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Old 12-06-2005, 09:40 AM   #1
Scooby Specialist
Member#: 26607
Join Date: Oct 2002
Location: socal
2002 wrx wagon

Default To those who upgraded their TMIC:Earlier turbo spool? Different spool characteristic?

Hi I was wondering if you guys who had upgraded their tmics from the wrx stocker to an aftermarket bar and plate tmic experienced faster and earlier spool? less turbo lag?

if so about how many rpms or what was your experience? I am more concerned about spooling characteristics than increase of power up top.

I am getting tuned w/ a vf28 and water/alky injection and am deciding whether or not to upgrade the stock tmic.

The only reason why I would upgrade to a bar and plate tmic is to spool earlier, less pressure drop....not lowering air temps since the alky injection should take care of that. I ran a search and found a few posts that mentioned that they encountered less lag but not much more info.

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Old 12-06-2005, 09:53 AM   #2
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Join Date: Jun 2005
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2005 WRX


id also like to know
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Old 12-06-2005, 12:36 PM   #3
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03 wrx
blizzzack stage IV


I didnt really notice a difference in spool but i had a stock turbo at the time. just felt smoother and more consistant in the higher rpms.
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Old 12-06-2005, 08:31 PM   #4
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Location: 49 north
03 WRX, 02Forester


an issue of sport compact car magazine (2-3 years ago) dynoed various TMIC and actually found more lag ( torque curve shift to right) with a large TMIC ( forgot which brand )..

..but a scubie guru mentioned STI TMIC as insta spool..

need more input please !
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Old 12-07-2005, 12:26 AM   #5
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Chapter/Region: NESIC
Location: Griswold, CT
2014 Forester
Dark Grey Metallic


THe spool isn't such a big thing as it is the upgraded TMIC's ability to flow more CFM. I noticed a difference going from a stock WRX TMIC to a MRT. The design is much more efficient, so it lets the air into the engine in a bigger volume, but you also have to fill up that volume too. If you still have a stock turbo, it can rob you of a few HP/TQ on the dyno due to the amount of volume it now has to fill, and it doesn't have the lungs. On the other hand I have beat the panther piss out of my car on hot days and never seen it heat soaked after I get out of the car. I use water spray also. But since I have WI now I am probably going to get rid of my water spary setup.


If you are planning on eventually upgrading to a bigger turbo, and not going to a FMIC right away, a upgraded TMIC in place before the new turbo is a good thing.
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Old 12-07-2005, 02:14 AM   #6
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oh btw here is a really good read on intercooler design. The link is from unabomers tmic faq.


It took me like 30 mins to read everything........real good info though. some food for thought.
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Old 12-07-2005, 02:57 AM   #7
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2002 wrx wrb


I think the first post said it... less pressure drop.

differential pressure gauge is what you need to measure it. that info should be provided by the manu of the intercooler.
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