Overheating C7 Grand Sport on track
08-28-2018, 10:48 PM
#41
Theres a good idea. Are you running oil, or radiator coolant, or blower coolant through there? Looks to be radiator coolant, but wanted to doublecheck.
Does this work on a c7z without any clearance issues also?
I imagine if you had a shroud that went exactly up from that to the hood opening, you would really be doing some damage in lowering temps.
Does this work on a c7z without any clearance issues also?
I imagine if you had a shroud that went exactly up from that to the hood opening, you would really be doing some damage in lowering temps.
Last edited by Mikec7z; 08-29-2018 at 12:03 AM.
08-28-2018, 10:57 PM
#42
Premium Supporting Vendor
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Mikec7z (08-28-2018)
08-28-2018, 11:00 PM
#43
what are your thoughts about tying into the scavenger pump line back to the tank instead of that oil cooler brick fitting replacement 2 line fitting?
Also, what ballpark temp reductions are you seeing with this unit here alone?
Last edited by Mikec7z; 08-28-2018 at 11:46 PM.
08-29-2018, 10:30 AM
#44
Premium Supporting Vendor
Thats not an area where I would want to restrict flow. Difficult to say on reductions, I've only done this in conjunction with multiple cooling modifications.
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Mikec7z (08-29-2018)
09-04-2018, 09:58 AM
#46
Premium Supporting Vendor
Thanks!
Dane
972-429-1963
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09-06-2018, 12:51 PM
#47
Le Mans Master
Eh sort of... Remember that while exhausting out the radiator is a good thing, manufacturers have to engineer for worst case scenario too. What if the customer drives in heavy snowfall, what about heavy rainfall, can I shoot a hose at the vents and hit something I shouldn't if I didn't have the duct, does it affect paint quality, on and on. The duct actually blocks quite a bit of air from the radiator.
I am going to test this with actual data on track in 3 weeks. 1 session with both parts of the duct and 1 session without.
Also, a random question I can't find the answer to. Does the radiator fan turn off past 35 mph if the car is above X degrees? I know it turns off under normal temps but does it come back on even while driving fast? If it doesn't come back on, then I am building up the courage to trim the excess plastic on the radiator fan shroud to help with flow at the track.
I am going to test this with actual data on track in 3 weeks. 1 session with both parts of the duct and 1 session without.
Also, a random question I can't find the answer to. Does the radiator fan turn off past 35 mph if the car is above X degrees? I know it turns off under normal temps but does it come back on even while driving fast? If it doesn't come back on, then I am building up the courage to trim the excess plastic on the radiator fan shroud to help with flow at the track.
You're going to have serious around town cooling problems without that.
09-06-2018, 12:53 PM
#48
Le Mans Master
I have a C7 Grand Sport (automatic transmission) that has had overheating issues on hotter track days (probably high 80's-90's) at Dominion Raceway (VA) and Summit Point (WV).
Overall, I love the car, but I am really disappointed with the overheating issue (which I thought was just a Z06 issue). On my second 30 minute session at Dominion Raceway in June my car completely overheated, systems shut down (power steering..etc) and pretty much all the coolant overflowed. I know hardcore track guys usually go for the manual, but a Grand Sport automatic should be able to handle 4-5 track days a year. I think GM has a design flaw here because there are plenty of other cars on the track with automatics (Dodge Hellcasts, porsches...etc), with no overheating issue. So far, my dealership said this is a known issue, but there is not fix.
Has anyone made progress getting their Chevy dealership/GM to fix/address this overheating issue (which I think is ridiculous as the Grand Sport is marketed as a track car)? If not, any suggested solutions?
