How many 915's with a LSD?

Goth · 06:32 AM

Just wondering What percentage of 915's have a limited slip differential. Was this very common?

If you have more than one 915 tranny, you can choose more than one answer.

Thanks for Voting!

Goth · 12-02-2006, 06:45 AM

Not sure how accurate this is... So far 100+ viewers and only 14 voters.

Anyone have an educated guess as to the percentage of LSD's out their?

I'm thinking mechanics, club members, long time owners, etc. must have some idea.

dan79brooklyn · 12-02-2006, 08:27 AM

How best to determine if one has an LSD?

Wil Ferch · 12-02-2006, 09:19 AM

I have one ...factory (dash 12)... in my 85 Carrera.

- Wil

Bill Verburg · Bill Verburg's Garage

I don't know but a WAG based on what i've seen over the years would be < 20%, when I was considering what to do w/ my C3, lsd equipped trans were rarely available.

MBEngineering · 12-02-2006, 11:00 AM

HI would you like me to look through my gearbox build book and list all the 915 box's I have repair logged with and without, also which LSD was fitted??

regards mike

crashmy911 · 12-02-2006, 11:53 AM

Why would you need it unless you were pushing some serious power thru the rear wheels. If you have a stock engine I would think you wouldn't need this done. I would like to hear if it makes a huge difference at the track. i don't think it would be needed for a street car.

DaveE · 12-02-2006, 12:00 PM

Quote:

Originally posted by crashmy911
.......I would like to hear if it makes a huge difference at the track. i don't think it would be needed for a street car.

Not a Porsche, but my lap times in my BMW improved by a few seconds when I went from open to locked (welded) diff.

WPOZZZ · 12-02-2006, 12:28 PM

lsd w/ tranny cooler on my 85.

911 in SC · 12-02-2006, 01:40 PM

Quote:

Originally posted by WPOZZZ
lsd w/ tranny cooler on my 85.

Same here...in my '84.

analogmike · analogmike's Garage

Added an OEM one to my 2.7RS clone. Big improments in autocross times, decent improvement on the track too.

Goth · 12-02-2006, 03:15 PM

Quote:

Originally posted by 911 in SC
Same here...in my '84.

So how do ya get the tranny cooler? Was it an option for US spec cars, or, just something for the ROW cars?

BTW: Thanks to all that posted/voted!

Goth · 12-02-2006, 03:26 PM

Quote:

Originally posted by dan79brooklyn
How best to determine if one has an LSD?

Not sure if your question really was answered. Try this thread or you can do a search for "LSD".

Option code for LSD in a 915?

Hope this helps

Bill Verburg · Bill Verburg's Garage

Quote:

Originally posted by Goth
So how do ya get the tranny cooler? Was it an option for US spec cars, or, just something for the ROW cars?

BTW: Thanks to all that posted/voted!

there were 2 style of 915 coolers early and late

the early style had a pump in the front cover used on the early RSR and comp versions of the RS

the other is the late style used on 'my '84-86 915/67/69/72 RoW trans, though Bruce Andersion once told me some Texas cars also got them, never seen one myself. 915/67 is in my C3
late style pump is in the side cover

Goth · 12-02-2006, 03:32 PM

Wow Bill!

You always come through with great info & these really great pics.

Thanks!

Goth · 04:09 PM

Quote:

Originally posted by MBEngineering
HI would you like me to look through my gearbox build book and list all the 915 box's I have repair logged with and without, also which LSD was fitted??

regards mike

Hey Mike,

I didn't want to impose, but it would be really great if you could post some data.

EDIT: The poll is fun, but I have a feelin' it's not very well done (on my part). I think those with LSDs may vote more readily than those without.

Thanks!