Originally Posted by Pluggzz

Thanks for the explanation. So is it then overkill and not necessary to get the 70 mm with the TC?

Originally Posted by Tom DeWitt

That's hard to say. You will have the maximum cooling and the oil temps will benefit from that. So this combination works too. Who ever thought this kit up is a real genius!

Originally Posted by Pluggzz

Thanks for the explanation. So is it then overkill and not necessary to get the 70 mm with the TC?

Originally Posted by Tom DeWitt

TC vs TO I've been emailed a few times for my opinion on this issue so here is my explanation

The goal was to make faults impossible, no matter how good or bad of a driver you are and how hot it is outside. Time will tell if that's the case but I dare someone to tell me the TO kit and with the 70mm faulted.
This should work because it (TO) takes care of oil faults and increases cooling by subtracting load. The 70mm radiator is a beast and you cannot put anything bigger in there.

It's been said the TC in a A8 is just like having a GMPP in the M7. This is true and most people said that it works for cooling. This takes care of 98% of the drivers. Now I might sound like Bernie Sanders, but what about the other 2%. They are going to end up adding a bigger radiator and if you add that, you don't really need the half cooler anymore. The TC has value and it will have an effect on oil temps but my personal preference is to have a dedicated cooler for coolant (radiator) transmission, and oil.. That's just me, six of one, half a dozen.

Originally Posted by BrunoTheMellow

Have you tested the 57 mm vs the stock c7 radiator size (I think it's a 25 mm or 26 mm).

Originally Posted by BrunoTheMellow

Tom in the Gspeed thread you said the 70 mm radiator was measured to be 10% better than the 57mm radiator. Have you tested the 57 mm vs the stock c7 radiator size (I think it's a 25 mm or 26 mm).

Originally Posted by peterjank

Sorry to butt in here, but I have some data that may be relevant. I do not have a direct comparison between DeWitt's 57mm radiator and the stock C7 radiator. However, I did a comparison of the Ron Davis radiator and the stock C7 radiator after I installed the Ron Davis radiator back in 2015. (Please see link below.) I expect the results for DeWitt's 57mm would be better and I will be swapping to that shortly along with their 32-TC kit. If I get an 80 degree to work with, I should be able to add that data to the comparison below.

https://www.corvetteforum.com/forums...-radiator.html

Originally Posted by BrunoTheMellow

I would get it if you got the $. Just because you're not hitting limp mode doesn't mean you aren't losing power. At 240+ coolant temp , the Z06 has no more power than an lt1

Originally Posted by thebishman

You are making an assumption that with the hot engine oil removed from the radiator circuit you will still see water temps that high. I strongly doubt that you will, and by my reading Tom is alluding to the fact that on an A8 car equipped with the combo Transmission/Engine Oil cooler you will not see any “faults”. This should include the ECU pulling power due to high engine temps.

However, if one is a fast Advanced driver at your local HPDE, personally I’d throw the 70mm radiator in the car also.

Bish

Originally Posted by X25

Tom, any news on the coolant only (one piece) version that replaces the AUX rad? I would love to give it a shot in mid-summer, when the temps pickup, to see how much it helps on coolant and oil. I'm also guessing it will be a simpler kit?

Originally Posted by Tom DeWitt

You can order one from the C7 products page. It's part number 32-C7AUX from the pull down menu. We made one for LagunaSecaZ06 but haven't heard any feed back yet

Originally Posted by X25

Great, found it!

Since there's no explanation for this option on the site: Does it come with any hoses, etc.? I am wondering if it also replaces any hose that you mentioned might be limiting the flow rate. I presume it also comes with the same instructions re:enlarging the opening, etc. Please let us know : )Oh, I also presume it has about 2x cooling capacity (since half of it was about same as OEM AUX cooling capacity)?

Originally Posted by Tom DeWitt

I am working in the instruction sheet. It does involve similar cutting but slightly different. It's not 2x the GMPP because this Aux (15.5") unit isn't as long as the combo cooler (19.5") The surface are is 1.5 x or 50% more and if you follow through with the deflector modification and lower venting the rating will be much higher than not. You will re-route the existing hose from the oil cooler to the Aux. We will supply a new longer hose to go from the oil cooler to the Aux. No restricting steel lines.

Originally Posted by Tom DeWitt

I am working in the instruction sheet. It does involve similar cutting but slightly different. It's not 2x the GMPP because this Aux (15.5") unit isn't as long as the combo cooler (19.5") The surface are is 1.5 x or 50% more and if you follow through with the deflector modification and lower venting the rating will be much higher than not. You will re-route the existing hose from the oil cooler to the Aux. We will supply a new longer hose to go from the oil cooler to the Aux. No restricting steel lines.

Originally Posted by X25

Just ordered one (C7AUX)! Looking forward to seeing how it works out.

Since you're still writing the instructions, I presume it will take some time to ship?

Originally Posted by Pluggzz

I ordered on Tuesday...any idea on eta for the TC combo? Thanks!

Originally Posted by X25

I should also note, I'd be worried about adding those cutouts, since they'll reduce the flow to the main radiator, etc. I'm just not sure if it'd be a good change or not. Please tell me if I'm thinking wrong : )