nile13

How many of you guys and gals have cars without LSD/ABD (that would be option 220 and option 224)? Do you feel any need for limited slip on the street? I know they generally don't last all that long, but if anyone has had experience with and without LSD in a 993, would you care to comment?

timothymoffat

Neither one of my 993s has the LSD/ABD option. I've also driven, rather extensively, a C2S that is equipped with those options. For the street I'd have to say I prefer the car without LSD. The only time I really noticed the LSD was in low-speed corners where it generated more understeer. And since these cars have lots of traction to begin with because of the rear-weight-bias, I've never felt that LSD would be of any great advantage on the street.

I'll leave the track comentary to those with more track experience.

Mark in Baltimore

My car did not come with LSD. I added a Guards unit (thanks Jean!) and find it to be helpful in certain tight corners at the track but wonder how truly effective it is on the street since I never found myself yearning for it when I was on the road.

nile13

Tim, Mark, thanks!

As my 993 was a 4-season car, I think I liked having LSD in the winter on the street. I also think it'll be pretty big for autocross (I've put LSD in my autocross appliance since it was damn nearly impossible to drive fast otherwise), but it has 50-50 weight distribution and narrow tires. I'm curious what 993 with open diff would be like in that respect. Mark's comment on tight slow corners is as close to Auto-X situation as it gets, essentially.

BTW, while we are at it. How do you drive a 993 outside of street? I've found that pretty much any older 911 has to be drive more by right foot than by steering wheel. the rack is too long and teh car just doesn't respond unless you point the front with steering wheel roughly to where you are going and set the rear with your right foot.

nile13

Mark, how much did installing Guard cost, anyway? Is Quaife more or less expensive?

Mark in Baltimore

Mike, believe it or not, my Porsche mechanic charged $380 according to my records.

nile13

Mark, that's really inexpensive. Do you recall the price of the Guards unit itself?

Steve Weiner-Rennsport Systems

Mike,

Quaife's, or any Torque-Sensing differentials are cheaper, but do not offer the main benefits of an LSD, namely the ability to stabilize the car under braking by keeping the rear wheels locked together.

TQ-Sensing diffs simply freewheel under braking, just like open differentials and allow the rear end of the car to move laterally, something you can feel. Its rather disconcerting,.....

For general street use, either one will control wheelspin, but for DE days, the LSD is a much better proposition.

Mark in Baltimore

Mike, it was $2,000 and brand-new. I think it sold for $2,500 new, maybe more.

nile13

Mark, Steve, thanks!