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My take on this even it is not a problem with IAT2 temps and it is engine oil, engine coolant or transmission temp problems, something will have to be added to the car to solve these problems. In my opinion retuning the car is not an option for most due to the heavy price you will pay in the event of engine or other powertrain damage with no warranty. As fast as this supercharger is turning I will be surprised if it is not IAT2 temps causing massive amounts of timing to be pulled. There are several companies designing and releasing heat exchange systems to keep the ZR1 cool on a road course for 20-30 minutes as we speak. I have been looking at these systems and some are in the $3,000.00 range or more.
Hopefully some data logs will be released by somebody soon so we can figure this problem out.
I have to call shenanigans on the "it will only happen to a pro" - there are plenty of track rats that can drive hard.
It will be disappointing if this is more than a fluke. A $80k+ track focused car should be able to not need mods to make it through a track day.
Hope it is just a fluke.
Totally agree. My 09 LS3 Z51 would crest 275 degF on the track after about 20 minutes. That was livable since I was nearing the session end. Chevy knows that oil temps are problematic on the track and the C7, either Z51 or Z06 should have been designed and tested to provide a comfortable cooling margin for extended track work. With the elevated power levels, + supercharging, it is a tall order to get rid of all that heat.
My 2006 Z06 used to not go more than 270 degrees at my local tracks, while I had the upgraded Z07 radiator on my 2013 Z06, which had the engine oil cooled by coolant, and also stayed around 270s after the upgrade.
I do have a Camaro SS 1LE, now, and it hit 290 degrees, after which I installed a huge oil cooler (which I posted a how-to on it here), which cured the issue. I heard from Improved Racing that their customers that own C7 Z51 also went with this huge core, and they reported that they stay around 250-260 degrees F at the track:
In his defense, Randy's posted time is his first hot lap ever, and he already stated there was more time to be gained, but they could not try it since the engine overheated and they did not have much time left. I personally think he could easily close the gap if he had time. Milner is GM-sponsored, so he won't talk about any issues, etc., and will have time to get used to the car (if not already, given he drives Corvettes as a job).
Off topic: How do you like tracking the 1LE compared to the Z06. Im torn between the two right now.
Off topic: How do you like tracking the 1LE compared to the Z06. Im torn between the two right now.
I don't know if it's the weight, or the different suspension set-up, or the very stiff chassis (Zeta chassis is very stiff), it was much easier to tame at the track, which increases the fun factor by quite a bit. I am sure you can do better track times with a C7 (Z51 or Z06), but in the end of the day, I strongly believe 1LE would be just as fun, if not more. For instance, I am yet to have a snap-oversteer moment with the 1LE at the track, which was only a bit more throttle away at the track with my '06 C6 Z06 or '12 C6 GS. '13 C6 Z06 with Z07 suspension fared better to be honest, probably due to PTM. Perhaps C7 Z51 is also cured of snap-oversteer and weird lagged suspension movements, but I am yet to drive one at the track.
Well maybe not so evident in the balance of the car while driving. The P cars DO give a very real feedback when driving. GM just has not gotten to this yet and it is one of the gems of the 911. Maybe the new Z06 is improved but unless I missed something Porsche still holds the candle in this dept. Not hate for the Z06 just stating what is true.
i dunno C7 is a pretty balanced car to me.
The hood seems long by comparison to a 911 variant but I disagree its very well balanced.
True.
But then again, neither is a Cayman/Boxster, 'S' model or otherwise LOL.
My Cayman R was exotic. But ****ing Z06s and ZR1s passing me at the track brought me here. Not always, but when they were well-driven...I had no chance. This car was phenomenal.
Not a Z, but I witnessed a stock non-Z51 C7 overheat at a track day. It was running hot all day and eventually came in spewing coolant, and was then very slow to turn over like the engine had started to stick. It would not start again. The ambient temps were about 55F.
Perhaps there is an aerodynamic issue common to both cars? That'd seem odd considering the how well it looks like they ducted the radiator.
As fast as this supercharger is turning I will be surprised if it is not IAT2 temps causing massive amounts of timing to be pulled.
