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Old 06-16-2003, 01:10 PM   #1
superg
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Member#: 3385
Join Date: Dec 2000
Location: Golden, CO
Vehicle:
2002 WRX
WRB

Default Close ratio STi type RA gear set and 4.44

A quick review of the close ratio RA STi gear set and 4.44 conversion. Rallispec sourced the gear set and did the 4.44 conversion through a core exchange of my r160. Bret Carter at Flatirons did a magnificent job with the install. Observations after some fun in the canyons west of Boulder:

- This is an outstanding improvement over the stock gearbox. The ratios put you smack in the middle of the torque hump on each shift. Instead of the descending rpm, descending push from each gear, now each the engine is in the same rev range and the acceleration is much stronger. It makes a remarkable difference on twisty mountain roads. You just never get caught in a hole" like you do with the wide ratios of the stock box.

The shift pattern is a bit closer than stock. It takes some practice and muscle memory to avoid over-reaching from 2nd to 5th instead of 3rd.

On the ride home on interstate, enjoyed the immediacy of 4th and 5th and didn't miss the stock 5th cruising/downhill gear at all. If your "special stages" involve lots of flat interstate, you might think it is too short.

BTW, installed an MRT downpipe/midpipe and hi flow cat at same time. Nice improvement, but overshadowed by the gearing improvement. STill, the exhaust really bellows in the canyons!

Superg
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Old 06-16-2003, 01:41 PM   #2
GreenMarine
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Chapter/Region: South East
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That's pretty cool..... Maybe you can help me answer my tranny questiuon that I have about the 5MT from 2003 and 2002....
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Old 06-16-2003, 02:22 PM   #3
bemani
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Member#: 5673
Join Date: Apr 2001
Location: Folsom, CA
Vehicle:
2002 WRX/2005 LGT
09 Ducati M696/ZX6R

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Are you reusing the old synchro?
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Old 06-16-2003, 05:14 PM   #4
superg
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2002 WRX
WRB

Default Synchros

Synchros were replaced on warranty about a month ago due to 2nd-1st synchro gone (no longer able to downshift while moving, even with double-cluth, rev-match).

Superg
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Old 06-18-2003, 01:12 AM   #5
bemani
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2002 WRX/2005 LGT
09 Ducati M696/ZX6R

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So you're pratically using brand new synchros. Nice timing
How much did your mileage got worsen by?

I was thinking of doing just the 4.44 conversion so the ratio would be the same as JDM WRX, but that doesn't seem too cost effective since I'll have to pay someone to open up the tranny anyway, but replacing the gears would be around $2k more, which I don't want to spend the moeny for
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Old 06-18-2003, 03:56 PM   #6
virpacalis
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Chapter/Region: Tri-State
Location: near Philly
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'07 STI
in the slow lane

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superg: What rpm do you have at 80 mph in 5th?
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Old 06-19-2003, 01:49 AM   #7
mojo
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Location: SF, CA
Vehicle:
2002 WRX Wagon
Silver

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Hey Superg:

I've been considering the STI RA gears at 3.9 or 4.44 on a similarly modded WRX. Glad to finally see someone do it with a 4.44 and post results. I'd assume an 80 mph freeway cruise between 4000-4500 rpms? Sounds like some $$ saved by changing out the internals of your regular rear diff versus a new rear diff? How much did this project cost, realizing your cost might not be mine? What was the down-time? Any need to change transfer gears? PM me if you don't want to post specifics to the board--and if you might entertain another question or two. Thanks for any help.

John
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