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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 05-14-2012, 02:18 AM   #1
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Lighten up my flywheel

Hey there all,

I'm pulling out my gearbox again in a few weeks, my viggen clutch disk shit it's self.
I'm going to try a 6 puck.

I'm going to get the fly wheel machined again and thought I might get a bit of weight taken of the back.

Does anybody how much I can get taken off without causing any drama?

Has anybody else done this?

Cheers
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Old 05-14-2012, 05:55 AM   #2
 
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A couple of folks have had the flywheel milled...You can easily shed a few pounds off the back. There's a raised center portion that makes no sense, except to add mass for smooth shift transitions.
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Old 05-14-2012, 12:34 PM   #3
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Hey there all,

I'm pulling out my gearbox again in a few weeks, my viggen clutch disk shit it's self.
I'm going to try a 6 puck.

I'm going to get the fly wheel machined again and thought I might get a bit of weight taken of the back.

Does anybody how much I can get taken off without causing any drama?

Has anybody else done this?

Cheers
In what way? I ask because I have reason to suspect my viggen PP/disk is failing with the stg 5+ tune. I have to figure out if it's the tires or clutch that is slipping at higher revs-hard to tell...
-Cm
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Old 05-14-2012, 11:56 PM   #4
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In what way? I ask because I have reason to suspect my viggen PP/disk is failing with the stg 5+ tune. I have to figure out if it's the tires or clutch that is slipping at higher revs-hard to tell...
-Cm
My Viggen disk/pp slipped last weekend.

If its your clutch that's slipping you get a filthy smell of the disk (like stinky pussy)
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Old 05-15-2012, 04:58 AM   #5
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i usally lighten ng flywheels 4-6lbs,, i think thats the sweet spot. If you go to light the car sucks to drive

Mike
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Old 05-16-2012, 04:36 PM   #6
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I had about 5 pounds shaved off my non-vig b204 IIRC. No drama in the last 30k miles.
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Old 05-16-2012, 11:41 PM   #7
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i usally lighten ng flywheels 4-6lbs,, i think thats the sweet spot. If you go to light the car sucks to drive

Mike
Hey Mike, please excuse my noobness,

Why does the car suck to drive if the flywheel is to light?
What happens?

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I had about 5 pounds shaved off my non-vig b204 IIRC. No drama in the last 30k miles.
Thanks guys, That's what I wanted.

I'll go 5lb
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Old 05-17-2012, 03:31 AM   #8
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I think the revs will drop too fast, and you'll have to constantly be rev-matching the gear-changes. I'm just guessing.
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Old 05-17-2012, 03:02 PM   #9
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I think the revs will drop too fast, and you'll have to constantly be rev-matching the gear-changes. I'm just guessing.
Bingo

Lightening the flywheel makes a turbo car rev faster and so come on boost faster, however the opposite will also happen i.e. revs drop quicker and you a quick drop off of boost which make gear changes suck.
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Old 05-17-2012, 03:06 PM   #10
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I should add, the lightness of the flywheel should be proportionate to the time spent at WOT. e.g. a drag car sill have a super light flywheel (as always at WOT). However a car you drive on the road won't spend that much time at WOT (traffic, etc).
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Old 05-18-2012, 02:41 AM   #11
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That's good info Brendan.

Maybe I should just leave my flywheel standard ?

After all, it is just the car that gets me to work and back.

Or as mike D & poison beef added 5lb's is the sweet spot ?

Thoughts....
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Old 05-18-2012, 06:44 AM   #12
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when the flywheel gets too light, you also have to rev it very high to start from a stop, hill starts become a royal pain,, This will lead to you burning out your clutch quicker as well
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Old 05-18-2012, 07:08 AM   #13
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I have a fidanza lightweight flywheel on my previous car (fiance's car now) and it is great - heavy flywheels help make driving smoother but the engine feels much less responsive.

Revs do drop faster but just tap the gas lightly to bring them back up - you'll get used to it and the responsiveness is more than worth it.

I'd say the clutch affects drivability much more, like my 9-3 with a stage 3 clutch and stock flywheel is more "difficult" I'd say compared to a lightweight flywheel and stage 1 clutch car...
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Old 05-18-2012, 08:36 AM   #14
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I have the lightweight spec flywheel and standard viggen clutch and it revs quite nicely while still being able to start relatively easy. I do notice coasting in neutral does require more of a blip from the throttle to get back into gear, but that's not really a big deal imo.

However, people at the inspection station always stall it multiple times.
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Old 05-18-2012, 09:58 AM   #15
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I have a fidanza lightweight flywheel on my previous car (fiance's car now) and it is great - heavy flywheels help make driving smoother but the engine feels much less responsive.

Revs do drop faster but just tap the gas lightly to bring them back up - you'll get used to it and the responsiveness is more than worth it.

I'd say the clutch affects drivability much more, like my 9-3 with a stage 3 clutch and stock flywheel is more "difficult" I'd say compared to a lightweight flywheel and stage 1 clutch car...
I have a fidanza as well and what is good about those wheels is that they have a steel friction plate which is replaceable.
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Old 05-18-2012, 11:07 AM   #16
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You will usually hear that shaving a few pounds off the back of the flywheel doesn't produce that much of a difference is driving characteristics. So I'd look at that as an option.
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Old 05-18-2012, 03:09 PM   #17
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You will usually hear that shaving a few pounds off the back of the flywheel doesn't produce that much of a difference is driving characteristics. So I'd look at that as an option.
I'll do that
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Old 05-18-2012, 04:06 PM   #18
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If you like to heel and toe get a spec flywheel or equivalent. I personally prefer a light fly, and enjoying banging through the gears on a twisty road.
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Old 05-20-2012, 04:25 AM   #19
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Removing the balance chain also makes it like having a light fly so I wonder how it is to have both light fly and no balance chain? Never been much of heal and toe guy but I am starting and I really nailed it the other day. I find I need good shoes (Pilotis).
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Old 05-22-2012, 07:40 AM   #20
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I took 4lbs off my stock flywheel when I installed a Viggen Clutch/PP combo on my Stg3 B204. It revs noticeable faster and is perfectly streetable.

A tad more revs required on a hill start and a touch of gas on the down shifts. But, I have always tended to heel/toe my shifts.

I spent $80 to have the flywheel resurfaced and lightened. The Fidanza was around $400. No way was that worth it unless you are building a race car, and we all know how silly NG900/OG9-3 race cars are.
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