LPE ZR1 + 20% Clutch / Steel flywheel track tested with 700rwtq – GREAT clutch!
03-12-2010, 02:31 PM
#1
Racer
Thread Starter
LPE ZR1 + 20% Clutch / Steel flywheel track tested with 700rwtq – GREAT clutch!
SHORT story…
Incredible grip / smoooooth engagement / balanced / rock solid.
LONG story…
I’ve been looking too damn long for a solid STREET/STRIP clutch for my 427 twin turbo that would hold the torque and allow a smooth progressive launch. So far, I’ve had crap luck with the aftermarket units. Twice, I've been disappointed at the track (and on the street with the McLeod). If this clutch failed to deliver, I'd post up here about strike 3. As much of a pain it is to swap them out, I'm happy to report that the new LPE ZR1 clutch rocks!
Clutch 1: Excedy Twin (removed after 1000 miles)
- Great street manners
- Smooth engagement
- Slipped BIG on drag radials
Clutch 2: McLeod RXT Street Twin (removed after 2000 miles)
- Chattered on the street
- Tough to modulate
- Slipped a tiny bit at peak torque
- Grabbed too hard to allow smooth launch
Clutch 3: Lingenfelter ZR1 + 20% clutch with LPE Billet Steel Flywheel
After around 1000 street miles an a trip to drag strip, I can honestly say this is an incredible clutch. On 100 octane my car makes 800rwtq and on pump gas it puts out 700rwtq at 3600rpms. With M/T drag radials I slip the clutch to plant the car and ride the torque off the line. It's hell on clutches.
I have found that slipping the clutch off the line keeps the driveline in one piece and with the right technique, it allows the car to plant and smoothly transition into boost. It also makes crazy heat and it’s tough to maintain a proper balance of material and clamping force to allow you to slip off the line but clamp under high load.
While the ZR1 clutch has proven to be VERY capable, the LPE modified pressure plate offers 20% more clamping force than stock with the same smooth engagement. The steel flywheel provides great inertia off the line and makes it easy to be smooth and balanced to plant the car and clamp hard once you are rolling. The feel is very similar to the stock ZR1 unit but I noticed that the additional clamping makes the line between slip/smoke a bit easier to feel. Perfectly predictable..
On a slick track, I was able to consistently slip this clutch from 4-5k rpms and hit 1.6x 60’ foots. I have no doubt that 1.4-1.5’s are within reach with a better track and 10.1-10.2’s at 140+.
From my experience, if you need a OEM street mannered clutch with capacity to slip and HOLD a serious forced induction C6.. This is as good as it gets.
Scott
Incredible grip / smoooooth engagement / balanced / rock solid.
LONG story…
I’ve been looking too damn long for a solid STREET/STRIP clutch for my 427 twin turbo that would hold the torque and allow a smooth progressive launch. So far, I’ve had crap luck with the aftermarket units. Twice, I've been disappointed at the track (and on the street with the McLeod). If this clutch failed to deliver, I'd post up here about strike 3. As much of a pain it is to swap them out, I'm happy to report that the new LPE ZR1 clutch rocks!
Clutch 1: Excedy Twin (removed after 1000 miles)
- Great street manners
- Smooth engagement
- Slipped BIG on drag radials
Clutch 2: McLeod RXT Street Twin (removed after 2000 miles)
- Chattered on the street
- Tough to modulate
- Slipped a tiny bit at peak torque
- Grabbed too hard to allow smooth launch
Clutch 3: Lingenfelter ZR1 + 20% clutch with LPE Billet Steel Flywheel
After around 1000 street miles an a trip to drag strip, I can honestly say this is an incredible clutch. On 100 octane my car makes 800rwtq and on pump gas it puts out 700rwtq at 3600rpms. With M/T drag radials I slip the clutch to plant the car and ride the torque off the line. It's hell on clutches.
I have found that slipping the clutch off the line keeps the driveline in one piece and with the right technique, it allows the car to plant and smoothly transition into boost. It also makes crazy heat and it’s tough to maintain a proper balance of material and clamping force to allow you to slip off the line but clamp under high load.
While the ZR1 clutch has proven to be VERY capable, the LPE modified pressure plate offers 20% more clamping force than stock with the same smooth engagement. The steel flywheel provides great inertia off the line and makes it easy to be smooth and balanced to plant the car and clamp hard once you are rolling. The feel is very similar to the stock ZR1 unit but I noticed that the additional clamping makes the line between slip/smoke a bit easier to feel. Perfectly predictable..
On a slick track, I was able to consistently slip this clutch from 4-5k rpms and hit 1.6x 60’ foots. I have no doubt that 1.4-1.5’s are within reach with a better track and 10.1-10.2’s at 140+.
From my experience, if you need a OEM street mannered clutch with capacity to slip and HOLD a serious forced induction C6.. This is as good as it gets.
Scott
Last edited by BIG GUN; 03-12-2010 at 02:34 PM.
03-12-2010, 04:16 PM
#3
Racer
Thread Starter
Lingenfelter sells the kit for $1499 with everything needed to install in a C6.
The unit I'm running has a upgraded 20% increased pressure plate and should be available soon through LPE. I've driven the stock ZR1 unit on sticky tires at over 730rw and it's a great piece. Incredibly smooth, strong and resilient.
This upgraded design should allow a little more headroom. After fighting and making excuses for my aftermarket clutches, I'm really happy to find something that works.
http://www.lingenfelter.com/mm5/merc...egory_Code=C62
The unit I'm running has a upgraded 20% increased pressure plate and should be available soon through LPE. I've driven the stock ZR1 unit on sticky tires at over 730rw and it's a great piece. Incredibly smooth, strong and resilient.
This upgraded design should allow a little more headroom. After fighting and making excuses for my aftermarket clutches, I'm really happy to find something that works.
http://www.lingenfelter.com/mm5/merc...egory_Code=C62
03-12-2010, 08:06 PM
#4
Racer
Member Since: Jan 2007
Location: forney texas 725rwhp/768rwtq
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Do up have the billet carbon twin ( bc2). Or the street twin carbon. Sorry not trying to highjack your thread. Congrats on the awesome clutch.
03-13-2010, 02:05 AM
#5
Racer
Thread Starter
This clutch has proven itself to me and I really enjoy driving the car more than before. I'll see in the upcoming weeks how far it can be pushed.
03-13-2010, 01:34 PM
#8
Racer
Thread Starter
At the track, I ran some high 6.8-7.0 1/8th mile times but wanted to feel the new clutch out before running it through the traps and getting booted for no roll bar.
I can tell you that this clutch has incredible feel at the dragstrip. I use the brakes to do my burnout in 2nd and it puts some heat in the clutch. On the line, the engagement is linear and starts very low on the pedal which helps me to modulate. The pedal effort is significantly higher than the McLeod but, personally, I prefer some feel on the clutch pedal.
On launch, the clutch slips until you get off the pedal then it locks. Even riding through 700+rwtq as boost hits, it never slipped. I shift at 6000 but logged shifts at 3/10ths with the 6-speed so release is not an issue. I can see any slip on the data logs and it's not there.
Next time out, I'm going to run more boost and hopefully have a better track to test the clutch.
