R26 Limited slip differential: GKN Driveline, Quaife, RSX or .....

Gripper plate diff with the correct oil, stickier tyres may also help

 

I'm gonna be going gripper, mabey even get it ordered soon!
plated is suited better for pure track use

 

Your problem is with the type of differential. Putting ATBs on FWD cars is a great idea to help the car turn as they put the torque to the wheel with the most load on it which is the outside wheel in the early part of a corner. However this type of differential has a flaw in that when the inside wheel becomes unloaded they can end up spinning away all the power through that wheel just as an open differential does. Wavetrac claim to get over this problem but it seems pretty much all serious racers use some form of traditional LSD with the friction disks, its also why all RWD racers I know of also use a traditional LSD because in cars like my own 944 S2 racer its the inside wheel lifting and spinning away the power in slow corners that is the problem to solve.

Downside however is understeer, I had a special rebuilt ZF unit in that car at one time that had crazy levels of preload. It was a stupid idea as the car just didn't want to turn, couldn't get round the end of the pit lane at Brands Hatch for example without scrabbling the front wheels. It was also very very snappy on the limit, but incredible traction up to that point. The car probably would have been OK though if we altered the suspension geometry and spring rates to suit but this is not simple, it took me 2 to 3 years to get the cars setup as it is now. Braking stability was also incredible but my big learning experience from all that was that an effective LSD will require extensive changes to the rest of the cars set up which in turn can take a considerable amount of time and money to get right. That car currently doesn't have an LSD so it spins up the inside wheel at maybe one corner on most UK circuits but it has amazing handling everywhere else, 1.5g at 55 mph for example. Think long and hard about doing it as these are not simple bolt on type modifications to do.

 

Hi Dodotti
I fitted the Quaiffe ATB to my 225, seams to work well, i had nothing to compare it too as i never used the car on a track before the diff was fitted.
I have done a few track days with it fitted and i have not noticed the traction control light flashing powering out of corners so i presume its working well

Ian

 

You cant turn the traction control off on the 225, resets at 30 mph.
I am running BC coil overs set up 8/8kg fronts and rear