Im going to build my own chain diff but was wondering which car diff im best off using? The engine is a xjr1300 with 125-130bhp and about 90lb-ft torque (when finished) and the finished car will weigh about 350kg.

Im after a compromise between acceleration and top end.

pretty much any diff from a car in the last 15 years will work then since your ratio will be done by the sprockets you use rather than the diff its self

Sierra 4 X 4 lsd?
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come to think of it abit more how about a torque biasing diff taken from the rear axle of a an audi a8 quattro or maybe a new one from quaife

Sylva sell a kit to convert a Fiesta diff....

Have a chat with Martin Keenan at mk enginnering,he supplies a unit that he users in the sprint R single seater.