Thanks,
Brett
Overall, I love the car, but I am really disappointed with the overheating issue (which I thought was just a Z06 issue). On my second 30 minute session at Dominion Raceway in June my car completely overheated, systems shut down (power steering..etc) and pretty much all the coolant overflowed. I know hardcore track guys usually go for the manual, but a Grand Sport automatic should be able to handle 4-5 track days a year. I think GM has a design flaw here because there are plenty of other cars on the track with automatics (Dodge Hellcasts, porsches...etc), with no overheating issue. So far, my dealership said this is a known issue, but there is not fix.
Has anyone made progress getting their Chevy dealership/GM to fix/address this overheating issue (which I think is ridiculous as the Grand Sport is marketed as a track car)? If not, any suggested solutions?
Thanks,
Brett
I'm pretty surprised to hear this. I run my car ragged on the track and never had anything near concerning temps, but mine is a 2017 manual.
Last edited by village idiot; 09-06-2018 at 12:53 PM.
09-06-2018, 06:46 PM
#50
09-06-2018, 08:26 PM
#51
09-09-2018, 09:35 AM
#52
Burning Brakes
I had exactly the same issue with my '14 Z51 while attending a local PCA HPDE event, my A6 transmission would overheat immefiately after a couple of laps it didn't matter if I was in Sport mode or paddle shifting, the transmission behaved greatly but it's stock cooling system is not at the same performance level. Shame on GM on selling us "track ready" sport models: Z51, Z06 & GS with automatic transmissions that aren't track ready, I can undestand that on a base Corvette but not on a track oriented sport versions. Even Civics were able to finish their laps but not my C7 Stingray, I was very embarrassed. Neither my prior 911 Carrera or my '11 Mustang GT (both) manual transmissions had an overheating issue, I was able to finish all my laps. The outside weather Temp was between just H 80-L 90 F at the time.
- I read that '17 & later C7s received an upgrade to their coolers including to the transmission. Also I read that LG has good options like a bigger transmission cooler that probably I would try once that I'm out of my powertrain warranty.
- For the moment I stopped going to the track and just enjoy spirited driving it, because these automatic C7 cars aren't track ready even beign a Z51.
- Manual transmission C7s are more suited for this type of track use.
Last edited by 911Hunter; 09-27-2018 at 07:42 AM.
09-09-2018, 05:47 PM
#53
Heel & Toe
Thread Starter
Thanks!
I have a C7 Grand Sport (automatic transmission) that has had overheating issues on hotter track days (probably high 80's-90's) at Dominion Raceway (VA) and Summit Point (WV).
Overall, I love the car, but I am really disappointed with the overheating issue (which I thought was just a Z06 issue). On my second 30 minute session at Dominion Raceway in June my car completely overheated, systems shut down (power steering..etc) and pretty much all the coolant overflowed. I know hardcore track guys usually go for the manual, but a Grand Sport automatic should be able to handle 4-5 track days a year. I think GM has a design flaw here because there are plenty of other cars on the track with automatics (Dodge Hellcasts, porsches...etc), with no overheating issue. So far, my dealership said this is a known issue, but there is not fix.
Has anyone made progress getting their Chevy dealership/GM to fix/address this overheating issue (which I think is ridiculous as the Grand Sport is marketed as a track car)? If not, any suggested solutions?
Thanks,
Brett
Overall, I love the car, but I am really disappointed with the overheating issue (which I thought was just a Z06 issue). On my second 30 minute session at Dominion Raceway in June my car completely overheated, systems shut down (power steering..etc) and pretty much all the coolant overflowed. I know hardcore track guys usually go for the manual, but a Grand Sport automatic should be able to handle 4-5 track days a year. I think GM has a design flaw here because there are plenty of other cars on the track with automatics (Dodge Hellcasts, porsches...etc), with no overheating issue. So far, my dealership said this is a known issue, but there is not fix.
Has anyone made progress getting their Chevy dealership/GM to fix/address this overheating issue (which I think is ridiculous as the Grand Sport is marketed as a track car)? If not, any suggested solutions?
