with a new clutch & lighten flywheel. Will it change the way my car idles

 

it shouldn't , just the way the motor response far as rev.s go. it should rev faster and the clutch will help engage better, getting more torqure and power to the wheels. and u might want to look in to getting a l.s.d.

 

no

but if you get light weight flywheel, you will lose some torque, but get better engine response, faster revs..

 

you will lose no torque based on the regular output of your engine, i have heard people say this before and it is completely untrue, having a lightweight flywheel reduces the rotating mass, so when launching your car, you might appear to have less torque due to the reduction in rotating mass which would equal less force while the clutch is not engauged

 

i had lightened flywheel, and yes you do lose torque.

try rolling at 1000 rpm, then stomp on the gas, it bogs, compared to before when it had stock heavy flywheel.

heavy flywheel, helps keep the engine rotating, and helps the torque.

imagine this, put a shaft and something large disc which weights like 1 pound, spin it fast, and then grab it, it will stop without slipping or burning your hand, or anything.. but try this, a 20-30 pound disc of same diamater, and spin it at same speed, and try to stop it... tell me what happened...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VTECR021 &raquo;</TD></TR><TR><TD CLASS="quote">i had lightened flywheel, and yes you do lose torque.

try rolling at 1000 rpm, then stomp on the gas, it bogs, compared to before when it had stock heavy flywheel.

heavy flywheel, helps keep the engine rotating, and helps the torque.

imagine this, put a shaft and something large disc which weights like 1 pound, spin it fast, and then grab it, it will stop without slipping or burning your hand, or anything.. but try this, a 20-30 pound disc of same diamater, and spin it at same speed, and try to stop it... tell me what happened...</TD></TR></TABLE>

ok so hand will get burned trying to clutch it.. so wat does all this means?

 

you should get rid of the lightened fly wheel they suck on h22. i put one on my h22 eg and it was cool for about two weeks then i started to realize that i was losing torque. you should leave the stock one in their and get and LSD tranny

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VTECR021 &raquo;</TD></TR><TR><TD CLASS="quote">i had lightened flywheel, and yes you do lose torque.

try rolling at 1000 rpm, then stomp on the gas, it bogs, compared to before when it had stock heavy flywheel.

heavy flywheel, helps keep the engine rotating, and helps the torque.

imagine this, put a shaft and something large disc which weights like 1 pound, spin it fast, and then grab it, it will stop without slipping or burning your hand, or anything.. but try this, a 20-30 pound disc of same diamater, and spin it at same speed, and try to stop it... tell me what happened...</TD></TR></TABLE>


dude, you obviously know nothing about engine design.

YOU DON'T LOOSE TORQUE!!!!
Try and accelerate that shaft you talk about with the 20-30 lb disc compared to a shaft with a 1 lb disk!!! you almost can't!

Yes, you don't feel a huge kick when you shift because you don't have the stored energy in the rotating flywheel. that's because it's already been transfered to the ground/wheels making you go forward!!!


I hate people giving off wrong info!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Paluce &raquo;</TD></TR><TR><TD CLASS="quote">


dude, you obviously know nothing about engine design.

YOU DON'T LOOSE TORQUE!!!!
Try and accelerate that shaft you talk about with the 20-30 lb disc compared to a shaft with a 1 lb disk!!! you almost can't!

Yes, you don't feel a huge kick when you shift because you don't have the stored energy in the rotating flywheel. that's because it's already been transfered to the ground/wheels making you go forward!!!


I hate people giving off wrong info! </TD></TR></TABLE>

So I guess that settles it? Wondering If I should lighten mine as well.

 

well on another forum there was a big huge discussion on about it, and yes you lose torque.

have you ever seen a V-8 flywheel? its huge and friggin heavy.

and from my experience with my prelude and other peoples feedback, yes you lose torque.

 

A lighter flywheel has less inertia, so btw shifts the revs drop faster but it also accelerates faster.

You don't lose or gain torque w/ a flywheel. You are playing w/ inertia and acceleration.

 

Dude, V8 guys have been using lightened flywheels for soooooo long. Please stop giving misinformation unless you have FACTS to back it up.

 

Im putting in a fidanza 8lb on saturday - Ill let you know how it is in everyday driving since I wont be pushing it hard for at least a week.

