So I have discovered the culprit to wiggle in the rain. - The Saab Link Forums

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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 01-06-2007, 12:59 PM   #1
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So I have discovered the culprit to wiggle in the rain.

OK, just got back from oil change and wheel alignment. The rear end is way out and they say the only way to fix that is body shop. Apparently the rear has no adjustment?

Here are the measurements for the rear on the printout I was handed

These are all in degrees.

Camber:
Left Rear: -2.3
Right Rear: -2.5

Toe:
Left Rear: .52
Right Rear: .48
Total Toe: 1

Worst part about this is that you only notice it in the rain. I don't have money for a body shop and still have to get my other car back home.



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Old 01-06-2007, 01:06 PM   #2
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glad you figured out what it was
how much is it going to cost to fix? did you get a quote yet?
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Old 01-06-2007, 01:09 PM   #3
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No quote yet, I'll get to that eventually but slowly. May have to part 9k now to be able to pay for it all. In the meantime, car will be driven very carefully in the wet. Why the fuck make a car where the suspension can't be adjusted damnit.



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Old 01-06-2007, 01:59 PM   #4
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That's more common than you think.

I have had a couple of cars that the rear end was not adjustable at all.

Sorry to hear it.
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Old 01-06-2007, 02:49 PM   #5
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We adjust the rear at work with equipment that bends the axle and such. Not hard, but definatly not as easy as doing the front.
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Old 01-06-2007, 03:02 PM   #6
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Sorry to hear that.
My truck also has no rear adjustment.

good luck
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Old 01-07-2007, 11:43 AM   #7
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No rear adjustment is a rather common thing. Glad you figured it out though. Alot of FWD Japanese cars have adjustments in the rear, ie Camry, Corolla, Sentra, most likely the Civic but I've never had to align one of those.
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Old 01-07-2007, 12:09 PM   #8
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i need an alignment but have no money
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Old 01-07-2007, 12:34 PM   #9
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yeah, very common. the C-900, 9000, NG-900, 9-3 and 9-5 have no rear adjustments, however you can adjust many of them with shim plates. you usually have to whack it pretty hard to knock the 900 or 9000's beam axle out of alignment, did you hit something? My C-900's was so far off, I just opted to replace it with a junk yard unit. $45 and a few hours later, I had a correctly aligned car.
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Old 01-07-2007, 12:34 PM   #10
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I haven't but I am the fourth person with this car.



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Old 01-07-2007, 03:47 PM   #11
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yeah a new rear end will likely correct it. Thats some bad neg. camber, you'll prolly see some tire wear from that.
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Old 01-08-2007, 06:54 AM   #12
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Ouch! Yeah...if you went to lower your car you'd have -3 camber or more on those wheels....which would be fine on a dry autocross course, but a little hairy in the wet...

The rear axle is very simple tubed dead axle...I wonder if you could jack the rear up, unbolt it, and just drop it off at a frame alignment place and have them stick it in a jig and tweak it a bit, then you could reinstall it...you'd probably save a fair amount of money and it could be done in a day. Most of the cost associated with this would be the labor time to take the axle off and put it back on, which you could do yourself.

My car with lowering springs has about -1.3 or so on each rear...feels fine in the wet and is quite good in the dry. I wish I could adjust the rear with shims though, which you can do on the 9-5.
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Old 01-08-2007, 07:26 AM   #13
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Mine is the same way, but I am refinishing and building up a nice looking later model rear axle.
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Old 01-08-2007, 08:58 AM   #14
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I have developed a couple different shims to adjust the rear camber on these cars, When you modify the springs and roll bars you need far less camber in the rear. Usually we aim for around -1 deg The shims are available in .3 or .6 degree to get to the target, I would not recommend using more than 2 per side. We have tested more but just not a good idea. Best part is they are quite easy on the 900/9-3 the 9-5 is a bit harder.
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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 01-08-2007, 12:08 PM   #15
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Nick in your opinion would at least fixing the camber take care of the very bad handling in the rear when its wet or going over a big enough of a bump?



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Old 01-08-2007, 12:12 PM   #16
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Quote:
Originally Posted by GenuineSaab View Post
I have developed a couple different shims to adjust the rear camber on these cars, When you modify the springs and roll bars you need far less camber in the rear. Usually we aim for around -1 deg The shims are available in .3 or .6 degree to get to the target, I would not recommend using more than 2 per side. We have tested more but just not a good idea. Best part is they are quite easy on the 900/9-3 the 9-5 is a bit harder.

Hey Nick...I saw these shims listed in the 9-5 suspension section of your site, but not in the 9-3 section. Will these shims work on the 9-3 axles?
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Old 01-08-2007, 12:23 PM   #17
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Quote:
Originally Posted by NahumCC View Post
Nick in your opinion would at least fixing the camber take care of the very bad handling in the rear when its wet or going over a big enough of a bump?
My thought is that the toe is more critical to straight line stability, but I don't know what the toe spec is for the rear axle of the 9-3. But regardless, you need to correct that camber some...the toe isn't extreme in your case.
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Old 01-08-2007, 01:24 PM   #18
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http://www.genuinesaab.com/catalog/p...roducts_id=439

It was in the 9-3 spare parts.

It will help the problem for sure to get the camber back to near acceptable.
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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 01-08-2007, 01:27 PM   #19
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Quote:
Originally Posted by GenuineSaab View Post

It was in the 9-3 spare parts.
Ahh, sweet...thanks for that! Maybe I'll get some of these to play with for the next autocross season.
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Old 01-09-2007, 01:51 PM   #20
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So I was looking around for the actual rear axle specs to see how far I was out and remember abbott has an uprated rear axle. So I said what the hell and went to take a look (know I can't afford it anyways) and it was 500 pounds.

http://www.abbottracing.com/2003/tun.../9-3_raxle.htm



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