After my Spec Stage 3+ clutch started to slip after only 5k miles at 750whp, I was forced to search for another new clutch. The Spec clutch was only rated at 671 tq, I thought it would be capable of holding more power. My search of 1000+ tq rated clutches led me to research twin disc options for the N54.
As some of you might be aware, there is a new twin disc clutch option for those of us with manual N54’s. Xtreme Performance Clutch (or XClutch) is an Australian company that specializes in clutches for performance vehicles overseas. With the recent group buy, I decided to give their clutch a shot given the price is much cheaper than the Motiv or MFactory twin discs.
I have no affiliation with XClutch, but if you want to get in on their group buy, it ends on May 19th (this Sunday): XClutch Twin Disk – Group Buy Feeler | BMW – SpoolStreet
- The organic option (892 ft/lb rating) is $1250 shipped
- The ceramic option (1350 ft/lb rating) is $1350 shipped
I ordered the ceramic version of the clutch, which is capable of holding more torque and is meant for track-driven cars. I received the clutch a few days after ordering and was very impressed with the quality!
- It comes with the following:
- Flywheel bolts
- Pilot bearing
- Throwout bearing (metal)
- Alignment tool (metal)
- Flywheel & clutch assemblies
I couldn’t wait to get it installed! Here is the list of items I replaced while I was in there:
- Transmission Bellhousing Bolts (one-time use)
- Downpipe Gaskets (2)
- Rear Main Seal
- Upgraded Clutch Delay Valve
- Royal Purple Transmission Fluid (2 qts)
- Upgraded Brass Clutch Fork Pivot Pin
- Poly Transmission Mounts
- Clutch Pedal Stop
The recommended break-in mileage is 1000 kilometers (621 miles). This should include mostly city driving where you are frequently using the clutch. Racking up highway miles aren’t going to help break in the clutch. I noticed that the driveability gets better and all noises quiet down a little after 500 miles. It will never be as quiet or as smooth as a stock clutch… but it’s much more capable than the stock clutch.
If you install the metal throwout bearing that is included with the kit, it will produce a metallic whirring noise when the clutch is depressed. This does not bother me, but it might bother some of you who don’t like noise. Please watch my video at the bottom of this post to hear the noise.
The metal throwout bearing included with the kit is recommended and more robust, but this is the OEM-style throwout bearing if you’d like to avoid the noise: https://bit.ly/2Hy6rX3
As with any SMFW or twin disc, you will have low RPM gearbox chatter. While idling and while driving at high load/low RPM, you can hear it. If this bothers you, you will have to stick with an OEM-style DMFW clutch setup. Otherwise, you can raise the idle via MHD to 900 RPMs or so to reduce the chattering.
However, at power levels of 600whp+, the stock DMFW is not recommended and there are not a lot of upgraded clutch options available that mate up to the stock DMFW. I’ve used many different clutch/flywheel setups in these N54s, and have no qualms with the increased noise of a SMFW or twin disc. It’s all part of the game when you’re chasing horsepower!
I knew the ceramic version of the clutch would be a little more difficult to drive than the organic version, so please take that into consideration when reading my review or purchasing the clutch.
The pedal is stiffer/heavier than stock, but not by much. It’s effortless to depress, which is good. Engagement doesn’t happen until the top of the pedal during release. My stock clutch and my Spec Stage 3+ clutch both engaged a lot closer to the floor, so this took some getting used to. Installing the clutch stop helped, but still has a large area of dead space in the pedal. Again, watch my video at the bottom of this post to see how much dead space there is.
Once the engagement starts, the window is fairly small. You don’t have a lot of slipping area, and this can result in a shuttering take-off until you learn the clutch. I’ve heard that the organic version is a little more forgiving in this sense.
The clutch itself is very grabby, just like it should be. I was getting slippage between gears in my old Spec Stage 3+ and this one grabs right away, which is great. I have no concerns about it holding any power I’m capable of making right now (750whp+).
Check out the video I put together of the clutch. It includes an install timelaspe, some driving, and my impressions of the noise/pedal engagement. If you’re into BMWs or N54 stuff, give me a thumbs up on YouTube and subscribe to my channel!
Overall, it takes some getting used to but once you learn the clutch, it’s definitely streetable. I drive my car frequently in the summer and am happy to have a clutch that will hold the power. If you don’t have high power goals, I would recommend the organic version of this clutch. If you plan on making 700wtq+ or more, I would definitely go with the ceramic version.
I hope this post is helpful to those who are considering this clutch, or other high horsepower clutch setups. Please leave a comment below and I’ll do my best to answer them from an enthusiast point of view.