0Fasterproms

Hello I am in Fl and its hot as hades here. I have been doing some HPDE and seen a max 225deg F coolant and 265deg F oil temp. I have the stk radiator and oil cooler currently but have 160 stat and done other aero mods to help keep the car cool and venting air.
My questions are as follows:
1.)what should i expect to see in lower temps coolant and oil?

2.) Could I or should I still run the factory oil cooler as well as the dewitts with the oil cooler in it? would it keep the coolant cooler to get rid of the stk oil cooler?
I do like the idea of more oil in the system but what has been you guys experience?
Thank you all for reading and responding.
Jeremy Formato

CHJ In Virginia

The temps that you list are not really that high. I was getting over 235 deg on coolant and to 290 on engine oil temp at VIR with ambient air temp at 100 deg. My feeling is that if you are going to make the mods, go with the high capacity radiator and a separate external engine oil cooler for best performance. I have the DeWitts radiator and a DRM external oil cooler. At VIR in July this year 105 deg ambient temp, I saw a max of 218 on coolant (-17) and 262 on oil (-28). The cost is well worth it to insure longevity of the equipment.

svcjmo

I have installed 2 of Dewitt's radiators with tran/diff coolers in 2 c6Z's. First customer saw 215-222 coolant temps at Rd Atl on a 95 degree day.
You want a separate oil cooler.
I my race car I put in a Dewitts double 1.25" core with no trans/diff cooler and tested last week at Barber. 100 degree ambient temps. 500 rwhp. my coolant temps never got above 226 dgrees! I was very happy!

C5ZEE06

i have a Dewitts with integral engine oil cooler..wish i had gone with a separate / larger oil cooler. The EOC just isn't up to the Texas heat.

mfquinn

Not sure if the OP was asking this, but I would like to know. Can you run BOTH a Dewitts with integral engine oil cooler AS WELL AS an OEM Z06 oil cooler? This would give you more capacity of oil and two coolers for the oil.

0Tom@Dewitt

you can do that, I'd run to the external first and get out what you can there and then through the internal and back to the motor.

redtopz

I have been very happy with my DeWitt's radiator with EOC.

1991Z07

I would have thought you'd want to do exactly the opposite of that...

Use the radiator to cool the oil first, then the ambient air to bring it down further.

Otherwise, you'll never get the oil lower than the coolant temps...

Granted...you are putting a heavier load on the radiator. It's all inter-related.

0Fasterproms

Thank you all for your experiences. I did speak with someone from Dewitts the other day and they were very helpful. They had stated to run the oil thru the radiator first then the external and then back to the motor. It make sense to me I just want to make sure its right.
The radiator will help maintain the equilibrium better but for further cooling at a lower temp use the ambient air that should lower even more. right?
Thank you again
Jeremy Formato

waddisme

If you want more oil in system, just do the accusump thing. Not too expensive and good insurance. I put the DeWitts in my sc'd Z and never got above 190 at track, no matter the ambient (I am not counting the off track incident that ripped my front air dam off). When I went na, oil temps are always above 270*, but coolant still never gets above 198*. Good luck with it.

Gering

OP: Here is a good thread to read. http://forums.corvetteforum.com/c6-c...y-getting.html

Good Luck.

mcar00

I run the Dewitts without the internal oil cooler and use my stock external oil cooler. Seems to work pretty well. I run at Sebring and VIR in the summer. It's a high horsepower motor. My thought was that I want to focus on the water temp more than the oil temp becuase the tunes usually start pulling power based on the water temp. This is your territory though. What do you think?

AU N EGL

Stock Radiator ( for now ) Coolant temps 225-235*

Setrab external Oil cooler and 3qt accu-sump. Oil temps never above 250* ( manual switch )

Setrab external trans cooler

Stock t-stat.

One of the biggest changes to oil and coolant temps I found was to clean out the radiator fins right before EACH EVENT.

Part of the oiling issues is just not the cooling temps, but the long hard high-G left hand sweeping corners. Which can push the oil away from the oil pick up in the pan.

or with LS2 and LS3 engines, hard hard high G braking, which can keep too much oil in the heads as well. Again no oil to the pick up in the pan.

We have a whole thread on LS3s and dry sumps in road racing / track days.

One of the top competitors and forum contributor, IIRC blew three LS3 engines in a week do oiling issues. And cooling had nothing to do with it. But high G corners and High G braking.

So oiling issues in the LS engines are just not about cooling.

Zenak

Did you read about it all here:

http://forums.corvetteforum.com/auto...e-learned.html

0Fasterproms

Thank you guys. Just wanted to revive this and share my feedback. First event since we put the Dewitts radiator in. Temps were 225* Coolant and now 210* (-15) and the oil was 265* now 235* (-30). Right in line with others' experiences.
Thank you again
Jeremy Formato

ZedO6

Are you running the internal EOC in the DeWitts and the stock Z06 engine oil cooler in tandem or just the EOC in the DeWitts?

0Fasterproms

running in tandem. It takes much longer to get to operating temp over 120*+ but If I do one cooldown lap it will drop 20*. In short much better regulation of oil temp.
Jeremy