Yet another LS7 Clutch Issue - LS1TECH - Camaro and Firebird Forum Discussion

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Yet another LS7 Clutch Issue

Old 10-12-2018, 02:04 AM
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Default Yet another LS7 Clutch Issue

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
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Old 10-12-2018, 05:01 AM
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Is this a stock LS1 or LS7 clutch? Because you mention both
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Old 10-13-2018, 02:11 AM
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Originally Posted by HCI2000SS View Post
Is this a stock LS1 or LS7 clutch? Because you mention both

It's the stock LS7 clutch.
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Old 10-14-2018, 11:08 AM
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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?
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Old 10-14-2018, 09:16 PM
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Originally Posted by Crf450r420 View Post
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?
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.
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Old 10-14-2018, 09:33 PM
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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.
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Old 10-20-2018, 11:31 PM
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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.
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Old 10-21-2018, 12:18 AM
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Happens often actually
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Old 10-21-2018, 06:34 PM
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Don't need a shim with the LS7 clutch.

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Old 10-21-2018, 07:43 PM
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Originally Posted by Crf450r420 View Post
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?
Explain?
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Old 10-25-2018, 01:05 PM
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Originally Posted by Project GatTagO View Post
Don't need a shim with the LS7 clutch.

Andrew
Actually the new mechanic measured, you DO need a shim.
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Old 10-25-2018, 01:17 PM
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Originally Posted by Denom View Post
Actually the new mechanic measured, you DO need a shim.
Whatever you say buddy...carry on...

Andrew
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Old 10-25-2018, 10:05 PM
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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.
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Old 10-28-2018, 12:46 AM
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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.
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Old 10-28-2018, 01:32 PM
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Originally Posted by Denom View Post
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.
Looks like you have it all figured out...
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