high rpm clutch sticks to floor - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

jonsusoju · 10-02-2012, 01:34 AM

replaced blitz active clutch (single) that previous owner was running. that was a pain in the buttocks.

currently running ACT 6 puck heavy duty with prolite flywheel. while i was at it, i replaced oem nabco clutch slave with duralast slave cylinder (lifetime warranty) and connected clutch master to slave with steel braided line.

I am NOT running through dampening box. i had enough of that shit and learned my lesson early on with air getting into the system and being stranded.

clutch fork has about 5mm of play left and right. decided not to change it.

noticed small amount of tranny fluid leaking after clutch install. came from under the shifter area so i threw on a new oem upper trans shifter gasket and the trans fluid eventually slowed to about 3 small drips over the span of a night. I also park on a steep hill and could have overfilled... i put a new rear main seal to that can't be cause of leak...either way, i know the sr20det is getting old and i can expect the occasional leak here and there so long as i keep an eye on the levels.

during the clutch swap had to silicon the part of the transmission holding the input shaft. looks like this if i'm not accurately describing it:

http://www.tune2win.com/_useruploads...0swap/sr20.jpg

literally took off the while old part and silicon'd a new one on. it looked like a plate and a shaft attached...for lack of mechanical terminology.

spencer at sideways performance helped me with that, they were a great help to my whole clutch ordeal and had the part.

shifting feels solid, a bit notchy at cold start.

this is my daily and its been fine and dandy since the clutch replacement about 850 miles ago.

today I decided to push my car past my usual daily threshold of 3000-3500rpm (usually when boost kicks in, running 13 psi on s15 turbo). i was at about 4700 in 3rd.

as soon as I let off the gas to shift up (from 3rd to 4th), i pushed in the clutch pedal and it stuck to the floor. obviously I couldnt shift since it was stuck. I naturally decelerated since I went to neutral and had to manually lift my pedal from the back. i dropped down to 3000rpm and my clutch pedal reengaged perfectly fine. I shifted at lower rpms (3-3500) and the clutch pedal returned perfectly fine.

I parked my car for around 7 hours at work then started it up to drive home.

clutch felt fine, no odd engagement feeling (not spongy). i gave it a few pumps for good measure before i left the parking lot. street driving was fine, below 40mph and sitting in 4th.

I decide to see if i could replicate the earlier phenomena. keep in mind i had been driving for 12 minutes already. I pushed to 4700-5000rpm again in third and attempted to shift up. clutch pedal stuck again and i had the same thing happen to me, just like earlier in the day.

i considered a new master cylinder, but since this problem only happened to me at higher rpm, I think it has something to do with my transmission. if it were a clutch master cyl problem, i would be getting this problem throughout the rev band. (?)

any help on this matter would be great. i actually want to enjoy my car once in a while.

if you need any other info, ask away.

10-02-2012, 01:34 AM	#1
jonsusoju Zilvia Junkie Join Date: Dec 2011 Location: Orange Posts: 575 Trader Rating: (3) Feedback Score: 3 reviews	high rpm clutch sticks to floor replaced blitz active clutch (single) that previous owner was running. that was a pain in the buttocks. currently running ACT 6 puck heavy duty with prolite flywheel. while i was at it, i replaced oem nabco clutch slave with duralast slave cylinder (lifetime warranty) and connected clutch master to slave with steel braided line. I am NOT running through dampening box. i had enough of that shit and learned my lesson early on with air getting into the system and being stranded. clutch fork has about 5mm of play left and right. decided not to change it. noticed small amount of tranny fluid leaking after clutch install. came from under the shifter area so i threw on a new oem upper trans shifter gasket and the trans fluid eventually slowed to about 3 small drips over the span of a night. I also park on a steep hill and could have overfilled... i put a new rear main seal to that can't be cause of leak...either way, i know the sr20det is getting old and i can expect the occasional leak here and there so long as i keep an eye on the levels. during the clutch swap had to silicon the part of the transmission holding the input shaft. looks like this if i'm not accurately describing it: http://www.tune2win.com/_useruploads...0swap/sr20.jpg literally took off the while old part and silicon'd a new one on. it looked like a plate and a shaft attached...for lack of mechanical terminology. spencer at sideways performance helped me with that, they were a great help to my whole clutch ordeal and had the part. shifting feels solid, a bit notchy at cold start. this is my daily and its been fine and dandy since the clutch replacement about 850 miles ago. today I decided to push my car past my usual daily threshold of 3000-3500rpm (usually when boost kicks in, running 13 psi on s15 turbo). i was at about 4700 in 3rd. as soon as I let off the gas to shift up (from 3rd to 4th), i pushed in the clutch pedal and it stuck to the floor. obviously I couldnt shift since it was stuck. I naturally decelerated since I went to neutral and had to manually lift my pedal from the back. i dropped down to 3000rpm and my clutch pedal reengaged perfectly fine. I shifted at lower rpms (3-3500) and the clutch pedal returned perfectly fine. I parked my car for around 7 hours at work then started it up to drive home. clutch felt fine, no odd engagement feeling (not spongy). i gave it a few pumps for good measure before i left the parking lot. street driving was fine, below 40mph and sitting in 4th. I decide to see if i could replicate the earlier phenomena. keep in mind i had been driving for 12 minutes already. I pushed to 4700-5000rpm again in third and attempted to shift up. clutch pedal stuck again and i had the same thing happen to me, just like earlier in the day. i considered a new master cylinder, but since this problem only happened to me at higher rpm, I think it has something to do with my transmission. if it were a clutch master cyl problem, i would be getting this problem throughout the rev band. (?) any help on this matter would be great. i actually want to enjoy my car once in a while. if you need any other info, ask away.