Effects of lightweight flywheel? [merged] light weight lightened aluminum ACT fidanza

[Fryguy]

All light weight flywheel newbie threads are merged here.

I'm looking for my car to be very fast at lower speeds; my main goal is very fast acceleration. Will a lightweight flywheel be beneficial to this? Or should I just save up all my money and drop a turbo on my 84k engine

 

[Sephroth57]

also i did search around before posting this and found some varied responses, some people say it makes it better low end acceleration, some said they feel its not even good to have lightened one? my friend knows a decent amount about cars and he was against me getting one he said it would hurt my top end? i dont see how it would matter though

 

[GinNBoost]

Supposedly the car will rev alot faster, which I guess will equal getting to your powerband faster and going through gears more quickly.

I'm no expert on the subject but if your car revs up faster, than it will also rev down faster.

 

[JiveMasterT]

lightened flywheels are nice, especially for autocross where you do a lot of double clutching and so forth. i dont have one in my car, but i want one so that my car revvs faster and i get to my power band quicker.

 

[Groomz]

Reduced load on bearing.

SFI approved for drag racing in several circuits ( NHRA, IHRA, etc ).

Dissipates heat faster/more efficiently.

Handles more abuse/more passes before failure.

Less power loss due to lower rotating weight. Losing 10lbs of flywheel weight is more than that to the engine, being that it has to spin that stock 20lbs flywheel pretty fast.

Stay away from stock lightened flywheels, they belong with fat-free mayonaise.

 

[98RedGs]

Originally posted by Groomz
Reduced load on bearing.
SFI approved for drag racing in several circuits ( NHRA, IHRA, etc ).
Dissipates heat faster/more efficiently.
Handles more abuse/more passes before failure.
Less power loss due to lower rotating weight. Losing 10lbs of flywheel weight is more than that to the engine, being that it has to spin that stock 20lbs flywheel pretty fast.

Stay away from stock lightened flywheels, they belong with fat-free mayonaise.

:laugh: @ mayo.

Originally posted by GinNBoost
Supposedly the car will rev alot faster, which I guess will equal getting to your powerband faster and going through gears more quickly.

Correct.
This is exactly what I noticed when I put in my 2600 and flywheel and drove it for a couple weeks then let a friend of mine on the stock setup try my car. He wondered why my car revved so fast.

 

[Sephroth57]

would you say it was a noticable speed increase?

 

[98RedGs]

Originally posted by Sephroth57
would you say it was a noticable speed increase?

It's not a "speed increase" it's better throttle response so you can say it's "speed increase" but theres not. It simply spins quicker so your thottle response is tighter giving you the impression you get an increase in speed.


*I think I just confused myself*

 

[Sephroth57]

im confused too

 

[Imortalfu]

Are they good for a 98 GSX? I need to get a new clutch and probably master and slave cylinder since the pedal sticks to the floor and feels mushy, so I bought a Centerforce DF (the one on the main page) and decided I might as well get a lightweight flywheel. The reason why I am asking is because I was hanging out with some other DSM's around my area that I met up with and one of them mentioned crankwalk being a issue with lightweight flywheels. I'm 95% sure he don't know what he is talking about, but there is that 5% left.

Also, anyone know where I can buy a new master and slave cylinder for my clutch? Thanks

 

[greeneclipse]

from what i hear, it's a real good piece.....i know a few dsmr's using them and they have had no problems.

 

[kmartind]

I need to get a new clutch and probably master and slave cylinder since the pedal sticks to the floor and feels mushy
...
some other DSM's around my area that I met up with and one of them mentioned crankwalk being a issue with lightweight flywheels.

Speaking of crankwalk, it's another possible cause of the symptom you described above so you may want to check out this thread
http://dsmtuners.com/forums/showthread.php?t=126385
(or any one of numerous other similar threads) before you get too far into it. Not saying you have it, just don't overlook it as possiblity unless you've already checked your end play or verified the clutch system is actually the problem. If you later decide to go 6-bolt, a 7-bolt flywheel won't do you much good.
In either case a light flywheel shouldn't "cause" crankwalk under any circumstances as long as it's installed correctly and stepped properly for the clutch.

 

[paul s]

I have been using that flywheel for the past 3 years and it works awsome..

