performance benefits of lightweight flywheels
05-06-2003, 07:14 AM
#2
Cost Drivers!!!!
less parasitic loss in the drivetrain as it takes less energy to rotate the wheel which connects to your clutch which connects to your gears which drive your wheels 
The engine will rev much faster and more freely. When you tap the accel on downshifts it'll be easier to get the desired RPM. They say it's better for heal-toe.
negatives. Well, they take out the weight which helps to shield your tranny from NVH of the engine.
The engine will rev much faster and more freely. When you tap the accel on downshifts it'll be easier to get the desired RPM. They say it's better for heal-toe.negatives. Well, they take out the weight which helps to shield your tranny from NVH of the engine.
05-06-2003, 08:11 AM
#3
Senior Moderator
Originally posted by Zapata
Well, they take out the weight which helps to shield your tranny from NVH of the engine.
Zapata, I'm proud of you
It's not often that anyone gets to use NVH (noise, vibration and harshness) in a post
Well, they take out the weight which helps to shield your tranny from NVH of the engine.
Zapata, I'm proud of you
It's not often that anyone gets to use NVH (noise, vibration and harshness) in a post
05-06-2003, 08:17 AM
#4
Cost Drivers!!!!
Originally posted by greenmonster
Originally posted by Zapata
Well, they take out the weight which helps to shield your tranny from NVH of the engine.
Zapata, I'm proud of you
It's not often that anyone gets to use NVH (noise, vibration and harshness) in a post
Originally posted by Zapata
Well, they take out the weight which helps to shield your tranny from NVH of the engine.
Zapata, I'm proud of you
It's not often that anyone gets to use NVH (noise, vibration and harshness) in a post
lol, i humbly accept your comments
hehe
05-06-2003, 10:28 AM
#7
Cost Drivers!!!!
Originally posted by Pull_T
Makes it much harder to launch a car when drag racing, IMO...
It in effect, "narrows" the RPM window between bog and spin.
Just .02 from a drag racer's perspective
Makes it much harder to launch a car when drag racing, IMO...
It in effect, "narrows" the RPM window between bog and spin.
Just .02 from a drag racer's perspective
Agreed. Good point PullT. Although i suspect the v8 w/blower you have doesn't help either
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05-06-2003, 11:14 AM
#8
Suzuka Master
+ Effective increase in power (less inertia)
+ Less transmission wear with ability to "slew" the engine faster (Engine speed can increase and decrease at higher rate; this allows for better gear matching.).
+ Effective power gain greater in lower gears (the lower the gear, the greater the "effective gain."
- As mentioned, depending on weight loss of new flywheel, additional vibration and the vibration will generally show up at lower RPM.
- No increase in static power output (won't help much at high speeds where aerodynamic forces are large [ > 100 MPH] )
- Hard to predict advantage/increase in 'effective hp gain' when replacing dual mass flywheel (as is used 03 CLS manual and other cars).
- The drag race issue is not “settled” one way or the other. IOW, just making a flywheel lighter will not necessarily make a car harder to get off the line. It depends... A flywheel can be used as an “energy reserve” – at the starting line while revving -- to store a lot of energy to be dumped into the tires (especially helpful if the car bogs and is RWD). I don’t know how relevant this would be with a FWD street vehicle.
If the car is used for road racing/rally, the drag racing issue is a non-starter and each lb. of mass (weight) lost on a flywheel can equal up to 15 lbs of static weight (think chassis, seats, beer belly).
+ Less transmission wear with ability to "slew" the engine faster (Engine speed can increase and decrease at higher rate; this allows for better gear matching.).
+ Effective power gain greater in lower gears (the lower the gear, the greater the "effective gain."
- As mentioned, depending on weight loss of new flywheel, additional vibration and the vibration will generally show up at lower RPM.
- No increase in static power output (won't help much at high speeds where aerodynamic forces are large [ > 100 MPH] )
- Hard to predict advantage/increase in 'effective hp gain' when replacing dual mass flywheel (as is used 03 CLS manual and other cars).
