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ZO6 overheating issues ***MEGA Merge***

 
Old 03-27-2015, 10:58 AM
  #1841  
RandomTask
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Originally Posted by chevyfanatic View Post
I may sound stupid but 260 sounds incredibly high to me. Oil temp also sounds nutz. I mean thats way above the boiling point ?
260* is cooking. Even with a pressurized system w/ 50/50 antifreeze, You're getting on the cusp of flashing your coolant. It wouldn't surprise me if there were local hotspots making steam. At those temps w/ hotspots, that motor must have been going through some knarly expansion/tolerances.

Also in regards to the oil; 18psi would be about right at those temps (bringing it back to idle). Its not that the oil breaks down, but has lost all its ability to combat viscosity loss. This is a quick way to wipe some bearings.

I'm starting to get afraid on modding anything at this point. I can only imagine the uphill battle I'd have to fight through GM if I killed a motor and had a K&N air filter on it
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Old 03-27-2015, 11:07 AM
  #1842  
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Originally Posted by chevyfanatic View Post
Wow. I dont track my cars but thats total BS ! I mean the car has oil coolers on top of oil coolers in it ! wtf !

And never herd this about the ZR1 or even old Z06 although it gets toasty in traffic. lol
Such is life with a blower. I love everything about the new Z06 except the forced induction and the heat issues.
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Old 03-27-2015, 11:14 AM
  #1843  
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Does anyone know how many coolers does the car have, not just for engine, but for transmission, brakes, etc
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Old 03-27-2015, 11:34 AM
  #1844  
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Originally Posted by skank View Post
Dave, any specific reason why your using both ChrisN123 and DaveN007 to get this overheating point across? We all know that you are "The Most Interesting Man In The World Of Storage"
Chris is my brother and Greg is friend. We track our cars together mercilessly. I only commented because we thought it was funny that someone was saying that they didn't believe that the car was there that day. I know that the world is filled with 14 year old trolls, but it is not uncommon for it to be 90-100 degrees on a track at during the summer where we drive. My Cayman R would start to run too hot for comfort on a 100 degree day. I would blast the heater to use that core to get rid if some of it. The fix was a center radiator kit. I am sure there will be a solution. It might be as simple as sticking to manual mode and avoiding too many redline shifts. Who knows.

Last edited by DaveN007; 03-27-2015 at 11:45 AM.
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Old 03-27-2015, 11:36 AM
  #1845  
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Originally Posted by DerStig View Post
Does anyone know how many coolers does the car have, not just for engine, but for transmission, brakes, etc
From chevycorvette.com:

Keeping cool under pressure.
Additional cooling elements include larger front fender vents and unique air blades over the inlets on the rear fenders, which force about 50 percent more air into the cooling ducts for the transmission and differential coolers than those on the Stingray. To cope with the additional airflow, the Z06 has also has larger rear-fascia openings than the Stingray.

Standard front and rear brake-cooling ducts, including Z06-signature rear ducts integrated in front of the rear fender openings, are also part of the functional design changes.


So, it appears we have the following heat exchangers and ducting to get air to them--s/c intercooler, radiator, oil cooler, trans cooler, diff cooler (trans and diff coolers are mounted in the back); and we have ducting for funneling cool air to the brakes.
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Old 03-27-2015, 11:39 AM
  #1846  
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Originally Posted by Babaron View Post
Was this car prepped for the track and if so, how? Mileage?
Just the 500 mile oil change (M1). Car has about 1000 miles on it.

Not Z07 package. Stage 1; SuperSports. In the video it does NOT say Track: XYZ-- plus the squiggly lines were flashing a fair bit. I think this means he was in Sport mode and didn't realize it (he said it was in Track, but it appears not). Also, even though lap timer didn't work on video, a sample lap with no traffic he did about a 1:50, so not like he got everything dialed in yet (this is his first session on track with car).

