UUC m5 flywheel on turbo e30??

[ogbimmer]

okay so I was finishing my m3 last month and I ran into some problems with the flywheel and starter. the m20 flywheel I had would not turn with the m20 starter and the zf320 trans. anyway the combination I finally got to work was a uuc m5 flywheel with a e34 m5 starter but the the UUC flywheel is something like 8.5 pounds wtf...

What can I do to improve my spool?
Will this flywheel make it where I get boost way later?
Can I increase load, make spool better in other ways like heavier wheels, longer diff etc.

My setup is 3.0 m50
zf320 trans
uuc aluminum flywheel m5 pp 4 puck sprung clutch
borg warner 70 trim turbo.

[ogbimmer]

Light weight flywheel and boost vs heavy flywheel and turbo!!! k go

[FLG]

Light weight flywheel and boost vs heavy flywheel and turbo!!! k go

Been reading up on this for the past week and can't find info from a good source or someone who had both. Generally I see turbo guys going ltw with no issues though.

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[PeteD]

I think sharky uses one on his turbo set up he would be a good guy to ping.

Some questions: How much power are you looking to put down? What is the application and what is your main concern?

*I don't know much about turboing the m50, but my last car was a turboed 4g63 Eclipse - and because it was a smaller 4 I kept the flywheel stock for the rotational mass.

[ogbimmer]

I mean I build the motor for like 600hp ( cam forged rods, forged pistons, s52 crank)but these days I will prob just keep it at 10psi and get whatever I get. I really want the car to be reliable these days..

[sayed ali]

I mean I build the motor for like 600hp ( cam forged rods, forged pistons, s52 crank)but these days I will prob just keep it at 10psi and get whatever I get. I really want the car to be reliable these days..

Your car now should be reliable! Focus on tuning in even @ 10psi, you'll get a reliable power

What's your turbo specs?

[ogbimmer]

Borg warner 70 trim turbo. Nothing special i may spoil myself with a garret gt35r at some point next year lol

[Wanganstyle]

Been reading up on this for the past week and can't find info from a good source or someone who had both. Generally I see turbo guys going ltw with no issues though.

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wave

Turbo guy here. Have ran both Light fly and heavy on same engine.

for road racing the light weight unit is nicer as its easier to spike rpm's with a blip of throttle for downshifting.

for drag racing heavy flywheel is better because it makes the "spool" feeling happen sooner; something to do with more load from heavier mass attached.

For Drifting It could roll either way




Street use = heavier is better for turbo.

OEM comparison for STi engines I have driven in same car:

turbocharged:

6mt sti 2500cc engine flywheel is about 28lbs
5mt wrx 2000cc engine is 22-28 lbs
aftermarket exedy chromoly 13lbs

NA cars:

5mt from 2500cc engine 20lbs
5mt from 2200cc engine 15lbs




NA - lighter flywheel = more response from engine
Turbo engine - heavier flyhwheel = more response from Turbo