LS9 vs LS9R vs LS9X - what are the differences?
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Joined: Oct 2005
Posts: 13,975
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From: Clinton Township MI
C7 of Year Finalist (track prepared) 2019
I have the ls9r and love it no more peddle stick and a nice responsive/informative clutch feel if that makes sence. I beat the car to death making over 600hp and run bald drs for the past year. I've slipped it probably over 100+ times on the street and track and can still pull good 60s. I've dumped the clutch mulitple times also and it holds a sticky tire, so it seems to be the best of both worlds. Also not a calf workout when in traffic and no twin disk chatter. There are plenty of 700+p zr1s tracking there car on the stock ls9 cutch without a problem but why not just get the lighter and stronger one while your in there. Hope this helps! 
Instructor
Joined: Sep 2010
Posts: 244
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From: Cleveland Mississippi
I have the ls9x clutch in mine haven't taken it to the dragstrip to test it but I am on the 18th. So far though with me beating on it on the street it is holding really well. I get a slight bit of clutch shudder if i don't modulate the throttle and clutch release just right off the line normal driving.
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Le Mans Master
Joined: May 2011
Posts: 5,022
Likes: 18
From: Tampa FL (formerly Justinjor)
Tech Contributor
St. Jude Donor '11-'12-'13-'14
My stock clutch holds/held my 494whp and lets me get 1.50 60 foots. Without sounding like a huge jerk, your car isn't making anywhere close to stock ZR1 power so I'd expect the LS9 clutch to hold up to anything you can throw at it. If you were making 460 motor and 600 on bottle, I could see the need for a 'track test', but as it sits right now, that clutch is overkill for what you have, unless you're planning something huge in the future.
I guess I could update the OP--it turns out my clutch is fine, and it just got overheated due to not enough water in the water box. I did a 2nd gear burnout, like always, but the super sticky Mickeys held too strong and ended up glazing the clutch disc. Since that OP, from weeks ago, I've gotten a new PR of 10.7@128 with a 1.50 60ft. Nothing on the car changed and the clutch is holding just fine. I've adjusted my burnout technique and I have since put 10 more passes on the car without issue.
I guess I could update the OP--it turns out my clutch is fine, and it just got overheated due to not enough water in the water box. I did a 2nd gear burnout, like always, but the super sticky Mickeys held too strong and ended up glazing the clutch disc. Since that OP, from weeks ago, I've gotten a new PR of 10.7@128 with a 1.50 60ft. Nothing on the car changed and the clutch is holding just fine. I've adjusted my burnout technique and I have since put 10 more passes on the car without issue.
Tech Contributor
Joined: Jul 2002
Posts: 14,950
Likes: 265
From: St. Louis, MO
St. Jude Donor '08
By the way, as a data point, I once glazed my clutch doing a second-year burnout in my C-5. Ever since then, in my c6, I do only first-year burnouts. I now have 60,000+ miles, and 460 hard launches on my stock clutch. I think a first gear burnout is all you need to do.
Thread Starter
Le Mans Master
Joined: May 2011
Posts: 5,022
Likes: 18
From: Tampa FL (formerly Justinjor)
Tech Contributor
St. Jude Donor '11-'12-'13-'14
I do my burnouts for 3-4 seconds in 2nd gear 5500-6000, compared to your 8 seconds in first gear at redline. Your burnouts are at an indicated 40mph, mine are at 70mph for roughly half the time.
Shouldn't that indicate equal wear/tear on the clutch? I know you have a ton more miles on yours, but I honestly thing the biggest reason for my issue was the lack of water in the waterbox and the sticky tires on board. I need a line lock too, that would help, but I think the clutch will hold out for a little while longer.
Instructor
Joined: Sep 2010
Posts: 244
Likes: 0
From: Cleveland Mississippi
My stock clutch holds/held my 494whp and lets me get 1.50 60 foots. Without sounding like a huge jerk, your car isn't making anywhere close to stock ZR1 power so I'd expect the LS9 clutch to hold up to anything you can throw at it. If you were making 460 motor and 600 on bottle, I could see the need for a 'track test', but as it sits right now, that clutch is overkill for what you have, unless you're planning something huge in the future.
I guess I could update the OP--it turns out my clutch is fine, and it just got overheated due to not enough water in the water box. I did a 2nd gear burnout, like always, but the super sticky Mickeys held too strong and ended up glazing the clutch disc. Since that OP, from weeks ago, I've gotten a new PR of 10.7@128 with a 1.50 60ft. Nothing on the car changed and the clutch is holding just fine. I've adjusted my burnout technique and I have since put 10 more passes on the car without issue.
I guess I could update the OP--it turns out my clutch is fine, and it just got overheated due to not enough water in the water box. I did a 2nd gear burnout, like always, but the super sticky Mickeys held too strong and ended up glazing the clutch disc. Since that OP, from weeks ago, I've gotten a new PR of 10.7@128 with a 1.50 60ft. Nothing on the car changed and the clutch is holding just fine. I've adjusted my burnout technique and I have since put 10 more passes on the car without issue.
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Thread Starter
Le Mans Master
Joined: May 2011
Posts: 5,022
Likes: 18
From: Tampa FL (formerly Justinjor)
Tech Contributor
St. Jude Donor '11-'12-'13-'14
lol im not worried if its gonna hold or not im just wanting to see how its manners are gonna be when i launch it at 5k+. I doubt I have any problems out of it at my power level im at right now. Now when I get my heads and throw some nitrous on here i might be worried about it.
Tech Contributor
Joined: Jul 2002
Posts: 14,950
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From: St. Louis, MO
St. Jude Donor '08
It's funny that you check my logs! Good to know I'm consistent.
I have had it happen withy c5 that I thought I was doing a burnout, and I could see smoke, but it was my clutch not my tires. Like the YouTube video that someone did in the z06. Therefore ever since then I've only done first gear burnouts and it's worked out well so far.
Pretty much zero risk that you will burn the clutch and not the tires when doing a first-gear burnout.
I have had it happen withy c5 that I thought I was doing a burnout, and I could see smoke, but it was my clutch not my tires. Like the YouTube video that someone did in the z06. Therefore ever since then I've only done first gear burnouts and it's worked out well so far.
Pretty much zero risk that you will burn the clutch and not the tires when doing a first-gear burnout.
Thread Starter
Le Mans Master
Joined: May 2011
Posts: 5,022
Likes: 18
From: Tampa FL (formerly Justinjor)
Tech Contributor
St. Jude Donor '11-'12-'13-'14
It's funny that you check my logs! Good to know I'm consistent.
I have had it happen withy c5 that I thought I was doing a burnout, and I could see smoke, but it was my clutch not my tires. Like the YouTube video that someone did in the z06. Therefore ever since then I've only done first gear burnouts and it's worked out well so far.
Pretty much zero risk that you will burn the clutch and not the tires when doing a first-gear burnout.
I have had it happen withy c5 that I thought I was doing a burnout, and I could see smoke, but it was my clutch not my tires. Like the YouTube video that someone did in the z06. Therefore ever since then I've only done first gear burnouts and it's worked out well so far.
Pretty much zero risk that you will burn the clutch and not the tires when doing a first-gear burnout.
That Z06 video is so sad.. "bye bye tires" he says...
I just prefer a 2nd gear burnout to heat em up and I just make sure I pay attention to the waterbox and how wet the tires are actually getting when rolling through the box.