Last edited by ChrisN123; 03-27-2015 at 11:47 AM.
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Old 03-27-2015, 11:52 AM
  #1847  
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Originally Posted by quick04Z06 View Post
Well, 99% of the street cars in the world will overheat at the racetrack, be they American, European, or Asian.
I had my 911 Turbo S out there on Tuesday, ran 6 sessions, 25 min apiece. Not a single issue. On stock tires I ran consistent 1:40.xx which is moving. I've run similarly in a McLaren 12C, Ferrari 458 Spider, and my old Cayman. Never had a heating issue, even in 90+ ambient temps.

Not to mention there were likely dozens of other cars on track this week without issue. So perhaps you meant to say 99% of the street cars WON'T have issues?

Now the question is, why is anyone apologizing for this?
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Old 03-27-2015, 12:01 PM
  #1848  
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Originally Posted by Hypermac954 View Post
I had my 911 Turbo S out there on Tuesday, ran 6 sessions, 25 min apiece. Not a single issue.

****

Now the question is, why is anyone apologizing for this?
Exactly. I'm disappointed. if a few hundred $$ in bolt ons fix the problem, then maybe I'm OK with this, but GM should be embarrassed to deliver the car like this. If overheating were a known thing and the Z07 option included beefy supplemental cooling, I would have gotten it. What's the logic (I know--- marketing) in including Carbon brakes, which mainly add to cost of track consumables, but inadequately cooling the car.

It's going to be a looooong summer. Thunderhill at 100 degs, anyone?

Last edited by ChrisN123; 03-27-2015 at 12:33 PM.
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Old 03-27-2015, 12:12 PM
  #1849  
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Originally Posted by ChrisN123 View Post
Just the 500 mile oil change (M1). Car has about 1000 miles on it.
Did you change to 15W-50?
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Old 03-27-2015, 12:36 PM
  #1850  
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Originally Posted by quick04Z06 View Post
From chevycorvette.com:





So, it appears we have the following heat exchangers and ducting to get air to them--s/c intercooler, radiator, oil cooler, trans cooler, diff cooler (trans and diff coolers are mounted in the back); and we have ducting for funneling cool air to the brakes.
Take a look at the following document. This is a detailed S55 engine specification document released by BMW. This is the engine used in M3 and similar cooling is used in M5. The M5 engine makes very similar power to corvette in real life (heavily underrated, dyno of an M5 and a Z06 are actually pretty close) so the "cooling of 650 hp engine is too hard" argument does not really apply. Please pay attention to how complex and elegant the coolant system is. How many different coolers they have and then compare that with the Z06.

Take a look at page 87 in particular

http://f80.bimmerpost.com/forums/att...6&d=1406475520
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Old 03-27-2015, 12:37 PM
  #1851  
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Originally Posted by QUIKAG View Post
Ouch!!!

262 coolant and 302 oil temp in 5 laps at Laguna in 80F temps is just unacceptable.
It's part of Tadge's secret plan to make the C6 ZR1 obsolete
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Old 03-27-2015, 12:45 PM
  #1852  
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Originally Posted by DaveN007 View Post
Chris is my brother and Greg is friend. We track our cars together mercilessly. I only commented because we thought it was funny that someone was saying that they didn't believe that the car was there that day. I know that the world is filled with 14 year old trolls, but it is not uncommon for it to be 90-100 degrees on a track at during the summer where we drive. My Cayman R would start to run too hot for comfort on a 100 degree day. I would blast the heater to use that core to get rid if some of it. The fix was a center radiator kit. I am sure there will be a solution. It might be as simple as sticking to manual mode and avoiding too many redline shifts. Who knows.
Who was driving when your blue ZO6 blew by that new 911 GT3. It walked on the Porsche throughout the Lap. I just happened to be up above turn 1 and could see most of the track.

