anybody using or has used the sti 5.4kg flywheel.will this give me a rough idle? help please.

 

Changing the flywheel should not affect your idle at all. You will loose some torque.

 

err,

changing to a flywheel of that weight does give a slightly dodgy idle, and the dip on over run can cause it to stall.

dont know where all this stuff about losing torque comes from.

The torque comes fromt the engine burning fuel in a confined space, not from an inanimate lump of metal on the end of the crank shaft.

Can you explain exactly why the engine will lose torque?

 

I made several attempts to explain why ultra light flywheels contribute to the "loss of torque" feeling here ..

http://www.i-club.com/forums/showthread.php?s=&threadid=99148&highlight=flywhee l

I hope cross posting is permitted here.

 

It is basic Physics.

Try here.

http://rpm2.8k.com/basics.htm

 

I have a lightened flywheel - although not down to 5.4kg - seemed a bit pricy to me. Maybe this is why my car will never give over 300ftlb of torque

Also any hunting on idle is greatly exagerated as there is less smoothing.

Trout

 

Lightening a flywheel will affect the idle. The flywheel is largely there to even out the velocity of the crankshaft between detonations. Less mass = less eveningout = rougher idle. However, more mass also = less torque at the wheels as additional energy required to accelerate the flywheel.