XClutch Twin Disk - Group Buy Feeler

Frenchie1013

Lurker
Jun 26, 2017
21
6
0
Ride
335i
I can vouch for Steve in the US. Always responds quickly and has answered a million questions from me. I ordered mine directly from @MFactory on Friday afternoon and it will be here on Thursday. Pretty good in my book.
 

zcchen

Lurker
Nov 19, 2018
18
19
0
Ride
1M
Got my clutch installed. It is street-able but definitely not street-friendly. I got the organic version and I already feel it being to grabby. A smooth take-off is impossible, either slip the clutch and the whole car shakes or dump the clutch and the wheel chirps. However, the pedal pressure is almost as soft as stock, which is very nice considering the amount of TQ it potentially holds. I will try to get a 500 miles break-in before doing a track day and report back. Should be fun.

Here are the weights I thought some of you might be interested. Turns out the weight saving is minimal which is a bummer but i can live with.
Stock Flywheel: 11kg
Xclutch Flywheel: 10kg

Stock assembly: 17.5kg
Xclutch assembly: 16.5kg
BNIB.jpg
Stock.jpg
Stock_Assy.jpg
Stock_Flywheel.jpg
Stock_Friction.jpg
X-Assy.jpg
X_Flywheel.jpg
 

chrisdfv

Corporal
Aug 29, 2017
270
216
0
Ride
E90 335i
Got my clutch installed. It is street-able but definitely not street-friendly. I got the organic version and I already feel it being to grabby. A smooth take-off is impossible, either slip the clutch and the whole car shakes or dump the clutch and the wheel chirps. However, the pedal pressure is almost as soft as stock, which is very nice considering the amount of TQ it potentially holds. I will try to get a 500 miles break-in before doing a track day and report back. Should be fun.

The drivability gets exponentially better with more miles on it.
 
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WOT808

Specialist
Aug 7, 2017
80
56
25
Ride
E90 335i
Installed my organic version this weekend along with an RTD shifter and fresh e46 m3 trans mounts.
60 miles so far

In comparison to the 335is clutch / MFactory SMFW combo I had previously:
  • Neutral/Idle chatter is quieter if not same as before
  • Clutch is 'grabby' but nothing violent when slipped
  • The grab point is higher
  • Clutch pedal feel about the same
  • Gearbox chatter/drone during low rpm/high load situations has increased but I'm attributing some of that to the chassis mounted RTD shifter.
    • Nothing that will drown out music at low volume.
  • Noise when Clutch Pedal is Pressed
    • My only gripe at the moment
    • It sounds like someone is using a miniature chop saw to cut a pipe.
    • Not extremely loud or embarrassing at all just noticeable especially with my stock exhaust.
I'll update after break-in
 

Dreyo27

Corporal
Nov 28, 2016
153
37
0
33
Sacramento
Ride
2007 335i 2008 535i
I got mine on friday. Just dropped it off to get it balanced. I will let you know how it turns out hopefully by the end of the day tomorrow.
 

fmorelli

Lieutenant General
Staff member
Aug 11, 2017
3,748
3,592
0
57
Virginia
Ride
E89 Z4 35i, F10 535d
I got mine on friday. Just dropped it off to get it balanced. I will let you know how it turns out hopefully by the end of the day tomorrow.
Who does the whole assembly balance?

Filippo
 

noorj

Corporal
Jul 12, 2017
140
104
50
Detroit, MI
Ride
'07 E90 335i
Interested in how the balance comes out.

I’ve got 750 miles on my organic, it’s way more streetable as the miles go up. After this much, I would say it’s very similar to the spec stage 3+ but with a lighter pedal. Can’t wait to turn the boost up!
 

chrisdfv

Corporal
Aug 29, 2017
270
216
0
Ride
E90 335i
Interested in how the balance comes out.

I’ve got 750 miles on my organic, it’s way more streetable as the miles go up. After this much, I would say it’s very similar to the spec stage 3+ but with a lighter pedal. Can’t wait to turn the boost up!

Every 500 mi you continue to go up, it gets even better. The grabbiness gets considerably better.
 
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GGMR2T

Private
May 31, 2018
46
8
0
Ride
2007 E90 335i 6mt
Every 500 mi you continue to go up, it gets even better. The grabbiness gets considerably better.

Is it the same for the ceramic version in this regard? I also got mine about a week ago, but I have to pretty much re assemble my entire car so I havent driven on it yet. Soon I hope! I just put mine on in the same way it was sent to me so hopefully that's the way it was balanced (assuming so), but also curious as to how the balance comes out!
 

shushikiary

Sergeant
Jun 4, 2018
304
173
0
Ride
335xi
Yes on the ceramic the experience was the same for me.

Especially the first 50 miles or so it was just silly how grabby it was, but then it got better. I have almost 15,000 miles on mine now and its working great. You cant just pop the clutch unless you want to launch, it will grab. But if you go slow for about 0.75 of an inch right in the middle of the clutch pedal you can get it to start out smooth. Conversely if you want to LAUNCH the thing, it doesn't complain. GC lite 2.0's at 24 PSI with AWD and I can dump the clutch at 4k RPM from the line and it just grabs and goes no complaints.
 
