Fast Ford - - Accelerate Faster -

A car with an open diff is al­most al­ways pretty crap to get off the line; all the power sim­ply spins away through one wheel. Thank­fully, a lot of fast Fords al­ready come with an LSD fit­ted as stan­dard, but in­cred­i­bly cars like the Mk7 Fi­esta ST, Mk2 and Mk3 Fo­cus ST, and even the Mk3 Fo­cus RS all come with an open diff from the fac­tory. And even cars that did come with LSDs, like the S1/S2 RS Turbo and Cosworth range, can all be im­proved with the lat­est ver­sions of lim­ited-slip dif­fer­en­tials.

The older 80s-style vis­cous-fluid diffs can be re-built, but for ul­ti­mate grip off the line ei­ther a plated-type or au­to­matic torque bi­as­ing dif­fer­en­tial is prob­a­bly bet­ter. A lim­ited slip diff im­proves trac­tion by do­ing ex­actly what it says; it lim­its the slip across the dif­fer­en­tial. Or, in other words, it forces the avail­able power to both wheels, which in-turn means im­proved ac­cel­er­a­tion. And, even if the wheels are spin­ning, both will have power (or tech­ni­cally, torque) be­ing sent to them which gives more for­ward mo­men­tum than an open diff, which would sim­ply spin all the power away at the wheel with least re­sis­tance.

There are dif­fer­ent types of dif­fer­en­tial avail­able, and it de­pends on what driv­ing char­ac­ter­is­tics you pre­fer, but as a gen­eral rule FWD cars tend to favour ATBs while reardrive ap­pli­ca­tions are well suited to a plated-type diff.

ATBs are the LSD of choice for mod­ern FWD Fords

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