[jpsimon]

SPEC is now offering a steel flywheel that i think is 22lbs vs the 14lbs one. Should be a little less noisy

[tcw]

Originally Posted by jpsimon

SPEC is now offering a steel flywheel that i think is 22lbs vs the 14lbs one. Should be a little less noisy

They also have a 25lb steel flywheel that mates with SAC clutches like the stock clutch. It mates with their line of clutches that also mate with the DMFW.

It is in the lower table:
http://www.specclutch.com/cars/BMW/335/2008/Single

[blackbeast06]

Originally Posted by shiv@vishnu

I'd say the silent majority are level headed. It's just a relatively small, but vocal group that like to hear themselves talk but have really nothing useful to say. But they give each other positive reinforcement which promotes their behavior. It's good for the rest of us since they waste their time with drama while the rest of us learn and do what it takes to make our cars fast

+++++++++++++++++++++++++++++++1

[Gugs]

Originally Posted by jpsimon

SPEC is now offering a steel flywheel that i think is 22lbs vs the 14lbs one. Should be a little less noisy

Interesting. I can't stand the DMFW. Was the same in my e39. Im willing to take on some vibration if it helps with the annoying chatter that the DMFW produces after the springs wear a little.

Anyone have a single video clip at idle and normal take off?

[ChuckD05]

Originally Posted by Gugs

Interesting. I can't stand the DMFW. Was the same in my e39. Im willing to take on some vibration if it helps with the annoying chatter that the DMFW produces after the springs wear a little.

Anyone have a single video clip at idle and normal take off?

chatter of a single mass fly wheel will be 20x louder

[ign335i]

Stock DMFW doesn't chatter unless it has an issue. Mine is completely silent.

[Joshboody]

My DMFW is chattering at idle... been this way for awhile. Also a lot of drivetrain noise now while dis/engaging the clutch, which I assume is due to worn DM. Clutch is still holding though.

[JD75]

Originally Posted by Gugs

Interesting. I can't stand the DMFW. Was the same in my e39. Im willing to take on some vibration if it helps with the annoying chatter that the DMFW produces after the springs wear a little.

Anyone have a single video clip at idle and normal take off?

What you are hearing in the first half of the vid, is the car idling without the clutch depressed and air conditioning off.

Then following a few jabs of the throttle the air conditioning is turned on, as the engine comes back to idle.

Obviously the gear rattle is just a "little" more audible.

The SMFW "chatter" or resonance you hear and slightly feel from the transmission, when cruising at partial throttle between 1,500 & 2,500 rpm, is affected by the use of the AC. But it is no where near as dramatic as the gear rattle you get at idle, with the AC on versus off.

It's not particularly pleasant, but it is what it is. My previous DMFW was reasonably new and quite silent, it was replaced whilst doing a HPF "Feramic" face clutch upgrade that ended badly.

[NjRep335i]

Originally Posted by JD75

What you are hearing in the first half of the vid, is the car idling without the clutch depressed and air conditioning off.

Then following a few jabs of the throttle the air conditioning is turned on, as the engine comes back to idle.

Obviously there is just a "little" more audible gear rattle.

The SMFW "chatter" or resonance you hear and slightly feel from the transmission, when cruising at partial throttle between 1,500 & 2,500 rpm, is affected by the use of the AC.

It ain't great but it is what it is, my previous DMFW was reasonably new and quite silent, it was replaced whilst doing a HPF "Feramic" face clutch upgrade that ended badly.

Car sounds wicked nice... Minus the gear chatter... This is with the spec clutch and flywheel setup? Is it the Flywheel that is compatible with the stock clutch, wonder if there is a difference or not.

No offense, I just got rid of my wastegate rattle and not sure I can take this chatter in place of it (personal opinion).

[JD75]

Originally Posted by NjRep335i

Car sounds wicked nice... Minus the gear chatter... This is with the spec clutch and flywheel setup? Is it the Flywheel that is compatible with the stock clutch, wonder if there is a difference or not.

No offense, I just got rid of my wastegate rattle and not sure I can take this chatter in place of it (personal opinion).

Haha, thanks mate.

The whistle of the RB turbos, combined with ar catless downpipes and Berk Technology exhaust, certainly makes for a nice note.

