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Scott Wilkes
DieHard
Tasmania
92 TT Factory Manual

Posts: 871
Reg: 10-2008

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Sunday, August 23, 2009 - 06:22 pm, by:  Scott Wilkes (Scottywilkes) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

ive tried searching but couldnt find anything.

Just wondering if anyone has weighed the factory flywheel of the soarer? Im trying to figure out if its worth buying a lightened flywheel or not.

Anyone with a lightened flyweel, did it make a large difference?
Patrick Maass
Newbie
Europe
MarkII JZX90 TT

Posts: 3
Reg: 08-2009

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Wednesday, September 02, 2009 - 12:54 am, by:  Patrick Maass (Kenji) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I can let you know on Saturday.

My clutch has worn out, and I'n replacing it with a HKS GD-Pro triple plate clutch with 7.4 kg flywheel.
So I know what it's like in a few days time.

The stock flywheel weighs in at around 9 kg.
Scott Wilkes
DieHard
Tasmania
92 TT Factory Manual

Posts: 892
Reg: 10-2008

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Friday, September 04, 2009 - 09:28 am, by:  Scott Wilkes (Scottywilkes) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

awesome thanks mate, im weighing up the idea of getting a lightweight flywheel, was hoping to drop about 3Kg so with the 6kg flywheel i have my eyes on it should make a noticible difference.

Can you tell me how much more free it revs when you have done it as well? As thats my main reason, as the standard flywheel/clutch setup is EXTREMELY heavy haha, dosnt rev snappily when free reving
Dave Cazes
DieHard
SA
tt

Posts: 612
Reg: 08-2007

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Friday, September 04, 2009 - 10:56 am, by:  Dave Cazes (Cazman) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I have been advised agaisnt using the lightweight clutch setup I bought. I havent put it in yet.

The ORC kit is

Flywheel 5.85kg
Pressure plate 2.55kg
Floating disc 1.85kg
Clutch plate 1.35kg

You basically cant get a lighter setup than this, I searched and it was the lightest made for a 1jz.

I was told Id drop boost inbetween gears etc with this setup.

I need a push pull convertor to test it though...
Scott Wilkes
DieHard
Tasmania
92 TT Factory Manual

Posts: 894
Reg: 10-2008

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Friday, September 04, 2009 - 05:11 pm, by:  Scott Wilkes (Scottywilkes) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

thanks guys.

Im looking at an extreme lightened flywheel, weighs 6kg.

Ive got an exedy HD clutch in there, its a daily driver so its the perfect clutch, just want to make it a bit more snappy :-)
Patrick Maass
Newbie
Europe
MarkII JZX90 TT

Posts: 4
Reg: 08-2009

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Friday, September 04, 2009 - 08:41 pm, by:  Patrick Maass (Kenji) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

My clutch and flywheel are going in tomorrow, so I can let you know after the weekend :-)
Scott Wilkes
DieHard
Tasmania
92 TT Factory Manual

Posts: 930
Reg: 10-2008

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Saturday, September 12, 2009 - 03:10 pm, by:  Scott Wilkes (Scottywilkes) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

any news on the weight mate?
Costa Tsimiklis
TryHard
Victoria
TT 300rwkw

Posts: 242
Reg: 07-2008

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Friday, October 16, 2009 - 01:43 am, by:  Costa Tsimiklis (Driftshop) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Its not worth buying a lightened flywheel for a single plate clutch setup. You will loose structural rigidity. The best flywheel is a stock flywheel with a Jim Berry Race Clutch setup to hold 450rwkw no problem.

Commercially available lightened flywheels for stock clutches are gimmicks and dangerous. Stay away from the ones with an alloy main plate and steel inserts - these are particularly weak and prone to shudder and failure when used with a 3000lbs + pressure plate. The Cro-Mo ones out there are not much better either, especially the ones with holes cut out of it. These are far weaker than the factory item and they have large amounts of stress concentrations from the hole cutouts.

The Stock Flywheel, machined to specification with good used or new bolts is more than enough to handle any type of power as long as you use a Jim Berry Full Monty Clutch. The mass aides in dampening the combustion cycle, as well as provides a heat sink for the clutch.

Save your cash and spend it on something that will give you a better improvement to performance. I don't understand the logic behind having a engine that revs more in a stationary car? Who cares about free revs when your parked? Unless you go for a dedicated multi plate clutch setup that has been engineered lighter, the risk of blowing your bell housing to bits with a flywheel, compounded with a sweet f.uck all difference in rotational inertia as you still have the stock/modified pressure plate makes this mod pointless.
Scott Wilkes
DieHard
Tasmania
92 TT Factory Manual

Posts: 980
Reg: 10-2008

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Friday, October 16, 2009 - 05:05 pm, by:  Scott Wilkes (Scottywilkes) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

thanks for your advice mate, it is much appreciated. Ive been looking around and the majority are alloy main with the hardened steel inserts, wasnt particularly fond of that idea.

But il put my money to better use elsewhere, might start buying for the single conversion, get my 3/4 the way to a good external gate :-)
Phil Gibson
Goo Roo
WA
'91 UZZ31 track bunky, '94 blk/blk UZZ31

Posts: 1554
Reg: 07-2005

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Thursday, October 22, 2009 - 02:49 pm, by:  Phil Gibson (Sciflyer) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


Costa Tsimiklis wrote on Friday, October 16, 2009 - 01:43 am:

I don't understand the logic behind having a engine that revs more in a stationary car? Who cares about free revs when your parked? Unless you go for a dedicated multi plate clutch setup that has been engineered lighter, the risk of blowing your bell housing to bits with a •••••• flywheel, compounded with a sweet f.uck all difference in rotational inertia as you still have the stock/modified pressure plate makes this mod pointless.




Do you not understand the effect rotational inertia has? It doesnt matter whether the rest of the clutch is the same, every extra kg on a rotating mass saps both power and response. If it wasnt a worthwhile exercise no one would do it...
Costa Tsimiklis
TryHard
Victoria
TT 300rwkw

Posts: 310
Reg: 07-2008

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Friday, December 18, 2009 - 12:38 am, by:  Costa Tsimiklis (Driftshop) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Phil, I know full well what rotational inertia is. In a street car that wants to be race car on the weekend, factory rotational inertia is good enough on a soarer so that it holds the torque on hills and has enough heat dissipation to deal with a quick squirt or that street / track drag / drift meet. It would also be the last thing I would change on a dedicated race car unless the standard flywheel was failing. The Nissan and Toyota flywheels are so good, they will handle 10,500 RPM without flying apart and without harmonic issues. The material and engineering behind them IS that good.

Paying $600-1000 for a sh!t flywheel will do fu.ck all to real world benefits of reducing rotational inertia given the CLUTCH REST OF THE SYSTEM is heavy anyway. The only slight benefit that you will see is less RPM loss when you change gears - if you change gears slow enough... If you are racing, you would power shift (don't let go of accelerator) or blip the throttle to rev match on down shifts like most racers do.

If you had a Quad Plate Tilton clutch system then you are talking a real reduction in rotational inertia as the clutches are 4" in diameter instead of 10" and the flywheel and basket are made out of light weight materials.

My point is the overall rotational inertia from a flywheel change would be noticeable, but a waste of time, money and dangerous if you use the wrong flywheel. The only one I would consider running would be a Cro-Mo JUN item, that has no holes cut out. It is 5.5kg vs 8.6kg of the stock item and should handle a 4000lbs pressure plate due to its design.



Note that the weight saving here

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