Dyno Results / Clutch Replacement

[RobZL1]

I stopped by Vengeance today to see what the car was putting down. Thanks to David, Taylor, and Robert for fitting me in unannounced and taking good care of me and the Z.

The bad news: It looks like the stock clutch is overwhelmed by the raw power of this monsterous beast that GM has bestowed upon us. LOL. (see the graph below)

The good news: The numbers should be really good once I put a decent clutch in there, because even with slipping the numbers look promising. It looks like things start to play nice at the top of the pull, so I'm guessing peak power is pretty close to where it will be with a new clutch.

So which clutch do you guys like? Monster, RPS, other?

Just wanted to share. I'll update once I get it fixed. In the meantime, here's the mod list and dyno graph for the heck of it:

Current list of power mods:
- Rotofab intake
- 28% (10") pulley
- ID850's
- TR7ix plugs/MSD wires
- Stainless Power 1-7/8" headers
- JMS fuel pump booster
- Remote tune by Ted Jannetty

[RobZL1]

Also- is there any way this could just be wheel spin on the roller? I never feel any clutch slipping on the street

[BlackWidow24]

definitely the clutch, the wheels wouldnt spin on a dyno at those hp numbers.

[RobZL1]

It's just weird to me because it doesn't do it on the street. I did a few hits this morning on asphalt in 4th at 2500 and 3000rpm, and there was zero wheel slip or perceivable clutch slip.

I also plotted mph vs rpm from some data logging a month ago, and it was a perfectly straight line.

I have my sct with me. I'm going to get some data today in 4th and see what the mph vs rpm looks like.

[RobZL1]

Did a log today in 4th gear and made a plot of rpm/mph vs rpm to compare to the dyno plot. Also looked at a data file I have from a month ago where I logged in 3rd gear for comparison.

I guess a picture is worth a thousand words (and a clutch is worth a couple thousand dollars... ) Gotta pay to play, but I really thought the stock clutch would hold 650-ish without too much drama. Appears that I was mistaken. DOH!

Anybody have experiences with the Monster LT1-S or any other "reasonably" priced clutch? I don't want to spend 2k+ for just the darn parts (such as RPS).

[KaBoom1701]

I think I'm around 600-620 to the wheels and I swear I feel clutch slipping on the track so I would agree with your findings...

[2NASSTY]

Throw a Monster Triple Disk in there and beat the hell out it. It will take it.

My factory clutch started giving up at the 670 rwhp number after about 30 passes. Great factory clutch. I miss it in some respects.

The Monster is a pure Beasst Man. You will not be disappointed. Great numbers by the way. Perfect street Car at that level.

[camarodude87]

What spoiler do you have? Looks good in the profile pic

[JANNETTYRACING]

Originally Posted by RobZL1

I stopped by Vengeance today to see what the car was putting down. Thanks to David, Taylor, and Robert for fitting me in unannounced and taking good care of me and the Z.

The bad news: It looks like the stock clutch is overwhelmed by the raw power of this monsterous beast that GM has bestowed upon us. LOL. (see the graph below)

The good news: The numbers should be really good once I put a decent clutch in there, because even with slipping the numbers look promising. It looks like things start to play nice at the top of the pull, so I'm guessing peak power is pretty close to where it will be with a new clutch.

So which clutch do you guys like? Monster, RPS, other?

Just wanted to share. I'll update once I get it fixed. In the meantime, here's the mod list and dyno graph for the heck of it:

Current list of power mods:
- Rotofab intake
- 28% (10") pulley
- TR7ix plugs/MSD wires
- Stainless Power 1-7/8" headers
- JMS fuel pump booster
- Remote tune by Ted Jannetty

Congrats and sorry for your loss at the same time LOL

I guess I gave you a little too much power

Feel free to hit me up on a Monster clutch We will set you up with the right one.

Ted.

[RobZL1]

Originally Posted by KaBoom1701

I think I'm around 600-620 to the wheels and I swear I feel clutch slipping on the track so I would agree with your findings...

Yep. You know, I got to thinking about it last night. I don't really abuse the clutch, but I did try out the launch control and no lift shift features twice... and it was during the time between the data log without slippage, and the log with slip. Maybe that's the final straw that borked the clutch.

