Originally Posted by Pluggzz

Hey...awesome. I have a blue one with black rims and NY plates, first time here as well...we just arrived. Do you have the auto or manual? Will look out for you on Monday.

Originally Posted by Basil2000

manual. I am leaving tomorrow morning. Staying at the Watkins glen harbor hotel until Thursday. I’m pumped to drive this track but I’m also worried about overheating. Was at palmer 2 weeks ago, water 235 oil 265 and lost power, no warning lights on dash. Was told it was a knock sensor. They cleaned fuel system, injectors and throttle body. Updated ecm, changed all fluids. Mechanic recommend adding aux radiator so planing on that and larger radiator this winter although now I’m thinking about a zr1 or a gt3.

drove it hard in the heat today and so far so good

Originally Posted by Pacembellum

Do you think the intercooler pump shutdown? I would definitely do this new dewitts cooler either way.

Originally Posted by Basil2000

manual. I am leaving tomorrow morning. Staying at the Watkins glen harbor hotel until Thursday. I’m pumped to drive this track but I’m also worried about overheating. Was at palmer 2 weeks ago, water 235 oil 265 and lost power, no warning lights on dash. Was told it was a knock sensor. They cleaned fuel system, injectors and throttle body. Updated ecm, changed all fluids. Mechanic recommend adding aux radiator so planing on that and larger radiator this winter although now I’m thinking about a zr1 or a gt3.

drove it hard in the heat today and so far so good

Originally Posted by atljar

So if I have the Cordes intercooler 2 3/4" core.... Earlier in this post you said you wouldnt expect it to fit with the TC/OC option...


BUT.... What about Cordes fitment with just the coolant option (32-C7Aux?)

Originally Posted by X25

Finally did my first testing with the DeWitts Aux Radiator. Below are my notes:

• OBD2 ambient temp reading is initially correct: The outside temp gauge shown on the entertainment system is not the ambient temp. Perhaps it's something related with the cabin temps? What I can read as ambient temp from OBD2 is correct, until the car starts getting heat soaked. More on this later.
• First attempt with no holes: I did not drill any holes at the bottom for venting during this first test.
• Short day: I stabilized at 237 degrees F coolant at 79 degrees F ambient, during my time right before lunch break. Considering afternoon would be even hotter, and I did not want to exceed 240 degrees F coolant, I cut the day short.
• ORP climate: This track has inland climate. As such, the mornings usually start substantially cooler, and the temp variance throughout the day is significant. This gave me the opportunity to find and match two sessions from before the DeWitts aux rad, and after, with pretty much identical temps.

This is one of the sessions from today. Notice the ambient temp recorded during each lap stays at 79 degrees F for a while, but just as the coolant temps start to pick up as well, it starts creeping up all the way to 87 degrees. This reading is false. The sensor is right by the radiator ducting, and I presume as all the radiators get hot, the sensor gets heat soaked. By the way, this was my last session out before the lunch break, and I've decided to call it the day, since it stabilized at 237 degrees F, and the afternoon would be even hotter.


Since I let it go when it's about to exceed 240 degrees F coolant, I needed to find a lower ambient temp to compare before and after with more stabilized temps. This is a session from a pre-upgrade at the same track (but clock-wise and with R7 tires) with identical ambient temp. Max coolant temps have stabilized around 235 degrees F with 68 degrees F ambient. The lap times are a bit faster (with R7 tires), and average RPMs is about 100 higher.By the fourth lap, I'm at 232 degrees F.


This is from today. By fourth lap, I'm at 228 degrees, 4 degrees lower than before the upgrade in similar conditions.


Results and next steps:

• Results with no vents: I've seen similar drops in different temps, too. In short, I see about 4-5 degrees of drop in temps after the upgrade.
• Next test: At this point, I plan to cut the holes as shown in instructions, protect them with a screen, and see if it helps (and I think it will!).

I am thinking of attending a track day on next Friday to test it out.

Originally Posted by X25

Did my first test with the kit, today! In short, the coolant temps dropped by about 4-5 degrees F when compared against OEM AUX kit. As the next steps, I'm planning to open up the holes as suggested (but protected with grill mesh), and see if it helps. I'm hoping to test it out next Friday at

From my build thread:

Originally Posted by Tom DeWitt

Same problem

Originally Posted by atljar

Any work arounds? I'm sure your intercooler is fantastic like all your products, but Cordes offers multiple inlet and exit fittings from the intercooler for unique and custom plumbing (ie 1" feeds for the bigger pumps out there)

Would you consider making your intercooler with something similar? Basically the hose fittings are all threaded and o ringed on the intercooler. You can swap them from factory push connects, to an, to barb etc etc. This is a very important feature to me, and I would guess others too

Originally Posted by NTMD8R

Tom, I ordered my 32-TO last Saturday (July 6).
Any chance you could check and see when it will be shipped, please?
I'm not in a big rush... just curious.

Thanks,

Gary

Originally Posted by atljar

Any work arounds? I'm sure your intercooler is fantastic like all your products, but Cordes offers multiple inlet and exit fittings from the intercooler for unique and custom plumbing (ie 1" feeds for the bigger pumps out there)

Would you consider making your intercooler with something similar? Basically the hose fittings are all threaded and o ringed on the intercooler. You can swap them from factory push connects, to an, to barb etc etc. This is a very important feature to me, and I would guess others too

Originally Posted by Joe@CPR

hope not haha. that's what makes my system so unique and no one else has ever done it that way on any platform to my knowledge.

Originally Posted by atljar

Sorry Joe, wasnt trying to have someone copy your setup, wasnt my intent. I already have your heat exchanger and its awesome. Its just unfortunate to have to choose between retaining your exchanger, and or switching everything over to dewitts so that I can run their aux coolers. Right now Im on a factory pump, but plans are to soon go with the Stewart 1" setup so the flexibility is nice and desired

Originally Posted by X25

I added the vents for the aux rad, today:


Used this mesh made specifically for car grilles. It has 8x4mm openings.


I was able to flex the bottom covers down enough to make the holes without endangering the radiator core. I decided to use 7" from the tip of the deflector cover. The instructions manual sent with the kit asked for 4" off, and Tom's manual he's shared online asks for 6". Looks like 7" would be perfect with 2" diameter holes to cover the rear 1/4 of the cooler core, so that's where I did it. By the way, I wanted to check with latest instructions, but THE LINK TO INSTRUCTIONS AT DEWITTS.COM DOES NOT WORK!


Zip ties!


It looks nicer in person. I was not able to put the mesh inside, since the inside of the splitter support does not have a smooth interior.


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Initial testing with the vents
I did the same test I did when I installed the aux rad, and went out to highway, driving 60-70 MPH at 5-6K RPM on second gear. Ambient was 2 degrees cooler than last time at ~68 degrees F. Last time, I hit 235 degrees F or so during my short highwat drive, but coolant stayed around 212. This time, the car did not exceed 226 degrees F oil, and coolant was around 208.

Later, on my way home, I kept it at 1st gear, hitting 5-6K 45-55 MPH on first gear. I waited until oil hit 250 degrees F, and coolant hit 216 degrees F. I think last time I hit 245 degrees F oil while coolant was 212 degrees F.

Anyhow, my hunch is that the vents will help for another 5-10 degrees at the track, which is all I'd want if it becomes reality. I intend to test it out at the track on Friday, at RMP.

Originally Posted by Joe@CPR

here is what i would do and it works way better.

upgraded radiator. Better than early years do 2019 Z06 radiator, next step Dewitts, than the absolute best is C&R.
for oil cooler do the prospeed and get it broken out of the path in the front bumper. That will have a huge advantage of putting yet another cooler in the front grill in the way.

Originally Posted by X25

I finally tested out the AUX cooler with vents.

Let's start by looking at the snapshots from logs:


It was a nice day today, at RMP. The temps during my sessions ranged from 66 to 73 degrees F ambient. Clouds also help since RR tires don't like too hot tarmac.


This is the first session. I tried to not have any cool-downs mid-session to ensure everything keeps boiling.


The following sessions saw higher temps, with 73 degrees being the max. Coolant temps settled at ~225-226 degrees F max.


... and this is the session from just two weeks ago, right before I installed the AUX radiator. The difference seems to be about 7 degrees. This is the impact from both new AUX cooler (which seems to have improved by ~4 degrees by itself) + vents. Cool!!


Remarks:

• Improvement: So, there you have it; 7 degrees drop!
• Ambient temps: Due to unusual summer we're having here, these tests were conducted at relatively low temps. I don't think it would be hard to imagine the gap would likely increase between OEM AUX and DeWitts' AUX with vents as the temps increase. I have a bit of data from 80-85 degrees. I'll see if I can come up with comparable data at those temps, too, in same tracks.
• OEM AUX with vents?: This whole experiment also begs the question: how would stock AUX cooler fare if it had the same vents? Would it drop by a few degrees, too? This is not something I'll get to test, but I might convince one of my local friends with C7 GS to do so for testing : )

Next track day will be in Area 27 in Oliver, Canada on Aug 2nd. The current forecast is 88 degrees F, so if the temps stay high, it will be interesting to see how the car fares!
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