Last edited by skank; 03-27-2015 at 12:58 PM.
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Old 03-27-2015, 01:47 PM
  #1853  
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Originally Posted by Hypermac954 View Post
I had my 911 Turbo S out there on Tuesday, ran 6 sessions, 25 min apiece. Not a single issue. On stock tires I ran consistent 1:40.xx which is moving. I've run similarly in a McLaren 12C, Ferrari 458 Spider, and my old Cayman. Never had a heating issue, even in 90+ ambient temps.

Not to mention there were likely dozens of other cars on track this week without issue. So perhaps you meant to say 99% of the street cars WON'T have issues?

Now the question is, why is anyone apologizing for this?
Glad you have had good luck with your cars on track. I would surmise that Ferraris and McLarens, being very, very expensive and very, very limited production, might be able to take the heat bone-stock.

I had a 2009 Cayman S and I could overheat it on track. I began to short shift and keep an artificial speed limit (120) to keep heat down overall and to save my brakes, which could also turn to mush if I pushed it. Nice handling car, though.

Last edited by quick04Z06; 03-27-2015 at 01:54 PM.
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Old 03-27-2015, 01:49 PM
  #1854  
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Originally Posted by quick04Z06 View Post
Glad you have had good luck with your cars on track. I would surmise that Ferraris and McLarens, being very, very expensive and very limited production, might be able to take the heat bone-stock.

I had a 2009 Cayman S and I could overheat it on track. I began to short shift and keep an artificial speed limit (120) to keep heat down overall and to save my brakes, which could also turn to mush if I pushed it. Nice handling car, though.
I had a E90 M3 that would never exceed 265F even in a 100F ambient temp. M3 is really not a limited production car, you can have one now for 40k
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Old 03-27-2015, 01:56 PM
  #1855  
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Originally Posted by DerStig View Post
I had a E90 M3 that would never exceed 265F even in a 100F ambient temp. M3 is really not a limited production car, you can have one now for 40k
Good for you. I hope you enjoy your M3. I certainly enjoyed running past them in my C5Z when I used to track often.
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Old 03-27-2015, 02:05 PM
  #1856  
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Originally Posted by DerStig View Post
I had a E90 M3 that would never exceed 265F even in a 100F ambient temp. M3 is really not a limited production car, you can have one now for 40k
He's back!!!
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Old 03-27-2015, 02:07 PM
  #1857  
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Originally Posted by quick04Z06 View Post
Good for you. I hope you enjoy your M3. I certainly enjoyed running past them in my C5Z when I used to track often.
I'm guessing that was when you weren't actually waiting in the pit for your engine to cool down from overheating.

Sorry I had to say it



You had it coming You shouldn't have made the comment about only low quantity production exotics that cost 200k+ can deal with the overheating....

/Sense of Humor
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Old 03-27-2015, 02:08 PM
  #1858  
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Originally Posted by nethomas View Post
He's back!!!
A little bird told me you guys missed me.
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Old 03-27-2015, 02:14 PM
  #1859  
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Just for the record, I went back to the PDR video and timed all the laps. He was learning/getting faster at a quick clip and the lap that he overheated on was a 1:45, which is a much brisker pace than the 1:50 lap I reported above.

Still, no excuse for overheating, IMHO.

If the excuse is that the shift logic on the A8 keeps the revs higher than is sustainable above certain ambient temps on track (for measurable but not material performance edge over M7), then that sounds like a software bug. If you have the car in "Track" mode and the PDR in "lapping," it would seem that the car should (perhaps in all but the no nannies / ***** out mode) choose a set of operating parameters that are sustainable....
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Old 03-27-2015, 02:22 PM
  #1860  
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Originally Posted by DerStig View Post
I'm guessing that was when you weren't actually waiting in the pit for your engine to cool down from overheating.

Sorry I had to say it



You had it coming You shouldn't have made the comment about only low quantity production exotics that cost 200k+ can deal with the overheating....

/Sense of Humor
My C5Z had a Ron Davis dual core radiator/oil cooler and it never overheated, even running Kuhmo V700s on CCW wheels. The only folks I overheated were people who tried to hang with me in M3s....
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