What actually is the fix to the 2015 A8 overheating issue?
 

When I bought the car I didn't think it would be an issue here in the UK, but it did happen to me on my last track day, admittedly in above average heat for England.

Is it possible to fix with a few straight forward additions? I have a good American Car specialist mechanic over here, so I'm guessing if I buy the relevant parts he can fit them. Or is it not quite as simple as just buying some parts and getting them fitted and bingo, problem solved?

I'm guessing that's a joke?

Yes. that was a joke.

What overheated? Engine? Trans?

Oil temp was hitting 300 and power was down, after about 12 mins driving hard on track in high summer temps......

Lots of threads on this. Oil temp trends with water temp, running about 40F higher than water. Lower the water temp, and your oil temp will drop also.

In steps of increasing cost with better cooling here are some improvements you can make:

The '19 Auto has a thicker radiator. It's inexpensive ($200) and easy to change. It will help a little. https://www.corvetteforum.com/forums...-radiator.html

DeWitt's makes a combo transmission cooler/secondary radiator that replaces you transmission cooler up front. It's about $700, and will help a little more. https://www.dewitts.com/collections/...cts/c7corvette 32-TC is the part number.

LG makes a great cooling kit, but it's $4000 plus. It will help more still. 2 active members on here have it on their m7 Z06 and love them,

Other vendors make cooling kits up to $10K if you want to race your car.

Good luck. I'm sure others will chime in.

The 2019 model was the fix. Thanks Taadddggggghhhhe!!! :thumbs:

Cool thank you, appreciate the help.

In terms of the actual differences between early and late models of the A8, does it mean there were some major changes to the actual design/build of the car which can't be simply replicated with a few bolt ons for the early models? So your suggestions above will go a long way to solving the issue, but won't make it the same as simply owning a 2019 model? I hope that sentence makes sense, it does in my head.

I don’t think it’s that simple. A 19 auto will run cooler & better than a 15, but it’s only a small step better. The 19 has a larger radiator, but it still has far less cooling than a manual.
I’ve run with a 19 auto at Sebring (I have a 19 M7). The owner, Jon, said his water temps were in the 230s. But Sebring is a very fast track. The faster the track, the easier it is to cool the car. Slower, more technical tracks that are run in lower gears are much harder to keep the car cool. Also, he definitely was manually shifting, and could’ve been shifting consistently below redline.
This was in 90F heat. Obviously running in cooler weather will help.
2017 and up have a an improved supercharger that helps the rear cylinders run cooler. This will help with performance, but I’m not sure if it will help any with water/oil temperature.
2018 & up have an improved track display. They also have an improved magnetic ride calibration.
2019 has a higher flowing in tank fuel pump and stronger rear axles.
Bottom line is the 19 is a better car, but the auto still will overheat pretty easily on small track at high ambient temps.


https://cimg3.ibsrv.net/gimg/www.cor...2d95e05a1.jpeg
Chasing Jon in his 19 auto, turn 1 at Sebring

Take it out of auto and manually short shift it...

Ahhhhh right, I didn't realise that the 19s can still overheat, I was under the impression that the issue was totally sorted, that's why I thought there would be a relatively easy way to make a 15 up to the same standard as a 19.

Yeah I was in manual when it overheated, although admittedly not really short shifting.

I think the guys at spring mountain used to recommend in super hot temps to short shift at like 5800-6000 rpm with little if any difference in performance yet keeps the cars much cooler longer. They said there was hardly any hit to their track times but much easier in the car. Just food for thought.