Engine/Power - EJ25T (STI and 2006+ WRX) Discussions about the USDM 2006+ WRX and WRX STi 2.5 liter turbo flat-four.

Oil Cooler and Tranny Cooler

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Old Sep 29, 2005 | 09:17 PM
  #1  
depdivr's Avatar
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From: Moved to Portland, OR
Car Info: 2005 Black WRX STI
Oil Cooler and Tranny Cooler

Hi all,
I am getting an Oil Cooler, after I installed the FP Red my oil temps jumped from 210 to 230 under hard driving. I think that an oil cooler will drop it into the low 200's again.

Question for you all, does anyone run with a tranny oil cooler? Has anyone had any thermo induced transmission failures?

I am driving an 05 STI with the following mods:

Full race exhaust - headers, up, down pipes, 3" exhaust.

Fuel System - 816 cc injectors, walbro 255 l/hr, fuel rails, fuel pressure reg (43 psi), stainless lines.

Perrin Big MAF intake, Perrin FMIC, FP Red Turbo

Tein Flex with EDFC.

Currently running ECU-Tek reflash map with 93 octane, netting 360 whp and 338 ftlbs torque.

I am trying to get this car to be top notch at the track.
Old Sep 29, 2005 | 10:06 PM
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Car Info: 02 Black Legacy GT
I would not worry about tranny cooler unless your car sees some serios track time. And by serious, I mean like enduro type of stuff. Oil ooler is a great idea and I recommend the TRUST unit.
Old Sep 29, 2005 | 10:52 PM
  #3  
depdivr's Avatar
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Posts: 376
From: Moved to Portland, OR
Car Info: 2005 Black WRX STI
Originally Posted by Imprezer
I would not worry about tranny cooler unless your car sees some serios track time. And by serious, I mean like enduro type of stuff. Oil ooler is a great idea and I recommend the TRUST unit.
Ok, I appreciate it.

That seams to be the general consensus. Interesting though that the STI Spec C has both an Oil and Tranny cooler in the stock car. In the USDM STI, there is a oil line poised for the cooler but they just didn't include it!
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