V4kerker

I'm getting ready to upgrade to a Dewitts or Ron Davis radiator with EOC/TOC, putting in a 160 or 180 T-stat also. Is this enough cooling for the engine oil for HPDE duty? Do I need to add an external cooler also?

My C6 A6 is bone stock right now but I'm going to do some bolt on mods and maybe H/C also.

I want to do it right the first time.

Thanks Kurt

ErnieN85

Yes either will do it although you probably could use a extra Transmission cooler too

MarkDFW

I'm interested in feedback on this also. My oil temp hit 290 at the end of my HPDE sessions. I don't have a dry sump and seeing 290 scares me. I already have a tranny cooler. I will definitely get an oil cooler and maybe new radiator as well.

V4kerker

Sounds good ErieN85. My trans temps are staying under 240 and I'm ok with that. I could maybe use a differential cooler also, but not worried about it.

BERETTA

Either one of those will do the job for you. I run the Ron Davis from Doug Rippie with the built in oil cooler. 45 minute races in 95 degree heat I see a maximum of about 260 on oil temp.
I have a couple friends that went with the dewitts, they do HPDE's only they are also in the 250-260 range depending on how hard you run the car..

V4kerker

MarkDFW I see in your profile your running a 160 T-stat. And your still hitting 190 EOT? I'm hitting 280-290 range about 15 minutes into a fast HPDE session. Than I have to back off for a couple of laps to cool down and get back on it for a few more hot laps.

I've learned in my first year of HPDEing the faster you get the hotter things get.

MarkDFW

Yes my engine oil temp hit 290 at the end of a 20 minute session and it wasn't even a hot Texas day. 160 thermo has the engine temp at about 178 when cruising on the highway vs stock thermo which I believe is 197. Once you are hammering the car on the track, you can kiss 178 engine and 220 oil temps goodbye!

0Tom@Dewitt

15% discount this weekend

http://forums.corvetteforum.com/c6-p...iday-sale.html

Z06trackman

In a word: No. If you want to do it right the first time, you need a big plate type stand alone engine cooler. You can only count on a 20F drop with the internal cooler, but with a stand alone you can expect 40 - 60F. I can't speak to the auto trans, but I required a DRM unit in the rear fender to cool my manual.

Grabbed_Crow_Mobe

I agree.

mountainbiker2

Here's a picture of a DeWitts compared to a stock radiator.


Steve A.

1ED1

Stand alone coolers are best.

V4kerker

Z06trackman the hottest my auto TO gets is about 240F. I run in sport mode. I think that temp may come down a little with a 160/180 T-stat.
I think I'm leaning towards the RAD with a EOC/TOC because I maybe adding a intercooler for a FI unit I might be installing also. I'm not sure if I'd be able to fit all those coolers up front?
I know I don't need the extra HP but I've got an itch thats driving me crazy

V4kerker

Like they say Biggers better.

V4kerker

Tom which model radiator is for a 2007 C6 A6 with EOC/TOC? Model 1139105B says 05-06 not 07. Model 1139105A doesn't say EOC/TOC. And I'm guessing I'd need a left side hose kit also?

Thanks

rfn026

I've been working on a new article for Vintage Motorsport magazine that deals with cooling systems. The ideal temperature for a race car (and maybe a track car) is between 210 and 220. You get a little more power at 240 but the risk is greater if you run that high.

If you run a 15 lb cap your boiling point is around 250. Antifreeze boils at around 387 degrees so adding a 50/50 mixture will raise your boiling point even higher. Also most antifreeze contains a surfactant.

btw - Water Wetter and Below 40 are both surfactants. If you're running a 50/50 mix in your cooling system you won't see a big change in temperature because you already have surfactant in the systems.

Also, DeWitt is adamant that you should only use distilled water in your cooling system. Tap water is a huge variable. Just buy the good stuff.

The article should be out in a few months and you'll be able to get it at Barnes and Noble.

Richard Newton
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0Tom@Dewitt

You can use the 1139105B for 07, we don't list it that way because GM didn't offer it with both internal coolers in 2007. The hose kit would be under accessories

Z06trackman

The thermostat temp rating will not affect temps while running on the track. The thermostat is simply a valve that allows your engine to maintain a minimum temp while operating under a light load. Under heavy load it is open and therefore its opening temp is irrelevant. Also, if you add power you will be adding waste heat so the need for bigger/more efficient water and oil heat removal (cooling) will only increase from where you are now. This is true for both your engine and your entire drive line. You asked what it takes to do it right the first time and you got the answer.

crimlwC6

Be sure you ground the radiator to prevent electrolysis. If you don't, you can end up with a very pretty looking radiator that has a million holes in it.

crimlwC6

If you get a EOC and in the future need more you can always use the EOC for power steering and get dedicated coolers down the road. However, I would just go ahead and get a dedicated oil cooler now. 2 cents.