Talk to me about flywheels

[ar3nbe]

Less rotating mass = engine is able to rev quicker

Ok, in terms of real life, quicker down the quarter ?

[myliberty]

Ok, in terms of real life, quicker down the quarter ?

depends on the car setup. sometimes a heavier flywheel can have a positive effect on your launch.

ref: rigoli awd manual drag car, they changed from a light to a heavy wheel to get the tyres turning off the line (if my memory serves me correctly)

[bahaimus]

Ok, in terms of real life, quicker down the quarter ?

Generally, quicker acceleration is the expected outcome, ability to get moving from a standing start notwithstanding

[Mr Ed]

Based upon very rudimentary information, Direct Clutch gave me a $1500 ballpark figure for flywheel and clutch. I take my engine and box to them and they make them work together.

It depends of course upon the clutch that you choose to use and how much torques you're going to make.

Cheers, what sort of clutch was included in that?

Im aiming to get a custom flywheel made so I can use off the shelf GM/Ford clutches in my 2JZ/T56 combo, hopefully overall this will keep my costs down (as falcodore clutches are a shitload cheaper than Supra clutches)

[Mr Ed]

Ok, in terms of real life, quicker down the quarter ?

As others have said, Id expect it to be more useful in a track car than a drag car.

It lets you put power down quicker at the expense of low speed drivability. I guess its similar in drivability to having an unsprung cunt of a clutch.

I was once told that a lighter clutch gives you more power but less torque, I have no idea if this is true or not (I tend not to believe the 'expert' that I heard it from due to alot of other bullshit I was told by him)

[bahaimus]

Cheers, what sort of clutch was included in that?

Im aiming to get a custom flywheel made so I can use off the shelf GM/Ford clutches in my 2JZ/T56 combo, hopefully overall this will keep my costs down (as falcodore clutches are a shitload cheaper than Supra clutches)

Non specific at that stage.

[Shifty]

in my experience direct clutch are very expensive, but they certainly do good work

still, jim berry ain't real cheap either lol

[morerevsm3]

I went from 39Lb dual mass flywheel to 8.5Lb alloy one in my 3 litre M3, still fine for towing car trailer etc, gearbox rattles at idle if you don't have your foot on the clutch now though, doesn't bother me, but it would some people

[Rz]

ive found direct clutch pretty good , and hella cheap.
like the first build on my clutch was like $750 to convert to brass button and subsequent rebuilds due to general wear/tear have been $250.
cant beat that and its handling a good 850hp.

[RB30-POWER]

light flywheel seemed relatively shit in my brothers sr20 pulsar (my opinion from observation only)

light flywheel + huge cams with not much torque down low = almost stalling unless you rev the fuck out of it, modifed n/a + high revs required for take off = loud as fark even with muffler after muffler in pipework until no more would fit.

i guess a track only car this would all be a non issue.

what i'm saying is i would take drivability over a bees dick performance increase at the track.

[stb]

Lightweight flywheel is one of my favourite mods. Extra power at the wheels (because there's more torque) without even trying. Also lets the engine drop revs quicker during manual gearchanges. I believe most complaints about the 1.8l mx5 being not as engaging as the 1.6l is because it has a heavier flywheel and doesn't feel as responsive.

[Billzilla]

light flywheel seemed relatively shit in my brothers sr20 pulsar (my opinion from observation only)

light flywheel + huge cams with not much torque down low = almost stalling unless you rev the fuck out of it, modifed n/a + high revs required for take off = loud as fark even with muffler after muffler in pipework until no more would fit.

i guess a track only car this would all be a non issue.

what i'm saying is i would take drivability over a bees dick performance increase at the track.

The problem with you bro's engine was more likely due to the inlet manifold - I'm guessing it was a plenum type?
And on the track it makes quite a lot of difference.

Extra power at the wheels (because there's more torque) without even trying.

The extra torque is zero. Same as kw ... zero.
The only difference is rotational inertia.

[takai]

I paid <$450 for my lightened flywheel, but it is an off the shelf jobbie.

Ed, like i told you before you can get the Supra clutches resplined for the Falcadore box for about $20more, i think they are actually a Nissan clutch.

[Mr Ed]

Ed, like i told you before you can get the Supra clutches resplined for the Falcadore box for about $20more, i think they are actually a Nissan clutch.

Yeah Ive been looking into the options though and Im worried about using a supra clutch as then I have to fuck about with clutch forks running through the A340e bellhousing (or at least I believe so??), which sounds like it would be alot of effort and require skills that I lack.

Im probably just gonna use a Tilton concentric slave (~$200), stock A70 master cyl, custom line, some form of off the shelf GM/Ford clutch & pressure plate and whatever flywheel I have to in order to make it work.

Or can I just use a 2JZ-GE clutch/flywheel/pressure plate with the concentric slave cyl?

[tim510]

out of interest..

how much will you save doing all that over the cost of a "6 speed kit"?

are the 6 speed box's still stupidly expensive along with all their parts?