Whoa, I did not overheat running 1:44 at Laguna in 54* weather. You can't combine my reviews together to make them sound like what you want them to.

A stock S2000 is only good for 1:50.x at Laguna Seca and that's without lifting near the sound booth, which I had to do with the Z. I was running 1:54.x before I sold my stock S2000.

For the record I'm not claiming Poor-sha cannot drive the Z fast enough. Maybe he can do 1:30s, I don't know. All I'm saying is, the way he drove it for these laps posted, whether instructing, cooling off, or whatever, is not consistently close enough to what the Z can do to expect any overheating.

 

I have been following A LOT of threads in regards to tracking and overheating issues. Some have problems, some don't. Many who state they don't have over heating problems aren't really pushing it to the limit, so it seems. On the bright side, I have seen some who push it to their limit with no problems. It will be interesting to see the total collection of data for an entire year of tracking, and if GM will address any "known" issues. This is part of the reason why I have waited for the 17/18 model year, plus I was interested in the Callaway Package. Now I just need to see some track data w/ a Callaway Vette but I have a feeling those will more than likely be 1/4 mile racers and not road racers.

 

I actually said the opposite...you overheated in warmer weather not the weather in which you ran a 1:44. Honestly, that's the only lap time I ever saw you post, so not sure what your lap times were in warmer weather when the car did overheat the PS and ECT.
S.

 

I decide to upload some raw data so we can look more closely at how the car handles heat and it turns in to questioning my driving. FWIW I've been to this track 3 times before, twice in a crown vic for a few laps, and once for a day in my C6Z 3 years ago. So yeah, it's not my best track but I'm not out there doing parade laps either.

True, there were some laps where I slowed. Once because I was low on fuel and thinking of going in and again because I was doing lead follow with a friend. Anything else was largely traffic.

This is not a big HP track and the S2000 we are using as a benchmark at a minimum had a wing and RA1s. Here are what the well used Super Sports looked like that I took off at the end of that day.



Lucky for us I decided to upload the video of the entire 5th session for DLC7.

 

I spoke with Mr. Scott some time after he finished building Shenendoah. To say that he was anti-big-HP would be a huge understatement. His ideal car on that track: a kart. Not a car.

That Sean is able to hustle his "big" Corvette around Shenendoah at that speed is a testament to both his driving prowess and the car's ability. Shenendoah is not a friendly track to cars like ours.

(And it makes me puke when I'm driving it... which is odd!)

 

Like I said you may have given some light on how the car can build heat, and shown one factor. By itself not too much damage, but, I think as time goes on we will surely see the full essence of the heating up thing! Thank you for your contribution!

GM has seen it ALL by the way!

 

I got much faster since my first track day in the Z lol. Laguna is also not a good comparison with other cars because the Z gets killed by the sound regs.

The Thunderhill 2 mile is also a tight, twisty, kart-friendly track. To me the Z is a lethal weapon on it. We can generate more lateral G than most of the cars on the track. The Z is an all around great performer. It's no Hellcat. It's a momentum and a high HP car, good everywhere.

To overheat this car I think every lap has to be under what a slightly modded S2000 can do. The Z is an aluminum frame, 2.5 more powerful, 50% larger patched vehicle. There is an average of 15 second difference stock for stock between the cars. I can cut down my times at least 10 seconds between the two cars regardless of the track. I don't think the temps that Poor-sha posted are any different than what my car would do if he was driving it looking at the data. That is my only point.

Anyway, the IATs look good ... Where is the IAT sensor located?

 

Maybe I'll never be able to "only drive flat out" or meet whatever metric you think counts as pushing the car. However, I'm enjoying the heck out my C7Z, just finished my 14th day totally 35 hours on track, and currently hold the fast laps on the board at 4 different tracks in it. Pity me.

 

I can tell you for a fact that's true. You'd have to be in your teens and backed by sponsors to have a chance at setting a record that matters. None of us are even close to being a pro. Pobst certified this car at 5 minutes in 85* but no more, that's really the test that matters, a 3rd party test done by a pro. We're all slow in the grand scheme of things. Do you think if he drove your car vs. the one that was given to Motor Trend the same would not have happened?

