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      08-19-2020, 01:51 PM   #1
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335is/550i Clutch Torque Limit

Has anyone with the 335is/550i clutch experienced slipping? What were your mods, and how much torque were you putting down? I've heard anywhere from 500-600wtq (assuming dynojet numbers).
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      08-19-2020, 02:05 PM   #2
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Has anyone with the 335is/550i clutch experienced slipping? What were your mods, and how much torque were you putting down? I've heard anywhere from 500-600wtq (assuming dynojet numbers).
I was told do not go over 500 foot pounds with it. Went with a Spec 2+ and an aluminum flywheel.
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      08-20-2020, 08:04 AM   #3
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I was told do not go over 500 foot pounds with it. Went with a Spec 2+ and an aluminum flywheel.
Thanks. I'm wondering if anyone actually has first hand experience with it, because it seems like the actual 550i guys are good with bolt on tunes putting out more than that.
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      08-20-2020, 10:51 AM   #4
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Originally Posted by kern417 View Post
Thanks. I'm wondering if anyone actually has first hand experience with it, because it seems like the actual 550i guys are good with bolt on tunes putting out more than that.
Are you talking about e60 550i ? I have this clutch. I don’t think is good for over 500tq.
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      08-20-2020, 03:27 PM   #5
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Quote:
Originally Posted by feuer View Post
Are you talking about e60 550i ? I have this clutch. I don’t think is good for over 500tq.
F10 550i with the N63. Same clutch as 6MT 335is.
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      08-20-2020, 04:53 PM   #6
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I am also curious, I have the same clutch and will be installing RB twos very shortly. I'm hoping I'll be able to make it work/ maybe tune out some of the torque.
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      08-21-2020, 08:37 AM   #7
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I am also curious, I have the same clutch and will be installing RB twos very shortly. I'm hoping I'll be able to make it work/ maybe tune out some of the torque.
I'm thinking of keeping it below 500-550wtq should be safe. even 500wtq translates to over 650whp at redline. And then no need to go to some heavy twin disk clutch. I also see a lot of big turbos holding power better because they are slightly laggier. Just hoping someone can provide some real world feedback.
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      08-23-2020, 02:24 AM   #8
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I have this clutch with the tuner lightweight flywheel and dyno'd at 491 WTQ @3980 on a dyno race Italian dyno. Holds fine and tbh I believe it could possible hold up to 550 WTQ
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      08-23-2020, 07:43 AM   #9
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As long as you stick with MHD OTS maps, these clutches hold fine. Once you go upgraded turbos or single turbo you need a better one...
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      08-24-2020, 06:39 AM   #10
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Quote:
Originally Posted by ErvGotti View Post
I have this clutch with the tuner lightweight flywheel and dyno'd at 491 WTQ @3980 on a dyno race Italian dyno. Holds fine and tbh I believe it could possible hold up to 550 WTQ
Thank you, this is the kind of data I'm looking for. Some people think since our cars are lighter than it can hold that high even if it might not be "rated" for that torque in a 5 series. Hopefully more people have similar feedback.
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      08-24-2020, 11:00 PM   #11
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kern, you got feedback from feuer and me. If > 500 wtq, look elsewhere. This has been hashed out years ago when I was looking for a proper fit. Just trying to save you further effort and $$$ 20 K miles from now when it starts slipping.
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      08-25-2020, 10:06 AM   #12
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Quote:
Originally Posted by Ozzie335i View Post
kern, you got feedback from feuer and me. If > 500 wtq, look elsewhere. This has been hashed out years ago when I was looking for a proper fit. Just trying to save you further effort and $$$ 20 K miles from now when it starts slipping.
Honestly replacements are free through FCP anyway, I just want to play that dangerous game of approaching fuel pump/clutch limits with larger turbos on my B58. Unfortunately everyone either stays stock turbo or goes to a clutch that holds 800+tq and I'm just trying to get more data in the middle ground.
I have an idea working out with my tuner, just wanted more data if people actually experienced clutch slip with higher hp levels. I can easily reduce torque in the tune if I do go past the clutches' capabilities. It's just nice to have some info in advance.
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      09-07-2020, 02:35 PM   #13
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Finally got my car on a dyno and I'm right at 500wtq. There are also OTS maps for the B58 running 550wtq+, so I think it's safe to say the 550i clutch can handle it. Hope that helps anyone in the future that's looking for this info.

My Dyno


OTS E30 map (I've ran it for a few weeks with no issue)
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      09-10-2020, 11:16 AM   #14
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I had MMP turbos on a 335is clutch kit and made 625whp/630wtq. It held fine at various power levels over 550wtq for 20k miles. I sold the car, last I heard clutch was still fine.
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      09-10-2020, 01:24 PM   #15
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I’m at 380-390tq, about 3-4y and 35k on this clutch and occasionally slips, but I have 120tw tires.
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      09-10-2020, 03:35 PM   #16
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I’m at 380-390tq, about 3-4y and 35k on this clutch and occasionally slips, but I have 120tw tires.
I recognize that plays a big effect on it too. Currently on regular summer tires but moving to some 200tw soon. so we'll see.
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      09-12-2020, 12:28 PM   #17
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limit is 21psi ON E85 AND 13 degrees of timing advance. It didn't even last 5k miles.
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      09-12-2020, 03:43 PM   #18
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limit is 21psi ON E85 AND 13 degrees of timing advance. It didn't even last 5k miles.
What that ad up to? 500tq/hp at the wheels?
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      09-12-2020, 08:07 PM   #19
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Quote:
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What that ad up to? 500tq/hp at the wheels?
It would depend on the turbos if stock. No. If upgraded maybe.

Also depends on the driving style and tires. If the car got launched. Ect...
too vague to take seriously especially when ive heard of owners with 550wtq using this clutch no problems
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      09-12-2020, 09:14 PM   #20
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It would depend on the turbos if stock. No. If upgraded maybe.

Also depends on the driving style and tires. If the car got launched. Ect...
too vague to take seriously especially when ive heard of owners with 550wtq using this clutch no problems
Yes, I totally agree. This is like that long thread on how long clutch should last. The results will vary.
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      09-14-2020, 03:31 PM   #21
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The whole point was to see who's put some miles on their clutches, because if it's truly over the limit then it won't last long. I have a b58. The E30 OTS map on our engine runs 19+psi and 14+ timing and plenty of guys are handling it fine with the 550i clutch. On our cars it makes 550wtq. My E85 tune runs 18+ timing up top, but torque drops off with the stock turbo regardless.

Now I'm looking into upgraded turbos that can hold the torque, so just wanted an indicator on how I can keep it safe for my 550i clutch until I'm ready to upgrade everything. I think I found the answer I was looking for.
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      09-15-2020, 01:35 AM   #22
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Quote:
Originally Posted by ErvGotti View Post
I have this clutch with the tuner lightweight flywheel and dyno'd at 491 WTQ @3980 on a dyno race Italian dyno. Holds fine and tbh I believe it could possible hold up to 550 WTQ
How do you like the turner flywheel?
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