John Scott Posted March 21, 2006 Share Posted March 21, 2006 Word to the wise' date=' be careful in your choices for your application. Don't pick up a screwdriver and expect it to be a hammer. Mike [/quote'] No you can hammer much better with a big pair of vice grips. Quote Link to comment Share on other sites More sharing options...
speeder Posted March 29, 2006 Share Posted March 29, 2006 Well, I have to update this. I hit the strip at SEZ with my new 325/50-15 Mickey Thompson ET Street radials and my Spec Stage 3+ clutch didn't make it through 2nd gear. Something in the clutch must have broken (I will pull it in the next few days and report) because the car will hardly move under its own power now. FWIW, No one at SEZ with experience with SPEC Clutches had anything good to say about them. The consensus among drag racers there was that ACT is the best. I will be getting the Clutch Specialties setup with ACT pressure plate and sintered iron sprung disc a la TimZ. Quote Link to comment Share on other sites More sharing options...
EZ-E Posted March 29, 2006 Author Share Posted March 29, 2006 Thanks for that update Pete, seems I might as well be sending my Spec back to the drawing board and get myself an ACT. Quote Link to comment Share on other sites More sharing options...
Nismo280zEd Posted May 12, 2006 Share Posted May 12, 2006 Well i swear by my centerforce clutches.. but i don't run them with turbos either. I run a stage 2 not the dual friction.. and i swear by it... even when 3/4 of the material was gone from the disc.. it drove me around for 2 weeks... never slipped and didn't burn the flywheel. Honestly you never woulda guessed it was bad except for the slight chimmy out of first. The only reason it broke was cause it sat for 5 years. -Ed Quote Link to comment Share on other sites More sharing options...
alexideways Posted May 12, 2006 Share Posted May 12, 2006 Maybe the weird " sometimes it hold and sometimes it fails" issue is due to the kind of tires you'r using, for people with less sticky tires, when you let go at 3000, your tires skid for a little while, softening the stress in the drive train. For those with supergumballs, well if the tire has an higher breaking point than the clutch guess what? That "not so good for hard lauches" clutch will give way. OR, could it be from the fact that centerforce was braought to life (I think) with the rise of the rice and mainly had their efforts concentrated on drag? That would make their centrifugal weights effective only at stupid high for a "DRIVEN" car no? Quote Link to comment Share on other sites More sharing options...
Nismo280zEd Posted May 15, 2006 Share Posted May 15, 2006 this is true... they arn't drag clutches, they are performance street clutches. I don't know of anybody blown' out a centerforce from just shifting... honestly i don't know of anyone that has blown a centerforce until this thread. -Ed Quote Link to comment Share on other sites More sharing options...
pparaska Posted June 10, 2006 Share Posted June 10, 2006 Funny thing is people on here were saying Keisler Engineering was selling Sachs clutchs for their TKO600 s behind big blocks. When I told them my application, he said he thought it was on the edge of the Sachs 600 ft-lb clutch (10.5") and suggested a SPEC 2+. He said they've been selling the SPEC clutches for 9 months without ONE problem or comeback. I ordered the Speck Stage 2+, as it's good for 650+ lbft. My theory is that the Datsun disc is so small in diameter it's being much mre stressed than many of these musclecar clutches and that's why they are failing. Quote Link to comment Share on other sites More sharing options...
veritech-z Posted June 10, 2006 Share Posted June 10, 2006 I think PPraska is on to something with that one. I called up Bay City Clutch (a local drivetrain shop that builds custom clutch components for decent prices) when I first got my z to see if they could build me a clutch that could hold 300 or so hp on the non-turbo sized flywheel (because that's the one I had), and the guy laughed when he heard what the disc diameter was. He told me he'd look into it and call me back, and then he never called me back. I suspect he didn't take me seriously, but I can't be sure... Quote Link to comment Share on other sites More sharing options...
Collectindust240Z Posted June 10, 2006 Share Posted June 10, 2006 I don't know, I've driven countless hard mile on my CF DF clutch with no problems at all. But I'm running N/A. My friend is running one in his 468 powered 65 Nova with drag radials with no slippage. As a matter of fact, he keeps blowing up Muncies. He shifts the thing at around 7000!!! Quote Link to comment Share on other sites More sharing options...
briann510 Posted June 10, 2006 Share Posted June 10, 2006 We have had our CF DF clutch in for 8K hard driven and raced mile with no problems at all. These include countless dragstrip 4K launches with drag radials and pretty much every shift around town done at 6500 and slammed into the next gear. Its grabbing today just as well as it did when it was installed. As noted in post above mine also, I also have a CF DF in my 600 hp Pontiac and the clutch is fine after 3 years of hard driving/racing. Quote Link to comment Share on other sites More sharing options...
alexideways Posted June 15, 2006 Share Posted June 15, 2006 Technique problem maybe, some people ar e harder on the machine than others, I remember when i was a bit yonger, me and severals of my friends had RABBITS and we were practicly all build the same way since back then, there was about only neuspeed that made real parts and some cars always broke and some were astonishingly reliable for beaters like that so, we concluded that it was probably due to driving styles. What'd y'all think?? Quote Link to comment Share on other sites More sharing options...
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