Super Lock LSD on Porsche 911 3.2

[Juan Saca]

hello, I own a 1989 911 3.2. I would want to know what effects the limited slip differential (lsd) has in the performance of the car.

Thanks, Juan

[Oh Haha]

It allows both rear axles to turn at the same time, giving you better traction in a straight line.

When cornering, it allow the axles to turn at slightly different speeds. This prevents the tires from chattering.

[HawgRyder]

Be advised...there are several types of LSD units.
Some are geared (muliple sets of gears inside the crown carrier that allow both wheels to be driven...but at different speeds).
Others use clutches that slip to do the same different speed idea.
Detroit Lockers...they lock the axels like a spool (no difference in speed) to both axles.
Probably a few more.
Bob

[Steve@Rennsport]

Originally Posted by Juan Saca

hello, I own a 1989 911 3.2. I would want to know what effects the limited slip differential (lsd) has in the performance of the car.

Thanks, Juan

Juan,

Two types here that work totally differently:

1) LSD's that use multiple clutch plates. LSD's distribute power in varying degrees (based on design & setup) during acceleration to each wheel and keep the rear wheels locked together under braking to really stabilize the car.

2) Torque-sensing units that use helical gears. TQD's distribute power to each wheel while allowing different wheel speeds, however these "open' under braking and function like an open diff. This allows the rear end to wiggle around, just like an open differential.


IMHO, LSD's really help a 911 by stabilizing the car under hard braking and corner entry, something that the TQD's cannot do. TQD's are a good choice for Autocrossers and for normal street use.

[HawgRyder]

Steve...do you remember the old Ford "Dual Drive" that was used on the Falcons?
Would that be classified as a TQD?
I think they were only available on the lower HP engines...they were not strong enough for the 289 HP ones.
Bob