- The drag race issue is not “settled” one way or the other. IOW, just making a flywheel lighter will not necessarily make a car harder to get off the line. It depends... A flywheel can be used as an “energy reserve” – at the starting line while revving -- to store a lot of energy to be dumped into the tires (especially helpful if the car bogs and is RWD). I don’t know how relevant this would be with a FWD street vehicle.
If the car is used for road racing/rally, the drag racing issue is a non-starter and each lb. of mass (weight) lost on a flywheel can equal up to 15 lbs of static weight (think chassis, seats, beer belly).
05-06-2003, 11:23 AM
#9
Cost Drivers!!!!
EricL,
as always filling in all the nitty gritty details 
as always filling in all the nitty gritty details
Originally posted by EricL
+ Effective increase in power (less inertia)
+ Less transmission wear with ability to "slew" the engine faster (Engine speed can increase and decrease at higher rate; this allows for better gear matching.).
+ Effective power gain greater in lower gears (the lower the gear, the greater the "effective gain."
- As mentioned, depending on weight loss of new flywheel, additional vibration and the vibration will generally show up at lower RPM.
- No increase in static power output (won't help much at high speeds where aerodynamic forces are large [ > 100 MPH] )
- Hard to predict advantage/increase in 'effective hp gain' when replacing dual mass flywheel (as is used 03 CLS manual and other cars).
- The drag race issue is not “settled” one way or the other. IOW, just making a flywheel lighter will not necessarily make a car harder to get off the line. It depends... A flywheel can be used as an “energy reserve” – at the starting line while revving -- to store a lot of energy to be dumped into the tires (especially helpful if the car bogs and is RWD). I don’t know how relevant this would be with a FWD street vehicle.
If the car is used for road racing/rally, the drag racing issue is a non-starter and each lb. of mass (weight) lost on a flywheel can equal up to 15 lbs of static weight (think chassis, seats, beer belly).
+ Effective increase in power (less inertia)
+ Less transmission wear with ability to "slew" the engine faster (Engine speed can increase and decrease at higher rate; this allows for better gear matching.).
+ Effective power gain greater in lower gears (the lower the gear, the greater the "effective gain."
- As mentioned, depending on weight loss of new flywheel, additional vibration and the vibration will generally show up at lower RPM.
- No increase in static power output (won't help much at high speeds where aerodynamic forces are large [ > 100 MPH] )
- Hard to predict advantage/increase in 'effective hp gain' when replacing dual mass flywheel (as is used 03 CLS manual and other cars).
- The drag race issue is not “settled” one way or the other. IOW, just making a flywheel lighter will not necessarily make a car harder to get off the line. It depends... A flywheel can be used as an “energy reserve” – at the starting line while revving -- to store a lot of energy to be dumped into the tires (especially helpful if the car bogs and is RWD). I don’t know how relevant this would be with a FWD street vehicle.
If the car is used for road racing/rally, the drag racing issue is a non-starter and each lb. of mass (weight) lost on a flywheel can equal up to 15 lbs of static weight (think chassis, seats, beer belly).
05-06-2003, 01:33 PM
#11
Cost Drivers!!!!
Originally posted by allmotor_2000
I'll let ya'll know how it feels... just waiting on Comptech to ship it!
I'll let ya'll know how it feels... just waiting on Comptech to ship it!
Please do!!!! I'm pretty interested in doing the mod.
05-06-2003, 02:15 PM
#12
The Acura Granddaddy
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So would it be correct to assume that the factory flywheel is "heavy" to improve the driving characteristics? i.e. Because it stores energy you dont have to be as percise in rev matching?
05-06-2003, 04:55 PM
#13
Safety Car
I do think, however, that using the lightened flywheel AND the lightened pulleys are going to cause harm to the motor... all the little harmonic vibrations arn't going to be dampened... especially with the aluminum pulley... so bearing life and hence crank life will decrease!!
05-06-2003, 05:42 PM
#14
Coming to a city near you
I use to have a Jun ultra light on my ITR civic hybrid. It use to rev really easy. And I was able to get into Vtec quicker. But I was only 1.8L and made all my power in the high rpm since I didn't have any torque. I'm not sure if a V6 3.2L really needs it.
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