Wheel Spin

[ukkid35]

At Donnington yesterday I found I was much slower round some corners than other cars because as I increased the power through the corner the inside rear would lift and start spinning. The diff certainly appears to be LSD, I can't spin the rear wheels independently by hand, but presumably this doesn’t mean it’s not worn out. As it happens I have a spare diff that came with the car, but I would imagine that was an old one that was removed due to a problem. If I post photos can anyone identify what I have, and suggest where it could be tested and or rebuilt, and what it might cost.

Is it likely I also have a problem with the shocks? They are AVOs of indeterminate age and mileage.

[tejr]

Maybe its been "upgraded" to a hydratrak? Can't say I'm a fan of viscous diffs.. not sure how to check though..

[Gazzab]

If its a 4.5 then it would have come with a hydratrak diff.

[Gazzab]

Assuming your diff is Hydra and the avo's are ok (though tbh they are best replaced) then the other thing to look at is the ARB. You could unbolt it and tie it up out of the way...?

[browrz]

like this....
http://www.youtube.com/watch?v=38Or21q3nuc

Ive just had Andy (APM) swap out my 'fancy' hydra LSD for a cone-type from a Tuscan S. Havent been back on the hill climb yet but feel better (and is lower ratio to)

Seems the Hydratrak units really let you down when worn, when pressing on.

[itsallyellow]

A non working shock would not help maters, however if you pushing hard on track the hydratrak just dosnt cut it. One worked ok for us when it was perfectly new but replacing it with a good diff was one of the best things I have done!

[BCA]

What spec are you currently running at the rear??

Quaife ATB diff
Track biased tyres (R888s, we never made the jump, but the data doesnt lie!)
Removed/disconnected ARB
Higher spring rates all round to compensate the above slightly

/Weapon.

[spongy]

Can you purchase an adjustable ARB,as i did these on my last car and it made a big change to the old girl.I also bought some trick coilovers and to be honest this ruined the car in my opinion,was ok on track if weather was dry etc,but get some damp down or on normal driving and she was ste.I think a company called White line do some good bits,but not sure if they cater for us cerby boys.Also bud check all your bushes,the top ones can cause mega probs if they are shot,mine were gone when i got mine and now they are done she feels much better in the twisty bits

[Rawhide]

spongy said:

Can you purchase an adjustable ARB,as i did these on my last car and it made a big change to the old girl.I also bought some trick coilovers and to be honest this ruined the car in my opinion,was ok on track if weather was dry etc,but get some damp down or on normal driving and she was ste.I think a company called White line do some good bits,but not sure if they cater for us cerby boys.Also bud check all your bushes,the top ones can cause mega probs if they are shot,mine were gone when i got mine and now they are done she feels much better in the twisty bits

What coilovers ruined the handling?

[spongy]

Did'nt ruin it as such,but made the car into a track only motor in a way.you could play about with all the settings but who has the time etc to set this up for all conditions and tracks.In the real world you just need good shocks,good bushes and a geometry set up.My cerb has coilovers and these seem much better for normal driving,maybe i had my last ones set wrong or they had the wrong spring rates etc ii dont know?.I think as a rule (and i was guilty)people tend to set the cars up to low and to hard,yes it has its good points but it does have an effect on steering....power out of corners etc.Only my views but i did vow after my last build that this time i would take a new approach and it seems to be working so far

[ukkid35]

Found the likely cause when removing the steering rack, one of the front droplinks wasn't connected - Doh!

[TVTrev]

Don't put a quaife ATB type diff in if you want to solve your problem. they are torque biasing diffs, so if one wheel is off the ground no torque can be distributed to the other wheel. If you are tracking the car then you probably need a plate based LSD. Try Gripper (http://www.davemacprops.com/gripper.html) they make them to your own spec.