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Minimum pinion angle for the track

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Old Aug 30, 2009 | 03:45 PM
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Default Minimum pinion angle for the track

I am currently running -1.3 and it will shake violently at 110+. Never noticed anything on the street as I do not drive that fast. I know I need to take some of that 1.3 out of the angle but at the same time I do not need the angle to go positive on launch. I have full rod end suspension. I thought I read somewhere that the rod end suspension cars did not need to run as much negative angle.
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Old Aug 30, 2009 | 05:01 PM
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I've heard guys setting it at -4*
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Old Aug 30, 2009 | 05:51 PM
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I think by the time it is all said and done I might be down there as well.
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Old Aug 30, 2009 | 07:35 PM
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I have a full suspension , with drag bar and adjustable shocks and I run -3 pinion angle.
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Old Aug 30, 2009 | 07:56 PM
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Is that 3 or .3?? Thanks for the help guys.
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Old Aug 30, 2009 | 08:04 PM
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how do you even calculate such a precise pinion angle down to the tenth exactly? I'm at -2 with all rod end suspension in the rear, poly mounts or rubber mounts will want more pinion angle due to deflection typically. If you're not getting vibration until that high a speed I'd be looking at tires or driveshaft myself.
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Old Aug 30, 2009 | 08:27 PM
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I run mine at about -1/2 degree. More pinion angle only does one thing: Add a bind to the drivetrain.
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Old Aug 30, 2009 | 08:57 PM
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Thanks guys. I will reset it to around -.5 and see what it does.
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Old Aug 30, 2009 | 08:59 PM
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Originally Posted by xpndbl3
how do you even calculate such a precise pinion angle down to the tenth exactly? I'm at -2 with all rod end suspension in the rear, poly mounts or rubber mounts will want more pinion angle due to deflection typically. If you're not getting vibration until that high a speed I'd be looking at tires or driveshaft myself.

Using a smart level. It is not tires or d shaft. Def it the driveline angle.
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Old Aug 30, 2009 | 09:11 PM
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Originally Posted by 03 BUSA
Is that 3 or .3?? Thanks for the help guys.
-3* total deg.
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Old Aug 31, 2009 | 10:04 AM
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Why would you need that much angle in your drivetrain?? Just trying to figure out the differences between different setups. One has -.5 and the next has -3. Big split there. Althought the guy with -.5 does have a nice pic of a great wheelstand so I am sure it is not hurting his setup. LOL.
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Old Aug 31, 2009 | 10:48 AM
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i think the more negative you have the more initial bite you will get. unfortunately it comes with down sides as well. i think mine is around -2* or so. with good suspension parts that won't distort you can get away with less angle and still hook great.
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Old Aug 31, 2009 | 11:10 AM
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Originally Posted by 03 BUSA
Althought the guy with -.5 does have a nice pic of a great wheelstand so I am sure it is not hurting his setup. LOL.
Kind of my point. If the car can do that with a couple adjustments of the shocks and the travel limiters... I'd say the pinion angle is o.k.
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