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Old 01-28-2006, 09:18 AM   #1
2slofouru
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Default which clutch to use with 1.8L 5spd and 2.5 engine?

I have the 5spd from a 96L and want to put a stock replacement type that will work for the 2.5 without slipping. Should I just use a new 1.8 clutch or will I have to change the flywheel and use a 2.5 clutch? The transmission also has the cheesy cable clutch. I'd like to change it to hydraulic but I'm not sure if it's worth the trouble. Ideas anyone? I don't want to buy another transmission.
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Old 01-28-2006, 10:17 AM   #2
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If its AWD, you can use any push type clutch.. ie. 1.8awd, 2.2awd, or 2.5rs

If its FWD, you have to use the 1.8 fwd clutch. The input shaft on the fwd tranny is smaller than the awd trannies, therefore you can't use the awd clutch.. Believe me, thats what i was gonna do, till i found out you couldn't.
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Old 01-28-2006, 11:57 PM   #3
2slofouru
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So:
-I can change it from cable to hydraulic
-I can use a 2.5 clutch on the 1.8 flywheel
The transmission I am putting in is a 5spd awd.
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Old 01-29-2006, 12:02 AM   #4
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i'm not positive if the 1.8 flywheel will work with the 2.5 clutch.

Do some digging through the tranny forum, it should be there somewhere.
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Old 01-29-2006, 06:08 AM   #5
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use 2.5L fly with AWD 2.5L clutch. theres however a good chance a 1.8L fly is same bolt pattern diameter and probably is lighter.
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Old 01-29-2006, 09:12 AM   #6
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If you use an AWD clutch, you need to use an AWD flywheel. So if your 1.8 flywheel is AWD, then you can use it. The FWD and AWD pressure plates use a slightly different bolt pattern on the flywheel, but the size and mass of the flywheel are the same.
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Old 02-02-2006, 06:50 PM   #7
2slofouru
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So I should be able to use the 1.8L awd flywheel and just buy a 2.5L clutch? Is there a certain car I can get the hydraulic master and slave cylinder from that will bolt onto the 1.8L awd transmission? Thanks for the info.
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Old 02-02-2006, 07:37 PM   #8
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Don't bother changing to a hydraulic clutch. The cable works fine and will ensure you don't have issues with shudder. Plus, you won't have to change pedal assemblies and go through the work and expense involved with all that. You can use a stock RS clutch setup or stage1 if you feel like it. I can't confirm the same bolt pattern on the 1.8 flywheel for the RS clutch. I swapped out to a light flywheel at the same time as my motorswap.

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Old 02-02-2006, 10:33 PM   #9
2slofouru
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I guess I'll use the 1.8 flywheel then. I checked on advance auto parts' website and the beck/arlney clutch part numbers are the same for the 1.8, 2.2, and 2.5, and the spline count and clutch disc diameter are all 8 and 7/8. So that means they all have the same clamping force and any one should be sufficient for the 2.5 engine as long as it's an awd clutch set?
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Old 02-02-2006, 11:33 PM   #10
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I love my cable clutch and so do all the WRX owners who drive it. You will see the 1.8L AWD tranny has the same part numbers (aftermarket) as the 2.5RS...

do an ACT lightweight flywheel while you're in there...trust me...they're cheap too...
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Old 02-03-2006, 12:07 AM   #11
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You're safe with the flywheel as long as it's an AWD flywheel. There's no difference between those N/A AWD flywheels.
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Old 03-23-2006, 11:47 PM   #12
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Sorry for the noob/hijacking, but would an sti clutch work with a 1.8 awd?
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Old 03-24-2006, 08:33 AM   #13
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Not without changing the clutch actuation to pull type instead of push type. There isn't much reason to use an STi clutch with the amount of aftermarket clutches available to the RS crowd.
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