[Ironring Racing]

Doug is saying he'd like to hear from teams that have solved the issue. Berk hasn't.

And as posted, neither have I, with meth, 2 OC's, Helix FMIC, etc.

Slidewayz, gotta say I'm with Doug on this one. In my experience, the water temps aren't that much higher on the track than they are on the street. Say 100C street to 115 on the track.

Whereas the oil temps are up dramatically, 115C street to 150 track, and are what cause limp modes on the track.

Now the oil temps & resulting limp modes aren't the problem, they're the symptom, which "I think" is what you're trying to say.

But what Doug is saying is that the source of the energy (heat) in the oil could either be the engine or the turbo's.

From my experience with my water temps only rising 15C while my oil temps rise 35C, to me that would indicate it's not engine temps that's causing the issue, it's turbo heat.

This is in line with my experience of reducing boost having a reasonable effect on reducing oil temps. If I drop to 12psi, engine temps drop to 140C for almost an entire session; rather than 150 in 7 laps.

I'm not too worried about "fooling the interlock" as there is also cylinder head temp monitoring which effects the ECU safety protocols. That's what our German friend Prae mixed up (page 47).

So IF the heat is coming from the engine, and because of the higher heat transfer capacity of water the water temps only increase by 15 while oil increases by 35, it is possible that a larger rad, while maybe only reducing the water temps by 5C might make a multiplied effect on the oil temps reducing them by say 15. Which I would be overjoyed at!!!

But IF the majority of the heat in the oil is coming from the turbo's, not the engine, but since the turbos are dual water and oil cooled, the behavior we're seeing would only be true if either:

1. The heat transfer rate from the turbos to the oil is substantially greater than the heat transfer from the turbos to the water, so additional water cooling won't have a substantial effect, or
2. the oil cooling is so undersized for high HP heavy track use that even with 2 oil coolers it's not enough, and even more oil cooling, either via increased cooling surface or greater air velocity through the existing coolers is required.

I don't know, and can't wait to find out!

[zsapphire7]

Originally Posted by Ilma

http://www.e90post.com/forums/showthread.php?t=406402

Might want to look at this thread for some info.

Berk Technology track car running meth and upgraded oil cooler......almost going into limp mode due to high coolant temps.

Go figure!

Yes, Id like to see their oil temps data from that time. They didnt record it and "assumed" it would be 250-260F too but i kinda doubt that. I guess it depends on how much boost they were running.

[Kelvin1000]

I think figuring out a way to get more direct airflow is extremely important even when using upgraded oil coolers...