? How close do they all read to each other, as you are measuring really small temperature deltas. A 4 degree delta is very small in terms of the overall scale and needs a really tight calibration setup. As you mentioned, you have a difference between PDR data and data from your AIM logger, and in one graph f post #3 it looks like you have coolant temp below 225 F yet PDR max is 237?
#19
Supporting Vendor
Thread Starter
Really enjoying the process and progress. Where does more hood vents come into play? Cars like the Viper have options for some really aggressive hood cutouts. While I'm sure it won't solve the problem alone and I have no clue about the aero consequences, improved exit ventilation of the confined engine bay seems like it could be beneficial as well.
It seems there aren't that many places for air to exit the engine compartment looking from below. You can try to force more air through the front fascia, but if air can't exit you're not going to get much more forced in.
Ok, I'll go back to being a physician now .
It seems there aren't that many places for air to exit the engine compartment looking from below. You can try to force more air through the front fascia, but if air can't exit you're not going to get much more forced in.
Ok, I'll go back to being a physician now .
Nice work.
Curious to know how you calibrated all your temperature sensors, boiling water at 212F? How close do they all read to each other, as you are measuring really small temperature deltas. A 4 degree delta is very small in terms of the overall scale and needs a really tight calibration setup. As you mentioned, you have a difference between PDR data and data from your AIM logger, and in one graph f post #3 it looks like you have coolant temp below 225 F yet PDR max is 237?
Curious to know how you calibrated all your temperature sensors, boiling water at 212F? How close do they all read to each other, as you are measuring really small temperature deltas. A 4 degree delta is very small in terms of the overall scale and needs a really tight calibration setup. As you mentioned, you have a difference between PDR data and data from your AIM logger, and in one graph f post #3 it looks like you have coolant temp below 225 F yet PDR max is 237?
That being said, calibrating in boiling water is definitely on our to-do list for this week. Not only for the Bosch/AIM sensors, but the OEM water temp sensor as well. We'll be posting those results in this build thread as we go. Hope that answered your question.
Jake
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spearfish25 (07-06-2016)
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Is this the same track you did 1:18 on stock with Super Sports Lou?
Edited to ask Lou directly lol
Also, it would be great to have the PDR info as well. I want to know whether this track is more like Thill 2 mile or the 3 mile. I overheat on one in 10 minutes but can't break 250* coolant on the shorter one. Since you guys don't have comparisons with a stock car, it's hard to tell what is what. The only solution is to understand the track environment.
Edited to ask Lou directly lol
Also, it would be great to have the PDR info as well. I want to know whether this track is more like Thill 2 mile or the 3 mile. I overheat on one in 10 minutes but can't break 250* coolant on the shorter one. Since you guys don't have comparisons with a stock car, it's hard to tell what is what. The only solution is to understand the track environment.
The track is a bull ring, honestly. We see high temps here, we don't see elsewhere. That's ok, because Jake mentioned this track is used by teams and OEMs to test on. The Viper ACR has the street car lap record here, to give you an idea, posted and executed by SRT.
Really enjoying the process and progress. Where does more hood vents come into play? Cars like the Viper have options for some really aggressive hood cutouts. While I'm sure it won't solve the problem alone and I have no clue about the aero consequences, improved exit ventilation of the confined engine bay seems like it could be beneficial as well.
It seems there aren't that many places for air to exit the engine compartment looking from below. You can try to force more air through the front fascia, but if air can't exit you're not going to get much more forced in.
Ok, I'll go back to being a physician now .
It seems there aren't that many places for air to exit the engine compartment looking from below. You can try to force more air through the front fascia, but if air can't exit you're not going to get much more forced in.
Ok, I'll go back to being a physician now .
Nice work.
Curious to know how you calibrated all your temperature sensors, boiling water at 212F? How close do they all read to each other, as you are measuring really small temperature deltas. A 4 degree delta is very small in terms of the overall scale and needs a really tight calibration setup. As you mentioned, you have a difference between PDR data and data from your AIM logger, and in one graph f post #3 it looks like you have coolant temp below 225 F yet PDR max is 237?
Curious to know how you calibrated all your temperature sensors, boiling water at 212F? How close do they all read to each other, as you are measuring really small temperature deltas. A 4 degree delta is very small in terms of the overall scale and needs a really tight calibration setup. As you mentioned, you have a difference between PDR data and data from your AIM logger, and in one graph f post #3 it looks like you have coolant temp below 225 F yet PDR max is 237?
The following users liked this post:
spearfish25 (07-06-2016)