ChrisRX8PR

So the purpose of this thread is to get input from people that have had both street discs and bronze discsin cars with 400-500whp...

I am currently in the search for a reliable clutch upgrade. For where I stand and where I want to be the ACT upgrade that includes the HD plate with the 6 puck sprung bronze disc can do the job reliably(450-500whp or about 400-420lbf tq at the flywheel). However I have an experienced RX-7 guy telling me that I should get the Xtreme pressure plate but use a street disc because the bronze disc will eat my flywheel (ACT pro-lite) based on the fact that I drive the car alot. by alot I mean that during summer it is my primary vehicle and I will drive it to work and back at least 3-4 times a week(40mile there an back) and all the time on the weekends.... so we are talking about a real street, daily driver that I depend on regularly and use 100% of the time when I am not working on it (or about 10k miles a year). I figured there was more collective experience in this forum than trying to gather it elsewhere so give me your opinions.

My only worry is that the X-treme is extremely hard and RX-8s have been know to have the clutch pedal braket rip off after use even with lighter upgrades than the X-treme.

I guess my question is, will the HD plate with the Bronze clutch eat my flywheel as much as people say in a car that I drive this much?

Thanks for the input.

Chris

ChrisRX8PR

Anyone???

Chris

Jason

iTrader: (5)

Chris the HD with the sprung 6 puck would be fine for an RX-8 depending on what you are going to use it for. Street or track? If track then go with the ZM8-XTG6 which has the extreme plate. Its going to take more abuse than the HD plate.

jason

ChrisRX8PR

The car is driven 90% of the time on the street (lost of starts from a standstill where the clutch has to be slipped at least a bit to get going) with occasional visits to the drag strip and street gatherings. I drive it aggressively, getting on it at least once each time I drive it. I already have the 6 puck sprung disc from ACT and the Prolite Flywheel.

My biggest worry is grinding a nice groove into my flywheel because of the 6 puck disk. Do you think this will happen with all the driving I do, most of it commuting with lots of stop and go? Or is this only something that only happens when the clutch slips while under power?

That is where the question rose of whether I should get the X-treme with the street disc or the HD and keep the 6 puck sprung disc

Also, from your own experience, do you think the HD plate with the 6 Puck disc is able to handle 450-500whp? I am already at the 400 mark and plan on going higher so I am trying to think ahead.

Thanks for the input.

Chris

Jason

iTrader: (5)

The clutches are really rated by torque numbers. We have used the HD 6 puck sprung hub on RX-7's making 400 ft pounds with no problems. I know the RX-8 makes less torque so it shouldnt be a problem.

Busted7

I have used 6 puck clutchs for 7 years and have groved every fly wheel and pressure plate they just wear if you use them.

I have finally gone with the twin disc and love it soft clutch pedal slips smooth and if you want hooks like hell when you race hooks better when hot!

ChrisRX8PR

hmmmm. I see. I have noticed that the Rx-8 will yield more Hp with less TQ than a tipical RX-7....probably due to the fact the engine is designed to produce power further into the RPM range.

Ok, so I am convinced that the 6 puck and HD plate will hold what I want. Now I just need to figure out if I want to allow it to "machine" my flywheel.

I have some thinking to do.

Thanks for the input.

Chris

ChrisRX8PR

And that confirms my worry.

I leaning towards an X-treme plate with the stock or street disc. I know the dual disk is great, I drove one on a 20b, but it is cost limiting. I guess I will have to find a way to keep the pedal from riping out of the bracket . It will do this after clutch upgrades or even after lots of miles on some of the early stock cars.

If anyone has any suggestions let me know.

Thanks.

Chris

dregg100

iTrader: (34)

street disc and HD or extreme plate. i have a street disc and hd plate on my 7 and it holds just fine.

ChrisRX8PR

How much hp/tq are you putting down to the wheels?

Thanks for the input....I will probably go this direction.

Chris

ChrisRX8PR

Hello again,

I have found a good deal on a slightly used OS Giken twin disc clutch for my car. It is the Ts2c (the larger of the two OS sells) which will take all the power I throw at it. The only thing that worries me is the fact that the discs are not sprung, they are solid hubs. The clutch is such a good deal that it would cost less than a full ACT kit so I am greatly inclined towards it.....and it wont hurt my pedal because the pressure plate is not super heavy.

I drive my car in the street and my tranny is stock, does anybody have any experience with this or a similar high HP set up using solid hub discs? Please advise.

Thanks,

Chris

classicauto

iTrader: (3)

I know he's making 440whp, but not sure on the TQ

ChrisRX8PR

Do you have any input on my second question after that one? I am about to pull the trigger on this clutch deal but I am worried about the solid hub discs.

Thanks for the reply,

Chris

fd_neal

iTrader: (4)

I have run the racing beat sprung 6puck, clutch was horrible for the street, hooked like hell, but one of the harshest clutches ive ever tried on the street. Thourally ate the flywheel in only a few thousand miles

Right now im running a spec stage 2+ in my 7, easy pedal pressure, slips nice to get going, but still hooks. The car has something around 400hp, never dyno'd.

I know not the clutches your looking at, but i would never again put a 6 puck in any car that i was intending on street driving. Full discs are so much smoother and it doesnt sound like your making retarded amounts of power that a full disc couldnt grip.

ChrisRX8PR

Thanks for the input....haha....I'm working on the "retarded amounts of HP" though.

Currently I have a six puck sprung disc on a slightly higher than stock pressure plate and when I shift hard it sometimes slips a little, so its on the edge and I haven't even gotten to were I want to be power wise....

I understand that an Xtreme plate with a street disk would do the job.....but the stock pedal on my car tends to rip off when using heavy pressure plates. when you add the cost of the pressure plate to the pedal reinforcing kit it comes out to alot more than what I am getting this OS giken for and its pressure plate isn't too high compared to the stock one, it only worries be because of the solid hub disc.


Chris

oo7arkman

iTrader: (2)

I am a fan of the twin plate clutch. That is what I am running now (exedy), and the engagement is smooth, well more smooth than a puck, and it reeeaaallly grabs when you need it to.

Though it sounds like if you stick with the puck setup it is really going to be worth your while to invest in the pedal reinforcement kit. It is obviously a weak link and something you will always have to compensate for even if it means not being able to use what you would ideally use (just like in this case). Sounds like the pedal kit is just something you need to do. That would be a stupid problem to have break and strand you somewhere..

ChrisRX8PR

Nice!
That is what is nice about the twin disk, it won't increase pressure like an ACT X-treme pressure plate will so the pedal reinforcement isn't necessary.

Is your twin disc set up using sprung discs or solid ones?

Thanks

Chris

ChrisRX8PR

Any with more input on solid hub twin disc clutchs?

Thanks,

Chris

classicauto

iTrader: (3)

Don't know sorry, I've ridden in an OS giken twin plate FC, but to my knowledge the friction plates on it were sprung.....the ride and engagment seemed nice (didn't feel jerky from the passenger seat) but I'm not 100% on if they were solid or not.