My LS7 Clutch Observations
Burning Brakes
Joined: Feb 2003
Posts: 1,016
Likes: 0
From: Bristol Ct
Originally Posted by connecticut
Ike, interesting point, i noticed this on a recent LS7 clutch install, next one I'll have to weigh to see what the difference is
Le Mans Master
Joined: Oct 2005
Posts: 7,083
Likes: 1,829
From: Metro Detroit Michigan
Originally Posted by Tony Mamo
Rotating mass is the enemy....robs horsepower and will slow the acceleration of the engine (and make it slightly less responsive).
Not a good set-up if your looking to be a hero on the chassis dyno (or the track)...thats for sure.
Not a good set-up if your looking to be a hero on the chassis dyno (or the track)...thats for sure.
Originally Posted by Tony Mamo
The other negative is that heavy mass single disc clutch will make lightening fast shifts at high RPM much more difficult (which I personally kind of enjoy the challenge of).
Le Mans Master
Joined: Nov 2003
Posts: 8,003
Likes: 249
From: Tampa Fl
St. Jude Donor '12-'13-'14
Here's my 2 cent. I just got my car back with the LS7 set up installed. Ive only got about 140 miles on it so I have not really jumped on it. I doubt my car will see a road race or a track run, and I still think the selection was right for me.
The clutch does grabs a little lower then my stock LS1. I have the adjustable master in, but have not corrected the engaugement level yet. It not a bad engaugement level, it's just a little lower than im used to.
I have gotten on the car at 3/4 throttle once or twice, and it grabs hard. A friend of mine had about 460 HP with 3.90s and it grabs perfect. Its a great clutch for the street car with HP.
The clutch does grabs a little lower then my stock LS1. I have the adjustable master in, but have not corrected the engaugement level yet. It not a bad engaugement level, it's just a little lower than im used to.
I have gotten on the car at 3/4 throttle once or twice, and it grabs hard. A friend of mine had about 460 HP with 3.90s and it grabs perfect. Its a great clutch for the street car with HP.
Race Director
Joined: Dec 2004
Posts: 13,760
Likes: 75
From: Haymarket VA
Originally Posted by phils C5 vette
A friend of mine had about 460 HP with 3.90s and it grabs perfect. Its a great clutch for the street car with HP.
I agree with Tony Mamo, for people wanting a stock feeling clutch that works with extra HP the LS7 is a great choice. I have't found a downside on mine yet after about 5k miles and I do "drive it like I stole it"
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Le Mans Master
Joined: Dec 2000
Posts: 9,896
Likes: 1,836
From: Hot Springs AR
Originally Posted by Warp Factor
A heavy flywheel/pressure plate combo will slow you down on the track only if your launch rpm is lower than your rpm through the traps. Additional mass could even be an advantage with tall gears, poor low-end torque, or excellent traction.
Pressure plate and flywheel mass don't factor into the speed of the shift. The synchros only need to overcome the clutch disc mass.
Have a good one,
Mike
Tech Contributor
Joined: Jan 2004
Posts: 20,030
Likes: 289
From: Wylie TX --> Less is More, except under the hood !
I have a good question for you....
Do you feel that you Lost or Gained any power "Feel" to the wheels with this clutch setup ?
I don't want to install this clutch and find the car "feels" slower because people have said its a heavier clutch set up than the LS6 clutch. I did not listen to guys here about heavier wheel weights affecting my car's performance and I sold the heavy wheels 2 weeks after I got them.
My 04 Z06 has 525HP/500Tq (LG's Heads/Cam/Headers). I can feel the clutch engagement is becomming more and more towards the highest point in the movement. Its time I start thinking about a clutch replacement.
Toque
Do you feel that you Lost or Gained any power "Feel" to the wheels with this clutch setup ?
I don't want to install this clutch and find the car "feels" slower because people have said its a heavier clutch set up than the LS6 clutch. I did not listen to guys here about heavier wheel weights affecting my car's performance and I sold the heavy wheels 2 weeks after I got them.
My 04 Z06 has 525HP/500Tq (LG's Heads/Cam/Headers). I can feel the clutch engagement is becomming more and more towards the highest point in the movement. Its time I start thinking about a clutch replacement.
Toque
Le Mans Master
Joined: Oct 2005
Posts: 7,083
Likes: 1,829
From: Metro Detroit Michigan
Originally Posted by VetteDrmr
Some tracks actually have turns.
Originally Posted by VetteDrmr
A lighter assembly also makes rev matching when downshifting easier.
Originally Posted by VetteDrmr
An engine with a heavier mass flywheel/pp assembly changes rpm more slowly than if a lighter assembly is used. Therefore the syncros have to overcome a larger speed differential between gears.
Mike
Mike
When shifting (at least if you use the clutch when shifting) the transmission and clutch disc are disconnected from the engine, so engine mass isn't a factor. Only clutch disc inertia.
Last edited by Warp Factor; Jul 11, 2006 at 03:32 PM.
