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Old 09-20-2018, 12:13 PM   #1
Scooby Newbie
Member#: 126879
Join Date: Sep 2006
Chapter/Region: E. Canada
Location: Toronto
2004 WRX

Default 2004 WRX: Engine swap vs Transmission swap

I have a stage 2 2004 WRX, the power is plenty for daily driving, but the car feels lackluster on track, especially a tight track where the turbo barely spools up (if at all) before I arrive at the next corner. The car is not accelerating fast enough. 2nd gear is too much, 3rd gear feels like there is no power at all.

I have a strong feeling that my problem has more to do with the stupid grocery getter 5 speed transmission than then 2.0 litre engine. If I can only do one thing, what would make the biggest impact here? A STI 6 speed tranny swap or engine swap/bigger turbo?
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Old 09-20-2018, 12:38 PM   #2
Scooby Specialist
Member#: 175624
Join Date: Mar 2008
Chapter/Region: MWSOC
Location: Wichita, KS
0304 WRX WRX


The 6 speed gearing makes the 2L lot more fun even though it adds a bit of weight.

Bigger turbo will make the 5 speed seem worse due to added lag. 2.5L torque would probably help, but I went the 6 speed route myself after switching to a 16G.
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Old 09-20-2018, 04:18 PM   #3
Scooby Specialist
Member#: 395793
Join Date: Jul 2014
Chapter/Region: Tri-State
2005 92x Aero


The 4.44 5 speed I swapped into mine is much more lively. I've been told the gearing in this is very similar to gears 1-5 on the 6 speed. I'd go trans swap personally. Getting a VF34 in this coming week and will give my thoughts on gearing and slightly bigger turbo if you're interested. Can't wait to track it in the spring with a couple other mods.
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