vibration at 3k

mark sweetser · 04-16-2006, 06:51 PM

just got a centerforce dual friction clutch kit installed. at same time, swapped to a new centerforce throw-out bearing, and a new pilot bearing supplied by the shop were i had install done. problem is, at 3,000 RPM in any gear, there is a bad vibration that rattles the whole car. wasn't there prior to clutch swap, even after swap to 3.73 gears. i still have 200 miles or so to go on the 450-500 mile break-in period recommended by centerforce on clutch. when the rattle comes on, the car seems to lose some steam. will this clear up after 200 or so miles, once the clutch is broken in and set correctly? i have been going fairly easy on the gas during the break-in (no WOT).

Hammer · 04-16-2006, 10:00 PM

Sounds like the clutch may not be dis-engaging all the way....

mark sweetser · 04-19-2006, 09:53 PM

thanks for the response...what would the fix be for that? is clutch defective? wrong one? installed incorrectly? thanks hammer!

1989GT · 04-20-2006, 08:29 AM

Does it only happen when moving? Try putting the tranny in neutral then rev to 3k see if the vibration is there, then put the clutch in and rev to 3k see if it's there. Let us know.

mark sweetser · 04-20-2006, 08:57 PM

thanks for the idea, i should have thought of that. NO, it does not vibrate at all when car is in neutral and not in motion...rules out flywheel, right? i did have it re-surfaced on clutch install. noticed today on way home: had my left foot covering clutch after i let pedal out, and when i applied throttle, clutch sprung back up and contacted my foot. what's up?

Hammer · 04-20-2006, 09:15 PM

Quote:

had my left foot covering clutch after i let pedal out, and when i applied throttle, clutch sprung back up and contacted my foot. what's up?

Hmmm.... I would say that there is probably a problem between your flywheel and clutch disk. Are you sure you used the correct throw-out bearing for your application?

1989GT · 04-21-2006, 10:52 AM

Do you have an adjustable cable and quadrant? If so I would play around with it to see if the clutch is adjusted right, since the vibration only occurs when the car is in motion I'm leaning more towards the driveshaft. Reving in neutral(clutch pedal out) would rule out the clutch/pressure plate/flywheel and input shaft on the tranny. I would disconnect the drive shaft and rotate it over a hole and hook it back up and see if the vibration is there/get's better or worse. Do that all the way around until it either stops or you're back at the starting point. I would say though that it could also be the clutch is not adjusted right and could just be manifesting itself while in motion at 3k RPM.

04-16-2006, 06:51 PM	#1
mark sweetser 96GREENGT Join Date: Mar 2005 Location: las vegas Posts: 51	vibration at 3k just got a centerforce dual friction clutch kit installed. at same time, swapped to a new centerforce throw-out bearing, and a new pilot bearing supplied by the shop were i had install done. problem is, at 3,000 RPM in any gear, there is a bad vibration that rattles the whole car. wasn't there prior to clutch swap, even after swap to 3.73 gears. i still have 200 miles or so to go on the 450-500 mile break-in period recommended by centerforce on clutch. when the rattle comes on, the car seems to lose some steam. will this clear up after 200 or so miles, once the clutch is broken in and set correctly? i have been going fairly easy on the gas during the break-in (no WOT). __________________ -'96 GTS Deep Forest Green Metallic- 8#Powerdyne,Bassani Cat-X,2 chamber Flows, FMS alum. DS,Kenne Brown subframes,Pro 5.0 short throw,FRPP 3.73's,Accufab Plenum/75mm TB,11# blower pulley,Bassani mid headers,Eibach 1.5" springs,17" Cobra R's w/ 275/40zr-17 g-force kd's,Centerforce Dual Friction -'87 Black LX 5.0 BBK shorties&Cat-X,2 chamber Flows,MSD ign,stock 3.08's,MGW short-throw,BBK cold-air,King Cobra clutch,235/55-17(F)&255/50-17(R) Kumho Ecsta's on 95 Cobra R 4-lugs

04-16-2006, 10:00 PM	#2
Hammer AKA "Dr. Evil" Join Date: Feb 1999 Location: South Fork Ranch Posts: 1,721	Re: vibration at 3k Sounds like the clutch may not be dis-engaging all the way.... __________________ Uncle Sam "What the hell is up with all the gauges? Calling Captain Kirk, your ride awaits... Phasers on stun...."

