Quaife ATB differential

The ATB blurb from an MG web page.

mgaguru.com/mgtech/rearaxle/ra302c.htm

Jezz wrote: The ATB blurb from an MG web page.

mgaguru.com/mgtech/rearaxle/ra302c.htm

Great link, thanks. This is the concept I was trying to explain less eloquently in my previous post:

"These can be designed with torque bias of 3:1 or up to 5:1. So if one wheel begins to lose traction the other wheel can receive up to 5 times as much torque as the one that is slipping. It also has the advantage of being able to transmit nearly all of the propshaft input torque to the wheels, proportioning torque appropriately up to the point where both wheels might spin at the same time.

Unfortunately five times zero is still zero, so when one wheel hits a patch of wet ice it will still spin, and the other wheel will be limited to five times the torque as the one on ice. This works well as long as the low torque wheel still has some grip and some available torque, but if you lift a wheel in a fast turn it will immediately revert to zero torque all around like an open differential."

So useful where there's partial grip but no help if you get stuck with one wheel in the air, where a full locking diff would be needed.

Except that off road with a wheel in the air you have the opportunity to apply a little bit of hand brake or left foot brake to give resistance to the spinning wheel and essentially trick the atb into sending drive where you have grip. It takes a degree of skill and understanding to master but in essence its the same operation as terrain response in a modern semi locking land rover but without the computers.

Old thread but great read.

So the Jimny can now have the same type of diff as the Military Humvee, at least in one axle.

Any one know what the torque Bias is in the Jimny specific Quaife ATB differential? 3:1 and 5:1 are quoted. Hopefully it's a 5:1.

A friend in the US military, said that standard Humvee training practice was to apply the brake slightly in situations where forward progress was interrupted by loss of traction. The multiplication of the breaking torque to wheels with some traction remaining was not explained to recruits. Just apply plenty of throttle and enough brake to get in motion. this does strain the transmission somewhat.

I think the Quaife with a dual hand brake mod would be an awesome combination for those who spend 90% on road but want to go hard off road. On the occasions that the dangling wheel is the issue brake it and 100% of rear axle torque is now available at the load bearing wheel. With a bit of practice it wouldn't be much less involved than locking and unlocking the 'Gold standard' ARB.

Cheers,

Grogey

Hi Folks,

Old thread but I had some quick questions around this.

I own a Maruti Gypsy which is the current in-production version of the Suzuki Samurai LWB413 manufactured in India.
While you folks are Jimny owners - do you know if the 2018 Jimny use exactly the same axle/gears as the Samurai and whether I can fit this QDF3P Quaife Suzuki Jimny ATB differential unit into my Gypsy? Or do the Jimny's use a different gear/axle ratio than the Samurais? I think mine is 26 spline 6.9" gear at the rear and 22 spline at the front.

I dont off-road, just want to prep my car for remote mountain trips somewhere down the line with bad to non-existent roads without getting stuck easily.

Thanks for your inputs around this.

Welcome to the forum. Unfortunately I don't know enough about the Maruti production ones to be able to say definitely yes or no. I know there was some commonality between samurai sj and Jimny but I don't know how that translated for the gypsy models. Our illustrious leader Martin might know more as he has parts lists available?