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Old 07-20-2005, 02:04 AM   #1
powerlabs
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Default 300+HP JDM Swap: My clutch is toast, tranny is next. Some advice please?

After swapping out my stock EJ25 for a V5 JDM WRX Type RA engine, I have noticed that as soon as my engine comes under full boost (18+ PSI ) in 5th gear, the clutch will INSTANTLY slip. Today I did a couple runs and it got to the point where the clutch would slip to redline. I am currently using an Exedy organic clutch and the stock transmission with an ACT 13 pound flywheel. My transmission has also broken twice with the stock engine, so I suspect it won't be long untill it happens again with over 300HP on tap.
It is clear that I need a new clutch, and with a new clutch I will need better gears. I have a complete 3 puck ceramic clutch that came with the swap for free, and I could get a JDM STI V2 5 speed transmission for $1700 dollars.
OR, I could get an RA (or some other brand) gearset, but then I would also need a new clutch.
What do you guys recommend? I hear the JDM transmissions are stronger, but if I could get an upgraded gearset strong enough for my engine + a good clutch for less than the price of the JDM STI tranny that might be a better option.
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Old 08-01-2005, 11:43 AM   #2
supermoose
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sti v2 gearbox is the bomb. just drove it. its the BOMB. DCCD if u have an RA one.
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Old 08-02-2005, 01:37 AM   #3
powerlabs
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No DCCD in V2....
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Old 08-03-2005, 11:04 AM   #4
supermoose
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mine has one. RA has dccd.
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Old 08-03-2005, 12:50 PM   #5
electricpork
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[quick hijack] did the RA gearbox ever come with a 4.11 rear end or only 4.44? /hijack
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Old 08-03-2005, 09:27 PM   #6
Z1 Performance
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old RA's have 4.11 (V3 and earlier as I recall). I had an Sti V3 trans in my old GC8, with the Exedy Sport clutch and STi flywheel and car running high 11's, never had a clutch issue
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Old 08-03-2005, 09:33 PM   #7
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exedy twin plate
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Old 08-04-2005, 07:43 PM   #8
supermoose
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a stock wrx clutch should be good to ~350 ps. my stock Sti one is great, my RA 2 and your RA 6 probably make pretty close power. you make more, but not that much more to kill a stock clutch. you have a NA clutch though, so perhaps an uprated one is in the ordering..
or go turbo gearbox and get a clutch with it
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Old 08-05-2005, 02:23 AM   #9
electricpork
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Quote:
Originally Posted by Z1 Performance
old RA's have 4.11 (V3 and earlier as I recall). I had an Sti V3 trans in my old GC8, with the Exedy Sport clutch and STi flywheel and car running high 11's, never had a clutch issue
Thanks. After doing some looking around, the 4.11s were available on old, pre STi WRX RAs. makes for a sickeningly short gearbox. They weren't kidding about "rally application."
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Old 08-06-2005, 01:16 AM   #10
roboace
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big thing with JDM, is the question, "is ti still good". you don't know what your getting some times, but most of the time you do. I went on the safe side. what i did was swap out my stock 1st and 2nd gear with brand new JDM RA ones. this gives me the strength where i need it and i didn't have to worry about having problems with the 4.44 final drive raito and rear diff. i was also given the option to harden my 3rd, 4th, and 5th gear with a cryo treatment, but didn't have the time to wait for that to be done. (this is after waiting for a full month already to get the car back) so i opted out and went with a light weight flywheel that will help in not trashing the other three gear. when i got it back i was veeerrrryyyy pleased, along with a longer 1st and 2nd gear (35mph @ redline on 2.5NA motor and 55mph at redline for second gear) i also got a first gear synrco and lots of new parts in the case as well. the light weight flywheel help very much too, i am confident that i won't ever trash this tranny because the gear set is so nice and the tranny was like brand new, excsuee my horrid use of like. so in concluson, try and do what i did, i think it works out the best.

ACE

P.S. i know i am a bad speller
hookt on fonix reely werkt fer me!
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