View Full Version : re: race clutches....help
hi guys.....
i am currently using a center force dual friction clutch...and it seems to be slipping now...i guess my 3 inch exhaust made a big difference...any way its slipping somewhere over 261ftlbs of torque...
now here is the question.......i am thinking of getting a ACT 6 puck racing clutch with is rated for 342ftlbs torque....but it is a full race clutch no springs..and says it has harsh engagement...see link..
http://www.advancedclutch.com/V3/mainframe.htm
who has driven on these types of clutches.....and how harse..is the engagement?
help......
thanks
adam
soloZ
10-21-2002, 04:42 PM
I got a ride in a Right hand drive Subaru Impreza Turbo and the owner had a racing clutch, If any of you know Joe Trinidad he was dring it and he would just release a little of the cluth and it is grabbing like crazy. I think he acyually stalled the car once, I think was a six puck also.
Shaman
10-21-2002, 05:32 PM
You get used to it. Almost nobody seems to be able to drive my car smoothly with a dual-plate Mcleod in it except me (rated good for 850lb/ft torque). I can launch the car around the pits like a lamb now... as long as I keep the RPM above 1500 RPM so the cam lumpiness doesn't buck the car, it's all golden.
IMHO, if you spend a month with it and you still can't launch the car without revving it hard, etc., the clutch is too grabby. When you first try it, you'll hate it, but then unless the clutch is profoundly silly, you get a feel for it. I doubt that you're going to run into a problem until you get into something really serious, like a 600tq clutch and a tiny aluminum flywheel.
ok...looks like a 6 puck race clutch it is....
that should be good for a while
turboawd
10-24-2002, 01:22 PM
ACT makes good stuff. Call them directly as see what they offer for your car. I would recommend the highest pressure plate they offer mated with their best organic disc they offer. This will allow smooth engagement. The ceramic puck discs are very grappy and hard on the driveline, especially when making good power. The puck discs to offer faster shifting however. Also ask them about 4 and 6 buck discs, one is supposed to be a little smoother.
Marsh
10-25-2002, 04:21 PM
Originally posted by Shaman
I can launch the car around the pits like a lamb now... as long as I keep the RPM above 1500 RPM so the cam lumpiness doesn't buck the car, it's all golden.
You also have a car with torque. I could see this beeing a little trickier in a turbo 4-banger.
Shaman
10-25-2002, 07:54 PM
Well, yes and no. I'm running a 0.544 lift, 248 duration cam in my car, along with ported heads. Under 2,000 RPM it wants to stumble and buck. Over 2,000 RPM, I grant you it makes over 400rwtq, but it's not friendly torque until around 2,500 RPM where it smoothes right out and feels like a sewing machine. It's very, very Jeckle/Hyde.
Adam may find he needs to rev up a bit more than usual, but I doubt (but don't guarantee) that it will be difficult to get used to. I've yet to drive any car or motorcycle that truly had a "vicious" clutch, you just have to get a feel for the engagement point, RPM to spin to and speed of engagement. Only "true" racing clutches like the dry setups you'll find on sequential trannies like the endurance cars in Lemans, say, need to be dumped under RPM and spun out of the pits...
Mind you, Adam is known for going extreme. :D
Shaman...
wouldn't the bucknig that you have described above actually be caused to a great extent by your light flywheel (I am assuming that you have a very light flywheel!?!? Ya got everything else in the fire-chicken ;)
Or is the lumpyness of your cam the cause? heeeeem
Just curious?
Jay
even at low boost i am making good torque? (ok..not compared to a big v8)....is low torque going to be an issue with this clutch...is this enough torque? or is it going to be an issue?
at 1500rpm i have 100ftlbs
at 2000rpm i have 130ftlbs
at 2500rpm i have 160ftlbs
at 3000rpm i have 210ftlbs
at 3500rpm i have 261ftlbs
Originally posted by Marsh
You also have a car with torque. I could see this beeing a little trickier in a turbo 4-banger.
Shaman
10-27-2002, 02:32 PM
Originally posted by Jay
wouldn't the bucknig that you have described above actually be caused to a great extent by your light flywheel (I am assuming that you have a very light flywheel!?!?
Nope, I had a stock flywheel in it up until now. I put an aluminum one in because there is so much compression that I've been having problems with the rear tires braking too hard (engine braking) at threshold. I mis-shifted into first from 6200 in second once and didn't hurt the motor because the motor wouldn't turn up with my foot on the gas... it slid around instead! Not that I want to hurt the motor, but I need to be able to control braking better without declutching... I'm going to miss some of that immediate torque off the corners, though. Then again, some argue I have some to spare in that department.
And, of course, I'll probably pick up about 10rwhp or so just with the flywheel change at high RPMs. Or so the theory goes. I'm expecting launches to be a bit worse.
To answer finally, yes. It's the cam lumpiness.
Cool.... thanks Steve.
see....... let that be a lesson to you kids out ther in internet-land.... never assume! ;)
so when is the flaming chicken going to be ready...we want the chicken...we want the chicken....
:)
Shaman
10-28-2002, 10:41 PM
Oh, don't worry. It's on its way.
Quieter, sadly. I liked making people jump when I fired it up. :(
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