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Old 10-10-2005, 09:51 AM   #1
Bayley
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Default STi 6 speed into WRX swap – clutch options?

I’m in the process of investigating a DIY 2004 USDM STi 6 speed swap into a 2004 standard WRX. It appears that there are two different clutch part numbers for these two parts. Does the 6 speed have a different input shaft where the splines or needle bearing do not line up, or is the difference only due to the different flywheel and / or increased performance over the stock WRX clutch?

I’ve got a nice clutch setup for my (now trashed) 5 speed and would hate to spend (even more) money on a clutch that I might not need to buy.

Thanks.
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Old 10-10-2005, 11:15 AM   #2
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yes you need a 6 speed flywheel and clutch ..
they are differnt
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Old 10-10-2005, 04:59 PM   #3
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How are they different?
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Old 10-10-2005, 05:08 PM   #4
moss
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Ones for a 6spd and ones for a 5spd....

You want the logistics behind it? You can't use a 5spd clutch with a 6spd transmission.
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Old 10-11-2005, 12:28 AM   #5
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Quote:
Originally Posted by moss
You want the logistics behind it?
Yes! Where did you get your data... or is this just something you pulled from another thread?



P.S. Upon further investigation, it appears that the clutch from my 5 speed WILL WORK JUST FINE infront of a 6 speed. I would quote my sources, but it appears that I don't need to around here.
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Old 10-11-2005, 12:58 AM   #6
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Sorry, I've gone with what I've heard, stupid me. I admit fault.

research indicates 5spd clutch will work with 6spd tranny. However you must use 5spd flywheel as well... Issues that arise with not using the 6spd clutch and flywheel with the 6spd tranny is loss of surface area and efficency.

Also, you may have to use the 5spd starter versus the 6spd starter.

Also, the swap is not backwards compatible. 6spd clutch/fly with 5spd tranny. The 6spd clutch/flywheel is about 1mm or so larger.

http://forums.nasioc.com/forums/sear...archid=2843993


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Old 10-11-2005, 02:57 AM   #7
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5 speed clutches WILL work with a 6 speed transmission, you can not use a 6 speed clutch with a 5 speed transmission.

The 6 speed clutch is larger diameter then the 5speed clutch.

there is no difference between the starter on a 6mt and the starter on the 5mt.

and yes i have done 6 of these swaps personally
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Old 10-11-2005, 10:39 AM   #8
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People have run the 6mt clutch/flywheel in 5mt trannies also. Mikaust and Dug-E-Fresh are doing this. You have to machine out the bellhousing a bit. It's apparently not difficult and works quite well. I'd contact them to find out more information about it, as i have no first hand knowledge sorry. Good luck.

Louis
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Old 10-11-2005, 12:21 PM   #9
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Thanks for the info guys.
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Old 10-11-2005, 01:04 PM   #10
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Quote:
Originally Posted by dentsport
People have run the 6mt clutch/flywheel in 5mt trannies also. Mikaust and Dug-E-Fresh are doing this. You have to machine out the bellhousing a bit. It's apparently not difficult and works quite well. I'd contact them to find out more information about it, as i have no first hand knowledge sorry. Good luck.

Louis
that's right i forgot all you have to do is cut out a section of the housing, i should have stated that
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Old 03-28-2014, 10:13 PM   #11
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I'd like to see some resources involving the whole 5spd clutch with 6spd trans please! i'm gathering the resources now to do it myself.
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Old 03-29-2014, 10:21 AM   #12
David WRX
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i was thinking of doing this swap on my Eagle eye. but i wanted to know should i go ahead and put PPG stright cut gears in it, and which flywheel and clutch kit should i do. so i am in the same boat
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Old 03-30-2014, 01:08 PM   #13
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Quote:
Originally Posted by mousecop View Post
I'd like to see some resources involving the whole 5spd clutch with 6spd trans please! i'm gathering the resources now to do it myself.
It just fits. No changes needed.

Disregard the 10 year old info in this thread, 6 speeds were new then and people were still learning.
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Old 03-30-2014, 02:02 PM   #14
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Quote:
Originally Posted by David WRX View Post
i was thinking of doing this swap on my Eagle eye. but i wanted to know should i go ahead and put PPG stright cut gears in it, and which flywheel and clutch kit should i do. so i am in the same boat
The STi 6MT is more gearbox than you'll need, probably ever. NO need to spend $4k on noisy PPGs 1-4.

Find your STi 6MT, DCCD, axles and clutch to match and be happy!
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