Beatnik

Despite "not overheating" the extra power disappears after the first fast lap after the intake and heat exchangers heat soak. We've seen it many times on track.

928nomore

I just had the car to the dealer and he confirmed, that the car had thrown a code P1101 ( even though no lights came on ) this retarded the timing by 10-15 degrees and likely cost me 100-150 hp. The Chevy Tech told me the computer said the fault occurred at 12:41 pm at wide open throttle at 134 mph. The water coolant temperature was 241 degrees, the ambient air temperature outside was 91 degrees the intake air temp 115 degrees and the tank had 51% of its fuel left.

Possible causes were low octane fuel ( I put 93 in it always) or a malfunctioning Mass air flow sensor. He reset the code . Perhaps a Halteck would be the answer

brkntrxn

There's your problem.

froggy47

Your car pulled a high % of it's power off the table to save a meltdown.

GM knows about it & will advise you that is working as designed.

I am starting to feel bad for the guys that put down their hard earned money for c7z. Not being a wise azz, seriously, I feel bad for you all.

FASTFATBOY

I went from 200 tread wear tires to Rcomps and the first three sessions I ran the same times as I ran on the 200 tread wear tires....I was baffled.

Last session of the day I tried to relax and let the car roll more entry speed, the 200 tread wear tires really wouldn't allow it.

After my brain overcame the higher entry speed(hard for me to do, I'm skurred) the lap times started coming down.

Your brain does get programmed as to where "it's limit" is. This is why a pro driver can hop in your car and whip your *** in it after you thought it was all tapped out for speed.

rjkc5y2k

[QUOTE=SquatchMachining;1590105513]I have personally logged two individual C7Z's on the street, both heat soak, both pull timing. So they absolutely do. I really don't think the C7Z should have had a blower on it.. A direct injected version of the LS7 would have been bad *** and probably made 560-570 whp on engine alone if done correctly from the factory.[/QUO TE]

I totally agree a NA C7 Z06 would have been a better choice. I think this may have been an accounting decision. Rather than have two models for the C7 like a Z06 and a LT1 it was cheaper to have one model. One other thought is maybe a NA Z06 would have had emission issues due to the higher HP than the 6th generation Z06. Would like to have someone from GM Corvette division make a comment.

miracle_whip4130

Here you go: https://www.corvetteforum.com/forums...on-the-c7.html

LateBreak

I can't figure out for the life of me why they don't go overboard on cooling for these cars, rather than just making it 'good enough'. Sure, it will weigh more, but not that much. The Germans seem to do it with consistency, but here we are 2 generations from the C5 and they still won't do it from the factory.

It seems to me that the words '100% duty cycle' aren't part of the engineering vernacular in Detroit.....

miracle_whip4130

The reason is simple, these cars are marketed as track capable cars but 95% of them are just putting around as a Sunday cruiser for 2k miles a year. Most people don't actually track the cars, so it either cuts into GM's profits or raises the cost of the car to include suitable coolers that most people won't notice anyway. GM has done the cost analysis and determined it can make more profit by just selling them as they are now and dealing with a few displeased track rats.

The other issue is that the bigger coolers would add additional weight and possibly drag, which would decrease fuel economy, which also sells cars. The styling may also be changed if they have to enlarge air intake ducts, etc.

z06801

I agree my 2002 911 turbo though far from a track star, will run a 25 minute session in Utah thin hot air and not budge the water temps.

StreetSpeed

Precisely.

flash911

If nothing else, sounds like an opportunity for the aftermarket.

miracle_whip4130

Yup, plenty of people still buy the car to make GM money and then the track rats pay more out of pocket to get aftermarket coolers, just like with the previous Z06s. One of the vendors on here will come out with an adequate setup for the C7 Z06.

Ludeaem

The last few posts sum up 99% of car forums. We are a niche market in the end.

miracle_whip4130

I think in one of the ask Tadge posts he said they've made 8000 or so C7 Z06s..........and we have what, a dozen people on hear complaining they overheat on track? I mean I guess it damages the image of the car because GTR fanboys and the like are quick to spread the word that the Z06 has issues, but that won't stop the average rich 60 year old American from still buying one so he can wax it every weekend, and so it's still not worth it to GM to address the issue.

I think the reason Porsche and BMW take a different stance on this is because of target demographics. I would say a higher percentage of their buyers actually track their cars and beat on them than Corvette owners.

bags142

Exactly!

PCA and BMWCCA

And Porsche is the best. Buy a GT3, get a free HPDE weekend!

FASTFATBOY

Do a search in the C7 Z06 section for "overheat".....12 pages I think it was?

z06801

Exactly, I instruct for PCA I can't believe how many people track their new Porsches, not just GT3s but reg 991 and 991S

FASTFATBOY

The Z07 should have been the "track rat", cut the crap off the car, boost cooling to go along with the carbon brakes and the aero kit.

Leave base Z06 for the waxers and retirees

moose.b3

[QUOTE=FASTFATBOY;1590160570]The Z07 should have been the "track rat", cut the crap off the car, boost cooling to go along with the carbon brakes and the aero kit.

Leave base Z06 for the waxers


Fixed it for you. I don't know about the area you track your car, but around NorCal there are plenty of "retirees" that enjoy track days.