Alfa-less and lost.
AO Silver Member
Join Date: Jan 2003
Location: United Kingdom
Re: Alfaholics Q2 diff vs Autodelta diff?
No, the Q2 needs only a pair of diff bearings. The differential is the component that takes the final drive from the gearbox to the wheels so nothing to do with the number of valves on an engine. A locked-differential would make turning v difficult - the two front wheels have to travel different distances to go round the corner as the inner wheel travels on a shorter radius of curve. A normal diff is an open-diff - the wheels can rotate at different rates, the power going to the easiest one to turn. A limited-slip diff feeds power predominantly to the easiest one to turn, but when one wheel it turning much more than the other (usually as it is slipping due to lack of grip) the more free wheel is only allowed to turn a proportion more than the wheel with the most grip, so you get much more drive. The two types of LSD are a clutch-based one such as the Autodelta, or a torque-biasing one such as the Q2. The Autodelta one is arguably the better esp for track-work, but the Q2 has certain advantes of cheaper production and zero-maintenance. (The rear wheels are a free-diff as they are free to rotate completly independently of each other and free of drive.)
I have the Q2 and find is much better than the original open-diff and perfectly good enough for road-use.
Hope this helps.