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I can't answer about M7 because I have no first hand experience, but my understanding is the M7's now have additional cooling that the auto doesn't have space for. Also, the auto itself is partially responsible for some of the heat generation so the M7 naturally runs a bit cooler to begin with.
Having said that, I think it's a bit inaccurate to describe the auto as "overheating easily". Frankly I have never got close to overheating my car on the street. But I haven't driven in 100+ degree ambient temps so that might affect those who do. Even under moderate track use the car runs hot but not enough to go into limp mode (running the auto in "M" and paddle shifting).
You have to push the car pretty hard to get it hot enough to activate limp mode. If I run the car hard on track and driving in "D" I will overheat and get reduced power messages in 3 to 4 laps at Mosport (2.5 miles high speed 10 corner track). If I paddle shift and short shift at 5,700-5,900 rpm them I can usually run full 20 minute sessions all day without overheating and going into limp mode.
As for cost of private sessions you'd have to call Donna at Spring Mountain to get that info... it depends on what car you're using and I suspect varies depending on what you're doing as well. I have paid different amounts on different occasions.
I just returned from Ron Fellows Performance driving school yesterday. I was driving two different Z06s with A8 automatics. We would drive in manual mode only using gears 3-4-5. It was very hot 106+. I really pushed my cars hard during the lapping (2 instructors told me they liked having me behind them) Neither day did either of the cars overheat and I was watching temps. Don't get me wrong a couple of times the oil temp approached 235 as I slowed down to come in, but never when I was at speed with air flow through coolers. Now they are running 15-50 weight Mobil 1 and I don't know if they were running higher octane gas which would help tremendously. I also will say those Z06s had no where the power my Florida based (sea level) Z06 has at 95 degrees so performance was significantly degraded.
I too, also just returned from Ron Fellows School, ran on Monday/Tuesday last week, both days above 108+, and I need to call BS to over heating. On our last day, Tuesday, ran with 4-Z 06 autos with instructor driving a Stingray, all 4 Z 06 got to run 2 laps up front and during the end of each driver`s 2nd lap, AC would turn off and you know what happens next, limp mode. I talk to all the instructors and they all told me that the Z 06 autos are going into limp mode everyday with these hot temps and running lap times of 1:52 (or faster)on the long North/South 2.2 mile track. All the Z 06`s I drove the oil was running at least 245* + every day & every lap and water also the same. Agree the it seem that the power was lower than my Z 06 running in Tampa, FL. But over heating and limp mode are real and it sucks. When not over heating the Z is a great track day car, hope GM get it fixed soon.
The only thing GM currently offers is the secondary radiator kit which is more like $600. Tadge has said that they were looking at offering a retrofit for the 15/16 to the 17 spec including the supercharger changes at a discount but that hasn't materialized. The $6000 number likely came from someone looking at retail pricing to replace the supercharger with the 2017 spec.
At this point, spend the money for the secondary radiator if you have a manual and are having issues with overheating on track. It really is the bulk of the cooling changes.
Would you share the part numbers for the secondary radiator? I have a 2015 M7 but want to do the cooling mods before tracking it. I've done a reservoir and about to do an upgraded heat exchanger but don't want to drop $1300 on an aftermarket radiator. Thanks.
FYI I went to Bondurant for some training and drove their Hellcat Challenger for 2 days. It overheated when driven hard just like our Z06s. It was 105 degrees though. When driven at 75% it did pretty good and that was even using the a/c. It kept at 220.
For those curious about the status of the case, attached is the complaint as filed on 6/13 and the motion to dismiss just filed by GM on 9/25. The plaintiffs will file an opposition and GM will then file a reply. The matter will then be argued and a ruling can be expected later this year. GM is pushing back very hard.
For those curious about the status of the case, attached is the complaint as filed on 6/13 and the motion to dismiss just filed by GM on 9/25. The plaintiffs will file an opposition and GM will then file a reply. The matter will then be argued and a ruling can be expected later this year. GM is pushing back very hard.
Because they have ZERO plans to do anything with the 15s and 16s
They are pushing back very hard? what does that mean? we don't have a good case against them?
The law firm also sent me equifax class action lawsuit, wants me to sign up I guess. Any of you signed up with them?
