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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Light Weight Flywheel Options - N52



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      01-11-2021, 02:22 PM   #1
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Light Weight Flywheel Options - N52

Are there any good light weight fly wheel options for the N52? Something that still would be fine to street drive but still noticeable with improved performance?

Edit:
Just installed JB Racing Light Weight Flywheel impressions on post 22

Last edited by Volasko; 05-10-2023 at 11:28 PM..
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      01-11-2021, 03:04 PM   #2
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Thought about a single mass conversion?
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      01-11-2021, 04:54 PM   #3
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Single mass might net you less chatter.... but I'm on the JB Racing Aluminum lightweight flywheel. It's solid... I can see if I can get a bs video recorded for you with how the rpms shoot up in neutral. I have no complaints with the noise. You may feel differently.
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      01-11-2021, 06:01 PM   #4
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Quote:
Originally Posted by Noir View Post
Single mass might net you less chatter.... but I'm on the JB Racing Aluminum lightweight flywheel. It's solid... I can see if I can get a bs video recorded for you with how the rpms shoot up in neutral. I have no complaints with the noise. You may feel differently.
Video please...
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      01-11-2021, 10:46 PM   #5
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Quote:
Originally Posted by Biginboca View Post
Quote:
Originally Posted by Noir View Post
Single mass might net you less chatter.... but I'm on the JB Racing Aluminum lightweight flywheel. It's solid... I can see if I can get a bs video recorded for you with how the rpms shoot up in neutral. I have no complaints with the noise. You may feel differently.
Video please...
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      01-12-2021, 12:48 PM   #6
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Quote:
Originally Posted by neilvan View Post
Thought about a single mass conversion?
Yeah but from what I read the overall weight is similar to the DMFW so from a performance perspective it isn't that much different.
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      01-12-2021, 01:50 PM   #7
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Quote:
Originally Posted by Volasko View Post
Yeah but from what I read the overall weight is similar to the DMFW so from a performance perspective it isn't that much different.
Stock replacements ya(valeo kit) but arn't there any aftermarket ones? TBH I haven't looked
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      01-14-2021, 08:32 AM   #8
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Quote:
Originally Posted by neilvan View Post
Stock replacements ya(valeo kit) but arn't there any aftermarket ones? TBH I haven't looked
I tried too and so far the only thing I found is what Noir mentioned about the JB unit. Looks to be a massive weight difference (> 50% reduction in rotating weight) so I could see it being more suitable for track use. Looking forward for a video example.
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      01-17-2021, 06:47 PM   #9
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3 videos for you, OP.

https://youtube.com/channel/UCe7Jg1e5qVN5t1dK4w__OXQ

Sorry for the rough camera work — poor use of certain words (kept saying vibration when I meant to say chatter, at times). But hopefully this helps you make a decision. That flywheel is really bad ass.
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      01-18-2021, 09:17 AM   #10
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Quote:
Originally Posted by Noir View Post
3 videos for you, OP.

https://youtube.com/channel/UCe7Jg1e5qVN5t1dK4w__OXQ

Sorry for the rough camera work — poor use of certain words (kept saying vibration when I meant to say chatter, at times). But hopefully this helps you make a decision. That flywheel is really bad ass.
Wow, that chatter isn't nearly as bad as I would have thought. It does look like the engine spins up way easier too, even with that SC setup you have. Looks completely livable especially on my car that really only sees uses for HPDE days or some fun summer road trips.

Thanks for making the video, did you say you had your idle RPM upped? Your idle seems very smooth but settled at a higher level than mine.

Last edited by Volasko; 01-18-2021 at 09:24 AM..
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      01-18-2021, 10:57 AM   #11
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Quote:
Originally Posted by Noir View Post
3 videos for you, OP.

https://youtube.com/channel/UCe7Jg1e5qVN5t1dK4w__OXQ

Sorry for the rough camera work — poor use of certain words (kept saying vibration when I meant to say chatter, at times). But hopefully this helps you make a decision. That flywheel is really bad ass.
Awesome thanks for posting that Noir !!

So from what I’ve read the n52 came with 2 different flywheels through the production run. Going by my poor memory one was like 17lbs and the other like 23 or something. I’m sure the info comes up if anyone is interested enough to search.

I did the research for mine and I have the lighter oem flywheel. Comparing mine to your video I can’t really see any difference, but I’m sure the S/C adds some drag and momentum to your set up also. I wonder if you have the lighter oem flywheel if it’s worth upgrading to the aftermarket.

How many lbs is the one you are running in that video?
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      01-18-2021, 11:47 AM   #12
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Quote:
Originally Posted by Volasko View Post
Quote:
Originally Posted by Noir View Post
3 videos for you, OP.

https://youtube.com/channel/UCe7Jg1e5qVN5t1dK4w__OXQ

Sorry for the rough camera work — poor use of certain words (kept saying vibration when I meant to say chatter, at times). But hopefully this helps you make a decision. That flywheel is really bad ass.
Wow, that chatter isn't nearly as bad as I would have thought. It does look like the engine spins up way easier too, even with that SC setup you have. Looks completely livable especially on my car that really only sees uses for HPDE days or some fun summer road trips.

