Recently, installed Xlr8 custom clutch kit for my CL-S. Previously, had the stage4 clutchmaster in there.

First impressions: Great quality, slightly heavier than the CM stage 4, perfect fitment.

I decided to go with Xlr8 clutchkit because the CM4 was too harsh for daily driving. xlr8 clutch feels and reacts identical to stock. After the initial break in period, had the car tuned and the clutch held up to 378whp.

Josh - sorry for the delay on the review. Thanks for a great product!

https://imagizer.imageshack.us/v2/24...c/198/ope1.jpg
https://imagizer.imageshack.us/v2/38...0/801/tml6.jpg
https://imagizer.imageshack.us/v2/240xq90/c/12/p9uk.jpg
https://imagizer.imageshack.us/v2/24...c/843/dl6u.jpg

 

What was included in this clutch? Also are you s/c? You should update your sig lol.

 

He's boosted via turbo. ThinJim's old kit I believe?

 

correct, Turbo'd w/ thinjims kit.

The Clutch Kit comes complete. Josh at excelerate will have better info. I had it dropped shipped to my mecahnic.

Sig will be updated soon...

 

Thanks for posting up. I was wondering how this turned out. Any more feedback you can provide would be great. We will finally be able to launch this product in full force now that we have proper feedback.

 

There is about 2k miles on it. Mostly highway miles and nothing to aggressive. The occasional downshift when the freeway opens up and it been holding just fine. Very amazed at how "stock" it feels. Did not change the engage point like the CM kit did.

 

Price?

 

I might buy this for my next setup. Interested in longer term results.

 

Ditto. And can it be used w/ a lightweight flywheel?

 

We're trying to finalize all the info now that we have proper feedback. So we the clutch kits available with flywheel, without flywheel, and we're working on a setup that may work with the factory flywheel. Here is what we have so far:

The prices for the XLR8 clutch kits will be as follows:

$1300 Stage 1 organic disc 480 wtq
$1450 Stage 2 kevlar disc 500 wtq
$1650 Stage 3 organic/feramic disc 525 wtq (this is what the OP has)
$1800 Stage 4 puck style/ or any other custom disc 550+ wtq

All of these kits will include a 20lb single mass aluminum flywheel, 2500 lb non self adjusting conversion pressure plate, 6 spring aftermarket design friction disk, throw out bearing, and alignment tool.

The kits for the OE flywheel will be $350 dollars less (to be verified). The stages with the different material will be for daily divers, endurance drivers and drag racers respectively. The tq numbers are estimations.

So the question will be: Why is your kit more expensive than CM's kit?

The CM kit only uses a 14 lb aluminum flywheel; our flywheel is 20 lbs. The CM pressure plate is only 2200 lbs; ours is a 2500 lb pressure plate. The CM clutch kit doesn't hold as much power as ours and it's pucked. If you want streetability you want our kit b/c it uses a full faced disc and it holds more power. All in all you will have less pedal effort and more holding capacity with less chatter and better components.

 

Is the flywheel your offering your own new piece or a rebranded piece ?
Is this flywheel available separately,and whats the price. ?

 

Hardly affordable, not surprising

 

Just out of curiosity what does the oem flywheel weigh?

 

I believe there is only 1-2 companies selling aftermarket flywheels on the market. Honestly, we don't source the flywheel ourselves. It's sourced by the company who builds the clutch kits for us. I can get separate pricing if you like. PM me.

We weren't going for the cheapest product on the market; we were going for the best product on the market.

I forget offhand. Perhaps the OP can weigh his original flywheel.

 

I read up the oem flywheel is 47 lbs FYI.

 

AASCO flywheel is about 12-14 lbs, so the flywheel must not be from them. I believe Clutchmasters uses the AASCO flywheel though.

 

Are you sure.
I was looking at a LuK OEM replacements and from what I've seen they are way lighter than 47lbs

 

can someone enlighten me on the difference between dual and single mass flywheels?

I assume both would be a rougher engagement if used with with oem clutch?

Edit, RP: i was just curious yesterday and was looking up old threads. I think it was a post by rush that said it was 47lbs, but i can't verify that for certain.

 

I think the Luk is about 30-31lbs.
I think the dual mass likes a unsprung hub and the single mass would prefer a sprung hub or engagement will be too harsh.
I could be totally wrong because I have only recently been trying to read up on clutches and flywheels

 

A dual mass is essentially a two piece flywheel designed to dampen vibration in the driveline.

http://www.zf.com/brands/content/en/...dmf_SACHS.html

Problem

The engine‘s ignition-induced rotational speed irregularity causes torsional vibration in the vehicle‘s driveline. At a given speed the ignition frequency is equal to the natural frequency of the driveline so that extremely high vibration amplitudes occur that cause transmission rattle and body boom.

Solution

In the SACHS planetary dual mass flywheel, the planetary gear and the torsional damper are incorporated into the flywheel. For this purpose, the flywheel is divided into a primary and a secondary mass, hence the name „planetary dual mass flywheel”. Rattle and booming noise are now a thing of the past.



The issue with dual mass flywheels is they do come apart over time, they are not as durable as single mass flywheels, they are expensive, and they are very difficult to re-machine (very few companies can re-machine them properly).

A single mass flywheel can be mated with a clutch kit capable of holding much more torque, is less expensive, can be resurfaced or on some flywheels just have a replacement friction ring, and are generally lighter weight. Because of the lighter weight though you can get some "clutch chatter", basically some noise at low RPMs generally from the transmission area. Also when you convert to a single mass flywheel you run a sprung disc, whereas with a dual mass flywheel you run a solid disc.