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 )

> 915 transaxle question / info, a silly question...
CCSmith58
post Dec 3 2022, 12:20 AM
Post #1


Newbie
*

Group: Members
Posts: 8
Joined: 17-March 22
From: Southern California
Member No.: 26,404
Region Association: Southern California



Hello 914world… Just renewed my Membership !! Now looking to get my moneys worth...

I’m having a ’75 914 built into a 914-6.
Maybe 10 or 20 years ago I might have tried to do (some of) it myself.
Now I’m more a “pay the money, turn the key” guy.
Here’s a “silly” question. Likely the first of many….
How does a 915 Transaxle work when converted to a mid engine application ??
Not looking for a “how to” just an overview for personal info.
I’ve searched for articles, webpages and / or videos and don't find much.
I find acknowledgements of the conversion but no detailed or even general description.
I see the term “flipped ring and pinion”.
Does the whole gear system run backwards ??
Does just the differential run backwards ??
How would a LSD work in a converted 915 ??
Are the available 916 Kits good ??
Etc...
Any info or links to info would be appreciated !!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
 
Reply to this topicStart new topic
Replies
JWest
post Dec 10 2022, 01:12 PM
Post #2


Senior Member
***

Group: Members
Posts: 1,663
Joined: 6-January 03
From: Fort Worth, TX
Member No.: 97
Region Association: None



Shifter information: all 915 conversions that have ever been made use a 911/tail-shift style shifter with the ball cup and support bracket under the shifter.

Some 915 conversions are referred to as "side-shift" but the linkage is not designed to use the 914 side-shift type shifter. If you use the side-shift shifter with a 915, you will end up with the shift pattern flipped left-to-right.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rgalla9146
post Dec 10 2022, 01:43 PM
Post #3


Advanced Member
****

Group: Members
Posts: 4,788
Joined: 23-November 05
From: Paramus NJ
Member No.: 5,176
Region Association: None



QUOTE(JWest @ Dec 10 2022, 02:12 PM) *

Shifter information: all 915 conversions that have ever been made use a 911/tail-shift style shifter with the ball cup and support bracket under the shifter.

Some 915 conversions are referred to as "side-shift" but the linkage is not designed to use the 914 side-shift type shifter. If you use the side-shift shifter with a 915, you will end up with the shift pattern flipped left-to-right.


(IMG:style_emoticons/default/agree.gif) The only experience I have with a 916 is my own but I realized early on
that the reverse interlock on a 914 side shifter and the change of motion would
not work with a 915.
My trans is a '72. It's the only 915 that uses a stamped steel shift base that looks
just like a 914 rear shifter.......but it is very different down below.
The reverse lockout is on the opposite side and has two additional small springs.
I was lucky to find one.
I think the '73 and on 911 aluminum bases are the correct choice for any
915/916 install. OR, your choice of quality aftermarket 915 replacements.
Rory
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Steve
post Dec 10 2022, 03:03 PM
Post #4


914 Guru
*****

Group: Members
Posts: 5,899
Joined: 14-June 03
From: Laguna Niguel, CA
Member No.: 822
Region Association: Southern California



QUOTE(rgalla9146 @ Dec 10 2022, 11:43 AM) *

QUOTE(JWest @ Dec 10 2022, 02:12 PM) *

Shifter information: all 915 conversions that have ever been made use a 911/tail-shift style shifter with the ball cup and support bracket under the shifter.

Some 915 conversions are referred to as "side-shift" but the linkage is not designed to use the 914 side-shift type shifter. If you use the side-shift shifter with a 915, you will end up with the shift pattern flipped left-to-right.