Originally Posted by 2NASSTY

Throw a Monster Triple Disk in there and beat the hell out it. It will take it.

My factory clutch started giving up at the 670 rwhp number after about 30 passes. Great factory clutch. I miss it in some respects.

The Monster is a pure Beasst Man. You will not be disappointed. Great numbers by the way. Perfect street Car at that level.

I'm thinking 3-disc organic LT1-S. Sounds like what I need. And thanks! I was hoping for anything between 625 and 650, so I'm pleased. Hopefully it will be a few ponies higher once the clutch is fixed, and obviously the torque curve should jump up, too. It will be fun to see where it ultimately lands.

Originally Posted by camarodude87

What spoiler do you have? Looks good in the profile pic

Thanks! It's an Anderson Composites Z28 carbon fiber piece. The previous owner was wonderfully meticulous and had a body shop go over it and clear it again with UV protectant, so hopefully it will look good for a long time.

Originally Posted by JANNETTYRACING

Congrats and sorry for your loss at the same time LOL

I guess I gave you a little too much power

Feel free to hit me up on a Monster clutch We will set you up with the right one.

Ted.

Thanks! I was very happy with the numbers, considering. 560 peak torque isn't all that bad with a slipping clutch- LOL!

I'll give you a shout soon. Maybe you have an awesome Black Friday deal coming up on a Monster clutch for me???

[JANNETTYRACING]

Originally Posted by RobZL1

Yep. You know, I got to thinking about it last night. I don't really abuse the clutch, but I did try out the launch control and no lift shift features twice... and it was during the time between the data log without slippage, and the log with slip. Maybe that's the final straw that borked the clutch.



I'm thinking 3-disc organic LT1-S. Sounds like what I need. And thanks! I was hoping for anything between 625 and 650, so I'm pleased. Hopefully it will be a few ponies higher once the clutch is fixed, and obviously the torque curve should jump up, too. It will be fun to see where it ultimately lands.



Thanks! It's an Anderson Composites Z28 carbon fiber piece. The previous owner was wonderfully meticulous and had a body shop go over it and clear it again with UV protectant, so hopefully it will look good for a long time.



Thanks! I was very happy with the numbers, considering. 560 peak torque isn't all that bad with a slipping clutch- LOL!

I'll give you a shout soon. Maybe you have an awesome Black Friday deal coming up on a Monster clutch for me???

Any chance you have the log from the dyno session I would like to have a look.

Ted.

[Little Walter]

Originally Posted by RobZL1

Yep. You know, I got to thinking about it last night. I don't really abuse the clutch, but I did try out the launch control and no lift shift features twice... and it was during the time between the data log without slippage, and the log with slip. Maybe that's the final straw that borked the clutch.



I'm thinking 3-disc organic LT1-S. Sounds like what I need. And thanks! I was hoping for anything between 625 and 650, so I'm pleased. Hopefully it will be a few ponies higher once the clutch is fixed, and obviously the torque curve should jump up, too. It will be fun to see where it ultimately lands.



Thanks! It's an Anderson Composites Z28 carbon fiber piece. The previous owner was wonderfully meticulous and had a body shop go over it and clear it again with UV protectant, so hopefully it will look good for a long time.



Thanks! I was very happy with the numbers, considering. 560 peak torque isn't all that bad with a slipping clutch- LOL!

I'll give you a shout soon. Maybe you have an awesome Black Friday deal coming up on a Monster clutch for me???

Guys with all respect not trying to derail the thread topic. My ZL is a automatic, when you mentioned no lift shift in the M6 does this mean you can shift from 1st thru 6th without engaging the clutch? Is there a ignition or fuel kill sensor on the shifter or tranny linkage?

[SynergyGreenSS]

Originally Posted by Little Walter

Guys with all respect not trying to derail the thread topic. My ZL is a automatic, when you mentioned no lift shift in the M6 does this mean you can shift from 1st thru 6th without engaging the clutch? Is there a ignition or fuel kill sensor on the shifter or tranny linkage?

I believe no lift shift means no lifting from the gas. So you can keep the gas floored and just use the clutch

[GONMAD510]

Originally Posted by SynergyGreenSS

I believe no lift shift means no lifting from the gas. So you can keep the gas floored and just use the clutch

This is correct.