[e90Mark]

Originally Posted by Daily Three

my issue is i've never seen the 335is clutch in person.. so while the 335i and xi clutches are the same.. i don't know if the pressure plate itself is larger? possibly will not fit with the xi.. OP can you post a pic of the components if you have em?

Interesting. Didn't think about the PP.

Originally Posted by Jeff@TopGearSolutions

The Spec RWD clutches also fit the Xi.

Right, which is why I'm wondering if the IS clutch will fit on the XI, just based on a loose assumption with Spec.

[2jzn54]

Originally Posted by e90Mark

Interesting. Didn't think about the PP.

Pretty sure the IS pressure plate shouldn't be an issue so this should be a direct fit on the xi.. Really don't wanna be the guy testing this out, but I may just end up doin so... There really should be no issue here.

[Subaru335i]

Well if it doesnt work Im sure you would have no trouble selling the IS clutch kit.

[2jzn54]

right, but the wasted labor cost is not worth the risk.

[Myrder]

It should work, the units were identical (the i to the is PP). I have more images on my home computer so maybe i can host some on sunday.

[gwhite92]

My stock clutch is slipping & ready to go out anytime soon. I bought this upgraded pen from ecs tuning but have been hesitant on installing due to not knowing if it will hold up compared to a stage 2/3. Bottom line is, will this clutch hold for someone running fbo & e85?

If not, ill just sell it and get a stage 2

[Myrder]

Originally Posted by gwhite92

My stock clutch is slipping & ready to go out anytime soon. I bought this upgraded pen from ecs tuning but have been hesitant on installing due to not knowing if it will hold up compared to a stage 2/3. Bottom line is, will this clutch hold for someone running fbo & e85?

If not, ill just sell it and get a stage 2

sorry bud, can't answer that as I am not running hybrids. All i can say is check out some tuned 550i numbers and see what tq they are running along with the fact they have about 500lbs more weight to move.

[gwhite92]

Originally Posted by Myrder

sorry bud, can't answer that as I am not running hybrids. All i can say is check out some tuned 550i numbers and see what tq they are running along with the fact they have about 500lbs more weight to move.

I neither am running hybrids..just stock twins fbo/e85
Given the mileage you put on yours..is it safe to say it will hold stock turbos fbo? Thanks in advance.

[Myrder]

Originally Posted by gwhite92

I neither am running hybrids..just stock twins fbo/e85
Given the mileage you put on yours..is it safe to say it will hold stock turbos fbo? Thanks in advance.

I can say in my opinion this clutch will hold FBO power levels. Based on what 550i's make tuned and the weight they have. I am not completely FBO but I am not having any slipping with 18lbs or more of boost.

[Ddang06]

^how many miles did you put on this clutch already ?

[Myrder]

little over 7k.

[2jzn54]

ended up having this installed on our 335xi.. works fine and the car is FBO no e85.. only has 3-4k miles but holds fine. i'm not sure its rated for anything crazy but its a nice oem replacement. If you have the cash and are gonna push the car/hp levels just go aftermarket clutch/flywheel and be done with it no sense in paying twice.

That said.. my 335i which has been FBO for years and has been running heavy e85 mixes back to 2012 i think? has somehow been fine on the OEM clutch for 50k FBO miles.. jynx'd myself i know

[jippii ensio]

Originally Posted by Daily Three

ended up having this installed on our 335xi.. works fine and the car is FBO no e85.. only has 3-4k miles but holds fine. i'm not sure its rated for anything crazy but its a nice oem replacement. If you have the cash and are gonna push the car/hp levels just go aftermarket clutch/flywheel and be done with it no sense in paying twice.

That said.. my 335i which has been FBO for years and has been running heavy e85 mixes back to 2012 i think? has somehow been fine on the OEM clutch for 50k FBO miles.. jynx'd myself i know

I have yet to see this 335is / 550i clutch to fail.

[DuDai]

Originally Posted by Daily Three

ended up having this installed on our 335xi.. works fine and the car is FBO no e85.. only has 3-4k miles but holds fine. i'm not sure its rated for anything crazy but its a nice oem replacement. If you have the cash and are gonna push the car/hp levels just go aftermarket clutch/flywheel and be done with it no sense in paying twice.

That said.. my 335i which has been FBO for years and has been running heavy e85 mixes back to 2012 i think? has somehow been fine on the OEM clutch for 50k FBO miles.. jynx'd myself i know

My friends is holding 600wtq+ just fine and 500-550whp just fine for 40,000km on the IS clutch. It can hold quite the power.

[Miller335]

Originally Posted by DuDai

My friends is holding 600wtq+ just fine and 500-550whp just fine for 40,000km on the IS clutch. It can hold quite the power.

