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2016 Z06 Z07 A8 overheating

 
Old 06-10-2019, 08:56 PM
  #41  
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Originally Posted by Pluggzz View Post
This clip is minutes before it overheated. This is only my second time out on a track and you can see the car was not full out. I could see where maybe short shifting could help possibly...but also I don't feel like its something I should have to or honestly want to do.

I was at this event I had the yellow 2016 c7 z06. I wish you would have came over and talked. I heard someone had some problems and left the event. Mines an A8 also. I track this car alot and if you want to track an auto you have to drive it differently. I ran 4th gear through turns 1&2 downsifted to 3rd out of turn 3 and then up to 4th on back stretch. I stayed in 4th all the way around the track until I went to 5th on the front stretch. 1st of all you can roll more speed in 4th and still get plenty of power down. Not to criticize you but you were shifting way too much and taking the rpms to redline. You need to shift right before redline. Preferably at the yellow shift light display, you can go to redline if you dont need to shift like at the end of a straight. I tried going to 3rd in 1&2 and also out of last turn onto the front stretch but oil temps rose too high. You have to finesse an A8, you can pound on an M7. A8 will produce high sustained rpms which causes overheating. I ran 1:00 flats and 59's both days. This was my 1st time at lime rock. I will load up a vid.

Some basic mods that are a must.
#1 wrap the exhaust with dei titanium wrap around the trans, this will cure any trans temp issues. It's not even a factor after this mod.
#2 a good 2/3 mix distilled water to 1/3 dexcool with water wetter in radiator and intercooler system.
#3 vacuum out all the air you can from intercooler system and also the radiator. Tons of info on the intercooler vacuum process here on the forums. But I also vacuumed my radiator and got an extra 2/3 quart in it than what I drained out. Not sure where it had air in the system but it definitely did.

If you want to go all out get the DeWitt large 70mm raditor, intercooler rad and their oil and trans kit. Or the LG package. But you CAN track an A8 car with basic mods and adjusting your driving. If you want to really pound it you'll have to do some more extensive mods.
All that being said, the best temp range to track an A8 is 50 to 70 degrees, the cooler the better for power and grip. I plan my events for spring and fall. Temps at limerock were pushing 80 to 85. I've never tracked mine in temps over 85ish.
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Old 06-10-2019, 09:05 PM
  #42  
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These should help with shifting. I will post my lime rock session tonight.

Full sessions at VIR


Pitt race

Fast lap at VIR


Pocono in July
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Old 06-10-2019, 09:10 PM
  #43  
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Sorry think I posted one twice. This is my best at VIR

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Old 06-10-2019, 09:16 PM
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Originally Posted by JCSIII View Post
Sorry think I posted one twice. This is my best at VIR

https://youtu.be/Dm8V9g_OHkk
Great driving, what mods do you have done to your car? What tires on this run?
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Old 06-10-2019, 09:37 PM
  #45  
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Originally Posted by bbbvettes.com View Post
Great driving, what mods do you have done to your car? What tires on this run?
On that run I had Cup2's and carbotech pads on girodisc rotors, stock calipers. DSC controller.

At this point my only mods are the basic cooling mods in my previous post and the following.
AP brakes
Pirelli scrubs
DSC controller
GM cool air kit
Cat delete down pipes.

This setup is in the Pitt vid and the 1st VIR vid I posted. Using the Vbox Vid and data setup. Most of the vids give setup info in the info section on YouTube.
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Old 06-10-2019, 09:45 PM
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Man, after that list of mods, you might be my non-evil twin

Nice run, what is your name?
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Old 06-10-2019, 09:57 PM
  #47  
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Lol, it's a nice setup. I'm Jim, my biggest problem is I got so used to the stock brake setup that the AP's work too good. Often find myself over braking. Been trying to work on rolling more speed down to the appex. Practice practice.
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Old 06-10-2019, 10:02 PM
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have you encountered "ice pedal" yet from the enhanced brake pads?
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Old 06-10-2019, 10:14 PM
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Originally Posted by bbbvettes.com View Post
have you encountered "ice pedal" yet from the enhanced brake pads?
Oh yeahhhh. 1st time I just put my foot through the floor and brakes kicked in. Past couple times I release and reapply which works perfectly. Got to say its something I'm thinking every time I dive into a hard braking zone. Keeps you on your toes.
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Old 06-10-2019, 10:18 PM
  #50  
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well, thats what I was getting at, don't beat yourself up too much for braking early, better to have a car to drive and a healthy body than have the best lap time ever.

