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Old 10-30-2010, 04:40 PM   #1
relliMmoT
Scooby Specialist
 
Member#: 206931
Join Date: Mar 2009
Chapter/Region: South East
Location: New Orleans, Louisiana
Vehicle:
2004 WRX Wagon
6MT JBP 318WHP//300WTQ

Default Which clutch fork to use? Theyre different! (Pics) (04WRX to JDM STi V3 Trans Swap)

So im swapping from my 04WRX 5-speed to a JDM VIII STi 5-speed, Everything looks about the same or close to it as far as parts and matching up, however the clutch fork is slightly different.

-The 04WRX clutch fork has longer teeth, on the flat faced side of the teeth its about 20mm in length.
-The STiVIII has shorter teeth, 13mm in length..
-A difference of 7mm, which could mean a big deal for reasons I havent figured out yet.

-The 04WRX clutch fork teeth on the rounded wedged side are about 24mm in length
-The STiVIII are about 20mm in length on the rounded wedged side.

The release bearings are identical BTW. Visually and with calipers they measure identical.

The 04WRX fork has a big 'B' on one side and K5 3211 on the other side
The STiVIII fork has a big 'A' on one side and K4 7913 on the other side

STiVIII on left, WRX on right:



STiVIII on left, WRX on right:



WRX on left (curved end near slave cylinder hole), STiVIII on right (squared end near slave cylinder hole):


Please reply if you have any experience with any swap similar to this!
Im going to hold off on throwing the tranny in for a little while but by the afternoon if nobody chimes in im going to throw the WRX one in.

Thanks in advance!
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Old 10-30-2010, 07:29 PM   #2
Jaxx
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Member#: 177
Join Date: Aug 1999
Chapter/Region: NWIC
Location: Boise,Idaho,USA
Vehicle:
The 93 Imp W/EJ20K
flat black

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match it to the transmission
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Old 10-30-2010, 08:32 PM   #3
relliMmoT
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Member#: 206931
Join Date: Mar 2009
Chapter/Region: South East
Location: New Orleans, Louisiana
Vehicle:
2004 WRX Wagon
6MT JBP 318WHP//300WTQ

Default

Thanks for the reply! However its already installed :O . I just tightened up the bolts. Ill report back in the case of tragic failure.

I feel uneasy about this whole 4 bolt mounting system the new trans has! I guess if Subaru said it was OK then im okay with it... Sortve.
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Old 10-31-2010, 09:20 AM   #4
Jaxx
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The 93 Imp W/EJ20K
flat black

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the weak point is still the case (flex) i have never heard of a mount failure
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Old 10-31-2010, 02:37 PM   #5
relliMmoT
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Member#: 206931
Join Date: Mar 2009
Chapter/Region: South East
Location: New Orleans, Louisiana
Vehicle:
2004 WRX Wagon
6MT JBP 318WHP//300WTQ

Default

Yes, thats what I was talking about, mounting to the engine- sry.

Its two long bolts on top, one being the top starter bolt
The bottom starter bolt is now a stud that comes out of the trans.
In the middle, instead of the two shorter bolts on each side there is just a male nub in the middle of the two (same as on the WRX trans but a little longer).
On the bottom your still using the studs that come out of the bottom of the engine.

So the things that are different are the bottom starter bolt is now a rod, and the four bolts on the sides are gone..

I snapped a photo before I mounted it up..


I like the little center diff window on the VIII STi trans

Im assuming this is where a DCCD controller would go or something?

By the way I drove it last night, I had no problems with the clutch fork, I used the WRX one.. Sortve came to the conclusion that its just an updated design because the old ones teeth may have just been too short, maybe they could've had a problem with the teeth slipping out of the release bearing who knows...
On other notes, OMFG I sware ive pulled at least a half second off my quarter time, it feels like mid/low 12's now. It just PULLS. Unabomber has calculated something like a 13% increase in acceleration switching to a 4.444:1 ratio on one of his old posts i saw if im not mistaken- its TRUE, if not more than that.
The highway RPMs arent really THAT much to worry about, they are higher but not enough to KILL your gas mileage.
On modest launches (3-4k RPM) the car no longer falls flat on its face with turbo lag but just gets up and GOES.
And I can only get it up to 135MPH now.

Yeah I did all that an hour after I got it put together, who needs break-in right?
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