 

does anyone have 0-60 times before AND after installin flywheel? my clutch is startin to slip now, and i'm lookin to get an act clutch+flywheel.... but all this talk of losing performance is making me quake in my shoes!

does anyone have FACTS? not just opinions? cos i've been postin my questions on preludepower AND here, and what everyone seems to have are opinions, and no one is EVER 100% sure on what's they're postin! FACTS PLEASE!!!! pretty please with cherry on top!! and cream!

 

Removing mass from the rotating assembly will not hurt performance, period.

Herb Adams, in his book CHASSIS ENGINEERING, says that <TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">"..the effect of reducing rotational inertia on driveline parts has 15 times the benefit of just reducing the weight of the car."</TD></TR></TABLE>

 

The torque that is produced is a function of combustion. Heavy flywheels just help smooth things out. Until I see a dyno of a car that has actually lost torque, I will never believe it. On the other hand, I do believe I have seen the opposite.

 

coool~~ so would there be any reason NOT to get a light flywheel? the pro's and con's of prolite vs. streetlite?

 

Trust me, you do not lose torque. I have a degree in mechanical engineering. But I will advise this, I have an ACT prolite in my delSol S21 tranny and B20Z engine. I would suggest that you get a streetlite for daily driving unless you are going to have a strip car only. The reason is, due to the lack of inertia with a heavier flywheel, the motor will quickly loose revs, enough so that it will sometimes cut off when slowing down (I hold the clutch down sometimes when coming to a stop light). At least with a slightly heavier flywheel, it can help to keep the revs up and the motor from so easily cutting off. Again though, you do not lose torque!

Octavious

 

A heavy (stock) flywheel will help you launch from a stop, as the stored rotational energy in the flywheel will help you get off the line. Once you've moved 30-40 feet, the heavy flywheel hurts you. A lighter one will allow the engine to rev faster, as it doesn't have to rotate as much mass. The Jun flywheel I put on my car was the best mod in my opinion. It makes the fat lude feel 200 lbs lighter.

 

since installing my 8lb fidanza flywheel, my power before vtec has increased (not saying that power after vtec hasn't increased, I don't hit vtec all the time while driving), also I cant hit vtec in the rain without the tires wanting to break loose.

 

I just got my can back today with an exedy organic clutch and fidanza flywheel - so far it feels awesome! I havent taken it past 4000rpm yet, but in the last 60mi Ive driven it is alot smoother, and revs do build up quicker down below...so the loss of torque thing is false. Also, the exedy clutch feels very close to stock, and is a very streetable combo.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ludedudekevin &raquo;</TD></TR><TR><TD CLASS="quote">coool~~ so would there be any reason NOT to get a light flywheel? the pro's and con's of prolite vs. streetlite?</TD></TR></TABLE>

The only issue is when letting the clutch out. With a big flywheel storing lots of rotational energy, it makes engaging the clutch a no-brainer. With a light flywheel the engine changes speep *much* easier, both up and down in rpm. Letting the clutch out will more easily cause the engine to stall, until you "learn" the new shifting technique.

About "losing torque," Okay, where did it go then? I think it's a misunderstanding of what's going on. It's the same torque, just going different places.

Big picture, a light flywheel is a good thing

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kb58 &raquo;</TD></TR><TR><TD CLASS="quote">

The only issue is when letting the clutch out. With a big flywheel storing lots of rotational energy, it makes engaging the clutch a no-brainer. With a light flywheel the engine changes speep *much* easier, both up and down in rpm. Letting the clutch out will more easily cause the engine to stall, until you "learn" the new shifting technique.

About "losing torque," Okay, where did it go then? I think it's a misunderstanding of what's going on. It's the same torque, just going different places.

Big picture, a light flywheel is a good thing </TD></TR></TABLE>

if i could actually find the dyno chart i posted in one of the "lightened flywheel" threads , there was a guy that did a base run then installed a lightened flywheel and new clutch and thru out the rev range you could notice an equal gain, but in reality its not a gain, but less engery is being stored/robbed away by the flywheel. this is what we get into called drivetrain losses. ive seen all over people upgrading all there engine and tranny bearing in all motor applications to "free up" horse power.

so with a lightened flywheel less engery is obsorbed by trying to get the flywheel up to speed, but also it effect drivability like KB said, now there is not much engrgy stored to help get he car moving when engauging the clutch, but its easy to learn

 

Is it best to upgrade the flywheel and clutch together? Whats the best of each to buy? Thinking Jun Flywheel and ACT Clutch (stage 1 Im thinking), any good? Is this a good upgrade on a stock engine (apart from KN air filter and cat back exhaust)?

 

Its good to modify them at the same time cause its cheaper