is flywheel decrease torque ?
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Evolving Member
Joined: Jan 2006
Posts: 133
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From: CA
is flywheel decrease torque ?
my IX is 12.000km. I want to change my clutch. Im thinking to buy ACT street clutch kit and 10LBS prolite flywheel.
some of my friends said that : flywheel is not necessary and decrease torque... but I want because I like to feel fast revs...
advices please???
some of my friends said that : flywheel is not necessary and decrease torque... but I want because I like to feel fast revs...
advices please???
Let me preface this by saying that I am far from an engineer but to my understanding a lighter flywheel doesn't decrease torque. The weight of a flywheel reflects how it will react when you disengage the clutch. A heavier flywheel will continue to rotate more than a lower weight flywheel due to inertia when the clutch is disengaged and no throttle is applied. The lighter flywheel will rotate faster and slow down faster with throttle response, while the heavier one will take a tad longer to increase or decrease it's rate of rotation with the same throttle application.
However, the "drawbacks" are that under drag race conditions, having a lighter flywheel can lead to loss of boost pressure, as the heavier flywheel will continue to spin faster longer thus holding boost between shifts and at launch. This is probably what your friend is referring to, but it is not a loss of torque.
The lighter flywheel will allow, IMHO, easier downshifts with revmatching made smoother due to it's lighter weight. I do prefer a lighter flywheel myself, though my old car that had a significantly lighter flywheel than stock (Toyota Celica GT-s, went from 14lbs to 9lbs) was a significantly lighter car. Though blipping the throttle brought a satisfying sweep of the rpm range, and made revmatching for downshifting a joy.
In my Evo, i recently put in an Exedy Twin Plate HD clutch, that comes with a lighter than stock flywheel as well (iirc 11.5lbs). It is quite noticeable to me, but I became accustomed to it very quickly because of my previous experience with a lighter clutch/flywheel combo. The lighter flywheel will require you to rev the engine up a little bit higher than normal as you first engage gear due to it's tendancy to want to respond so quickly and as you are generally feathering the throttle on first during daily driving, this can lead to the flywheel slowing down faster than a heavier flywheel during initial engagement, resulting in the embarrassing stall unless you adjust your driving style heh.
However, the "drawbacks" are that under drag race conditions, having a lighter flywheel can lead to loss of boost pressure, as the heavier flywheel will continue to spin faster longer thus holding boost between shifts and at launch. This is probably what your friend is referring to, but it is not a loss of torque.
The lighter flywheel will allow, IMHO, easier downshifts with revmatching made smoother due to it's lighter weight. I do prefer a lighter flywheel myself, though my old car that had a significantly lighter flywheel than stock (Toyota Celica GT-s, went from 14lbs to 9lbs) was a significantly lighter car. Though blipping the throttle brought a satisfying sweep of the rpm range, and made revmatching for downshifting a joy.
In my Evo, i recently put in an Exedy Twin Plate HD clutch, that comes with a lighter than stock flywheel as well (iirc 11.5lbs). It is quite noticeable to me, but I became accustomed to it very quickly because of my previous experience with a lighter clutch/flywheel combo. The lighter flywheel will require you to rev the engine up a little bit higher than normal as you first engage gear due to it's tendancy to want to respond so quickly and as you are generally feathering the throttle on first during daily driving, this can lead to the flywheel slowing down faster than a heavier flywheel during initial engagement, resulting in the embarrassing stall unless you adjust your driving style heh.
Thread Starter
Evolving Member
Joined: Jan 2006
Posts: 133
Likes: 0
From: CA
Let me preface this by saying that I am far from an engineer but to my understanding a lighter flywheel doesn't decrease torque. The weight of a flywheel reflects how it will react when you disengage the clutch. A heavier flywheel will continue to rotate more than a lower weight flywheel due to inertia when the clutch is disengaged and no throttle is applied. The lighter flywheel will rotate faster and slow down faster with throttle response, while the heavier one will take a tad longer to increase or decrease it's rate of rotation with the same throttle application.
However, the "drawbacks" are that under drag race conditions, having a lighter flywheel can lead to loss of boost pressure, as the heavier flywheel will continue to spin faster longer thus holding boost between shifts and at launch. This is probably what your friend is referring to, but it is not a loss of torque.
The lighter flywheel will allow, IMHO, easier downshifts with revmatching made smoother due to it's lighter weight. I do prefer a lighter flywheel myself, though my old car that had a significantly lighter flywheel than stock (Toyota Celica GT-s, went from 14lbs to 9lbs) was a significantly lighter car. Though blipping the throttle brought a satisfying sweep of the rpm range, and made revmatching for downshifting a joy.
In my Evo, i recently put in an Exedy Twin Plate HD clutch, that comes with a lighter than stock flywheel as well (iirc 11.5lbs). It is quite noticeable to me, but I became accustomed to it very quickly because of my previous experience with a lighter clutch/flywheel combo. The lighter flywheel will require you to rev the engine up a little bit higher than normal as you first engage gear due to it's tendancy to want to respond so quickly and as you are generally feathering the throttle on first during daily driving, this can lead to the flywheel slowing down faster than a heavier flywheel during initial engagement, resulting in the embarrassing stall unless you adjust your driving style heh.
However, the "drawbacks" are that under drag race conditions, having a lighter flywheel can lead to loss of boost pressure, as the heavier flywheel will continue to spin faster longer thus holding boost between shifts and at launch. This is probably what your friend is referring to, but it is not a loss of torque.
The lighter flywheel will allow, IMHO, easier downshifts with revmatching made smoother due to it's lighter weight. I do prefer a lighter flywheel myself, though my old car that had a significantly lighter flywheel than stock (Toyota Celica GT-s, went from 14lbs to 9lbs) was a significantly lighter car. Though blipping the throttle brought a satisfying sweep of the rpm range, and made revmatching for downshifting a joy.
In my Evo, i recently put in an Exedy Twin Plate HD clutch, that comes with a lighter than stock flywheel as well (iirc 11.5lbs). It is quite noticeable to me, but I became accustomed to it very quickly because of my previous experience with a lighter clutch/flywheel combo. The lighter flywheel will require you to rev the engine up a little bit higher than normal as you first engage gear due to it's tendancy to want to respond so quickly and as you are generally feathering the throttle on first during daily driving, this can lead to the flywheel slowing down faster than a heavier flywheel during initial engagement, resulting in the embarrassing stall unless you adjust your driving style heh.
thanks for your excellent info man!!
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