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Old 09-04-2003, 02:02 PM   #1
MZM
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Member#: 514
Join Date: Nov 1999
Chapter/Region: SCIC
Location: San Diego
Vehicle:
07 Legacy Spec B
Impreza 93 STI

Default Which clutch/pressure plate?

In the interest of expense and availability (I already had the tranz ) I am using a push style clutch with a EJ20 turbo engine. The stock Suby push clutch/pressure plate is of course not up to the power of the motor and will slip when accelerating hard from a stop or downshifting/accelerating out of a turn.

My question is what is a good stronger aftermarket push style clutch to use? I understand the turbo motor pull clutch but that isn't going to happen this year. Anybody with a recommendation and maybe a web source would be appreciated.

Mikw McBride
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Old 09-07-2003, 08:41 AM   #2
JSiwek
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Well all clutches made for a 2.5 tranny are push style. So any aftermarket clutch for a 2.5 liter Subaru will work for you. I would recommend Clutch Masters Stage III for a strong but very gentle and streetable clutch, or an ACT heavy duty street one for more of the instant engagement neck-snapping style and heavier pedal pressure. I'm assuming that you have a 2.5 flywheel on the EJ20 as well correct?

In order to switch to a pull style you would need to switch transmissions as well... a WRX clutch wont bolt up to a non-turbo tranny. If you went there, you'd need a new tranny, flywheel, clutch obviously, and slave cylinder.
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Old 09-07-2003, 01:45 PM   #3
MZM
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Join Date: Nov 1999
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07 Legacy Spec B
Impreza 93 STI

Default Pull clutch tranz case

JSiwek replies:

Quote:
In order to switch to a pull style you would need to switch transmissions as well... a WRX clutch wont bolt up to a non-turbo tranny. If you went there, you'd need a new tranny, flywheel, clutch obviously, and slave cylinder.
First, thanks for your reply. I will look at the clutch kits you recommend. What I would like to get is a stronger clutch/pressure plate kit to hold the turbo torque (about 280 ft-lbs) but not so strong as to stress the gears in the box enough to break. And of course world peace and a good $5 haircut.

Second, it looks like the tranz cases for either push or pull style clutchs are the same except the push type uses a post for the fork to pivot from and the pull uses a large pin for the fork to rotate about. There is the same configuration and spacing on both cases.

So, it might be a silly question, but why can't a pin be installed in the push type case instead of the post used for the push fork? I have never seen a turbo pull tranz case, so I don't know.

That way, one would not need a complete tranz, only the pull fork with its attendant pin, etc. to go with the better turbo clutches.

Or, with the aftermarket push types you mention, is it even necessary to move to the turbo pull style clutch? What do you think?

Mike M
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Old 09-07-2003, 02:05 PM   #4
Soon2Bgreat
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1999 gc8 ver7 6mt
GT35R 504.7whp;)

Default

I would go with a 4puck clutch and maybe a 6puck as opposed to an organic disk. I drove my turbo RS and then sti swap for about a year and my ACT street just fried. Although i was by no means gentle as i often went to the track and launched the car hard with maybe a good amount of slip as i was scared of hurting my tranny. Nonetheless i think you'd be all right with a 4 or 6 puck so long as you keep it in the back of your mind that you should be gentle on the tranny. As far as converting to pull type, i've heard it can be done without a swap (tranny) but why would you spend money to convert it just to get pull type clutches. They are just as expensive and the 2.5rs clutches are adequete. I believe Pat richards was using a 4puck primitive clutch on his rally car with good success until he recently switched his tranny i think. Just throwing my 2cents in, sorry that was a little long winded. Good luck.
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Old 09-07-2003, 08:23 PM   #5
JSiwek
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Yeah there's no advantage whatsoever moving to a pull style clutch. I wouldn't worry about changing parts around to go that way.

I ran a Clutch Masters stage III on my engine swap with a lightweight flywheel and it had way more than enough holding capacity but it's still very streetable... even nicer than stock. It's also Kevlar, so it will last a very, very long time. I went through an ACT organic one as well, but I really feel the Clutch Masters will last forever. When I took it out of the car and looked at it after having driven on it for almost 10,000 miles it looked brand new.

A copper puck clutch disk isn't going to be forgiving at all and will also be really tough on your flywheel... but if you're doing a lot of drag racing as Soon2Bgreat is and not a lot of daily driving it's probably a good way to go.

Jeremy
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