Thanks for making the video, did you say you had your idle RPM upped? Your idle seems very smooth but settled at a higher level than mine.
Yeah, man! It only gets real chatter-y if the AC is on. SOMETIMES it gets annoying being at a light next to other folks because the sound bounces right back at me — but I just push in the clutch and all is right with the world.
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      01-18-2021, 11:49 AM   #13
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Quote:
Originally Posted by Biginboca View Post
Quote:
Originally Posted by Noir View Post
3 videos for you, OP.

https://youtube.com/channel/UCe7Jg1e5qVN5t1dK4w__OXQ

Sorry for the rough camera work — poor use of certain words (kept saying vibration when I meant to say chatter, at times). But hopefully this helps you make a decision. That flywheel is really bad ass.
Awesome thanks for posting that Noir !!

So from what I've read the n52 came with 2 different flywheels through the production run. Going by my poor memory one was like 17lbs and the other like 23 or something. I'm sure the info comes up if anyone is interested enough to search.

I did the research for mine and I have the lighter oem flywheel. Comparing mine to your video I can't really see any difference, but I'm sure the S/C adds some drag and momentum to your set up also. I wonder if you have the lighter oem flywheel if it's worth upgrading to the aftermarket.

How many lbs is the one you are running in that video?
Yeah dude — on the get up, it's tough. After redline + shift? Butter... the flywheel weighs ~12 pounds. I know yours is your daily... if you can live with what sounds like a dying dual mass, do it! 😅
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      01-22-2021, 03:14 PM   #14
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Quote:
Originally Posted by Biginboca View Post
So from what I’ve read the n52 came with 2 different flywheels through the production run. Going by my poor memory one was like 17lbs and the other like 23 or something.....
Any chance you remember if the older 2006's have the heavier flywheels?
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      01-22-2021, 03:41 PM   #15
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Quote:
Originally Posted by Volasko View Post
Any chance you remember if the older 2006's have the heavier flywheels?
I really can’t remember what years had what, and I tried to find the source of the info again and couldn’t
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      01-22-2021, 05:36 PM   #16
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Someone just called my shit slow because of my short gears. deleting my account, bois. Take care. 🥲
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      01-23-2021, 04:58 AM   #17
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Someone just called my shit slow because of my tall gears. deleting my account, bois. Take care. ��
Isn't the 3.91 way shorter than the stock 3.15 diff? If anything it should be much faster since you can stay within the power range after shifting. You are shifting a bit early though around 5500. Do you still have the sc on? I didn't hear it in the video. BTW is there any option to increase throttle response without as much NVH? I was thinking of doing the valeo single mass once my clutch is dead but since it weighs the same is there any difference?
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      01-29-2021, 04:57 AM   #18
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Quote:
Originally Posted by Biginboca View Post
Quote:
Originally Posted by Noir View Post
3 videos for you, OP.

https://youtube.com/channel/UCe7Jg1e5qVN5t1dK4w__OXQ

Sorry for the rough camera work — poor use of certain words (kept saying vibration when I meant to say chatter, at times). But hopefully this helps you make a decision. That flywheel is really bad ass.
Awesome thanks for posting that Noir !!

So from what I've read the n52 came with 2 different flywheels through the production run. Going by my poor memory one was like 17lbs and the other like 23 or something. I'm sure the info comes up if anyone is interested enough to search.

I did the research for mine and I have the lighter oem flywheel. Comparing mine to your video I can't really see any difference, but I'm sure the S/C adds some drag and momentum to your set up also. I wonder if you have the lighter oem flywheel if it's worth upgrading to the aftermarket.

How many lbs is the one you are running in that video?
Earlier n52 came with a heavier one or lighter one? Does it make a difference in durability?
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      01-29-2021, 07:56 AM   #19
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2one3E90, durability is to be seen. If there is chatter, I can't imagine the fly wheel slapping against the clutch often being a good thing, but we will see. The original dual mass* fly wheel is at least two times as heavy? Or it may be 25 pounds...
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      01-29-2021, 07:56 AM   #20
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Quote:
Originally Posted by 2one3E90 View Post
Earlier n52 came with a heavier one or lighter one? Does it make a difference in durability?
I can’t remember and I looked for the info again last week and couldn’t find it. I bet if you went on realoem and looked up the parts numbers and all the “superceded by” part numbers you could find out. (Realoem has weights listed for part numbers)
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      06-24-2022, 05:43 PM   #21
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Quote:
Originally Posted by Volasko View Post
Are there any good light weight fly wheel options for the N52? Something that still would be fine to street drive but still noticeable with improved performance?
Old thread, but I'm currently running a dkm organic twin disk (comes with single mass) and a ati Harmon balancer, I think the car revs a foot bit faster
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      05-10-2023, 11:13 PM   #22
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Ressurecting an old thread because I just installed the JB Racing Lightwheel Flywheel (12lbs). I took videos of the gear chatter in gear and in neutral. Its significant but worth it IMO for my mainly track focused use. 1st through 3rd feels might much lighter on its feet. The fast dropping revs are also appreciated for performance driving.

In Gear:

In Neutral:

WOT 1st through to 4th:

Last edited by Volasko; 05-10-2023 at 11:29 PM..
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