Quote:
Originally Posted by nachob
I keep hearing about the dual-mass flywheel being responsible for everything from global warming to jerks, clutch slippage, etc. The dual mass flywheel is actually intended to dampen vibrations between engine and tranmission.
The jerk you feel is probably exacerbated by the LIGHTENED 1M flywheel that has a smaller mass and less inertia. So when you back off the throttle, the motor acts as a brake on the gearbox via the clutch/flywheel. A heavier flywheel has more rotational inertia due the the greater mass and it keeps spinning. That is one reason not every car has a lightened flywheel. It makes the car spool up faster BUT the opposite is true...it decelerates faster.
So what you have to do is learn how to shift. Most distributorless cars nowadays with fly-by-wire throttle have quicker response both on and off throttle. If you take your foot completely off the gas pedal during a shift, the motor has been temporarily shut down. Try keeping a slight bit of throttle during your shift and it should smooth out.
OR you can trade it for a Jaguar! : )
|
A dual mass-flywheel has springs between the two masses in order to reduce vibration at idle and low speeds. When power is suddenly lost at higher speeds, the springs compress due to the difference in engine speed and road/differential speed. The abrupt expansion of these springs accounts for the jerk/jolt/compression felt. At least according to one of the mechanical engineers at BMW's prestigious M Division who stated the symptom is due to a combination of the dual-mass flywheel and the characteristics of the limited slip differential.
If the flywheel itself is the culprit or just transmitting it is not really important. Keeping the throttle applied slightly or very slowly easing off the gas helps reduce the jerk when shifting. However when slowing down, cruising or braking it is sometimes impossible to slowly ease of the throttle and I wouldn't recommend keeping your foot on the gas lightly while braking.
Personally I am extremely happy with my 1M and I don't really care for Jaguars. At the risk of sounding like a d@*#$%, I would say I am pretty good at shifting manual transmission cars and motorcycles and have been doing it successfully on and off the track for the last 10+ years. However I am available for private shifting lessons at the track of your choosing
