Setting pinion angle with BMR TA.
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Joined: Nov 2000
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From: Kansas City suburb of
Setting pinion angle with BMR TA.
I read the directions but after getting in there and putting the angle finder on the driveshaft I think I got 4 degrees postive?
If the needle is left of zero it is negative correct? If the needle is right of zero it is positive?
But the mounting plate on the rear end is hard to get to and I don,t think the reading I got is correct, It seems to be 8 degrees positive. So I take 8 degrees positive and subtract 4 degrees positive I would have 4 degrees positive,????????
I can get the angle finder on the TA mounting plate pretty easy, is it ok to measure there?
I am totally lost.
If the pinion on the rear is pointing up that is negative or positive?
I posted this in the drag racing forum as well, hoping to get the car on 4 wheels and moving today.
If the needle is left of zero it is negative correct? If the needle is right of zero it is positive?
But the mounting plate on the rear end is hard to get to and I don,t think the reading I got is correct, It seems to be 8 degrees positive. So I take 8 degrees positive and subtract 4 degrees positive I would have 4 degrees positive,????????
I can get the angle finder on the TA mounting plate pretty easy, is it ok to measure there?
I am totally lost.
If the pinion on the rear is pointing up that is negative or positive?
I posted this in the drag racing forum as well, hoping to get the car on 4 wheels and moving today.
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Joined: Oct 2001
Posts: 1,007
From: Folsom, CA, USA
This is always hard to describe in words. I have a page at http://www.go-fast.org/z28/pinionangle.html that may help.
But stand back and look at the overall goal here. Assuming you're shooting for a small negative pinion angle, the driveshaft and pinion (sure, bottom of the TA bracket is probably fine) should look like a "\/" pointing down, rather than "/\" pointing up. So from the left side of your car, measure the driveshaft angle. If it's pointing downwards to the right (fiddle with the angle finder to convince yourself of this) then whatever angle it's measureing is "down", then call that a negative value. Do the same thing with the pinion - if it's pointing down to the right it's negative else positive. Then do your math and you're off and running.
Dave
But stand back and look at the overall goal here. Assuming you're shooting for a small negative pinion angle, the driveshaft and pinion (sure, bottom of the TA bracket is probably fine) should look like a "\/" pointing down, rather than "/\" pointing up. So from the left side of your car, measure the driveshaft angle. If it's pointing downwards to the right (fiddle with the angle finder to convince yourself of this) then whatever angle it's measureing is "down", then call that a negative value. Do the same thing with the pinion - if it's pointing down to the right it's negative else positive. Then do your math and you're off and running.
Dave
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Joined: Nov 2000
Posts: 2,734
From: Kansas City suburb of
Thanks Dave, I had it all backwards.
I will just set it at zero for now so I can work out any suspension bugs with the new front suspension, springs and shocks.
Need an alignment too.
Thanks again.
I will just set it at zero for now so I can work out any suspension bugs with the new front suspension, springs and shocks.
Need an alignment too.
Thanks again.
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Registered User
Joined: Nov 2000
Posts: 2,734
From: Kansas City suburb of
Was going back through some old magazines and in Suspension Tire and Wheel (a special that Hot Rod did) it has an article that says that the pinion should point up for negative angle and down towards the ground for positive angle.
Now in a caption under one of the pics they talk about the pinion should point down for drag racing applications, but according to the article that would be positive not negative.
I am totally confused now.
Both of you experts agree on the pinion pointing down as the best for racing so I will call that negative and be done with it.
I have it set pretty close to zero now (both measurments nearly the same) so I will stick with it.
Now in a caption under one of the pics they talk about the pinion should point down for drag racing applications, but according to the article that would be positive not negative.
I am totally confused now.
Both of you experts agree on the pinion pointing down as the best for racing so I will call that negative and be done with it.
I have it set pretty close to zero now (both measurments nearly the same) so I will stick with it.
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