You know how to prevent it right? Just put your toe barely on the brakes ahead of time, and then engage full blast.

Its all based off of an algorithm that looks for the time to be too short from the time you apply them to the time your tires lock up.

So if you stab the brakes quick, its likely to happen

If you touch your toe on them a second in advance from when you slam them hard, you will never have it happen again.
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Old 06-10-2019, 10:23 PM
  #51  
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what part of the world do you live?

Also, I'm confused by your G meter, it never goes below 1G in some of the videos. It should go back to zero and then show your G's build as you come into curves and braking zones, etc.

Last edited by bbbvettes.com; 06-10-2019 at 10:31 PM.
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Old 06-10-2019, 10:42 PM
  #52  
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Originally Posted by bbbvettes.com View Post
what part of the world do you live?

Also, I'm confused by your G meter, it never goes below 1G in some of the videos. It should go back to zero and then show your G's build as you come into curves and braking zones, etc.
Im in Chesapeake Virginia. Some of the older vids are using a garmin virb camera. Never figured that out myself. It also never showed throttle over 86%. That's why I bought the racelogic vbox setup. Vbox vids have the yellow Corvette jake skull on them. Vbox is an awesome system if you dont have a pdr.
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Old 06-10-2019, 10:44 PM
  #53  
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could it be that the G meter was at the wrong plane/tilt?

Meaning, you had one of your axis vertical that should have been lateral, and thus it was measuring gravity at all times?
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Old 06-10-2019, 10:45 PM
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whos the fastest guy in a stock Z with only brakes and tires at VIR? Any idea?
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Old 06-10-2019, 11:13 PM
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Originally Posted by bbbvettes.com View Post
whos the fastest guy in a stock Z with only brakes and tires at VIR? Any idea?
"Porsha" on this forum is fastest I've seen. He ran a 1:57:xx on pretty much same mods as me but he has a M7. I'm sure theres some others. As far as a totally stock Z06 probably Jim Mero.
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Old 06-10-2019, 11:15 PM
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Originally Posted by bbbvettes.com View Post
could it be that the G meter was at the wrong plane/tilt?

Meaning, you had one of your axis vertical that should have been lateral, and thus it was measuring gravity at all times?
Probably. It works in a car with an obii module or a bike, motorcycle or a plane. Probably works running too lol.
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Old 06-10-2019, 11:24 PM
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alright... maybe I will have to set some tires on VIR for the first time in my life and see how short I can make the learning curve appear

I will let you know if I make it over that way, I would love to follow you around a few times.
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Old 06-10-2019, 11:26 PM
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Here's my 2nd session on day 1 using only 4th and 5th gear. Really need 3rd after turn 2 through 3&4. This was my 1st time here, I was trying to get my line down and braking points just feeling it out. I'll load another vid using 3rd 4th 5th.


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Old 06-10-2019, 11:48 PM
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I've got a kit that will solve your overheating.

We are testing it. You can be a tester, but I don't expect anyone to jump on board quickly as it involves cooling the engine oil.

Frankly, hindsight 2020, I should have just used the HX to cool radiator fluid down further, then it would not be so spooky for people to test on their cars. I could send you a kit to cool the radiator fluid and then you can test it, but I would need the true wholesale price of the parts paid for from you to me. I would not charge you profit.

So far, we are having no issues with it, we had a car pegged at full throttle for almost 10 min the other night. We would let off the throttle, hit the brakes, come back down to 100, and then full throttle for a couple of min, and then hit the brakes, and do it again, over and over, up to 185 sustained... trying to starve the engine of oil.... making sure our circuit does not interfere with engine oiling.

Don't ask for location details, but I can tell you, I'm not lying.

With the fan we are using, you don't have to cut the nose of your car like the other "cooling vendors" do.

Ignore the ugly bracket in this video.


Last edited by bbbvettes.com; 06-11-2019 at 12:00 AM.
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Old 06-11-2019, 07:14 AM
  #60  
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I thought I read a response from Tadge on this issue indicating that overheating is not problem if you track the car at 85 degree F or lower track ambient temperatures. Apparently, the car was designed to be tracked under certain track conditions. Tracking the car in the desert at 120 degrees F will challenge many cars. The fact that GM has apparently improved the cooling in 2017 and later cars to reduce the concern about track ambient temperatures is to GMs credit. I wonder what the new higher track ambient design temperature is with the improved cooling on 2017 and on Z06s?
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