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UPR double adjustable UCA's pinion angle help

red94cobra 03.01.2018, 12:58
I just got some adjustable UPR control arms and I was wondering how long (end-to-end) they need to be to acheive -2* pinion angle. I have non adjustable UPR lowers, Tremec 3550, custom length alum. DS and a 5/8ths DS spacer. Stock height springs. FWIW my pinion angle is +2* at the moment. Would that be enough to cause a decent vibration?
foxchassisfreak 03.01.2018, 23:40
Put a pinion angle tool on it and adjust until desired angle is reached. I don't see +2 causing a vibration but it could be wrong. Last time I had a vibration, it was an out of balance driveshaft
FiveLeeter 12.01.2018, 22:34
Yea pick up a digital angle finder (Harbor Freight has them for $30, Sears has them for $150 but it's same picture)

Sears:
....

Harbor Freight:
....
Mr. Red Pony 25.01.2018, 04:57
More than .5 difference will cause a vibration.
circletrack5.0 25.01.2018, 05:35
why are you wanting -2 degrees of pinion angle?
red94cobra 26.01.2018, 04:09
I was told it was optimum for drag racing.
RAZRS EDGE 26.01.2018, 05:05
First off, how did you measure your current pinion angle?
red94cobra 26.01.2018, 06:58
I took it to my exhaust guy, he put a straight edge on the flange and then put an angle finder on the straight edge.
donsbad89 26.01.2018, 07:15
-2* is ideal. I wouldn't go past neutral.
circletrack5.0 26.01.2018, 08:14
how did -2 degrees become "optimal" for every car? what about a car with four solid rod ends verses a car with stock bushings? what about a car with altered bar angles? 1000hp verses 250hp?

has anyone ever mounted a camera under the car to monitor the pinion during a race?
red94cobra 26.01.2018, 09:36
Wes... lay off a little, it's not that big of a deal. I was trying to solve a vibration, and it worked. I'm not that worried about getting caught up in a tenth of a degree. It's fixed and working, leaves hard, and that's all that matters.
circletrack5.0 26.01.2018, 10:30

Originally Posted by red94cobra:

Wes... lay off a little, it's not that big of a deal. I was trying to solve a vibration, and it worked. I'm not that worried about getting caught up in a tenth of a degree. It's fixed and working, leaves hard, and that's all that matters.

unwanted you have seriously damaged my self esteem! weeps
red94cobra 26.01.2018, 11:35
Nothing personal man, it's where it's at and that's all that matter.
BlckCobra 22.02.2018, 04:27
Did you get your vibration fixed? I had a real bad one when i went auto and ended up being u joints
stormy69 31.05.2018, 04:55

Originally Posted by circletrack5.0:

unwanted you have seriously damaged my self esteem! weeps

lol
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