[ZR1] Clutch shudder
#1
Pro
Thread Starter
Clutch shudder
Guys,
Have 20K miles on my 2010. There is some mild "shudder" upon engagement of the clutch when taking off in first gear. Not bad, but would not expect to have this with a dual disk. Have had the vehicle for about 2 months now and has had this symptom since I picked it up. Is this normal for the LS9 clutch?
Don't want to tear in to anything that doesn't warrant it, so would like ot hear from the rest of the ZR1 team. My '06 LS2 was smooth, but it was not a dual disk, obviously.
Have 20K miles on my 2010. There is some mild "shudder" upon engagement of the clutch when taking off in first gear. Not bad, but would not expect to have this with a dual disk. Have had the vehicle for about 2 months now and has had this symptom since I picked it up. Is this normal for the LS9 clutch?
Don't want to tear in to anything that doesn't warrant it, so would like ot hear from the rest of the ZR1 team. My '06 LS2 was smooth, but it was not a dual disk, obviously.
#2
Melting Slicks
no, should be smooth. How dark is your clutch fluid? I may help to do the "Ranger" method and change the fluid if it is dark.
I generally change my fluid every 3k, because it does make a difference
I generally change my fluid every 3k, because it does make a difference
#4
Pro
Thread Starter
Master cylinder reservoir was "dry" when I picked up the vehicle. Have completely purged system with DOT4, all clean. Never any issues with pedal stroke or feel, just upon engagement, there is a minor shudder. I can slow down and slip it a bit more and avoid it, but normal engagement shows same issue. Vehicle did not show any signs of hard use and is 100% OEM.. All other fluids clean. Vehicle maintenance records show dealer oil change at 17K miles, so all good there.
#8
The Consigliere
Member Since: May 2006
Location: 2023 Z06 & 2010 ZR1
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Make a couple semi-hard launches, with some time in between them, and you might be able to "clean up" the clutch if it's glazed.
#10
Pro
Thread Starter
Have put about 600 miles on it. Limited city driving so have not ridden clutch that much. Would not expect a hard launch to cure it if it truly is glazed. Does seem a bit worse cold than hot. Don't believe I could make this a warranty issue. I've been building cars for almost 40 years and would not have expected this clutch to exhibit glazing, which I always attribute to overheating due to aggressively slipping the clutch for extended periods. Would think this dual disk would be more robust.
#12
Le Mans Master
Mine would do the same thing after going to the dragstrip. If I drove her in the city quite a bit she would smooth back out.
#13
Melting Slicks
#14
Pro
Thread Starter
My son and I discussed the same thing (re: where did the clutch fluid go).. There is no sign of leakage at all. Completely dry around clutch housing. No sign of a slave cylinder leak. All I can figure is the guy never serviced the clutch. Has not dropped a bit since purging with DOT4. Will keep an eye on it. I wondered if some clutch fluid leaked out into the disk and pressure plates causing a bit of slippage. Would need to tear into it to see if that's the case, but not bad enough for that much work right now. Will definitely keep an eye on it for any drop in level.