GSpeed

This weekend we were able to try out Bills 2016 Black A8 Z07 at Circuit of the americas with parts of our all out stage 2 cooling system, in what we dubbed the "stage 0"

The design intent was to extend the duration of how long you can run one of these cars on track, in the summer. It was not engineered to be a fix all, but for those who want to track the car longer, dont want to spend all of the money of the stage 2 kit, and certainly dont want to cut holes in the bumper, this setup is the ticket.

I will update with PDR data when I receive it, but to say this system performed well would be an understatement.

The kit is as follows:

• DeWitts 70mm radiator
• Gspeed fabricated and anodized shroud
• Gspeed cooler shelf
• Gspeed dual pass supercharger heat exchanger in Vmount configuration
• Gspeed engineered blower coolant tank (same tank across all of our kits and cavitation proof)
• Setrab external oil cooler
• Auxillary transmission cooler

The car needs a little more help, which we can give it. Here are some facts, in no particular order:

• Ambient 91*
• coolant temps stabilized sub 240*
• oil temps 290
• trans temp max 250
• no cavitation or throttle shut down
• fastest lap of a 2:19.6 with Bill having a new best of a 20.2
• little to no De-Rating

We will get the car back in and update a few things before it hits the west coast for the summer.

If you dont want to cut your bumper, and you simply want more track time before it does over heat, this is the ticket. It easily doubled, if not tripled the amount of laps possible. There is still lots of room for better cooling by cutting the bumper, but there are lots of C7Z owners who simply dont want to cut or modify it.

Give us a call, or shoot us an email if we can help. This system is so simple and easy to install, given the performance advantage.

Bad Dad

does the tank mount it the stock location?

four0nefive

I think for those with a manual who want a little more assurance, this is the way to go!

Good work as always!

GSpeed

Its up high, and feeds the pump.

5thGear

For guys with manual cars and want to have the intercoolers upgrade, Do you have a picture of the intercoolers location and how air would flow to it and where does exit from.


My thought is if the hot air from the intercoolers dumps in the wheel well then this would help engine cooling as well because:

• Hot air from intercooler would not go to the radiator or engine bay.
• Cold air will increase the efficiency of any radiator even stock radiator.
• For A8 cars, then you would need the full cooling setup that you Gspeed offers.

LagunaSecaZ06

Is the black radiator, that is laid flat, the additional supercharger heat exchanger or the external oil heat exchanger? More details on the picture and list of items would be helpful. Does the front bumper have to come off to install, or is it just for the picture.

I have an 2016 M7/Z06 with the GMPP auxiliary radiator. I am interested in the supercharger tank, but want to know how you bleed it. Do use the bleed fitting on the top and apply a vacuum, or just fill it till the coolant overflows like a brake bleeder.

THANKS!!

Bad Dad

Are you eliminating the stock tank? This looks like a setup everyone can use.

GSpeed

This is great for either trans, and its perfect for those that just need a little more.

We shed the hot air out the bottom, and not in the engine bay. Airflow is the same as the OEM Aux cooler, or the OEM Trans cooler.

The heat exchanger is pictured here, up against the AC condenser. The black cooler is the oil cooler. The transmission cooler is not pictured.





this car runs about 5-7* ccooler with no AUX radiator, but the oil cooler REMOVED from the coolant system. We use the GM AUX space for the blower heat exchanger.

Yes! The stock tank is problematic, and this tank has a lot of engineering, testing, and track validation to insure it is the best tank possible. We have a stock replacement tank in development, but we may scratch that, and retrofit this tank to the OEM system.

We utilize our drybreak bleeder system to fill, and the little bleeder to bleed the tank. We do not fill the tank like every other tank that has a cap. That induces too much air into the system, which causes problems.

Gary '09 C6

a good solution for those not wanting the "full kit" ...

BaylorCorvette

As someone who has tracked at COTA, 2:19 is blazing! What performance mods (aside from cooling) are done to the car?

fleming23

Those slicks help.

desmophile

Hi GSpeed guys/C7 forum guys and gals,

First time Corvette owner here so bear with me. Just beginning to do my research as to what I can do for a 2017 A8 that I will tracking in SLC. 4500' elevation so will probably be making a little less horsepower/heat, but often pushing 100*.

A couple of questions for all:
1 does a 2017 need help, or should I go and find out on the track?
2 how many laps/minutes in your test session with 91* ambient. I won't be running more than 30' at a time
3 I couldn't find anything out about a Dewitt 70mm radiator, only a 57mm one on their website (which got a lot of positive comments), is this a new model?
4 does the 2017 need the supercharger heat exchanger upgrade/will it fit, since they changed that for the '17's?
5 does the trans cooler use the larger fan that you use on your stage 2 setup?

thanks in advance for any advice you can give me, paul

2fastnow

So the A8 cars get hot because..why? The motor works harder to turn the A8? Very odd...very something else I suspect. Can't come up with it in my mind.

Warp Factor

1. Auto transmission and torque converter generate more heat than a manual. Most of that is the torque converter, I would guess.

2. In auto mode, the engine tends to run higher average rpms on the track than a manually shifted car, because the computer chooses the rpm where maximum power is available, even when maximum power can't be used, like in a corner. Higher rpm requires slightly more power, but heat from friction rises substantially as rpms go up.

3. On the '17, the auto doesn't have the extra engine radiator that the manual has, because the transmission cooler takes up that space.

2fastnow

#1 would work to transmit heat if the two were connected A8 in back
#2 answer can be generated by a M7 in a frantic race setting I guess
#3 Fact... that is clear as day...bad radiator engineering as you point out and I hear an engineer at GM saying 'how many race these cars anyway 'eff it, eff them).

Warp Factor

Depends. Sometimes it's faster to exit the corner in a higher gear at a lower rpm, and avoid the acceleration loss of one more upshift on the following straightaway. Particularly with an engine with as broad a powerband as the ZO6.

RyanZ06

Glad you're working on a cooling solution for these Z06's. I am so disappointed with their on track performance, it has kept me from owning one. Chevy really had something special with this car and totally dropped the ball. I can run 2:21 at COTA all day in a bone stock GT3 RS, never an over heating problem... oil temps are 230... that's a 8500rpm motor too! I can only imagine how much faster it would be if we could fit it with those michelin slicks that you run.

GSpeed

Michelin slicks, drop spindles, AP Brake kit F/R. Thats it, in addition to the cooling bits.



The A8 has closer ratios up to 120, it also has the ability to be put in "auto mode" which allows the ECU to select the appropriate gear for best performance. Shifting with paddles delays overheating, but it doesnt stop it.

Never Settle

Post the PDR to the Z06 road course link, we wanna see!
https://www.corvetteforum.com/forums...lap-times.html

Mach .25

Nice work! So the biggest issue is that the bumper blocks the incoming air? I am surprised that any Engineer at GM would allow a design error like this to reach production. Looking at pictures of the front of a Z06, I can see the radiator, so the opening needs to be bigger, can you post pictures?