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

[kmartind]

Originally Posted by Imortalfu

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..

[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]

Originally Posted by kmartind

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?

[river]

if you like gaining anywhere from 40-60 HP from lighening up your drivetrain then yes, they are worth it (lightened flywheels). I would not have a car without it. standalones are complicated and hard to even get to baseline...go with dsmlink.

[Generation1JeY]

the reason why the boost drops from a lightened flywheel is not cause of the big turbo or anything like that. It doesnt matter what turbo u have the rpms are going to drop a lot faster when u let ## foot off the gas with a lightened flywheel.

This happens because its so light it doesnt have as much momentum or inertia to keep spinning. With a really heavy flywheel it will rev a lot slower, but when u let ## foot off the gas on a flat road the rpms will drop a lot slower just because its so heavy that it keeps itself and the crank spinning.

It doesn't make the biggest difference in the world, but u will waste a little more gas, and when driving up a steep hill the second u take ## foot off the gas the rpms will rocket downward.

Previously said though if ## willing to accept those downsides u can pick up faster revving and a few extra horsepower from a lighter flywheel.

[GSXRolla]

I was having a hard time stating exactly that If you're able to keep the turbo w/in the effective boost range, then there's no probs. If the RPM's drop too fast, it might be hard doing that.

[amp9211]

Before i got mine, I was told that the lighter the flywheel, the less streetable the car. I don't know how much of that I believe, though. I think that some people will use stockers when drag racing to keep the transmition speed up. A lightener one would give more throttle response if you were doing say SCCA racing. I went with the ACT Streetlite and am very happy with it. But unless you are doing clutch or tranny work on your car in the near future, I would just hold off on it until then.

[firefighter_637]

so i wanna get a new flywheel and i was wondering whether or not the fidanza flywheel is a really good one or not, i like the sound of it being 8 pounds and sending 25 horsies straight to the wheels let me knoe what ya think!!!

[Staytuned]

Loved mine the minute I took it out.