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      10-15-2012, 03:04 PM   #1
JamesM3M5
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Another clutch thread - 335is upgrade?

Hi all,

Just had some clutch slip this past weekend with 3 people and luggage in the car. Been reading the reviews on the ACT, Spec, and HPF clutches.

BUT, what about the 335is clutch? BMW part number 21 20 7 603 248, retails for $460. It is different from the early 335i clutch, part number 21 20 7 567 623, $490 retail. Also different is the 1M clutch, 21 21 7 603 250, $460 retail.

The N54T engine (1M, 335is) uses a 6-bolt flywheel. Will that make a difference in which clutch fits? If the 'is' or 1M clutch fits, anyone think that will be a good upgrade? I am not interested in drag racing, just street driveability and road course use (not hard on the clutch), and I am planning on upgrading to the FlexFuel setup.

Any advice is welcome.
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      10-15-2012, 03:18 PM   #2
cstavaru
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If you are not interested in drag racing, any upgraded clutch will do, even the stock one.
Since no clutch company has different clutches for the 8-bolt and 6-bolt flywheels you can assume that it doesn't matter, BUT at least the 1M flywheel is different from the regular 135i/335i 6-bolt flywheel, it is not a plug-and-play replacement, so it may be possible that the clutch is different too.

If you are not going to drag race I think you are safe with an ACT Street (around $430).
It didn't last me long with LSD and slicks doing drag racing, although it lasted 3 times as a new OEM clutch under the same conditions (ACT - 10.000km, OEM - 3500km). I think it's a good clutch if you use it reasonably.
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      10-15-2012, 03:28 PM   #3
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Yeah, I saw your review + update. Good info all around.

I am cheap and getting old and cranky. I'd hate to have a clutch that shudders or performs poorly if it's more expensive than stock. Heavier than stock actuation isn't a big concern, but your review mentioned that the ACT got softer with age/break-in.

Meh, I dunno. Maybe I'll get the stock to save some money. I get big discounts on dealer parts
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      10-15-2012, 03:30 PM   #4
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To add to what cstavaru mentioned, I'm using the ACT clutch and it's been holding OK on the street. I did three drag nights but on street tires. Clutch held up nicely, no smell no nothing. Of course with an LSD and slicks it's a different story.

Also I'm making tons of torque on stock turbos with E50 and meth. I probably did ~80 runs in 3rd gear in high load conditions in the past months during the e-tune. Still finalizing my tune... Clutch held great
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      10-15-2012, 03:44 PM   #5
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I was going to say price is simlilar but then again you get discounts on OEM

ACT did soften quite a bit. TBH though, I drove my friend's car with stock clutch and pedal did feel much lighter than my car. ACT feels much better! I felt like the stock was not going to go back up once I pressed it down lol

You get used to it, it's not annoying
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      10-15-2012, 10:51 PM   #6
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Send a message via AIM to ar design
From what you described, the ACT Street is probably the best option. Shoot me a Pm for pricing on the clutch + OEM hardware kit that cannot be beat
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      10-16-2012, 08:11 PM   #7
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I have the ACT which is great and held on the Dino (470wtq) where the stock clutch slipped.

That being said, with LSD and drag radials, it slipped badly. I can still smell it periodically when driving hard. I'm thinking of going spec 2+ once more reviews are available.

Quote:
Originally Posted by cstavaru View Post
If you are not interested in drag racing, any upgraded clutch will do, even the stock one.
Since no clutch company has different clutches for the 8-bolt and 6-bolt flywheels you can assume that it doesn't matter, BUT at least the 1M flywheel is different from the regular 135i/335i 6-bolt flywheel, it is not a plug-and-play replacement, so it may be possible that the clutch is different too.

If you are not going to drag race I think you are safe with an ACT Street (around $430).
It didn't last me long with LSD and slicks doing drag racing, although it lasted 3 times as a new OEM clutch under the same conditions (ACT - 10.000km, OEM - 3500km). I think it's a good clutch if you use it reasonably.
Are you sure the 1M FW isn't compatible with the 6-bolt 335 one? I have a 6 bolt and couldn't find anything that was decisive and didn't want to make a $1k gamble.
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      10-17-2012, 05:46 AM   #8
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Quote:
Originally Posted by The Ghost View Post
Are you sure the 1M FW isn't compatible with the 6-bolt 335 one? I have a 6 bolt and couldn't find anything that was decisive and didn't want to make a $1k gamble.
Yes I am. I know from someone who tried it. The flywheel needed a hardware modification to fit, it eventually fit but I don't know any other details.
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      10-23-2012, 05:12 PM   #9
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Hey, we sold a Sachs Performance clutch for 1M and it fits....
Then the FW must be the same for these cars, maybe
LUK said the the FW for 135i, 335i are the same and there is installed the same Sachs Performance clutch.
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