Lasco001

I have tested the model 2017 automatic and switch.

The automatic makes exactly the same problems:
Oil and water go very high: I have tested on the test rig and on the racetrack. 5 laps and the engine goes into the emergency run

The switch 7M:
The auxiliary cooler works well, the problem is not even so bad

Nevertheless, we are rebuilding all the Corvettes, so that the water temp has a maximum of 90 ° on the racetrack.
The Corvette also delivers the maximum performance

Cölestin

BOBSZ06

https://www.corvetteforum.com/forums...rovements.html

"We will be working on continued improvement of the automatic transmission vehicles but, for now the best choice for customers wanting durable performance in high temperature, hard-core track work is the manual transmission. Torque converter automatics have inherently more heat rejection and will always lag manuals in thermal robustness. Just be clear, neither transmission has an issue in normal street driving, auto cross, or road course work at lower temperatures."

NSC5

The problem really isn't the A8 but that the C7 design which didn't allow enough room for heat exchangers in the front so there isn't room for the added engine coolant radiator that is needed for every Z06 to run well on the track at high ambient temperature. The A8 itself doesn't have a problem of overheating but the designed in spot for its heat exchanger became the spot where the "band aid" additional cooling for the engine itself was installed. LG Motorsports knows and shows how to do it properly in this forum.

Always Red Dave

I thought coolers were added to the 2017 cars for overheating issues? Also in my 2017 Chevrolet Brochure it states that for tracking a Z06 it is RECOMENDED FOR BEST PERFORMANCE FOR TRACKING YOUR Z06 IS TO GET THE MANUAL 7 SPEED TRANSMISSION! I will not be tracking mine its a VERT.

johnglenntwo

This standard fix will now work!

*Not sure if anyone suggested this already, but, ask um why this might be!

davepl

Only the M7 picked up a cooler. All cars (A8 included) picked up timing and intercooler changes that place less load on the cooling system. How much improvement they're worth I don't know.

Mine's an A8 Vert and I've tracked it a couple of times (never overheated it, actually). I wouldn't buy a convertible for regular track duty of course.

Short version of the story is that "Convertibles don't overheat".

23/C8Z

M7's have the auxillary radiator they don't overheat.

A8's overheated in hot temps but many have run them through plenty of sessions without issue. The problem with a stock tuned and 93 octane A8 overheating has a lot to do with the trans running in the track or performance algorithm once it begins to be flogged around the track. If you use the paddles in manual mode you could manage it relatively easy. It still shouldn't have to be that way but it is. Even an A8 at 9/10th'10th's capability whips most other vehicles out there. And the hero lap is always there for the taking.

so to answer your question if you want to hpde the car get an 17 or later M7 or 16 or 15 with the gm performance aux radiator.

if you want to drag race the car the A8 is a lethal weapon and does not overheat.

8850

Not to the point of going into limp mode but my 2017 does have a problem with 1/4 mile racing. When I launched after staging lanes and burnout my manifold temp go up to 136.4* at launch with a 204.8 engine temp. This is pulling timing temperatures. At the end of the track I recorded 152.6* manifold and 215.6 engine coolant. At these temps I was running only 15* of timing at WOT. Normally 20* or more. And this was with an ambient of 48.2*. On street WOT pulls, in Mexico of course, I record just yesterday 123.8* manifold and 195.8 engine temp at 146 mph with an ambient of 51.8*. But this was with the car moving prior and launch temps 91*and 189* coolant.

I still managed a 10.6 pass even with those temps. I would imagine much better even were my temps same as on the street.

johnglenntwo

This standard hotter climate tweak should now work on the A8's. You understand GM cars have emissions and colder climates to cover!

8850

What is a "standard hotter climate tweak"? You mean tuning? Don't want to tune just yet and lose my warranty with only 1300 miles on the car.

Warp Factor

I think he might be talking about the auxiliary radiator (I can't make sense of his posts half the time either).

Will that radiator fit on the M8?

johnglenntwo

The auto transports heat forward, and blocks GMs M7 cooler. But, the better SC setup and engine tuning should allow for better radiator air track cooling. A more simple radiator upgrade working is really your platforms only hope in your situation. A bolt-on not breaking your car won't hurt your warranty!

johnglenntwo

Also try a 160 degree thermostat, and if there's a fan switch option!

8850

A fan switch would do more than a larger more efficient radiator in the staging lanes. Without air flowing across any radiator the engine is going to heat up. Unfortunately nobody I've found makes a fan switch or even knows how to install one on the 2017s. And I've checked with three shops that say it can't be done.

8850

I keep hoping HP Tuner will get their Vehicle controls working so the fan can be turned on manually. So far they haven't been able to figure out how.

okaythen

how many runs did you have prior to this?

but 1/4 overheat it's rare right? or is it common for A8?

Congrat on 10.6, only .2 shy of the best ET ever. hmm to pick manual or auto, tough decision.

8850

Thanks! Only pass I've ever made. The track was so crowded that night I decided to give it up. After viewing my log and seeing how much knock retard with my high temps I logged didn't figure there was any reason to try another pass. I held traction with my Hoosier drag radials so traction wasn't an issue.

The factory fan setting comes on too late with stock tuning. All 2017s are going to heat up like this even 1/4 mile racing unless of course you are able to get to the starting line with a cool engine and intake. If I could come off the highway and immediately make a pass I could probably keep temps down. Hard to do even turning the engine off as the line moves forward with so many cars. For me impossible to have as low temps as I get when street driving and starting a WOT run.

Might mention too. At launch the throttle body doesn't completely open until over 30 mph speed is reached. Has to be more in the 60' with the tb opening much sooner. I have an A8 tranny.

I do have the green filter in my factory air box, ported tb and the Borla mid pipe.

Warp Factor

Which selectable driving mode? Or will this happen in any mode?

Would you be willing to go into more detail about exactly what process you went through (also the the track conditions like elevation, track prep, air density and temp and humidity) to get that 10.6 ET?

okaythen

OMG that sounds bad, I should pick M7 then!!

One poll I saw before but I can't find it no more, it's a poll to see which transmission people pick, it was almost a tie but I was trying to find the thread to confirm. anyone know the poll thread that I am talking about? (What the public pick influences me a little also)

Well hopefully you get more runs the next time and everything works out better, the car probably can go much faster huh. What was your trap and 60'?

8850

I was in Sport mode. I think the only difference in Sport and Track is with the suspension. Stiffer in Track which may hurt 1/4 mile racing. I would think from looking at our file that this torque management is going to happen in any of the modes. I have only read my file and have not tuned the car.

Process - Did a short burn out. Just long enough to see smoke coming off the tires. Probably didn't even need a burnout with these Hoosiers and as well as the track was prepped. And with all the tm at launch. Tb only opens to 40% and timing advance to 8* at launch even with stabbing it hard. No kr so I'm sure a little more advance would help too. At 15 mph tb was open about 70% with advance up to 12*. Ideally 100% by this speed.

The DA was low with a 48* temp. I believe around -800???