Well that just muddied the cutch waters for me further.
I don't understand how some guys are able to push well past the torque rating for whatever clutch they go with.

[DuDai]

Originally Posted by Miller335

Well that just muddied the cutch waters for me further.
I don't understand how some guys are able to push well past the torque rating for whatever clutch they go with.

Dinan uses it on their Stage 3 550i's actually. And those are rated at 550hp and 587tq. And i'm sure they wouldn't be pushing it to the very limits. They usually like to keep things very safe.

[C.Pop]

Those Dinan numbers are crank numbers though, not whp/wtq... right? Thought Dinan posted crank numbers. Anyone get a dyno on a Dinan stage 3 550i? lol

[DuDai]

Originally Posted by C.Pop

Those Dinan numbers are crank numbers though, not whp/wtq... right? Thought Dinan posted crank numbers. Anyone get a dyno on a Dinan stage 3 550i? lol

Actually they are using it on the Stage 6 software as well which is an additional 15-20hp. Stage 3 550i's are in the mid 12 second 1/4 mile times @ 115-120mph fairly consistently. And they have 1000lbs on our car you have to remember. That clutch has to hold up against a lot more weight on that car!

[2jzn54]

Originally Posted by jippii ensio

I have yet to see this 335is / 550i clutch to fail.

Originally Posted by DuDai

My friends is holding 600wtq+ just fine and 500-550whp just fine for 40,000km on the IS clutch. It can hold quite the power.

to both of you i never said it couldn't hold the power i just don't know any of the data points behind it.. even what its rated for.. we just got it because we bought the car with a slipping clutch, wanted the cheapest option and this seemed like a nice oem upgrade (and it has been).

The stock clutch (not IS) sure isn't rated for FBO, but mine has held up just fine for 50k+ miles of FBO and E85 plus the other 35k miles prior to that.. many out there find their stock clutches slipping with FBO or less and with far less miles.. I beat on my car 24/7, but usually not from a dead dig. I also don't frequent the strip, but I imagine if I did my stock clutch would be fried. We've only had the IS clutch on our other car for a few k miles and that car isn't pushed nearly as hard.. Very nice OEM upgrade just personally haven't seen it really stress tested.

..So for the guys who are running it harder than myself (or if you've heard from your friends) with at least FBO I'd like them to comment on their long term experience.. really lookin for the feedback from guys who regularly launch with radials/slicks.. theres some guys who are doing 100s of passes a year, it'd be nice to get their feedback.

There is a reason none of the ST guys run it because there has to be a cut off with what it can hold (and what's attainable with the oem DMF).. and if they do run it enlighten me because that would be sweet to have that option for us penny pinchers!

@DuDai what kind of driving does your friend do? If he's at the strip often that is great news.

[euro92]

Originally Posted by DuDai

Dinan uses it on their Stage 3 550i's actually. And those are rated at 550hp and 587tq. And i'm sure they wouldn't be pushing it to the very limits. They usually like to keep things very safe.

I got in touch with a rep at Dinan and asked if the factory clutch was adequate for their stage 3 550i. His response was they haven't really done much testing on the MT 550i's since the majority of their clients are automatics. Also, he couldn't say just how long the OEM clutch would last on those stage 3 550i's.

Assuming 15% drivetrain loss, those 550's are making ~470/500 @ the wheels on a car weighing 4417lbs
In terms of 335i, that could potentially translate to ~580/620 @ the wheels on a car weighing 3510lbs**
**I'm going off of a simple ratio, there's nothing scientific about these numbers.

So it can hold the power but the bigger question is for how long? 550i clutch may be cheaper but it could end up costing more depending on longevity...

All that said, does anyone have any idea how long this clutch will last at 650+wtq? (Stage 2+ and Single Turbo figures)

[DuDai]

Originally Posted by Daily Three

@DuDai what kind of driving does your friend do? If he's at the strip often that is great news.

Not at the strip. But he has done about 5-10 track days per summer. That's been 2 summers now or two years. So 15 track days i'd say to play it safe.

He doesn't baby it exactly while driving around town. But he doesn't BEAT on it either as in hard launches dumping the clutch. As well his boost is limited in the first two gears via JB4 so its not taking as hard of beating there. More like factory 335i 8psi in first gear and I think 14psi in 2nd gear if I remember correctly. After that its free for all full boost.

[DuDai]

Originally Posted by euro92

All that said, does anyone have any idea how long this clutch will last at 650+wtq? (Stage 2+ and Single Turbo figures)

Why don't you try it out and let us know? Whats the worst that could happen? For all we know you may end up surprised and it may hold fine for long time.