6 replies to this topic

[mika03au]

After some tips to set the correct alignment for the diff/tailshaft.

I have fitted adjustable upper trailing arms and set the length to the same bolt centres as the fixed ones so should be right.

However running a different ride height what angle should I have with the wheels on the ground? Diff nose up, down or straight?

[orangeLJ]

Depends on the angle of the gearbox.

Essentially you want the angle of the diff yoke (if you were to draw a straight line from it) to be parallel to the line of the output shaft of your gearbox.

Ideally you would want a couple degrees of downward angle past parallel on the did to account for squat/weight/travel of the suspension too

[warrenm]

1 1/2° down from the crankshaft centre line.

[mika03au]

Should say the car is a road car, 1 1/2 sounds like a lot Warren.
Will get the car back on its wheels and see what angle I have and see how that looks.
Was initially thinking everything lined up level with just a tweak up or down for acceleration.
(looks like it should be nose down)

Thanks guys.

[ls2lxhatch]

The amount the pinion angle changes under load depends on many factors. As a starting point from this website.

 

Factory bushings: Set Pinion Angle 3 degrees to 4 degrees downward from cancelled angle.
Poly bushings: Set Pinion Angle 2 1/2 degrees to 3 degrees downward from cancelled angle.
Solid bushings: Set Pinion Angle 1 degrees to 1 ½ degrees downward from cancelled angle.

 

This article explains what you are trying to achieve and how to measure the angles.

[76lxhatch]

I'd reduce those starting points somewhat - they are talking about drag racing, and the Torana's suspension probably doesn't have as much movement as a bigger car. I'd be expecting it somewhere between 1.5 and 2 but you have to experiment a little as to what suits your setup.

Mine ended up at half a degree difference with poly bushings and a very short drive shaft (its actually two piece, only the rear part counts).

[mika03au]

The amount the pinion angle changes under load depends on many factors. As a starting point from this website. Factory bushings: Set Pinion Angle 3 degrees to 4 degrees downward from cancelled angle.Poly bushings: Set Pinion Angle 2 1/2 degrees to 3 degrees downward from cancelled angle.Solid bushings: Set Pinion Angle 1 degrees to 1 ½ degrees downward from cancelled angle. This article explains what you are trying to achieve and how to measure the angles.

Awesome, cheers.