?? Regarding testing a Quaiife ATB DIFFERENTIAL

[Matt Monson]

Fun project. I think a Chevy swap in a 944 is a great combo. I call it a 948. The car that Porsche should have built but didn't.

[dap930]

I checked the Quaife on my '77 turbo. With both tires off the ground, the tires turn the same direction. If I stop one side, I can get the free side to turn but it takes 50 ft-lbs of torque to do it. Is this right? The Quaife has been installed since the early 90's.

[dap930]

Bump

Matt, Walt, Geary,

Any thoughts on my Quaife test results? Both wheels turn the same direction. If I lock one wheel, it takes about 50 ft-lbs to turn the free wheel.

[Flieger]

I don't have much experience, but I know you can turn a helical torsen easily by hand when it is not installed. There are some diffs that combine friction plates and torsen gearing but I think the Quiafe is a pure gear type.

[dap930]

I e-mailed Quaife USA to ask the question about testing a Quaife to verify it is installed.

They provided the following steps to check for a Quaife installation:

1. Lift the drive wheels off the ground
2. With the engine off, put the car in any gear.
3. Rotate the Drivers wheel clockwise. The passenger wheel should rotate counter clockwise.
4. Block or lower the passenger wheel so it cannot turn.
5. Try to rotate the Drivers wheel. It should not turn but about 1 inch in either direction.

If it does not pass these tests, then it is either not a Quaife or a damaged unit.


I did the checks as prescribed and my Quaife met the criteria. However, step #3 required the use of a lever arm to turn the hub. That may be too much frictional torque. They said to do step #3, you should be to rotate the tire by hand. I am waiting for a response from them on this.

[Cloggie]

Originally Posted by dap930

I e-mailed Quaife USA to ask the question about testing a Quaife to verify it is installed.

They provided the following steps to check for a Quaife installation:

1. Lift the drive wheels off the ground
2. With the engine off, put the car in any gear.
3. Rotate the Drivers wheel clockwise. The passenger wheel should rotate counter clockwise.
4. Block or lower the passenger wheel so it cannot turn.
5. Try to rotate the Drivers wheel. It should not turn but about 1 inch in either direction.

If it does not pass these tests, then it is either not a Quaife or a damaged unit.


I did the checks as prescribed and my Quaife met the criteria. However, step #3 required the use of a lever arm to turn the hub. That may be too much frictional torque. They said to do step #3, you should be to rotate the tire by hand. I am waiting for a response from them on this.

Hi there, this is a very old thread, but I found it searching for diagnosis for my G50 that is equipped with Quaife.

Issue for me is that with both wheels in the air and with the transmission in neutral, I can barely turn the tires, it takes major force to make it turn...not smooth at all, so much so that I can't even do it and see what the other side is doing at the same time.

The transmission was fully rebuilt about 8 years ago and then stored (oil in) in a dry location and has never been put into service. I actually do not recall when I got it back even trying to spin the output shafts....so have no comparison.

Anyway, it seemed like you were having some similar issues and wondering what Quaife told you about the force necessary to turn.

Thanks in advance for any further insight you can provide.

D.

[PeteKz]

Parking brake or disc brake dragging?

[Cloggie]

Originally Posted by PeteKz

Parking brake or disc brake dragging?

I am going to take the half shafts off and confirm there is no dragging enywhere on either hub....

Pretty sure they are loose, but need to confirm as per your suggestion.

D.

[Cloggie]

Ok, an update and my blood pressure is down.

The car has fairly stock 1989 Carrera suspension but I do have the Elephant ASP system installed along with Fuchsfelge wheels and the spacers recommended by Fuchsfelge for this car which was 32 mm spacer for the front and 21 mm for the back.

I dutifully followed this recommendation although I challenged the front/rear spacers as I thought it was the other way around with the larger spacer in the back.

Well, I was right.

With their spacer combination, the rear tire rubs against the trailing arm/ASP to the point where you can barely turn the wheel/tire.

So after some careful measurement, I figured I needed a rear spacer of - you guessed it - 32 mm in the rear and after checking the front, they turned out to be spaced out too far and needed a spacer of around 20mm.

So, reversed the two, everything fits properly now and I am ever so thankful that the Fuchsfelge wheels have deep pockets where my now too long rear studs fit without problems.

I am buying new studs for the front, fairly easy to do, just have to take the front hubs off and swap them, no rear bearing problem to handle.

So that was it, transmission spins fine with the tires not rubbing the suspension.

Not a Quaife problem at all...

D.