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GGMR2T

Private
May 31, 2018
46
8
0
Ride
2007 E90 335i 6mt
Yes on the ceramic the experience was the same for me.

Especially the first 50 miles or so it was just silly how grabby it was, but then it got better. I have almost 15,000 miles on mine now and its working great. You cant just pop the clutch unless you want to launch, it will grab. But if you go slow for about 0.75 of an inch right in the middle of the clutch pedal you can get it to start out smooth. Conversely if you want to LAUNCH the thing, it doesn't complain. GC lite 2.0's at 24 PSI with AWD and I can dump the clutch at 4k RPM from the line and it just grabs and goes no complaints.

Nice. Very excited. Sounds like we'll have the same set up only I have a RWD. I have an M3 drivetrain ready to go in as well for when I snap an axle haha! A little off topic, but how are you liking the GC 2.0's? I bought mine like 6 mos ago and am just barely getting ready to start the car with them for the first time haha!
 

shushikiary

Sergeant
Jun 4, 2018
304
173
0
Ride
335xi
First note that I'm at 5280 foot altitude.

In the cold, or at sea level the GC 2.0's are unreal. Spool time is nill, at sea level (lincoln nebraska) while getting the tune tweeked right it hit 28PSI at 4k RPM, 50 deg F ambient.

Here at altitude in the cold its like being at sea level, anything under 50 deg F IAT and they spool super fast and get up to my requested 24 PSI no problem by 4k RPM, I limit it to 16 PSI at 3k RPM. Holds 23 or so to red line with about 75% WGDC.

In the hot, aka IAT 90 deg F or above, there starts to be some lag, but its not horrible. At that IAT she works hard to hit 24 PSI by 4k RPM and can hold about 22 to red line at 85% WGDC.

I've already broken one front axle shaft, and the front drive shaft. After replacing those its been doing well.... its stupid how fast the car is. Its a whole other world when you drive the piss out of it... it actually gets scary because you have to really learn to get off the gas early enough to brake to make a corner without too much speed. Vboxed a 0-60 in 3.2 seconds, first gear on a good launch is so short you don't have time to look at the tach, you have to shift by sound/feel.

I had to switch to 255 all around (widest you can go in the front without being very picky about the exact wheel/tire), more so for braking traction than launch traction.
 
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GGMR2T

Private
May 31, 2018
46
8
0
Ride
2007 E90 335i 6mt
First note that I'm at 5280 foot altitude.

In the cold, or at sea level the GC 2.0's are unreal. Spool time is nill, at sea level (lincoln nebraska) while getting the tune tweeked right it hit 28PSI at 4k RPM, 50 deg F ambient.

Here at altitude in the cold its like being at sea level, anything under 50 deg F IAT and they spool super fast and get up to my requested 24 PSI no problem by 4k RPM, I limit it to 16 PSI at 3k RPM. Holds 23 or so to red line with about 75% WGDC.

In the hot, aka IAT 90 deg F or above, there starts to be some lag, but its not horrible. At that IAT she works hard to hit 24 PSI by 4k RPM and can hold about 22 to red line at 85% WGDC.

I've already broken one front axle shaft, and the front drive shaft. After replacing those its been doing well.... its stupid how fast the car is. Its a whole other world when you drive the piss out of it... it actually gets scary because you have to really learn to get off the gas early enough to brake to make a corner without too much speed. Vboxed a 0-60 in 3.2 seconds, first gear on a good launch is so short you don't have time to look at the tach, you have to shift by sound/feel.

I had to switch to 255 all around (widest you can go in the front without being very picky about the exact wheel/tire), more so for braking traction than launch traction.

Sounds like a blast! Yeah, sounds like you're in Colorado? I'm in UT at 4500 which is why I went with the GC's over the lites. I was originally going to go with the lites then chris at vtt talked me into the bigger set so they wouldn't even be breaking a sweat at the 600whp (uncorrected) goal I was shooting for. Now that I'm thinking about it, was it you that I PM'd awhile back about setting up the boost control map in tuner pro for higher altitude?
 

shushikiary

Sergeant
Jun 4, 2018
304
173
0
Ride
335xi
It might have been.

I do run my own PID tunings for this altitude. I've also spent a lot of time trying to get a single tune that will work at both sea level and at altitude. Re-scaling the WGDC base table to go up to 3.0 boost setpoint factor and 500 MAF is very important, because even with TMAP scaling 24 PSI is only seen as about 2.5 boost setpoint factor at sea level, but its 2.9 boost setpoint factor at altitude. Thus by setting your WGDC base values to the right things based on boost setpoint factor and requested MAF, you can then tune a tight PID without it oscillating, and it works at both sea level and altitude.

I've spent many many hours taking logs and adjusting things for sea level and altitude when I drive between the two. One major problem is fuel multiplier. Because the absolute boost pressure is different between the two for the same boost pressure, the PI mappings in the AIC6 need different values for the two altitudes, but you can't do that, so you have to set your fuel scalar to be close and let the short term fuel trims do their work. This means you'll never be able to keep it close to 0 STFT at both locations. I prefer to run 0 at sea level and run negative at altitude as to be safe and run rich rather than lean if you run out of STFT.