The flywheel is Advan's 22 lb chromoly steel unit, at that stage I had a HPF "Feramic" face Stage 2 clutch in the car, before it welded at the drag strip.

Any single mass flywheel, whether it be a 14 lb aluminium item or a full weight steel flywheel is going to induce gear rattle at idle, no two ways about it.

The lighter flywheel will be worse, but the 22 lb steel flywheel still made the gearbox sound like there was a bucket of bolts rattling around in there at idle, at least with the AC on.

Increasing idle speed by 250 rpm markedly improves it, but I cannot do that with the PROcede tune I use.

[themyst]

Originally Posted by JD75

Haha, thanks mate.

The whistle of the RB turbos, combined with ar catless downpipes and Berk Technology exhaust, certainly makes for a nice note.

The flywheel is Advan's 22 lb chromoly steel unit, at that stage I had a HPF "Feramic" face Stage 2 clutch in the car, before it welded at the drag strip.

Any single mass flywheel, whether it be a 14 lb aluminium item or a full weight steel item is going to induce gear rattle at idle, no two ways about it.

The lighter flywheel will be worse, but the 22 lb steel flywheel still made the gearbox sound like there was a bucket of bolts rattling around in there at idle, at least with the AC on.

Increasing idle speed by 250 rpm markedly improves it, but I cannot do that with the PROcede tune I use.

You can change the idle speed with INPA.

[JD75]

Originally Posted by themyst

You can change the idle speed with INPA.

Wow, cool!

I just found a YouTube vid demonstrating just that.

This will come in very handy when the car is finally running again, with the new single mass flywheel and twin-plate clutch.

Cheers mate.

[Jeff@TopGearSolutions]

I feel bad for you guys that have to suffer with that chatter. It's quite ridiculous. I would raise the idle at any cost to avoid that racket.

[Joshboody]

I emailed Spec and have a little better understanding of the options... Jeff please confirm.

Factory configuration:
uses step flywheel with ratcheting pressure plate assembly. disc is sprung and you can choose from LWFW or stock DMFW

Spec Config:
non-ratcheting design with flat flywheel. Dimensions are different so have to use Spec flywheel / clutch combo. Disc is sprung also I believe.

Supposedly the spec design is better for capacity and higher rpms.

ACT does NOT retain the ratcheting pressure plate correct?

Jeff, what are most people purchasing... stock or spec design?

The video above is a 22lbs LWFW and Spec's FW is about 22lbs also... Spec says no chatter, but that's hard to believe... it is a different design though.

Man, I want more info... reviews... anyone. I'm a little worried about Spec's rep also after doing a little search, but seems to be good results recently... maybe they improved the quality.

[DallasBoosted]

How much does the DMFW weigh?

[jippii ensio]

The car sounds louder when revving than in idle, correct? So logically idle is less of a problem.

[The Ghost]

Originally Posted by Jeff@topgearsolutions

I feel bad for you guys that have to suffer with that chatter. It's quite ridiculous. I would raise the idle at any cost to avoid that racket.

Have anyone confirmed this fixes the rattle?

[themyst]

Originally Posted by The Ghost

Have anyone confirmed this fixes the rattle?

Rev the car to 900 rpm see if the sound goes away. If it doesn't, the answer is no. I have an auto so I have no first hand experience.

[Joshboody]

Originally Posted by themyst

Rev the car to 900 rpm see if the sound goes away. If it doesn't, the answer is no. I have an auto so I have no first hand experience.

not the same... reving the car puts a constant load on the drivetrain. Idle is bouncing around increasing/reducing torque.

[cn555ic]

I heard the chatter and it sounds very similar to wastegate rattles!lol

[The Ghost]

Originally Posted by themyst

Rev the car to 900 rpm see if the sound goes away. If it doesn't, the answer is no. I have an auto so I have no first hand experience.

I have the DMFW, so I'm waiting for a non-rattling SMFW solution (idle, etc.) before I get one.

[Gugs]

Originally Posted by The Ghost

I have the DMFW, so I'm waiting for a non-rattling SMFW solution (idle, etc.) before I get one.

Will never happen. Good luck waiting. While your waiting learn about how a DMFW works and youll understand why a single will never be as quiet/chatter free as a dual. Never