Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

2 Pages V  1 2 >  
 Reply to this topicStart new topic
> 915 Limited Slip in a 914/901 transaxle?
Eddie914
post Dec 6 2005, 07:16 PM
Post #1


Unregistered
I have found a 915 transaxle with Limited Slip.

Can the 915 Limited Slip differential be used in 914/901 Transaxle?

I believe I will have to use the six bolt output flanges.

Will 944 axles need to be used? Will they work with the redrilled 914/4 hubs currently on the ' 71 914/4 six cylinder conversion?

Thanks

Eddie
Go to the top of the page
+Quote Post
wertygrog
post Dec 6 2005, 07:32 PM
Post #2


wertygrog
**

Group: Members
Posts: 428
Joined: 12-November 05
From: Long Beach, CA
Member No.: 5,114
Region Association: Southern California
(IMG:http://www.914world.com/bbs2/html/emoticons/hijacked.gif)

I read somewhere that limited slip diffs was an option on 914's........am I mistaken?

Brent


carry on!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jim912928
post Dec 6 2005, 07:34 PM
Post #3


Senior Member
***

Group: Members
Posts: 1,485
Joined: 8-January 04
From: Granger, IN
Member No.: 1,536
Region Association: Upper MidWest
I say get a wevo and use the 915!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
TimT
post Dec 6 2005, 07:58 PM
Post #4


retired
****

Group: Members
Posts: 4,033
Joined: 18-February 03
From: Wantagh, NY
Member No.: 313
There is more than one flavor of 915 diff.. early diffs work with 901/914 boxes with no mods.. later ones require different flanges etc
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Eddie914
post Dec 6 2005, 08:20 PM
Post #5


Unregistered
This is a later version I believe ... 1986.

It might not be worth the effort.

What is it worth?

Thanks

Eddie
Go to the top of the page
+Quote Post
davep
post Dec 6 2005, 10:18 PM
Post #6


914 Historian
*****

Group: Benefactors
Posts: 5,151
Joined: 13-October 03
From: Burford, ON, N0E 1A0
Member No.: 1,244
Region Association: Canada
QUOTE (wertygrog @ Dec 6 2005, 05:32 PM)
(IMG:http://www.914world.com/bbs2/html/emoticons/hijacked.gif)

I read somewhere that limited slip diffs was an option on 914's........am I mistaken?

Brent


carry on!

Yes, there were available, but were pretty rare. Factory transmissions with LSD have HB serial numbers.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
wertygrog
post Dec 7 2005, 09:24 AM
Post #7


wertygrog
**

Group: Members
Posts: 428
Joined: 12-November 05
From: Long Beach, CA
Member No.: 5,114
Region Association: Southern California
where is the serial # on the tranny?

just curious.

thanks,
brent
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
propricer
post Dec 7 2005, 09:38 AM
Post #8


Member
**

Group: Members
Posts: 365
Joined: 16-April 04
From: Morgan Hill, CA
Member No.: 1,938
Model number is on the underside right at the stub out ... I believe (?) the serial number is next to it but not sure.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
brant
post Dec 7 2005, 10:05 AM
Post #9


914 Wizard
**********

Group: Members
Posts: 11,632
Joined: 30-December 02
From: Colorado
Member No.: 47
Region Association: Rocky Mountains
Eddie, is it a super cheap price?

because you may have to pay to have a stock Limited Slip rebuilt after you get it out...

by the time you pay for the rebuild, will it be any cheaper than buying a brand new one from guard?

plus the stock units only work on acceleration I believe
where as the guard units work on accell and decell

oh... installation costs are going to be the same on new versus used too.

brant
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
KenH
post Dec 7 2005, 10:42 AM
Post #10


Senior Member
***

Group: Members
Posts: 680
Joined: 16-January 03
From: Gilroy, CA
Member No.: 156
The 915 & 901 basic LSD are the same and will interchange. The only thing that has to match are the axle stub flanges. Early ones had a "course spline" 18 splines I think, and the later ones had a "fine spline" 43 ??.
Guard Transmissions can supply either flange so the LSD can be converted to the proper Spine.
915 LSD are ZF or clutch type and can be set for 40% or 80% slip and are always engaged.
Installation is not just bolt-and-go. Your Ring gear has to be fitted to the LSD and the "backlass" and "preload" of the differential have to be set.

Ken
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
KenH
post Dec 7 2005, 10:45 AM
Post #11


Senior Member
***

Group: Members
Posts: 680
Joined: 16-January 03
From: Gilroy, CA
Member No.: 156
Forget - no other modifications have to be made. With the proper Splines it will work with 914 axles.

