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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 08-25-2008, 02:43 PM   #1
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lightweight flywheel

installing this this weekend in conjunction with a spec clutch and viggen pp. Going on a b204 motor. I was reading in the other thread about balancing the flywheel in conjunction with the pp and clutch....I haven't heard of this before. I was thinking I could just pull all the old parts out....and put in the new ones. Anyone know why I shouldn't do that?
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Old 08-25-2008, 03:07 PM   #2
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installing this this weekend in conjunction with a spec clutch and viggen pp. Going on a b204 motor. I was reading in the other thread about balancing the flywheel in conjunction with the pp and clutch....I haven't heard of this before. I was thinking I could just pull all the old parts out....and put in the new ones. Anyone know why I shouldn't do that?
Of course you can do that but you can also balance both the pp and flywheel which will help the engine run smoother and more efficiently.
I just did this on the B234 I'm building. I actually had the flywheel lightened by 3 pounds, resurfaced, and balanced. Way cheaper than going with an aluminum one.
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Old 08-25-2008, 03:36 PM   #3
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How do you do that. Take the flywheel and pressure plate to a machine shop?
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Old 08-25-2008, 03:53 PM   #4
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well the aluminum one is MUCh lighter than 3lbs versus stock. Plus it has a removable friction surface which will be nice one day instead of getting a resurface. It also offers less downtime for the car which is important to me. I just don't see how balancing the clutch is necessary, i mean the clutch will be stuck to the flywheel when engaged anyways. I suppose having all the weight distributed evenly for rotating surfaces can be important, but I feel that would only impact the clutch during engagement and not while applying power.
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Old 08-25-2008, 04:24 PM   #5
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do you need to remove the oil pan in order to remove the end plate to get to the rear main seal, or can you just replace it once the flywheel is off?
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Old 08-25-2008, 04:32 PM   #6
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Are you putting an ALum flywheel on a daily or street driven car? It may be hard to keep it rolling with the engine engaged. WHen you lift off with a super light flywheel yor car's revs will just die...

Unless that is what you want then cool...
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Old 08-25-2008, 04:36 PM   #7
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Are you putting an ALum flywheel on a daily or street driven car? It may be hard to keep it rolling with the engine engaged. WHen you lift off with a super light flywheel yor car's revs will just die...

Unless that is what you want then cool...
I have been fine with the Spec Flywheel. I have not stalled the car or had any issues. It's taking awhile getting it just right and getting to be smooth consistently.
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Old 08-25-2008, 04:49 PM   #8
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yeah its my DD. It'll take some getting used to for sure. I've really only heard positive reviews on it.
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Old 08-25-2008, 06:35 PM   #9
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I have been fine with the Spec Flywheel. I have not stalled the car or had any issues. It's taking awhile getting it just right and getting to be smooth consistently.
about how long has it been since the install?? is it hard to get used to??
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Old 08-25-2008, 06:51 PM   #10
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about how long has it been since the install?? is it hard to get used to??
700 miles. Not really, takes a few days. But if I drive another car for a few days it takes a few minute adjustment once I get back into the Vig.
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Old 08-25-2008, 07:07 PM   #11
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Its not hard to get used to the Spec light weight wheel at all. I've had mine in since November 2007 and the revs drop only a little quicker then on the stock wheel but nothing that would cause the car to stall. It catches itself perfectly at idle. Running WOT is where you really notice it.

As Jameson said though the clutch work for getting in first takes some getting used to have the right revs to start from. A little low and you bog out, a little high and you slip it. The clutch package itself will really determine the true characteristics. I've got a stock viggen clutch setup so its not grabby like a spec would be.



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Old 08-25-2008, 09:56 PM   #12
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I slip it pretty good for the first 2/3, and give it a nice "pop" at the top.


I have had chatter once using that method.
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Old 08-25-2008, 10:04 PM   #13
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Spec Stg. 2 Clutch + Spec Flywheel + Viggen PP = a couple hours to learn how it drives. (B204- stg 0.25 -basically stock-)

It's really not that hard. A little more slip, then once she catches you let her go- thats about it.

basically my impressions after 4000 miles of this setup-
really nice when you get on it WOT- the R's climb quick.
sounds pretty good at a stop light.
overall, nicer to drive in my opinion.
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Old 08-25-2008, 11:26 PM   #14
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[QUOTE=turbo9three;497254]Spec Stg. 2 Clutch + Spec Flywheel + Viggen PP = a couple hours to learn how it drives. (B204- stg 0.25 -basically stock-)

my clutch is almost gone. im thinkin about getting this setup. you have this setup yourself?
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Old 08-25-2008, 11:37 PM   #15
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my clutch is almost gone. i'm thinkin about getting this setup. you have this setup yourself?

Yes, I do.
I pretty much love it. not too hard to drive around town, and definitely nice in the high R's.

put a Quaife in too!!!
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Old 08-26-2008, 06:16 AM   #16
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The rest of the rotating assembly in these cars is so heavy they still feel like stock with a light flywheel. If you make changes to the software to match, allowing it to drop revs quicker but making it catch a little harder down low then it is an amazing change.

Most setups would be fine with a Vig clutch and drive much nicer too!

Quaife, its a shame that they are such a pain to fit. Makes such a nice difference.

I would only listen to those that have the light flywheel in a NG/9-3
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2.0 GOOSE 500whp + 8500rpm = 11.06 @125 E85
Viggen 439whp / 447tq 12.43 @114 on Gt2871.64, (Now 511whp Gt3076)
Nordic E85 9-3 SS Aero 320hp / 350ftlbs
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Old 08-26-2008, 06:18 AM   #17
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The rest of the rotating assembly in these cars is so heavy they still feel like stock with a light flywheel. If you make changes to the software to match, allowing it to drop revs quicker but making it catch a little harder down low then it is an amazing change.

Most setups would be fine with a Vig clutch and drive much nicer too!

)
Is it possible to have a software adjustment for the flywheel done on my Nordic tune, or does that count as a custom tune?

I am going to try out the latest tune sent to me this week.
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Old 08-26-2008, 03:09 PM   #18
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The rest of the rotating assembly in these cars is so heavy they still feel like stock with a light flywheel. If you make changes to the software to match, allowing it to drop revs quicker but making it catch a little harder down low then it is an amazing change.

Most setups would be fine with a Vig clutch and drive much nicer too!

Quaife, its a shame that they are such a pain to fit. Makes such a nice difference.

I would only listen to those that have the light flywheel in a NG/9-3
Just saying I don't think it's worth the money when you can lighten and balance for a lot less. Lightweight flywheel only really makes a small difference in 1st and 2nd gear anyways. And yes balancing components will help especially those that have high mass and moments associated with them. Last time I checked a flywheel and pressure plate weighs alot more than a piston and rod assembly.

Nice Nick, looks like you'll get to sell some tunes to go with the flywheels!
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