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[midnght]

It is not the flywheel that is rumored to help pronounce CW. It is a heavier Pressure plate (ACT 2600). The fact is if you are goingto get crankwalk, you are going to get it. These products just might make it rear its ugly head sooner.

As for the flywheel....

I have seen people loose time at the track from the wheel being so much more lighter than the stock piece. Most have choosen to go with the ACT streetlite instead. It is lighter, just not to the point of the Fidanza. Either way, is really your decision.

 

[Imortalfu]

Speaking of crankwalk, it's another possible cause of the symptom you described above so you may want to check out this thread
http://dsmtuners.com/forums/showthread.php?t=126385
(or any one of numerous other similar threads) before you get too far into it. Not saying you have it, just don't overlook it as possiblity unless you've already checked your end play or verified the clutch system is actually the problem. If you later decide to go 6-bolt, a 7-bolt flywheel won't do you much good.
In either case a light flywheel shouldn't "cause" crankwalk under any circumstances as long as it's installed correctly and stepped properly for the clutch.

Yeah I am pretty confident it is the clutch system. I haven't checked bearing play yet, but the clutch doesnt stick to the floor, i just have like 8 inchs of free play before the clutch engages and when it engages it is only about 3 inchs from the floor. By sticking to the floor I mean that it "hovers" just above when it engages, which is about 4 inches off the floor. It doesn't stick down on hard left turns, and the RPMS dont do anything when you push it in to engage it. Plus I never checked the fluid in the master cylinder until last week and that sucker was bone dry. I bled the clutch after that, but I think the cylinder may have been damage from there being so little fluid in the system.

 

[90TalonTsiFl]

I have a 90 tsi fwd. I have the act 2600 clutch in it. My throw out bearing is going out and I have to change it so I want to put in a new flywheel at the same time. But I don't know which one to get the act streetlight which is 12.5lb. or the fidandza thats 8lb. I don't know if it matters how light it is or not. Help me out guyz thanks alot.

 

[guitarXgeek]

Generally, you don't want to go too light with the flywheel on a predominantly street-driven car. The ACT xact streelite is actually 11.6 lbs, and is plenty light enough for most street/strip applications. I personally think 8lbs is too light unless the car spends 90% of its time on the track.

 

[erc's_gsx]

i dont know if u are AWD or not, but the stock flywheel should be fine. as for FWD, many tend to go with the act streetlight flywheel.

 

[midnght]

I give the ACT 2 's up!!

Very streetable with the 2600.




As for the Fidanza, I have no experience with it to compare. I do know of people that have flopped back and forth. Both ACT-->Fidanza and Fidanza--->ACT.

 

[Spdrcr7882]

I have a fully built engine with hks cams and frh intake mani. I plan on puttin down big numbers, and was wondering if is worth it to get a lightened flywheel, or to save for other mods, such as a stand alone.
Is there n e facts or hp gains to back up a lightened flywheel.
Justin

 

[95Eclipsers]

id save up for the stand alone!

 

[Spdrcr7882]

that's the direction i am leaning, but everytime i pick the stock 6 bolt flywheel up, and compare it to my 7 bolt jun lightened flywheel, i can't help but think it would make a big diff. to have a lightened flywheel.
Justin

 

[igopoopy]

less mass to spin=better
you can feel the diff

 

[GSXRolla]

You'll notice that the thing free-revs a lot quicker. I've got a 7lb Fidanza, and the damn car revs like an Indy Car. Very sweet. However, I've heard from others with 20g Turbos and larger (I'm only running a 16g), that the stock flywheel actually HELPS their performance because the revs don't drop quite as fast and they're able to keep it in the effective boost range without the engine falling into too low rpms. Does this make sense to you? Just a thought.

As far as I'm concerned, I like mine, and wouldn't go back, but if I was running something bigger than a 16g or 20g, it might be something I'd reconsider if I could pull a bit of extra performance out of it.

 

[rborgia]

I have a Lightened Flywheel on my 3G... Yes you do feel a difference in how fast you spin up, however on the 3G when I come to a stop, the engine will drop so low it will sometimes stall. From what I understand this is because the "Lightened" flywheel doesn't have the mass needed to keep the engine going.

I believe its a trade off... Faster through the RPMs vs the mass needed to keep the engine going. All you need to do to offset it is to tap the gas a little.

Rich

 

[Lunch_Box]

Since he plans on making big numbers will the stock fly wheel be able to haddle it?