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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 08-16-2013, 10:03 PM   #1
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GS Poly engine mounts

Does anybody have experience with the polymounts?

I have now 3 poly mounts installed and in addition to that,
And at the same time my balance chain was cut, plus the car has a full 3" exhaust.

- a lot of drowning and vibrations throughout the body, too much for my taste.
The mounts give a great driving feel though, in particular steering + braking response is super sharp. The car feels more like a track car from my perspective ands needs to be made softer again. Does anybody has complete polymounts with balance shaft?

I wounder if that would be sufficient to cut vibration to a better level?
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Old 08-16-2013, 10:15 PM   #2
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I have the transmission and the right motor mount from GS.. As well as no balance shafts... It is.. Different. You have to get used to driving the car. It feels different at any given rpm than before. Balance shaft delete should only vibrate at certain rpms. The mounts are the culprit.
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Old 08-17-2013, 06:17 AM   #3
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I have all the mounts on my Viggen, and maintained the balance shafts. It's not bad at all.

My engine is race balanced though, and I do have an older version of all the mounts. The rear in particular is the older design that I believe is no longer sold.

Cutting the balance shafts is a bad idea IMO.
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Old 08-17-2013, 06:39 AM   #4
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I pulled the balance shafts from my viggen :P. And have all 3 mounts. But my entire rotating assembly has been balanced

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Old 08-17-2013, 10:31 AM   #5
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Thanks for all the comments,
I think I understand now a little bid more.

I agree that cutting the b. shaft is not really
a good idea, unless it is all balanced.
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Old 08-17-2013, 10:37 AM   #6
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Quote:
Originally Posted by danieljordanmaddux View Post
I pulled the balance shafts from my viggen :P. And have all 3 mounts. But my entire rotating assembly has been balanced

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What exactly did you balance, what is the rotating assembly?
clutch, pressure plate, and flywheel,
Or
The complete engine and complete clutch assembly.
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Old 08-17-2013, 04:27 PM   #7
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Quote:
Originally Posted by Drew in Houston View Post
I have all the mounts on my Viggen, and maintained the balance shafts. It's not bad at all.

My engine is race balanced though, and I do have an older version of all the mounts. The rear in particular is the older design that I believe is no longer sold.

Cutting the balance shafts is a bad idea IMO.
What is a race balance? Lol, does your machine shop only get so precise due to what you ask for? As in race balance? What else do they offer?

I deleted balance shafts, had my rotating assembly weight matched to 1/10th of a gram... Crankshaft balanced, flywheel and pressure plate assembly balanced, and my harmonic balanced/crank pulley balanced.

http://www.saabcentral.com/~munki/te...nce_shafts.htm

That is a quick read on why Saab implemented Balance shafts into these engines...
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Old 08-18-2013, 06:51 AM   #8
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My shop did whatever I asked them to do. Actually, they farmed-out the balance work. I never did hear any specific weights, shoulda asked but never did, anyway they warranted the work to 10,000 rpm on both B205 and 235's that I took to them. Since then I've moved so I have to find a good shop that's a little closer.. That was stock rotating assembly with the exception of JE pistons.

Quote:
Originally Posted by 93viggen View Post
What is a race balance? Lol, does your machine shop only get so precise due to what you ask for? As in race balance? What else do they offer?

I deleted balance shafts, had my rotating assembly weight matched to 1/10th of a gram... Crankshaft balanced, flywheel and pressure plate assembly balanced, and my harmonic balanced/crank pulley balanced.

The Saab NG900 - Technical - Engine - Balance Shafts

That is a quick read on why Saab implemented Balance shafts into these engines...
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Last edited by Drew in Houston; 08-18-2013 at 06:55 AM.
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Old 09-16-2013, 06:51 AM   #9
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Quote:
Originally Posted by Mato View Post
What exactly did you balance, what is the rotating assembly?
clutch, pressure plate, and flywheel,
Or
The complete engine and complete clutch assembly.
The crank is balanced, rods and pistons weight matched, clutch assembly balanced, and I had the rods (b204 rods) and crank shot peened before I put it all back together

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