The problem is there are too many unknowns at this point. The blower spins faster but we have been told the vanes have been redesigned to be more efficient. We know the intercooling system is claimed to be 10% more efficient. Those improvements could very well be enough to compensate for the faster rotor speed. Based on IAT2 data from dyno runs that we have so far, the car seems to keep the IAT2 impressively cool, which suggests that power loss is related to some other, as of yet unknown, variable.
While that may explain the power drop off it does not explain the actual over temp issues that were experienced during the RA testing.
Lots to come out in the wash yet! Raising the engine's output raise's the heat. Have to see what developes!
One thing seems to be sure the factory tune sucks!
Big power on the dyno disappears at the strip!
It was confirmed from Randy Post that he got an actual high oil temp warning.
Originally Posted by dlparsons
Am I wrong? there have been two reports of overheating, one on an A8 test car with an oil overheat issue that had been run several times that day. The second being an issue on a new customer's M7 car that had just 700 miles on it where he saw some decrease in power? Have there been other reports of overheating as well? Do two reports in two completely different scenarios make a system wide "problem" with the car? Have there been other reports that I missed?
Originally Posted by BERETTA
My take on this even it is not a problem with IAT2 temps and it is engine oil, engine coolant or transmission temp problems, something will have to be added to the car to solve these problems. In my opinion retuning the car is not an option for most due to the heavy price you will pay in the event of engine or other powertrain damage with no warranty. As fast as this supercharger is turning I will be surprised if it is not IAT2 temps causing massive amounts of timing to be pulled. There are several companies designing and releasing heat exchange systems to keep the ZR1 cool on a road course for 20-30 minutes as we speak. I have been looking at these systems and some are in the $3,000.00 range or more.
Hopefully some data logs will be released by somebody soon so we can figure this problem out.
Originally Posted by GrantB
Not a Z, but I witnessed a stock non-Z51 C7 overheat at a track day. It was running hot all day and eventually came in spewing coolant, and was then very slow to turn over like the engine had started to stick. It would not start again. The ambient temps were about 55F.
Perhaps there is an aerodynamic issue common to both cars? That'd seem odd considering the how well it looks like they ducted the radiator.
Not a Z, but I witnessed a stock non-Z51 C7 overheat at a track day. It was running hot all day and eventually came in spewing coolant, and was then very slow to turn over like the engine had started to stick. It would not start again. The ambient temps were about 55F.
Perhaps there is an aerodynamic issue common to both cars? That'd seem odd considering the how well it looks like they ducted the radiator.
I met a driver that had the same problem/same car. Removed the front license plate, no more issues.
If GM can figure out how to get the ZR1 around the track all day long without these problems they can do the same for the Z06.
I'm still in the break in mode. coming from a ZR1 this is something that GM can certainly fix at their expense. To tune a brand new car and void warranty makes no sense to me personally.
Those who are concerned, should be asking the tuner shops that post in this section about how well the C7Z dynos once it gets hot. Say, doing 3-4 consecutive dyno pulls without turning off the engine or letting it cool. They are so focused on the max (cool) numbers to share with you, but they aren't mentioning the hot numbers. Two local guys, one dropped 20 rwhp, the other dropped 28 rwhp. I wonder what the other shops are finding, but won't talk about.
Those who are concerned, should be asking the tuner shops that post in this section about how well the C7Z dynos once it gets hot. Say, doing 3-4 consecutive dyno pulls without turning off the engine or letting it cool. They are so focused on the max (cool) numbers to share with you, but they aren't mentioning the hot numbers. Two local guys, one dropped 20 rwhp, the other dropped 28 rwhp. I wonder what the other shops are finding, but won't talk about.
Bingo. Hopefully that info will become available soon.
12-10-2014, 05:03 PM
But ****ing Z06s and ZR1s passing me at the track brought me here. Not always, but when they were well-driven...I had no chance. This car was phenomenal. 
Lots to come out in the wash yet! Raising the engine's output raise's the heat. Have to see what developes!