04-19-2006, 09:53 PM	#3
mark sweetser 96GREENGT Join Date: Mar 2005 Location: las vegas Posts: 51	Re: vibration at 3k thanks for the response...what would the fix be for that? is clutch defective? wrong one? installed incorrectly? thanks hammer! __________________ -'96 GTS Deep Forest Green Metallic- 8#Powerdyne,Bassani Cat-X,2 chamber Flows, FMS alum. DS,Kenne Brown subframes,Pro 5.0 short throw,FRPP 3.73's,Accufab Plenum/75mm TB,11# blower pulley,Bassani mid headers,Eibach 1.5" springs,17" Cobra R's w/ 275/40zr-17 g-force kd's,Centerforce Dual Friction -'87 Black LX 5.0 BBK shorties&Cat-X,2 chamber Flows,MSD ign,stock 3.08's,MGW short-throw,BBK cold-air,King Cobra clutch,235/55-17(F)&255/50-17(R) Kumho Ecsta's on 95 Cobra R 4-lugs

04-20-2006, 08:29 AM	#4
1989GT Registered Member Join Date: Apr 1999 Location: Cincinnati,OH Posts: 1,511	Re: vibration at 3k Does it only happen when moving? Try putting the tranny in neutral then rev to 3k see if the vibration is there, then put the clutch in and rev to 3k see if it's there. Let us know. __________________ 89GT,Pro-Bullet 306, H/C/I and a bunch of other stuff. Sold 00GT, Vortech S-Trim, Steeda Boost Pipe, C&L intake, Mac off-road H-pipe, Flowmasters, B&M Ripper shifter, Eibach Sportline springs, Koni Struts/shocks, MM full length subframe connectors, Cobra brakes, 3.73's. My Car Domain Page

04-20-2006, 08:57 PM	#5
mark sweetser 96GREENGT Join Date: Mar 2005 Location: las vegas Posts: 51	Re: vibration at 3k thanks for the idea, i should have thought of that. NO, it does not vibrate at all when car is in neutral and not in motion...rules out flywheel, right? i did have it re-surfaced on clutch install. noticed today on way home: had my left foot covering clutch after i let pedal out, and when i applied throttle, clutch sprung back up and contacted my foot. what's up? __________________ -'96 GTS Deep Forest Green Metallic- 8#Powerdyne,Bassani Cat-X,2 chamber Flows, FMS alum. DS,Kenne Brown subframes,Pro 5.0 short throw,FRPP 3.73's,Accufab Plenum/75mm TB,11# blower pulley,Bassani mid headers,Eibach 1.5" springs,17" Cobra R's w/ 275/40zr-17 g-force kd's,Centerforce Dual Friction -'87 Black LX 5.0 BBK shorties&Cat-X,2 chamber Flows,MSD ign,stock 3.08's,MGW short-throw,BBK cold-air,King Cobra clutch,235/55-17(F)&255/50-17(R) Kumho Ecsta's on 95 Cobra R 4-lugs

04-21-2006, 10:52 AM	#7
1989GT Registered Member Join Date: Apr 1999 Location: Cincinnati,OH Posts: 1,511	Re: vibration at 3k Do you have an adjustable cable and quadrant? If so I would play around with it to see if the clutch is adjusted right, since the vibration only occurs when the car is in motion I'm leaning more towards the driveshaft. Reving in neutral(clutch pedal out) would rule out the clutch/pressure plate/flywheel and input shaft on the tranny. I would disconnect the drive shaft and rotate it over a hole and hook it back up and see if the vibration is there/get's better or worse. Do that all the way around until it either stops or you're back at the starting point. I would say though that it could also be the clutch is not adjusted right and could just be manifesting itself while in motion at 3k RPM. __________________ 89GT,Pro-Bullet 306, H/C/I and a bunch of other stuff. Sold 00GT, Vortech S-Trim, Steeda Boost Pipe, C&L intake, Mac off-road H-pipe, Flowmasters, B&M Ripper shifter, Eibach Sportline springs, Koni Struts/shocks, MM full length subframe connectors, Cobra brakes, 3.73's. My Car Domain Page

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