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I haven't paid attention to clutches in quite some time. I've always felt my ACT S/S clutch was barely adequate for 340whp, especially the last couple years since I have tires that can actually hook up.
Is there something you like can hold more HP than the ACT S/S but still be easily streetable?
thats the same clutch that was in my car when i bought it. it was dynoed at 390whp. it felt fine to me. i went ahead and replaced it anyway though. im using an os giken twin plate. its streetable and i enjoy it. it grabs like a twin plate should. the clutch pedal effort is MUCH higher than stock. it feels like the brake pedal now but i dont mind. i have an ogura single plate for sale if youre interested. no idea what its rated at but it looks like it would do more than the ACT.
We install a lot of Exedy Twin Disk clutches. We have also found that the ACT HDSS does not last very long in the mid 300's. The Exedy has a lighter pedal feel than the ACT HD. We do install the ACT monoloc wedge collar
I bought Petitt's Rally Clutch kit last year. The pedal feel is almost the same as the stock one. Before buying I asked them if this kit was suitable for a 350ish hp car and Cam told me they had been using it in their 500hp track car with no problems.
I bought Petitt's Rally Clutch kit last year. The pedal feel is almost the same as the stock one. Before buying I asked them if this kit was suitable for a 350ish hp car and Cam told me they had been using it in their 500hp track car with no problems.
can you point me to the right direction for that clutch kit ?
I assume it's everything I need when it comes to a new clutch job ? my clutch is slipping
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In my 300ftlbs FC I started with the ACT S/S
(Z65-HDSS), but it was a little slippy if I abused it some and couldn't handle real abuse.
I went to RB sprung 6 puck with that same S/S pressure plate (so, like (Z65-HDG6). Much better for abuse, still couldn't handle real abuse.
Then I went with the ACT extreme pressure plate and a new RB sprung 6 puck (so, like Z65-XTG6). This could handle all the abuse I heaped at it even when I went to 400ftlbs set-up.
No complaints aside from driveability/pedal effort on this set-up.
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I prefer the easier pedal and wider pedal range of partial engagement I got from the Exedy twin sprung 6 pucks in the FD versus the single sprung 6 pucks in the FC.
Cost aside, I would say Exedy ZM022SD is the best next step from the ACT S/S set-up (which is very close to stock).
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One could also do the extreme pressure plate with the full face disk as the next step from the ZX6-HDSS ACT S/S (so, ZX6-XTSS for the FD), but you still have the high pedal effort and the disk that can't handle real abuse (2nd gear launches, continuous no-lift shifting, clutch kicks, etc).
If you treat your FD like a lady and you like Left leg day in traffic, this is an option.
Lot's of twin disk clutches being used it sounds like, the only twin I ever drive was unsprung and very much on/off switch. I didn't care for that, how different is a sprung twin disk?
The Exedy sprung 6 puck twin has more partial engagement area than my ACT single sprung 6 puck, but a hair less than the ACT single full face (S/S) I used before.
But you don't feel bad (smell bad) using the partial engagement on the twin 6 puck like you do on the full face.
If you look at the Exedy link I posted they claim their larger partial engagement zone is because of their patented "Pull typle clutch cushioning function".
ACT ZX6XTSS which is the extreme version with a full face disk. We've run plenty of them over 500 wheel hp with no failures.
or the Z65-XTSS with the push style conversion. I don't think I will have any troubles up to 450hp. Not sure how much past that I am going to go with the 9.7 compression rotors.
We have had countless cars on our dyno making more than 350rwhp with ACT clutches, that does not mean that they last very long on the street or track. A part surviving a couple of pulls is not an indicator of durability. We have swapped out ACT singles for Exedy twins on multiple cars running sequential twins making less than 400hp, when the ACTs started slipping. Also had a customer put down over 500whp on our dyno with an ACT XTG6, it blew apart on the second run at the quarter mile, installed a twin disk and has been going strong for years.
Will it matter (for a streeted car) if the OP's car has a lightened FW?
I do have light weight flywheel.
Might matter if it's a single disk replacement, I imagine 6 puck unsprung would suck even more on a light flywheel than it would a heavy stock flywheel. Probably more that I would be stalling it instead of spinning tires every time I try to get going.
Multi-disk clutches will have their own flywheel.
I still don't really think it's been answered as to how streetable a multi-disk can be. The one I drove was unsprung and was 100% an on/off switch. Are some of the multi disk suggestions here easy to drive on the street? I don't plan on regularly driving in stop and go traffic, but my driving is entirely on the street and not the track.
Im using the standard act ss disk with hd pressure plate. Been around 400+ whp for some time and even with 20+ track days its held up well.
There seems to be mixed thoughts on the ACT full face disk with XT pressure plate vs ACT sprung 6 puck with HD pp. Both seem to suit most 500whp situations, and Im not sure which I would prefer. XT pp concern is its stress on clutch fork, collar, etc even with my newer "hardened" forks. Sprung 6 puck concern is just drivability.
I still don't really think it's been answered as to how streetable a multi-disk can be.
As I said before (in maybe too many words to be clear).
Exedy sprung 6 puck twin disk was more streetable for me than ACT HD or XT PP/sprung 6 puck single/lightweight flywheel and slightly less streetable than ACT HD PP/SS full face disk/lightweight flywheel.
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The Exedy sprung 6 puck twin has very low pedal effort and lots of partial engagement area.
The less streetable features are it does have low inertia and if you let off the clutch too fast it has zero slip one its fully engaged.
I will put it this way, my wife thanked me for installing the twin disk on ther 20b, it made it easier for her to drive then the ACT XTSS on the 13b. She now wants a twin disk on the 13b-re vert.
I now have the Exedy triple on the 20b, even that is perfectly street friendly and holds the power.
The twin disks become very switch-like when the disks are worn out, just had to replace a set on a 500hp TII
Last edited by Banzai-Racing; 10-07-16 at 05:37 AM.
Ah thanks, sounds like a twin disk would be worth looking at then. Guess now it depends on whether I want $2k in a good clutch or $500 in one that may or may not hold up.
I still don't really think it's been answered as to how streetable a multi-disk can be.
As I said before (in maybe too many words to be clear).
Exedy sprung 6 puck twin disk was more streetable for me than ACT HD or XT PP/sprung 6 puck single/lightweight flywheel and slightly less streetable than ACT HD PP/SS full face disk/lightweight flywheel.
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The Exedy sprung 6 puck twin has very low pedal effort and lots of partial engagement area.
The less streetable features are it does have low inertia and if you let off the clutch too fast it has zero slip one its fully engaged.
ACT (sprung disc) HD is more streetable than a twin disc for me. I've driven both the exedy carbon and non carbon both are grabby with a high pedal (bigger surprise factor and require higher revs/more slip). They are great kits but I'd never put one on a street car. Of course I don't run more than 350 HP on a street car either LOL.
As far as I know the ACT HD is still the best overall clutch for 400 and less HP which is all I need or care about. The only down side I can think of is the heavy pedal and wear and tear on the clutch fork, oh and you should also use an SS line because it will kill the oem line.
PS Best street clutch for 300 and lower is the old school centerforce. If they are still even made? Feels exactly like stock or better with 20 percent more grip.
09-28-16, 05:54 PM
