ATB or Plate style diff>

[gaf2]

Hi guys looking for advice, i dont know if i should go for a plate or ATB style diff. The car will be used for sprints and hill climb but also road legal. Would a Hockly 40% diff be too much for the road, have been in a rally car with a 70% diff and that is defo too much for tarmac. Are the Quaife ATB good units?

Cheers Grant.

[Stuart]

It's a very personal thing....

personally I hate the way an atb does its thing, others love it.
im a plate man lol

[Jonlem]

ATB is a great road diff but its not well suited to circuit work etc. its way better than a open diff but falls down by only being locked on power. I couldn't tell you the exact settings for the Grippers we use but they are not harsh at all, certainly not in comparison to one that a customer has in his gravel car and that is no fun to drive on tarmac , I believe his is 85% though, hard work !

[8valve-craig]

If it's mainly road, use an ATB. Mainly track, plate diff every time.

I ran the same car / F20 on 3 different diffs. Track performance on the gripper plate was immense in Tarmac spec, but you couldn't live with that on the road.

James above would have seen how that behaved at low speed, not for the mechanically sympathetic.

[RallyMarshal]

Most of the plate diffs can be configured for a "lightweight" setting - either different plates and preload for actual traction or different ramp angles for that point when it locks (power or braking)

Personally, I like mine nice and tight (oo err misses) so that if I break a shaft, it will pull me out of the stage on one shaft.

I run a TranX in the tarmac 2000cc car usually and a ZF in the 1400cc car but both will be on TranX later this year.

I have heard (but not used) good things about the 3J diffs and the way they work.

Paul..

[novarally]

Most of the plate diffs can be configured for a "lightweight" setting - either different plates and preload for actual traction or different ramp angles for that point when it locks (power or braking)

Personally, I like mine nice and tight (oo err misses) so that if I break a shaft, it will pull me out of the stage on one shaft.

I run a TranX in the tarmac 2000cc car usually and a ZF in the 1400cc car but both will be on TranX later this year.

I have heard (but not used) good things about the 3J diffs and the way they work.

Paul..

I've recently bought a 3J plate diff, it's not installed yet but I'm looking forward to trying it out.

[Benn]

What style are Quaifes?

[Jonlem]

Torque biasing, not plated

[gaf2]

Thanks for all input guys, some more thinking for me to do.

[Royston]

I have a ZF tarmac spec plate diff in my sport, drives fine on the road, locks when it needs too, worked fine on the drag strip

[gaf2]

I am looking at these new 3J next generation plate diffs and the different ramp angles etc that are available but i have no idea what it all means. What would equate to a middle setting tarmac diff.

40/90 65/75lbs ft
40/90 25/35lbs ft
30/90 65/75lbs ft
30/90 25/35lbs ft
50/90 65/75lbs ft
50/90 25/35lbs ft
45/45 65/75lbs ft
45/45 25/35lbs ft

Hope someone can educate me am keen to learn haha. Cheers.

[novarally]

I don't profess to be an expert, but I can tell you what 3J recommended and supplied for my use (hillclimbs and sprints), which was a a 40/90 ramp angle with a medium pre-load.

Don't know if that helps.

[gaf2]

Cheers Colin.