Lightened Flywheel Thread

[1200det]

Ive been toying with the Idea of a lightened flywheel for my 7MGTE something around 5 - 6 Kgs rather the standard 8.1 Kgs.

I understand the concept and the positives of having a lightened flywheel , Just Interested to hear from any whom have went down this path with noticable results.



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[Billzilla]

All good, though a really light one takes some getting used to.
I went from the 7kg one on the 4AGE to a 3kg one and I spent far too much time on the first day stalling it! I got much better after that though.
One of the biggest and most surprising differences it made was in the upper gears though, where you'd expect it to make the least difference. I could really feel the car push harder in 4th at 5th.
Some people say they make the car lose speed faster going uphill and in theory that's quite right but I never noticed anything much at all there.

[BlackSupra]

Had a 1kg lighter flywheel on the 2jzge and it was all positive!

Pretty sure i have a lighter one on the 7m now, but considering i cant compare it to a stock one, i have no say on the 7m.

But my previous experience is that it sharpens response and gives better part throttle acceleration out of corners.

Worth it!

[Rex_Kelway]

Sweet This thread could not be more timely...

Bill,

Having never had the chance to compare two the flywheels back to back. Its hard for Rex to predict the gains from the upgrade.

The car is a trackday/tarmac events regular SC'd AW11 with LSD, light suspension, and semi-slicks when it hits the track. The mods are focused simply to make it swifter around the track without resorting to power upgrades or major racecar style upgrades (its still a roadie)

Rex was looking to upgrade to a 3.6Kg Aluminium flywheel which is less than half the stock ones weight.

He minds not having to adjust his daily driving style as long as the improvement is worthwhile when it meets the track.

Would you recommend such an upgrade as worthwhile in Rex's case?

Cheers

Rex

[kingmick]

on a 4ag a light flywheel will be noticable on atmo and turbo, on the SC it will not be as noticable. why becaue of the extra torque down low!

light flywheel helps spin up same as light rotating assembley,titanium valves and the lightest springs{seat pressure} you can run to do the job will.
everything with more weight to spin or move as well as things with more friction, drain engine power.
p.s the above is the same for all engines, 7m included.

[roadsailing]

there is only really one advantage to a heavy flywheel.....

launching when you are drag racing and using a slider clutch.

i reckon it is worth having one just for the peppy free revving, i plan on getting one for my 4AGE some day, might even get all creative and get a multiplate clutch bolted to an automatic flex plate.

[kingmick]

there is only really one advantage to a heavy flywheel.....

launching when you are drag racing and using a slider clutch.

i reckon it is worth having one just for the peppy free revving, i plan on getting one for my 4AGE some day, might even get all creative and get a multiplate clutch bolted to an automatic flex plate.

forget the flex plate!lol

[Rex_Kelway]

Rex would've thought that the SC's torque would've accentuated the effect with the additional force whipping it round with a greater rate of acceleration?

[damz]

Ive got a pretty light aluminium flywheel behind a 5MGE and although I cant compare it to a stock FW, compared to how it revved with the auto behind it, it makes a very big positive difference...
I wouldnt want a very light flywheel behind a small capacity or low-torque engine tho..

[kingmick]

it would if you where chasing micro seconds!

and shiny the other advatage of a heavy flywheel is that its easyer to drive.

[Hurricane]

yeah ive got a lightened flywheel on the ke20 with a 4k and it is all good revs alot better and quicker

[psychofox]

I too am in the contemplation process of installing a Lightened flywheel, for a 4AG 20V in my 86. I've looked around at the various Japansese manufacturers for ones to suit the 212mm clutch (ie ae92/101/111 size) and the weights they specify for their flywheels:
JUN 4.6Kg
Toda 4.4Kg
HKS 5.4Kg
all of these would be at great cost to import, etc. so I pretty much discounted them.

I noticed that Xtreme clutch make 2 flywheels to suit a 212mm clutch 4A, a cro-moly that weighs 3.6Kg which is about $420 and an aluminium one which weighs the same 3.6Kg that costs about $650. My first impression was why they were a good deal lighter that the Jap flywheels. Are they going to be too light for street/moderate track/hillclimb use? Also Are aluminium flywheels superior to Cro-moly ones? I thought it was the other way around, but looking at the price differential....

Another crucial question, is putting a lightened flywheel on the motor going to be one of those wow!! I can't believe I didn't buy this earlier!! type of upgrades or is it going to be one of those yeah well wasted $500 right there ones. As Rex says I've never driven a car with a lightened flywheel ( and don't know anyone who has one) so I can't 'try before I buy'.

Thanks

[kingmick]

alloy has to be a good grade and takes more work to make safe than moly, so hence the price diffrents.
depends on the engine and the cars weight to wether you go wow or not.
and is the hilux diff in the sprinter yet?

[Billzilla]

Would you recommend such an upgrade as worthwhile in Rex's case?

Very much so!
It'll be a bit hard to get used to for the first couple of days, but after that I gfound it no problem at all. The only hassle I had was that at the same time I also fitted a close-ratio gearbox, so 1st gear was something like 2.5:1 so it'd do about 80km/h in 1st. So I avoided anywhere I had to o a hill-start.
But with a regular box I don't think it'd be a huge problem.
It's an absolute must for a race engine.

[kingmick]

bill, rex's is GZE