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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 10-18-2007, 07:49 AM   #1
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Performance Clutch

Im thinking of upgrading my clutch to some kind of performance one with a lightened flywheel.

Does anyone know of a good place to get a performance clutch/flywheel for a saab 9-3 viggen other then genuinesaab.com, im just kinda shopping around to see what the best deal would be since i dont plan on changing th clutch for awile

thanks for any help
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Old 10-18-2007, 07:58 AM   #2
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Quote:
Originally Posted by chieffo View Post
Im thinking of upgrading my clutch to some kind of performance one with a lightened flywheel.

Does anyone know of a good place to get a performance clutch/flywheel for a saab 9-3 viggen other then genuinesaab.com, im just kinda shopping around to see what the best deal would be since i dont plan on changing th clutch for awile

thanks for any help
GS is the only place that has a billet flywheel.
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Old 10-18-2007, 08:11 AM   #3
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www.maptun.com, plan to ship from sweden.

Anybody could sell you the viggen clutch and pp combo.

http://www.saabperformanceparts.com/index.htm
Swedish dynamics looks like they have stuff too.
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Old 10-18-2007, 08:14 AM   #4
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i'd just go threw GS get a Spec clutch and flywheel, with viggen PP.
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Old 10-18-2007, 08:28 AM   #5
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nicks fly wheels makes me a little nervous being only 7.5 lbs...
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Old 10-18-2007, 08:35 AM   #6
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abbott racing has had them for a while, but they're pricy due to the poor exchange rate
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Old 10-18-2007, 08:37 AM   #7
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Quote:
Originally Posted by saab4life93t View Post
nicks fly wheels makes me a little nervous being only 7.5 lbs...
he doesn't machine them down anymore, it is a spec billet aluminum flywheel. which are always around 7.5 lbs.
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Old 10-18-2007, 08:42 AM   #8
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that just seems too light going from 15 or so down to 7.5 seems crazy and not so good on the motor...
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Old 10-18-2007, 09:55 AM   #9
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my .02 -if you don't need a clutch, i would consider a clutch upgrade to be one of the last mods for a viggen....there are many much more cost effective modifications. if your clutch is on the way out, then it makes sense to go for the upgrade
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Old 10-18-2007, 10:37 AM   #10
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that just seems too light going from 15 or so down to 7.5 seems crazy and not so good on the motor...
Teddy, this is removing spinning mass outside of the engine, like turning off/ removing the AC, how do you think it would hurt the motor?
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Old 10-18-2007, 10:48 AM   #11
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If you goto a lightweight fly wheel you just have to adjust your driving style to suit it better since it will a.) drop revs quicker when put in neutral (don't want to stall it now) and b.) Will require a higher rev point when getting started from a stop to generate the torque (but only when starting from a dead stop). Once you've figured that out its perfect. With less rotating mass you have a lower total inertia which makes it easier for the engine to work.



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Old 10-18-2007, 10:52 AM   #12
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b.) Will require a higher rev point when getting started from a stop to generate the torque (but only when starting from a dead stop).
but a lightened flywheel will give you less torque.
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Old 10-18-2007, 10:53 AM   #13
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but a lightened flywheel will give you less torque.
At what point in the curve?
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Old 10-18-2007, 10:56 AM   #14
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At what point in the curve?
threw out the whole curve, that is why the viggen has such a huge flywheel they wanted to get more torque out of it.
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Old 10-18-2007, 10:58 AM   #15
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I wonder if nick or anyone has any comparisons of cars with stock flywheels and then only changing the flywheel and seeing the difference.

If it spools faster, you may spend more time with more torque, though the total torque is never greater at a given rpm, if you know what i mean.
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Old 10-18-2007, 11:00 AM   #16
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Quote:
Originally Posted by Red DIC View Post
I wonder if nick or anyone has any comparisons of cars with stock flywheels and then only changing the flywheel and seeing the difference.

If it spools faster, you may spend more time with more torque, though the total torque is never greater at a given rpm, if you know what i mean.
i know that the viggen flywheel weighs quite a bit more then the reg. 9-3.
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Old 10-18-2007, 11:04 AM   #17
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I'm sure Nick can and will get a dyno graph with the light weight flywheel in eventually.

However in response to moose, when you use a huge flywheel it requires more force to generate the torque so in reality you end up with a much slower acceleration. When manufacturers determine a flywheel weight for a vehicle they choose a heavier flywheel for the purpose of smooth driving and extended coast times at higher speed which aid in cruise control settings.

If you put a stock saab and a stock saab with the lightweight wheel the one with the lightweight wheel will out accelrate the car with the stock flywheel. I'll take the lightweight flywheel and probably a small hit in the max torque number.

I also bet the viggen flywheel weighs close to the same as the 9-5 aero flywheel.



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Old 10-18-2007, 11:07 AM   #18
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Quote:
Originally Posted by NahumCC View Post

If you put a stock saab and a stock saab with the lightweight wheel the one with the lightweight wheel will out accelrate the car with the stock flywheel. I'll take the lightweight flywheel and probably a small hit in the max torque number.

flywheel.
oh no doubt that it will accel. faster i thought you were saying that you get more torque when using the lightened flywheel.
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Old 10-18-2007, 11:12 AM   #19
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Quote:
Originally Posted by moose View Post
oh no doubt that it will accel. faster i thought you were saying that you get more torque when using the lightened flywheel.
No lol. I was stating that when launching from a dead stop you will need to launch from a higher rev to achieve your normal launch as the lighter mass will require a higher acceleration to achieve the torque. However picking a specific rpm doesn't get your acceleration as that is a rotational velocity. How much gas you give it and the rate that the engine climbs to that RPM is your acceleration in terms of rotation. That is why I don't think it would be a huge hit on torque over the graph since the accerlation between a full weight fly wheel and light weight wheel are gonna be quite drastic.

Hypothetical example.
Stock wheel takes say 2 seconds to accelerate from a steady velocity of 900 rpm from idle to say 2000 rpm.
Lightweight wheel lets say takes 1.2 seconds to accelerate from a steady velocity of 900 rpm from idle to 2000 rpm.

In this hypothetical example you've nearly dropped the time it takes to accelerate to a given rpm by half the original time which would give you nearly double the stock rate of acceleration. Now if you assume your light weight wheel is exactly half the original weight then you recieve no hit on torque when accerlerating. But if you launch from holding at 2000 rpm then it becomes an equation focused on component vectors and friction. My head hurts now.



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Last edited by NahumCC; 10-18-2007 at 11:18 AM.
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Old 10-18-2007, 11:21 AM   #20
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That is why I don't think it would be a huge hit on torque over the graph since the accerlation between a full weight fly wheel and light weight wheel are gonna be quite drastic.
ya i'd say maybe 5 ft.lbs. at most.
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