Ken
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
propricer
post Dec 7 2005, 10:53 AM
Post #12


Member
**

Group: Members
Posts: 365
Joined: 16-April 04
From: Morgan Hill, CA
Member No.: 1,938
Ken ... clarification, please.

Are you saying that ANY 915 LSD will work in the 901 observing the spline issue as well as standard preload and backlash .. or just the early ones ???

Best ... Ed ( in Morgan Hill )
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bondo
post Dec 7 2005, 11:04 AM
Post #13


Practicing my perpendicular parking
****

Group: Members
Posts: 4,277
Joined: 19-April 03
From: Los Osos, CA
Member No.: 587
Region Association: Central California
If this comes up for sale I might be interested, as I am using 911 style 6 bolt CVs anyways. Beware though, I'm a CSOB. (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif) I have lots of 901 trans parts to trade though.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Aaron Cox
post Dec 7 2005, 11:07 AM
Post #14


Professional Lawn Dart
***************

Group: Retired Admin
Posts: 24,541
Joined: 1-February 03
From: OC
Member No.: 219
Region Association: Southern California
QUOTE (bondo @ Dec 7 2005, 10:04 AM)
If this comes up for sale I might be interested, as I am using 911 style 6 bolt CVs anyways. Beware though, I'm a CSOB. (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif) I have lots of 901 trans parts to trade though.

coarse or fine spline stub axles?

EDIT - ok...u planned on using adapters
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
KenH
post Dec 7 2005, 11:22 AM
Post #15


Senior Member
***

Group: Members
Posts: 680
Joined: 16-January 03
From: Gilroy, CA
Member No.: 156
The basic 901 - 915 ZF unit is the same, friction plates, spider gears, etc. The only differences are the output splines. I am not sure but I think the 930 ZF is the same also.

Ken
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
xitspd
post Dec 7 2005, 11:26 AM
Post #16


Technology and Tradition 3.6 and 914-6
***

Group: Members
Posts: 1,305
Joined: 17-November 04
From: Foothills of Mt. San Jacinto, CA
Member No.: 3,136
(IMG:http://www.914world.com/bbs2/html/emoticons/ohmy.gif) My mechanic put a 915 limited slip into a 901. I raced the car in the Ensenada Grand Prix. Call Steve Aven at Steve's in Orange. It was a little bit of work, but well worth the effort.


Attached image(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
brant
post Dec 7 2005, 12:26 PM
Post #17


914 Wizard
**********

Group: Members
Posts: 11,632
Joined: 30-December 02
From: Colorado
Member No.: 47
Region Association: Rocky Mountains
QUOTE (KenH @ Dec 7 2005, 09:42 AM)

915 LSD are ZF or clutch type and can be set for 40% or 80% slip and are always engaged.
Installation is not just bolt-and-go. Your Ring gear has to be fitted to the LSD and the "backlass" and "preload" of the differential have to be set.

Ken

am I correct though in understanding that ZF built units do not have the ramp feature where they provide a percent of lock up during off throttle braking/deceleration?

I know the guard unit does provide a chosen amount of lock up during off throttle.

and I know you can select what rates you want for accel and decel, such as 80% - 50%

but the factory units are not as tuneable.
-do they free wheel during decel?
-or do they just provide the same percentage during decel?

brant
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Eddie914
post Dec 7 2005, 12:48 PM
Post #18


Unregistered
Aaron,

What setup are you using to adapt the six bolt 911 type CV joints?

Can they be installed on 914/4 axles? (inner spline count the same?

It is rumorred that 944 axles are the correct length and bolt count ...

Thanks

Eddie
Go to the top of the page
+Quote Post
Aaron Cox
post Dec 7 2005, 12:50 PM
Post #19


Professional Lawn Dart
***************

Group: Retired Admin
Posts: 24,541
Joined: 1-February 03
From: OC
Member No.: 219
Region Association: Southern California
QUOTE (Eddie914 @ Dec 7 2005, 11:48 AM)
Aaron,

What setup are you using to adapt the six bolt 911 type CV joints?

Can they be installed on 914/4 axles? (inner spline count the same?

It is rumorred that 944 axles are the correct length and bolt count ...

Thanks

Eddie

944 setup. not 911 cv;s
(IMG:http://www.914world.com/bbs2/uploads/blog-1128554912.jpg)

944 early cv's fit right onto 914/4 shafts....
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
KenH
post Dec 7 2005, 03:49 PM
Post #20


Senior Member
***

Group: Members
Posts: 680
Joined: 16-January 03
From: Gilroy, CA
Member No.: 156
The ZF is a friction disk unit. The amout of slip is the same for accel or decel.

Gaurd makes both types of LSDs, Torque Bias & ZF type, which sometimes confuses the discussion.

Ken
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

2 Pages V  1 2 >
Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 2nd June 2024 - 03:43 PM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...