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single Mass Flywheel.
- Thread starter Nova2k7
- Start date
Paulwirral
Active member
I've had them on a couple of cars , they usually cause a rattle at tick over and low revs , or chatter as some people call it . Not had one on a bmw mind .
pokeybritches
Member
I wouldn't do one for the price you mentioned... it's too low for it to be a quality unit. I have the Bimmerworld stage 1 setup. It includes a JB Racing lightweight aluminum flywheel, and a Clutchmasters organic sprung hub clutch. It holds fine with my uprated 9 psi VF Engineering supercharger / methanol injection setup, so no need to go with a higher (less driveable) stage. Kevlar ruins when it overheats, but an organic clutch will retain its properties once cooled. So, stick with an organic clutch unless you truly need a kevlar clutch.
By the way, you MUST get a sprung hub clutch if you are going with a single mass flywheel.
My setup has chatter at idle. I'm going to raise the idle rpm soon, but that hurts gas mileage.
Driveability is amazing with this setup. I have a full review on Zpost. Clutch pedal is about 40% stiffer, so that could be an issue depending on who's driving.
By the way, you MUST get a sprung hub clutch if you are going with a single mass flywheel.
My setup has chatter at idle. I'm going to raise the idle rpm soon, but that hurts gas mileage.
Driveability is amazing with this setup. I have a full review on Zpost. Clutch pedal is about 40% stiffer, so that could be an issue depending on who's driving.
It depends why you are considering a SMF? If it's part of a package of track/serious road upgrades then a good quality unit is fine.
If you are considering it on cost grounds only, apart from ruining refinement with fluttery idle/chatter and poor clutch/gearchange quality (which aren't the best on the Z4 anyway) you remove the DMF torque cushioning on the engine and drive-train and risk serious damage. The DMF is an expensive bit of engineering, if a single gave better performance with no downsides you can be sure it would be standard fit.
If you are considering it on cost grounds only, apart from ruining refinement with fluttery idle/chatter and poor clutch/gearchange quality (which aren't the best on the Z4 anyway) you remove the DMF torque cushioning on the engine and drive-train and risk serious damage. The DMF is an expensive bit of engineering, if a single gave better performance with no downsides you can be sure it would be standard fit.
pokeybritches
Member
^ I would agree with most, except the gear shifting and clutch action improved significantly. It's a night and day difference. That's the main reason I would recommend this mod, because the engagement is precise and direct. All the slop is eliminated, yet the organic sprung hub clutch still has enough give to avoid shocking the drivetrain with rough on/off action. With a lightened flywheel, you can get away with shifting faster because the revs fall quickly. Even when you screw up and don't rev match well, there is less rotating mass so less energy is transmitted through the drivetrain.
The only thing that concerns me is the oil pump nut on the M54B30. A lightweight flywheel can increase the likelihood of it occurring.
The only thing that concerns me is the oil pump nut on the M54B30. A lightweight flywheel can increase the likelihood of it occurring.
gaffer1986
Member
pokeybritches said:^ I would agree with most, except the gear shifting and clutch action improved significantly. It's a night and day difference. That's the main reason I would recommend this mod, because the engagement is precise and direct. All the slop is eliminated, yet the organic sprung hub clutch still has enough give to avoid shocking the drivetrain with rough on/off action. With a lightened flywheel, you can get away with shifting faster because the revs fall quickly. Even when you screw up and don't rev match well, there is less rotating mass so less energy is transmitted through the drivetrain.
The only thing that concerns me is the oil pump nut on the M54B30. A lightweight flywheel can increase the likelihood of it occurring.
I agree, I find cars with a single mass fly wheel will always have a crisper gear change and moving off from a standstill quickly is much easier than the springy dual mass fly wheel. How loud is the chatter on the S54 engine with a single mass flywheel?
pokeybritches
Member
My single mass flywheel is on my non-M. It's somewhat loud. It's quiet when the car is cold, but it sounds like a diesel when the transmission is warm.
The whole kit incl clutch for £300?!?
Is he talking about the valeo kit? Thats the only kit I can imagine being sold for that price (unless it's a used unrefurbished kit...)
(I see everyone assuming it's some high spec alu light unit from a tuner etc... but he gives no info whatsoever. the valeo kit is somewhat different....)
Is he talking about the valeo kit? Thats the only kit I can imagine being sold for that price (unless it's a used unrefurbished kit...)
(I see everyone assuming it's some high spec alu light unit from a tuner etc... but he gives no info whatsoever. the valeo kit is somewhat different....)