I just got an m5 flywheel for my m30, and was wondering what studs I'm going to need to bolt this thing up, and where to get them. Anyone have any experience using this flywheel? I'm thinking it's going to be a huge difference, 32lbs to 11lbs

I don't remember exactly, but they're metric and pretty big. Factory bolts are grade 12.9, but its impossible to find them, so you'll have to use grade 10.8, which is fine because that's what my 9lb JB racing flywheel came with. You should be able to find them at any decent hardware store.

You can get them from the dealer, it's usually not that expensive to get the 'right' bolts from the dealer for these special applications.

my 9lb JB racing flywheel

redfive - hows the car idle and shift and such with that light of a flywheel? do you think I'll have any problems?

I just got an m5 flywheel for my m30, and was wondering what studs I'm going to need to bolt this thing up, and where to get them. Anyone have any experience using this flywheel? I'm thinking it's going to be a huge difference, 32lbs to 11lbs

Just use the stock M5 bolts from the dealership (less that $2 each). I am running a stock E12 M30 flywheel which is 16lbs and I just used stock E12 bolts so they would be the correct length. The only difference between the M5/E34/E28/E12 bolts is the length.

I just got an m5 flywheel for my m30, and was wondering what studs I'm going to need to bolt this thing up, and where to get them. Anyone have any experience using this flywheel? I'm thinking it's going to be a huge difference, 32lbs to 11lbs

The e28 M5 flywheel is actually 15lbs and the pressure plate assembly for the e28 is heavier than the e34 bu not significantly. Maybe you can measure both and post the total weight loss.

ahh - it's an e28 m5 fly, ok. well thanks, I'll weigh it all up when it arrives and I get mine out.

the pressure plate assembly for the e28 is heavier than the e34 bu not significantly.


That may have been true in 1993, but it's no longer the case. All S38/M88 (non B38) cars use the same pressure plate/clutch assembly.

So what does a better flywheel do?

Could this modification possibly lead to problems along this line? (Just asking cause I'm not in the know!)
http://www.toyotacelicaonline.com/pulleys.htm

Could this modification possibly lead to problems along this line? (Just asking cause I'm not in the know!)
http://www.toyotacelicaonline.com/pulleys.htm

it could...

So what does a better flywheel do?

It frees up power in the engine. Think of it like this, everything that has weight takes power, the less weight, the more power you will see. It's like whether or not you want to run up a hill with 3lb shoes or 3oz shoes, the less weight in a flywheel the less power it will take to spin it. Less weight will make the engine accelerate faster through the rpm range.

The downside is usually the car will be easier to stall if you don't keep the rpm up, as the inverse is true, that the less weight it something has the easier it is to stop it. Not that you won't be able to drive the car, it's just something to keep under advisement.

Is that true for automatics as well?

Automatics don't really use a flywheel, they use a flexplate to bolt the crankshaft flange to the torque converter. The same principal applies in that the less mass to accelerate the more power you'll have, but automatics work very differently and use different types of parts than a manual transmission.

you'll notice a major difference for a couple of months and then you'll be numb to it. been running a 533 flywheel and clutch on both my 535 e34 and the M88/3. with the milage I've put on them, if it were bad harmonics wise, I Should have broken something by now. I don't think I'm hitting any critical speeds (resonant harmonics) through the revs. And if I did blow up the engine and had parts scattering everywhere,it's not like I'd start buying KIA's and curse german engineering for my modification errors.

it's not like I'd start buying KIA's and curse german engineering for my modification errors lol, well thanks for the info. I'm fairly excited about putting it in. Too bad I wont be able to drive the car to test it untill spring

hey DurWood, just wanted to resurrect this old thread to see how this all went. Did you get it installed ok? Nothing blow up?

Yeah, I'm curious too. I'm likin' this whole flywheel business. Although I almost stalled Hari's car from not being used to it, so watch out!

Yeah, I'm curious too. I'm likin' this whole flywheel business. Although I almost stalled Hari's car from not being used to it, so watch out!


You got to drive Hari's car? I'm jealous...

Yeah Hari is THE man. His car revs like an M, real sensitive throttle. He's lettin' me do some custom interior work to it tomorrow. :D

Yeah Hari is THE man. His car revs like an M, real sensitive throttle. He's lettin' me do some custom interior work to it tomorrow. :D

very cool, can't wait to see the results

I did this mod about six years ago, when my dual mass flywheel was ruined by a front trans deal leak. Its basically stock e28 running gear, nothing damaging or risky about it. I don't care for the spongy feeling of the heavy dual mass wheels, nor how lazy the motor feels when you rev it. I would consider this a 100% no risk mod.

I'm running my old E12 flywheel which is single-mass and about 16 lbs in my M30b35 5spd Touring. I used the E28 535i clutch.

My E12 M535i has the JB Racing, 8.5 lb aluminum flywheel which revs ridiculously fast with no adverse affects for idle or driveability in my opinion. The M30 doesn't seem to care how light the flywheel is that it's hooked to. :D

Does anyone know where I can find a single-mass (e28) flywheel? Dealer? Or any other less expensive alternatives?

Thanks,
Brian

Try some of the BMW dalvage yards. Bavarian Auto recycling. If you have a local salvage yard that you can go to - you can look at it yourself and make sure its ok.

Does anyone know where I can find a single-mass (e28) flywheel? Dealer? Or any other less expensive alternatives?

Thanks,
Brian

I have an E12 single mass FW, if you're looking.

I have an E12 single mass FW, if you're looking.

pm'd you. Thanks, brian

Could this modification possibly lead to problems along this line? (Just asking cause I'm not in the know!)
http://www.toyotacelicaonline.com/pulleys.htm

Interesting, I just read the whole article. I'm sure most of it was exaggerated to get the general point across, so I doubt that a lightweight flywheel will actually rain on the M30s parade anytime soon. I haven't heard of any negative testimonials from anyone yet so.......thumbs up to this mod! :thumbup: