Denom

iTrader: (2)

Alright, not to beat an old drum, but I have a 1999 camaro ss. I had the LS1 clutch installed along with a shim (.150), a new slave cylinder, and I have a new master cylinder with the drill mod. The car runs fine at pedestrian speeds. Heck, it will light them up in first. Oddly, when I went to run at the track (After over 500 miles of break in), the car would hit 1st and 2nd gear fine, then I'd reach for 3rd, but see the tachometer moving up, but no real forward motion with the car. The same thing could be said of 4th gear. The clutch pedal would return to the top, but I'm fairly certain the slave cylinder is functioning normally, but I think I have clutch slippage issues.

Can anyone let me know some ways I can tackle this? I'd like to keep the clutch as it is new. Could it just need to be bled from the slave cylinder, or do it possibly need the flywheel resurfaced. Any advice would be appreciated.

Thanks

HCI2000SS

iTrader: (2)

Is this a stock LS1 or LS7 clutch? Because you mention both

Denom

iTrader: (2)

It's the stock LS7 clutch.

Crf450r420

iTrader: (1)

If you shim the slave in wrong it could be slightly holding on the clutch. The higher the gear the more torque is felt up the drive line. What percentage of the clutch travel will release drive?

Denom

iTrader: (2)

I'm not really sure. I mean in normal driving it's fine. It could be shimmied wrong. There doesn't seem to be a consensus on whether to shim or not with the LS7. I'll bring it up to the mechanic when I have him look at it on Wednesday.

tech@WS6store

iTrader: (2)

Shimming is hardly ever necessary and really instead of doing the drill mod just buy new gm master and slave and be done. Far superior to any stock factory installed components in an fbody.

Denom

iTrader: (2)

It turns out the mechanic screwed up the install. When he initially installed the clutch he knocked a freezer plug into the oil pan, when he removed the pilot bearing. Apparently when he put in the new freezer plug it wasn't seated properly, and leaked all over the new clutch, thereby destroying it prematurely.

tech@WS6store

iTrader: (2)

Happens often actually

Project GatTagO

iTrader: (7)

Don't need a shim with the LS7 clutch.

Andrew

gsteele

Explain?

Denom

iTrader: (2)

Actually the new mechanic measured, you DO need a shim.

Project GatTagO

iTrader: (7)

Whatever you say buddy...carry on...

Andrew

tech@WS6store

iTrader: (2)

We have sold and installed so many, zero have required a shim whether using old hydraulics or new. They may with an aftermarket slave but thats not the fault of the clutch.

Denom

iTrader: (2)

Per this article I had the mechanic measure to see if the clutch requires a shim. https://ls1tech.com/forums/manual-transmission/1030815-does-your-clutch-setup-need-shim.html

It did, in fact, require a shim. My understanding is that your clutch will prematurely wear without a shim. I have no issues with clutch engagement off the floor.

Project GatTagO

iTrader: (7)

Looks like you have it all figured out...