I believe the IAT sensor may be in the TVS housing post-compression so those are nice numbers. No timing pulled.

 

SBC, I really don't want to turn this thread in to another debate that is just going to get merged in to the great combine. It doesn't matter to me what Pobst or Pilgrim or O'Connell can do in my car. What matters is what I do in it. I'm faster and more comfortable in this car than I ever was in my Katech Track Attack Z06 - so much so I put it up for sale.

These threads have created a sort of hysteria that has folks afraid to drive in traffic not to mention take it to the track. I'm just trying to show that you can track the car quickly without issues if you are a mere mortal.

Now yes, I agree on the IAT and found the way they spike and then drop once moving really interesting. Is there a pump that circulates the coolant through the intercooler? I'm wondering if I should leave the car running for a while when I come off track to keep things circulating.

I also found it interesting what DLC7 pointed out that on laps when you aren't pushing the car but are tucked up close behind another car the temps stay relatively high. Perhaps the issue is more with airflow than the radiator/oil cooler itself?

 

I'd like to thank you for taking the time and effort to record your data and putting it together in this thread. It is much appreciated! It is quite interesting to read up on everyone's experience.

Now, if we could get Snorman, SBC, and anyone else who tracks their car to a showdown. That would be fun to watch!

 

If it's not radiator/oil cooler itself I'm again curious to see if Callaway's package will help. Bigger charger, better air flow, less rpm, but more torque so more heat? No one has pinpointed the exact cause for "heating issues", have they?

 

Thanks Shayne and based on your screen name thank you for your service. Semper Fi.

 

Typical stuff, the car sits there at the grid heatsoaking. Once you get it moving it takes air in like a beast. Stays fairly cool the entire time. The only noticeable difference to me is from session to session and that has to be driven by the ambient temp. The day typically gets hotter and hotter but sometimes the very last session ambient temps go down.

I think you need to see IAT2 to judge the intercooler.

 

The fastest lap run is a 1:39 out of the set. There are very few laps even within 2 seconds of the fast lap, and certainly not even 5 in a row that are even in the sub 1:41 range. That is why the car is not overheating. Laptimes are very inconsistant in terms of how close they are to the best laptime. If I ran my car at such variable and slow laptimes, I too would not get "Engine Overheating" warnings.


It's like the manager of the Ron Fellows school e-mailed me: when students run the cars, they have no overheating issues, but when the instructors run the cars, they overheat them easily. If I run my car until it starts to overheat and then back off by just a few seconds per lap, then the temperature of the coolant falls quickly. But that is not how I drive, I like to go flat out every lap I can, and that is when the issues come up. And I have no idea how fast a Z can be taken around that track compared to the 1:39 lap, so that is another possible factor.


People who think the overheating issue is just on some cars are drawing the wrong conclusion from incomplete data. My Corvette overheats every time I take it to the track and can run multiple steady laps without much traffic in temps just below 86 F. Let's see 6 laps within 2 seconds of the best lap time a Z can do in 86 degrees F and see if the car does not overheat. By the way my car is a Z51 and I can easily overheat the coolant temp, same exact radiator as the Z06.

 

"IAT1 is located in the MAF assy, and the IAT2 is in the lower plenum measuring temps downstream of the intercooler." according to http://www.stingrayforums.com/forum/...lications.html

Ok, so which IAT is captured here, IAT1 or IAT2?

 

According to his review "-Best Time of the day/Session achieved: 1:37.74"
https://www.corvetteforum.com/forums...post1590093086

 

I don't know. Aim Race Studio 2 just shows an ECU_IAT value.

 

Correct. The Aim and PDR differ slightly in lap times because the start/finish is slightly different because they are manually set. If you look at the video from my fast lap I am closing on traffic and have to lift at the end. That could explain why the Aim only shows a 1:39 but the PDR 1:37.

I feel like I answered descartes question earlier when you asked it but I guess you guys must have track days where everyone is must faster. Watch the 30+ minute video and notice the traffic. I also slowed up at the end to do lead/follow with a friend in his C7.

 

Yes there is a pump. Down low on the drivers side front. You can barely see it or touch it, but its there. If similar to the ZR1, it runs all the time (and will throw a code if inop in the ZR1)