Thanks,
Brett
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911Hunter (09-12-2018)
09-09-2018, 07:13 PM
#54
I appreciate everyone's input. I've come to the conclusion that (a) I will just use my A8 GS for spiritied driving and avoid the track and (b) GM failed miserably by not using a DCT on the GS and Z06. Not only is a DCT much more responsive, but this may have avoided some of the overhearing issues. A car is not track capable with a conventional automatic prone to overheating. Disappointed in the GM/Corevette brand.
09-09-2018, 07:48 PM
#55
I appreciate everyone's input. I've come to the conclusion that (a) I will just use my A8 GS for spiritied driving and avoid the track and (b) GM failed miserably by not using a DCT on the GS and Z06. Not only is a DCT much more responsive, but this may have avoided some of the overhearing issues. A car is not track capable with a conventional automatic prone to overheating. Disappointed in the GM/Corevette brand.
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09-09-2018, 09:08 PM
#56
Heel & Toe
Thread Starter
I hate to see you give up on it. Have you had a competent Corvette mechanic take a look? (Try Luke at Criswell Chevrolet in Gaithersburg, MD.) I don't disagree that a DCT would be better, but I and many others with the A8 are not experiencing overheating issues. Maybe I missed it, but were/are you able to post PDR video and data? I'm curious to see whether there is a driving style that would cause overheating on my car.
09-15-2018, 04:24 PM
#57
Heel & Toe
Thread Starter
Now the darn car overheated (coolant steaming a bit, A/C shut off) with a little spirited driving with paddle shifters. I'm going to try another Chevy dealership to see if I can get better results.
Any idea if there is a good POC/engineer to resolves issues like this - I think my car may be defective if it can't handle a little spirited driving,
Any idea if there is a good POC/engineer to resolves issues like this - I think my car may be defective if it can't handle a little spirited driving,
09-15-2018, 04:58 PM
#58
Now the darn car overheated (coolant steaming a bit, A/C shut off) with a little spirited driving with paddle shifters. I'm going to try another Chevy dealership to see if I can get better results.
Any idea if there is a good POC/engineer to resolves issues like this - I think my car may be defective if it can't handle a little spirited driving,
Any idea if there is a good POC/engineer to resolves issues like this - I think my car may be defective if it can't handle a little spirited driving,
Last edited by BrunoTheMellow; 09-15-2018 at 04:58 PM.
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Bdburton32@msn.com (09-15-2018)
09-18-2018, 03:42 PM
#59
Now the darn car overheated (coolant steaming a bit, A/C shut off) with a little spirited driving with paddle shifters. I'm going to try another Chevy dealership to see if I can get better results.
Any idea if there is a good POC/engineer to resolves issues like this - I think my car may be defective if it can't handle a little spirited driving,
Any idea if there is a good POC/engineer to resolves issues like this - I think my car may be defective if it can't handle a little spirited driving,
Left and right an additional cooler
In addition, the oil must be separated from the water.
The LT1 engine works best when the water reaches a maximum of 90-95° on the racetrack.
For that to be possible, you need at least 30% more cooling surface.
For your information, my 800HP Z06 runs in the race maximal with 92 °
Cölestin
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Bdburton32@msn.com (09-25-2018)
09-26-2018, 08:24 PM
#60
Advanced
Now the darn car overheated (coolant steaming a bit, A/C shut off) with a little spirited driving with paddle shifters. I'm going to try another Chevy dealership to see if I can get better results.
Any idea if there is a good POC/engineer to resolves issues like this - I think my car may be defective if it can't handle a little spirited driving,
Any idea if there is a good POC/engineer to resolves issues like this - I think my car may be defective if it can't handle a little spirited driving,
This 2017 GS is freakin' awesome and fun to drive, on the track and off. It handles well, and brakes like a champ. Actually, it chews through brake pads like they're paper. And it's pretty hard on tires. Or I'm just getting better. Don't give up on your GS A8; this is my 3rd Vette, second GS, and the C7 buries the C6 GS in every category. I love my C7 GS A8!