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Old 10-23-2007, 05:58 PM   #1
Scooby Newbie
Member#: 124232
Join Date: Aug 2006
Chapter/Region: Tri-State
Location: Westchester, NY
2005 wrx

Default Bigger TMIC with open source tuning

Does anyone know if it's alright to put a much bigger intercooler (like the ebay one) on an 05 wrx that has an open source stage 2 map for EM? Pros/Cons...Thanks.
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Old 10-23-2007, 06:21 PM   #2
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Member#: 143287
Join Date: Mar 2007
Chapter/Region: Tri-State
Location: Upstate, Ny
02 Wrx wagon
WRB, stage 2 and a bit


I believe it to be alright. A good source for info like that is enginuity.org forums. I think that they refer to it as a stage 2.5 upgrade and you will need a retune. The car will build boost beyond what you have it set to now only because of cooler and denser air coming in. Also winter is right around the corner so you may see a 1 to 2 pound boost fluctuation. Good if your car is ready for it.....bad if it isn't.
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Old 10-23-2007, 06:29 PM   #3
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Chapter/Region: NWIC
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98 2.5 RS
04 WRX


As was stated, the bigger TMICs flow a bit better than stock. That means the turbo can work at a lower pressure ratio for a given boost at the manifold, the wastegate tables will need to be adjusted to compensate.

Other than possible overboosting, it should be fine. The better cooling should allow you to run more boost, leaner afr, or more timing over the Stage 2 map you are currently running.
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Old 10-23-2007, 06:38 PM   #4
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Location: San Antonio
2003 WRX IdleWagon
1992 GVR4 379/1000


I don't see major adjustments needed unless you went with a FMIC. Probably just adjust the WGDC/Continuous/Burst a bit if it's oscillating, and boost table if your running alot more (3-4 PSI) boost than before but hitting target and it is steady.

If Boost goes up by 1 PSI or so, but the dynamics stay the same, I'd say it's probably fine and just a result of less pressure drop.

I just put an STI TM on my car today and will be doing some tuning with it tomorrow. I'll let you know if I change anything.

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Old 10-23-2007, 07:31 PM   #5
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Chapter/Region: Tri-State
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2005 wrx


Thanx guys,

I was thinking about it because I know people put bigger intercoolers on their stock cars without even having a tune plus everyone says they work fine with Cobb Stage 2...
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Old 10-24-2007, 09:37 PM   #6
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Chapter/Region: South East
Location: Atlanta, GA

The difference between the stocker and the majority of bar and plate designs (like the majority of the ebay ones) is that there is a .2 psi pressure drop vs a 2-3 psi pressure drop on the stock intercooler. What this means is you can realistically run 2-3 psi more boost and the turbo is in the same range as it was before since it is not having to work as hard. This means the ability to run more boost while keeping the turbo in its efficiency range. The difference in cooling is going to be minimal until you go to a front mount. So, as others have said, adjust wgdc and MAYBE turbo dynamics.
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Old 10-24-2007, 11:55 PM   #7
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Chapter/Region: MAIC
Location: NOVA
2003 WRX


I'm assuming going from a WRX to STI intercooler is why I started to overshoot my boost target. I adjusted the TD table to lower the speed that boost increases. I also notice in the logs I don't need nearly as much WDGC as the Stock ECU had dialed in to make target boost.
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