Much of the suit is based on GM's advertising statements. I suggest you read p. 16 of the Motion to see GM's response to that. They characterize their advertising that the Z06 is Z06 as “track-proven,” “track-focused,” or “track ready” as merely “[g]eneral statements made about a car’s quality [that] may amount to mere puffery” and ones that "cannot be deemed factual representations." GM goes on to state that "This 'track-proven' advertising does not describe the specific capability of any Z06 component nor is it a guarantee of specific performance levels on all tracks with all drivers under all conditions."
Likewise on p. 17, GM states "GM advertisements describing the Z06 as 'track-proven,' 'track-focused,' or 'track ready' do not meet this definition of [a Magnuson Moss] 'written warranty' because they neither promise a defect-free product, nor guarantee a level of performance over a specific time period. At most, these are 'product descriptions,' not guarantees of specific performance levels."
So, caveat emptor with GM and its Corvette. I think they intend to ignore the problems in our 2015 and 2016 Z06s. As to whether the case is "good" or not, I think the law tends to favor GM. The issue whether GM cares about damage to the brand by ignoring the clear problems that these cars have. As long as they continue to sell Corvettes, I don't think they do.
Much of the suit is based on GM's advertising statements. I suggest you read p. 16 of the Motion to see GM's response to that. They characterize their advertising that the Z06 is Z06 as “track-proven,” “track-focused,” or “track ready” as merely “[g]eneral statements made about a car’s quality [that] may amount to mere puffery” and ones that "cannot be deemed factual representations." GM goes on to state that "This 'track-proven' advertising does not describe the specific capability of any Z06 component nor is it a guarantee of specific performance levels on all tracks with all drivers under all conditions."
Likewise on p. 17, GM states "GM advertisements describing the Z06 as 'track-proven,' 'track-focused,' or 'track ready' do not meet this definition of [a Magnuson Moss] 'written warranty' because they neither promise a defect-free product, nor guarantee a level of performance over a specific time period. At most, these are 'product descriptions,' not guarantees of specific performance levels."
So, caveat emptor with GM and its Corvette. I think they intend to ignore the problems in our 2015 and 2016 Z06s. As to whether the case is "good" or not, I think the law tends to favor GM. The issue whether GM cares about damage to the brand by ignoring the clear problems that these cars have. As long as they continue to sell Corvettes, I don't think they do.
I see thanks for that.
So what about 2017s, that doesn't include 2017s? so they will fix it or it's still part of the lawsuit.
For those who'd like to keep their 15's/16's.... and are looking for more than a hot lap. Track and customer tested. Also the system used on the Callaway SC757 on this months corvette magazine cover. This car was sent our way after Lou met the owner at COTA a couple of weekends ago.
I have a manual but would still like some info on this set up and cost.
Doing a couple of track events this fall.
Can never be too cool.
Originally Posted by Dane@LGmotorsports
For those who'd like to keep their 15's/16's.... and are looking for more than a hot lap. Track and customer tested. Also the system used on the Callaway SC757 on this months corvette magazine cover. This car was sent our way after Lou met the owner at COTA a couple of weekends ago.
I have a manual but would still like some info on this set up and cost.
Doing a couple of track events this fall.
Can never be too cool.
Sure thing shoot an email over to me dane@lgmotorsports.com and I'll send info. I actually noticed after the prev post that the silver car pictured is a 17 so it seems like the problem persists on that MY in hotter area's.
I have been looking at upgrading to a C7 Z06 M7. I am currently looking at a 2015 model. I called up my local GM dealer (not the one I am looking to buy from) and asked about the retro fit parts that were available and what needed to be done to address the overheating issue on the track.
They were extremely helpful and did a bunch of research. They even pulled in a 2018 M7 and put it side by side with a used 2015 M7 they had on the lot to see verify their research.
What they found is (as has been discussed somewhat on this forum) that there is a GM radiator kit that includes hoses which should fix the problem.
There were three part numbers that this can go by. The reason is that it has been replaced by a couple of iterations. In case anyone needs it I am listing all three along with a picture below. The picture was supplied by the dealership I am looking to buy from.
Part Numbers:
84037858
84201727
84309470
I want to extend a big thanks to Josh and Todd at the Penske GM dealer in Indianapolis for their help with this.
09-03-2017, 07:59 PM
