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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > well think its time for a new clutch...



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      07-08-2015, 10:22 PM   #1
matthewo
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well think its time for a new clutch...

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Major clutch slip around 4500, guess this 100k mile stock clutch just cannot hold the power, and this was in 3rd gear. 4th gear is usually even worse...

I guess I am not too surprised, kinda expected it...
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      07-08-2015, 10:40 PM   #2
Miller335
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Yea it gets worse the higher the gear your in when those turbos hit their peak power.

I plan on sticking with stock turbos for bit so I went with a 335is clutch and new LUK/OEM DMFW, got 1K miles on it and it's holding all the power with a stock pedal feel pretty happy with the upgrade.

I did the job myself so it makes it that much sweeter.
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2007 E92 335 6MT w/335is clutch FBO MHD E60 Wedge map 49k miles
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      07-08-2015, 10:46 PM   #3
matthewo
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yeah I even heard someone say a guy in Canada was running over 600tq to one for 40,000km, I am sure it wasn't a dmfw, but still says a lot for the clutch. I hope to get some type of upgraded stock frame in the future and be around 525 or 550, basically whatever the limit of the dmfw, because for now its a DD and I cannot live with the chatter.
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      07-08-2015, 11:02 PM   #4
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Have you tried running a little less boost in the midrange to try and mitigate the slip until you can get a new clutch?
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      07-08-2015, 11:13 PM   #5
Miller335
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Quote:
Originally Posted by musc View Post
Have you tried running a little less boost in the midrange to try and mitigate the slip until you can get a new clutch?
Easier said then done.
If his clutch was like mine it would grab fine some days and not others.

Even running the 1/4 it would slip one pass and not another.
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      07-09-2015, 12:58 AM   #6
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I bought the car with a meth kit on it, and it felt pretty strong. the clutch didn't slip then and it was probably tuned right on the edge of slipping i think he had it getting around 19 psi on meth, guestimate is around 410-420whp.

I removed meth and procede and went jb4 with back end and started running e85. it was fine at 40ish %, but when i went with the stage 2 LPFP i also upped it to 70% E85 and ran more boost, and it was just too much for the clutch at that point.

Now im running straight e85, but i think im going lower the boost 1 psi, because at 20psi in the midrange HPFP is really taking a crap, and tweak a few more things to get HPFP up.

Yeah back on E70 ish the clutch wouldn't slip evertime, but now with straight e85 and a deg more timing and maybe a psi more boost it just wont hold anything full throttle in gears 3rd and above.

So yeah the clutch really isn't bad per say i still drive it everyday and its fine, other than a little engagement rattle at times, probably due to an old DMFW or something. and engagement is ok, its pretty long and seems like it can be a bit unpredictable at time. doesn't ever seem like it acts the same, sometimes its nice sometimes not so much.

im not really in much of a hurry unless it lets go bad, i may even try to do a 1/4 mile pass on it before i replace it just so i can launch it and smoke it a little and then replace it all with new.

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      07-09-2015, 02:24 PM   #7
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Quote:
Originally Posted by matthewo View Post
I bought the car with a meth kit on it, and it felt pretty strong. the clutch didn't slip then and it was probably tuned right on the edge of slipping i think he had it getting around 19 psi on meth, guestimate is around 410-420whp.

I removed meth and procede and went jb4 with back end and started running e85. it was fine at 40ish %, but when i went with the stage 2 LPFP i also upped it to 70% E85 and ran more boost, and it was just too much for the clutch at that point.

Now im running straight e85, but i think im going lower the boost 1 psi, because at 20psi in the midrange HPFP is really taking a crap, and tweak a few more things to get HPFP up.

Yeah back on E70 ish the clutch wouldn't slip evertime, but now with straight e85 and a deg more timing and maybe a psi more boost it just wont hold anything full throttle in gears 3rd and above.

So yeah the clutch really isn't bad per say i still drive it everyday and its fine, other than a little engagement rattle at times, probably due to an old DMFW or something. and engagement is ok, its pretty long and seems like it can be a bit unpredictable at time. doesn't ever seem like it acts the same, sometimes its nice sometimes not so much.

im not really in much of a hurry unless it lets go bad, i may even try to do a 1/4 mile pass on it before i replace it just so i can launch it and smoke it a little and then replace it all with new.
Yeah my HPFP doesn't like straight E85 running 21.5-22 in the midrange. I usually mix it at E65. Hoping to get Fuel-its throttle body kit when it comes out to take the strain off the HPFP and run E85 straight.

What part of SC are you in? I'm near Charleston and there are a group of us down this way that try to get together for meets, dynos, track, etc.
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