Clutch not "slipping", but CHATTERING fully engaged in boost.
#1
Clutch not "slipping", but CHATTERING fully engaged in boost.
Anyone ever heard of this? I called ACT the clutch company that makes the kit, and they'd never heard of such an issue.
I'm on an NA drivetrain, with a stock NA flywheel, but with a Large streetported S5 TII block. Stock turbo, custom front mount, running 7psi. RTEK 1.7 550/780cc injectors. 3" downpipe back.
When doing WOT pull in 3rd the clutch seems(I use seems, because that's what I think) to slip, but not the typical, soft, rev up without accelerating slip. It's a VIOLENT CHATTERING slip that shakes the whole car. It's pretty damn scary really.
Has anyone EVER heard of something like this?
Clutch is an ACT sprung 6-puck disc, with an Ebay pressure plate. Held 10psi of boost fine before the front mount, this is a new issue.
I'm on an NA drivetrain, with a stock NA flywheel, but with a Large streetported S5 TII block. Stock turbo, custom front mount, running 7psi. RTEK 1.7 550/780cc injectors. 3" downpipe back.
When doing WOT pull in 3rd the clutch seems(I use seems, because that's what I think) to slip, but not the typical, soft, rev up without accelerating slip. It's a VIOLENT CHATTERING slip that shakes the whole car. It's pretty damn scary really.
Has anyone EVER heard of something like this?
Clutch is an ACT sprung 6-puck disc, with an Ebay pressure plate. Held 10psi of boost fine before the front mount, this is a new issue.
#2
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Are your sure your drive shaft u-joints are in good shape? What is awesome about this, is you can't simply replace them (well, unless you go my route and have a shop custom wizardy the **** so you can) without replacing the whole shaft.
Does the rear or middle of the car seem to shake more? sorry, "chatter"
Does the rear or middle of the car seem to shake more? sorry, "chatter"
#3
Are your sure your drive shaft u-joints are in good shape? What is awesome about this, is you can't simply replace them (well, unless you go my route and have a shop custom wizardy the **** so you can) without replacing the whole shaft.
Does the rear or middle of the car seem to shake more? sorry, "chatter"
Does the rear or middle of the car seem to shake more? sorry, "chatter"
#7
talking head
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burnt facing on pressure plate and flywheel is notorious for a shudder on engage
probs needs a mild re-facing on both , including adjusting the flange face height accordingly
i would be looking close also at the straps on side of pressure plate
and perhaps a double check of the button center springs to see if one has torn itself slack
probs needs a mild re-facing on both , including adjusting the flange face height accordingly
i would be looking close also at the straps on side of pressure plate
and perhaps a double check of the button center springs to see if one has torn itself slack
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#9
burnt facing on pressure plate and flywheel is notorious for a shudder on engage
probs needs a mild re-facing on both , including adjusting the flange face height accordingly
i would be looking close also at the straps on side of pressure plate
and perhaps a double check of the button center springs to see if one has torn itself slack
probs needs a mild re-facing on both , including adjusting the flange face height accordingly
i would be looking close also at the straps on side of pressure plate
and perhaps a double check of the button center springs to see if one has torn itself slack
I similarly looked for other issues to fix my shudder, but it just needed to come apart.
I'm skeptical that the eBay pressure plate since even stock clutches can handle that power level.
On a side note, 7 psi on a front mount should not produce more power than 10 psi on a top mount. So that probably isn't what is causing the problem.
#11
Grabba Dabba Goo!
I installed a clutch on my na in April and did not resurface the flywheel which had hot spots and now I'm definitely getting a chatter in reverse and sometimes in first.
That's what I get I guess.
That's what I get I guess.
#15
^ change the pilot bearing, seal, and release bearing if you didn't last time. To save you from dropping the tranny again later. Be picky when inspecting stuff.
When having someone machine it, have them remove the pins and machine the same amount on the step where the pins are, so that the clamping force isn't affected (only NA's have the step on the stock flywheel). They should take the least amount needed to remove hot spots and make it all even (0 runout).
When having someone machine it, have them remove the pins and machine the same amount on the step where the pins are, so that the clamping force isn't affected (only NA's have the step on the stock flywheel). They should take the least amount needed to remove hot spots and make it all even (0 runout).
#16
Update:
Bought a new 6 puck clutch, new PP, rated at 345ft lbs, resurfaced the flywheel, and torqued everything to spec.
Didn't change a thing. I can't even get to 2psi before the clutch starts chatter-slip-vibrating. I'm getting the SAME exact issue as before, with a completely different clutch, and PP.
Really need to tune this car ASAP, and I can't with this issue.
Bought a new 6 puck clutch, new PP, rated at 345ft lbs, resurfaced the flywheel, and torqued everything to spec.
Didn't change a thing. I can't even get to 2psi before the clutch starts chatter-slip-vibrating. I'm getting the SAME exact issue as before, with a completely different clutch, and PP.
Really need to tune this car ASAP, and I can't with this issue.
#25
Full Member
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could be clutch "pump up"
does it happen immediately with everything over-night cold or does it kind of come with warming up?
had this on my old FC. If you pull "up" on the clutch pedal really hard it would release the trapped fluid and stop slipping. mine would also feel like the engagement point was kinda moving slowly upwards
does it happen immediately with everything over-night cold or does it kind of come with warming up?
had this on my old FC. If you pull "up" on the clutch pedal really hard it would release the trapped fluid and stop slipping. mine would also feel like the engagement point was kinda moving slowly upwards