Dragula

iTrader: (5)

I went to the track a few weeks ago and when I finished my 1/4 mile run and coasted down I noticed a fluttering from the car. (Maybe a light vibration) I have a 3* pinion angle (-.5 pinion & 2.5 Driveshaft). Could this be the source of the "flutter" It only happens at the track (high speeds) not on the street. I would like to fix it today so any expert opions would be greatly appreciated.

MADMAN

iTrader: (4)

The angle you are describing is u-joint angle not pinion.

To set pinion angle get the car at ride height with the pinion facing straight up and down. Set your anle finder on the pinion yoke. This is your pinion angle.

Dragula

iTrader: (5)

Is this too much pinion or U joint angle

Dragula

iTrader: (5)

*ttt*

MADMAN

iTrader: (4)

You should have about 2 degrees of PINION angle.

JS

iTrader: (4)

Madman how do u adj. at that point....

MADMAN

iTrader: (4)

We set all our cars with 2 dgrees. Any adjustments are shock and tire pressure related, unless you are running my T/A.

JS

iTrader: (4)

Do u run shock at different setting from right to left depending how the car is leaving?
EG left from at 3 and right front at 5

I would think u want the rear right shock tighter or the air bag pressure jacked up.Unless your running a anti-drag,then u set it for load on the right side.Some people say u shouldnt set shocks at different settings?

Now if I take my measurement from the pinion,then where do I get the other measurement and what gets adjusted on the tq arm?

MADMAN

iTrader: (4)

The pinion angle is referenced from the ground. That is your first number. Then the angle of the pinion is the second number.

Example:
Ground is "0" your pinion is "88" down this means you have 2 dgrees down or negative pinion angle.

You adjust this with the adjuster on the T/A. I dont like to run one shock tighter than the other especially with single adjustables because you are tightening compression and rebound at the same time. I recommend a good antiroll bar. We also shim the passenger spring to get the scale readings I want to get the car to go straight.

JS

iTrader: (4)

Thanks Madman,one more question can I get the pinion agle off the yoke with the driveshft in the car or will I need to pull the shaft off the yoke.......

I dont have the ARB yet but I guess jacking the airbag up to 25lbs will have to do for now.

I'm gonna reset my tq arm this weeked in the shop on level ground.
Should I sit in the car when we set it?

MADMAN

iTrader: (4)

You can set pinion with the driveshaft in the car. What I do is rotate the pinion until the ujoint that is in the rearend yoke is up and down. Then take a 5/8 socket and set it on the u jiont cap. set your angle finder on the socket. I would sit in the car to be exact..

JS

iTrader: (4)

Thanks a bunch....

1fastWS6

iTrader: (3)

JS,
Here's what I did last time, made it tons easier.

1) Jack the rear of the car up and pop the hood.
2) Place angle finder on front face of pass. side cylinder head. Jack up car until it reads 0*. Now the engine/trans centerline is exactly level.
3) Place angle finder on bottom of pinion yoke (or TA mount).
4) Set angle.

Much easier than pulling the DS or trying to get the angle finder up on the trans tail shaft to get an accurate measurement. BTW, I found that the bottom of the trans crossmember is also parallel with the centerline of the trans. At least it is on the M6 crossmember.

Craig