The difference/advantages of a SMF or DMF? Please explain...

[berg]

Hello chaps, can some mechanically minded person explain to me the difference between the two?

Some people on here who have changed to SMF seem to be regretting it due to noise at idle through transmission I presume but a lot of the respected tuners seem to advocate a SMF if you are going over 300bhp as a DMF is at it's limit around that mark?

Could do with some clarification on the issue before I approach more tuners for quotes on clutch and diff.

Many thanks.

[danishmkvgti]

DMF will fail when opping the torque output of the car as the built in shockabsorber isn't able to cope with the amount this engine can be made to produce.
SMF will most likely be more noisy and are not as easy to engage as the DMF due to lack of schockabsorbers, SMF is also lighter so easier revving.

 

[berg]

Cheers Danish - so by that logic am I right in saying if you have a GTI you can go stg2+ and have a DMF but if you want to go to same stage of tune with an ED30 you will have to have SMF to cope with torque? So is the shock absorber like a huge rubber doughnut which absorbs vibration/noise?

[TrickGTI]

Imagine it as two flywheels sandwiched together with rubber inbertween. It's all for vibration and it takes the harshness of the engine and makes everything quiter!

If you put your hands together flat and rub them in different directions that's all a DMF does but only a small amount each way.