Clutch Question
Thread Starter
Instructor
Joined: Apr 2017
Posts: 120
Likes: 17
From: Xenia Ohio
Clutch Question
09 Z51 M6 25k miles headers back, intake, and tsp stage 3 cam. Ive been having clutch issues for a while, slips in 3rd or higher above 4k rpm and/or when shifting hard. bled the clutch a few times as the fluid gets filthy really quickly and itll grab for a while after a fluid change. ive pretty much settled on just replacing with a monster lt1s with the billet support bearing and a new slave. my question is, and this might be indicative of further issues, but i've tried to practice launching a few times and with the clutch pedal in when i rev the car it pulls the pedal down and it wont release/engage. Im assuming as the car builds vacuum its doing something to the master cylinder?
Thread Starter
Instructor
Joined: Apr 2017
Posts: 120
Likes: 17
From: Xenia Ohio
Burning Brakes
Joined: Apr 2016
Posts: 1,120
Likes: 110
From: Chattanooga TN
There's a big difference in what you make in rear wheel horsepower vs. crank horsepower.
Thread Starter
Instructor
Joined: Apr 2017
Posts: 120
Likes: 17
From: Xenia Ohio
Burning Brakes
Joined: Apr 2016
Posts: 1,120
Likes: 110
From: Chattanooga TN
You also have to remember that yes that's a little bit more power than the Z06 but your are starting to beat on it which will shorten the life of it but if you an get a different master cylinder GM/maybe Tick it may help or the damage may already be done.
Safety Car
Joined: Nov 2007
Posts: 4,435
Likes: 874
From: Bay Area CA
The LS3/7 share the same clutch and with 480 rwhp it has more room to grow.
I would take the least expensive approach and replace the clutch master cylinder and add a clutch bleeder. Flush with D0T 4 and see if there is any improvement. The new clutch master cylinder design has improved seals and a black reservoir vs. white on the old one. I had the clutch master cylinder covered under service bulletin warranty, you still might be under warranty.
If that doesn't work, then replace the clutch.
25k on a clutch is low mileage, unless it was abused.
I would take the least expensive approach and replace the clutch master cylinder and add a clutch bleeder. Flush with D0T 4 and see if there is any improvement. The new clutch master cylinder design has improved seals and a black reservoir vs. white on the old one. I had the clutch master cylinder covered under service bulletin warranty, you still might be under warranty.
If that doesn't work, then replace the clutch.
25k on a clutch is low mileage, unless it was abused.
Last edited by Mike's LS3; Apr 20, 2018 at 10:52 AM.
Drifting
Joined: Dec 2016
Posts: 1,388
Likes: 220
09 Z51 M6 25k miles headers back, intake, and tsp stage 3 cam. Ive been having clutch issues for a while, slips in 3rd or higher above 4k rpm and/or when shifting hard. bled the clutch a few times as the fluid gets filthy really quickly and itll grab for a while after a fluid change. ive pretty much settled on just replacing with a monster lt1s with the billet support bearing and a new slave. my question is, and this might be indicative of further issues, but i've tried to practice launching a few times and with the clutch pedal in when i rev the car it pulls the pedal down and it wont release/engage. Im assuming as the car builds vacuum its doing something to the master cylinder?
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski