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      09-27-2013, 06:38 AM   #1
RimasRS
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Question Which Flywheel for FBO car DMF or SMF?

Hey there

My clutch is going to the end, mostly I drive in the city I decided to go with SPEC stage2+ clutch kit as it is good for FBO power levels and still comfy on the street/traffic.
Now my question which FLYWHEEL single mass oem or dual mass stainless steel?
Please advice me which version to choose will oem flywheel is ok for 350-400whp or it will fail again?
Anybody did single mass share your experience. how noisy it is?

Thanks
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      09-27-2013, 09:14 AM   #2
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go with oem dmfw if your going to keep torque limit under say 450-475 ish
anything higher and you might want to consider a steel smfw from spec.
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      09-27-2013, 04:56 PM   #3
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Also curious to hearing this as I'm in the same situation. That 450-475 torque seems to be right at the border between what a FBO + e85 (which is my setup) would be at, and what an upgraded turbo setup could produce.
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      09-27-2013, 08:30 PM   #4
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reused my stock flywheel with this clutch. seems good for FBO e30-40%. have not gone any higher than that yet ..
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      09-27-2013, 09:14 PM   #5
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SMFW if you planning on making any more power... which im sure if your planning on spending 2k on clutch/flywheel and install you are
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      09-27-2013, 09:38 PM   #6
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Quote:
Originally Posted by RimasRS
Hey there

My clutch is going to the end, mostly I drive in the city I decided to go with SPEC stage2+ clutch kit as it is good for FBO power levels and still comfy on the street/traffic.
Now my question which FLYWHEEL single mass oem or dual mass stainless steel?
Please advice me which version to choose will oem flywheel is ok for 350-400whp or it will fail again?
Anybody did single mass share your experience. how noisy it is?

Thanks
Remember the misfires caused at high rpms for Rb and singles with DMFW.

Lighten SM flywheel is a lot lighter and feels great. Just be prepared for ChATTEr
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      09-29-2013, 02:39 AM   #7
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Thanks guys really appreciate
For now I am thinking to leave stock turbos because still I want to do meth and exhaust but after that I dont know will I stop... In the beginning I thought I will do just tune + fmic but you only finish moding when you sell the car
Anyway I think I will stay with DMF even though mine is dead and I need a new one. I would hate to drive slowly in the city and people would look at you thinking WTF is wrong with your car...
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      09-29-2013, 03:50 AM   #8
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Quote:
Originally Posted by Presidio335xi View Post
Remember the misfires caused at high rpms for Rb and singles with DMFW.

Lighten SM flywheel is a lot lighter and feels great. Just be prepared for ChATTEr

Fotr how much is sm lighter than DM???
Is it really crucialy beneficical???
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      09-29-2013, 08:48 AM   #9
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I'd go with a SM steel. I have that with a stg 3+ no issues. Doesn't really chatter that much.
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      09-29-2013, 09:42 AM   #10
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I re-used my DMFW with my Horepower Freaks Stage 1 clutch without any issues and I am doing 460+ WHP and 533 WTQ. I just resurfaced it. I wanted to maintain stock driveablity as possible. No issues with here.
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      09-29-2013, 10:13 AM   #11
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Quote:
Originally Posted by joec500 View Post
I re-used my DMFW with my Horepower Freaks Stage 1 clutch without any issues and I am doing 460+ WHP and 533 WTQ. I just resurfaced it. I wanted to maintain stock driveablity as possible. No issues with here.
how long have you been running this set up ? I have the dmfw (new) and the stage 2+on its way .running 440/505 and was thinking im pushing it ! but im in the same boat as others chatter is not an option .
either way obviously is not changing my mind but would love to hear how its held up for you.
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      09-29-2013, 11:41 AM   #12
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Quote:
Originally Posted by joec500 View Post
I re-used my DMFW with my Horepower Freaks Stage 1 clutch without any issues and I am doing 460+ WHP and 533 WTQ. I just resurfaced it. I wanted to maintain stock driveablity as possible. No issues with here.
That's what I did (with a HPF Stage 2 clutch) for about 15k miles. Thought I had no issues. And I'm running RB turbos on a E50 mix with 500+ WHP.

However 2 months ago the stock DMFW completely disintegrated while doing a full throttle 6th gear acceleration @ 120+ mph, and it almost destroyed my transmission and my crank shaft at the same time as well. Had to have repairs made to the gear box. The HPF Stage 2 clutch however survived. My original DMFW had about 85k miles on it when it happened.

I now run a SPEC stage 3+ clutch and a SPEC steel SMFW, and after breaking it in I can certainly say that this is what I should have done in the first place. So much easier to launch the car properly every time, and chatter isn't really anything to worry about IMO. Everyday driveability isn't really an issue either, not for me at least.

In retrospect I had way too many concerns about going for a SMFW solution in the first place, the SPEC combo really works great. Of course I have only used it for 2k miles yet, but many others have used it for a long time without issues.
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      09-29-2013, 12:10 PM   #13
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+1 for spec steel smfw
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      09-29-2013, 12:57 PM   #14
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I have 13k miles on my spec stg3+ with spec steel flywheel and i can say the clutch takes all the abuse i throw at it. The steel flywheel is chattery especially with the ac on, and it's very grabby. If you don't mind the chatter you'll love the spec combo....
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      09-30-2013, 04:30 AM   #15
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Quote:
Originally Posted by 3000GT MR View Post
I'd go with a SM steel. I have that with a stg 3+ no issues. Doesn't really chatter that much.
Well some people report really loud chatter. Really again it confuses me..

Quote:
Originally Posted by joec500 View Post
I re-used my DMFW with my Horepower Freaks Stage 1 clutch without any issues and I am doing 460+ WHP and 533 WTQ. I just resurfaced it. I wanted to maintain stock driveablity as possible. No issues with here.
How long you have this setup?

Quote:
Originally Posted by G.I.Joe View Post
That's what I did (with a HPF Stage 2 clutch) for about 15k miles. Thought I had no issues. And I'm running RB turbos on a E50 mix with 500+ WHP.

However 2 months ago the stock DMFW completely disintegrated while doing a full throttle 6th gear acceleration @ 120+ mph, and it almost destroyed my transmission and my crank shaft at the same time as well. Had to have repairs made to the gear box. The HPF Stage 2 clutch however survived. My original DMFW had about 85k miles on it when it happened.

I now run a SPEC stage 3+ clutch and a SPEC steel SMFW, and after breaking it in I can certainly say that this is what I should have done in the first place. So much easier to launch the car properly every time, and chatter isn't really anything to worry about IMO. Everyday driveability isn't really an issue either, not for me at least.

In retrospect I had way too many concerns about going for a SMFW solution in the first place, the SPEC combo really works great. Of course I have only used it for 2k miles yet, but many others have used it for a long time without issues.
Damn that should be scary. So it broke in two parts? How did you repaired your box where did you get new parts for it?
I know that going 500whp+ would really be better to go SMF but for me not really sure.

Would like to hear in person how loud is the chatter. And what about real feeling in the car is it like a truck almost I mean how would you rate from 1-10 points comparing with stock setup
Noise 1-10
Vibrations 1-10
Pedal smoothness 1-10
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      09-30-2013, 01:39 PM   #16
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Quote:
Originally Posted by RimasRS View Post
Damn that should be scary. So it broke in two parts? How did you repaired your box where did you get new parts for it?
I know that going 500whp+ would really be better to go SMF but for me not really sure.
It was quite scary, I was pulling on a M6 Grand Coupe at the time (for the 4th time) going through Germany. The flywheel broke in about 20 parts, so when I say disintegrated, it really was like that....

I had my local shop do all the repairs, they had to dismantle another gear box to get the parts.

Quote:
Would like to hear in person how loud is the chatter. And what about real feeling in the car is it like a truck almost I mean how would you rate from 1-10 points comparing with stock setup
Noise 1-10
Vibrations 1-10
Pedal smoothness 1-10
Chatter is only present when you have the MT in neutral and the clutch is released. Press down the clutch and there is nothing. Idle is super smooth, only a little more vibration during acceleration (almost like when adding E85 and the engine runs a little more roughly), it revs faster (it really can be noticed), and the pedal feel is smooth, you need a little more throttle than with the DMFW, but pedal pressure is less than with my HPF Stage 2 clutch and the stock DMFW.

If anyone near you runs a SPEC Stage 3+ (or 2+) with a steel SMFW you should ask for a ride/drive.
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Last edited by G.I.Joe; 09-30-2013 at 01:44 PM.. Reason: spelling
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      09-30-2013, 01:47 PM   #17
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Quote:
Originally Posted by cwarren View Post
go with oem dmfw if your going to keep torque limit under say 450-475 ish
anything higher and you might want to consider a steel smfw from spec.
Agree

i have a Spec 3+ clutch and a SMFW and Love it
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      09-30-2013, 08:49 PM   #18
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Quote:
Originally Posted by RimasRS View Post
Noise 1-10
Vibrations 1-10
Pedal smoothness 1-10
1 being stock

Noise - 7-8 with AC on / 4-5 AC off (but understand it is only when in neutral at a light or stop sign. My wife and mom both thought something was wrong with my car when they first heard it FWIW. Consider a 10 the worse waste gate rattle you have ever heard.

Vibrations 3-4 (reverse and 1st gear in the morning, not once warmed up then 1-2) Needs more throttle to engage but you will learn to like it better, especially when being aggressive/launching

Pedal Smoothness - 2 shorter engagement point near the top the peddle. It is quite firmer than stock but nothing major and again you will get use to it.


I will also add you will notice the steel SMFW will rev quicker and drop quicker in between shifts, thus allowing quicker shifts.
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      10-01-2013, 08:42 AM   #19
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Quote:
Originally Posted by 09BMW335i View Post
Agree

i have a Spec 3+ clutch and a SMFW and Love it

Is it a great difference in noise and comfort,cnmpare stage2 to stage3+???

Or all spec products are noisy??
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      10-01-2013, 10:08 AM   #20
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500+ WHP SMFW
Anything less should be able to get away with the DMFW.

We recommend a new OEM DMFW as historically we've seen many horror stories of the DMFW not being resurfaced correctly.

As mentioned above the SMFW will have some chatter. If you opt for a DMFW and make in excess of 500WHP+ there is potential for your vehicle to throw misfires codes.

Well sell many spec clutches a week. If you have any questions I'd be happy to answer them.

You should choose a clutch based on your torque. Not what others are running.
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      10-01-2013, 10:39 AM   #21
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Quote:
Originally Posted by Jeff@TopGearSolutions View Post
500+ WHP SMFW
Anything less should be able to get away with the DMFW.

We recommend a new OEM DMFW as historically we've seen many horror stories of the DMFW not being resurfaced correctly.

As mentioned above the SMFW will have some chatter. If you opt for a DMFW and make in excess of 500WHP+ there is potential for your vehicle to throw misfires codes.

Well sell many spec clutches a week. If you have any questions I'd be happy to answer them.

You should choose a clutch based on your torque. Not what others are running.
Thanks Jeff helpful as always... So in easy words everything before RB or Vargas I mean turbo upgrades should hold with DMF. How about FBO protune + meth?
What else should I know do when replacing clutch and flywheel?
Any tips?
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      10-01-2013, 11:30 AM   #22
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Quote:
Originally Posted by Jeff@TopGearSolutions View Post
500+ WHP SMFW
Anything less should be able to get away with the DMFW.

We recommend a new OEM DMFW as historically we've seen many horror stories of the DMFW not being resurfaced correctly.

As mentioned above the SMFW will have some chatter. If you opt for a DMFW and make in excess of 500WHP+ there is potential for your vehicle to throw misfires codes.

Well sell many spec clutches a week. If you have any questions I'd be happy to answer them.

You should choose a clutch based on your torque. Not what others are running.

So jeff i'm in the same boat,cause my flywheel ticking after 2-3 launches,so i think that it needs replacement soon.
I'm 335xi FBO +e85, what route to go?
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