(IMG:style_emoticons/default/agree.gif) The only experience I have with a 916 is my own but I realized early on
that the reverse interlock on a 914 side shifter and the change of motion would
not work with a 915.
My trans is a '72. It's the only 915 that uses a stamped steel shift base that looks
just like a 914 rear shifter.......but it is very different down below.
The reverse lockout is on the opposite side and has two additional small springs.
I was lucky to find one.
I think the '73 and on 911 aluminum bases are the correct choice for any
915/916 install. OR, your choice of quality aftermarket 915 replacements.
Rory

I tried them all desperately trying to figure out why it wouldn’t shift right before taking the car to Patrick Motorsports. The 916’s and other period correct GT’s with a 915 gearbox all have this one year 1972 shifter, since that is the year they came out. It looks like a 901 shifter with the reverse lockout on the other side. I still have one in my collection. I sold the Wevo and kept the 915 rennshift that JWest mentioned. The 915 rennshift is much more precise and with the stock short throw, I have zero issues with the 5th reverse lockout. The rennshift and Wevo is spring loaded to the 3rd and 4th gate, but the Rennshift also has a shorter left and right neutral. Literally when shifting from 2nd to 3rd all I do is push up on the Rennshift and it automatically goes into 3rd like butter. The stock 915 shifter and one off 1972 915 shifter is only spring loaded for reverse and 5th. The rest of the gears you have to fish for.
Notice goofy one off part numbers 18,19 and 20 5th reverse lockout. It does work and is period correct, but doesn’t shift like a modern Rennshift.
Attached Image
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post

Posts in this topic
CCSmith58   915 transaxle question / info   Dec 3 2022, 12:20 AM
Cairo94507   Welcome. Contact Patrick Motorsports in Phoenix, ...   Dec 3 2022, 07:28 AM
mepstein   Welcome. Contact Patrick Motorsports in Phoenix,...   Dec 3 2022, 07:34 AM
Steve   :agree: I’m running the setup in my 914. Works...   Dec 3 2022, 08:30 AM
stownsen914   If you'd like to do a 915 in a 914, you might ...   Dec 3 2022, 08:37 AM
Steve   PMS sells all the conversion parts and shift linka...   Dec 3 2022, 08:57 AM
Cairo94507   I just re-read the entire linked thread....really ...   Dec 3 2022, 09:53 AM
sixnotfour   Ring and Pinion Ratios are Motor specific.. early ...   Dec 3 2022, 10:58 AM
troth   PMB was just advertising a conversion package on F...   Dec 3 2022, 11:27 AM
brant   Short answer about the 915 In the 911 that it was...   Dec 3 2022, 12:45 PM
echocanyons   Eric and the PMB team just finished the 916 conver...   Dec 4 2022, 11:16 AM
Cairo94507   I am so very jealous. PM sent. :beer2:   Dec 4 2022, 11:36 AM
rgalla9146   Did the conversion myself except for R&P set u...   Dec 4 2022, 12:41 PM
stownsen914   The thing I don't love about 915 conversions f...   Dec 5 2022, 10:06 PM
Steve   :confused: No different than a 911….   Dec 5 2022, 11:40 PM
Dave_Darling   Some basics, here-- The "ring and pinion...   Dec 6 2022, 03:59 AM
mepstein   Martin Bott has the 916 conversion parts for sale....   Dec 6 2022, 06:34 AM
T.Rick6   CCSmith58 Question for ya, what size engine / HP ...   Dec 6 2022, 06:47 AM
Cairo94507   I would spend time researching Joe Cogbill before ...   Dec 6 2022, 08:23 AM
mepstein   I would spend time researching Joe Cogbill before...   Dec 6 2022, 09:10 AM
Steve   I would spend time researching Joe Cogbill befor...   Dec 6 2022, 09:31 AM
brant   To the OP You need to check also the gearing you w...   Dec 6 2022, 10:11 AM
slivel   The question of hp/torque limits on the 901 transm...   Dec 6 2022, 10:39 AM
brant   I also drained and replaced the gear oil every s...   Dec 6 2022, 10:51 AM
slivel   One other advantage of the 901 transmission is tha...   Dec 6 2022, 10:48 AM
Cairo94507   @slivel - Excellent feedback re your 901 experien...   Dec 6 2022, 11:00 AM
CCSmith58   GrEaT input here !! Thanks !! :...   Dec 7 2022, 08:01 PM
Steve   GrEaT input here !! Thanks !! ...   Dec 8 2022, 06:55 AM
Dave_Darling   So, How do you "flip" the ring gear ??...   Dec 11 2022, 04:49 PM
CCSmith58   So, How do you "flip" the ring gear ?...   Dec 14 2022, 12:51 PM
dr914@autoatlanta.com   expensive and not worth doing. We have done severa...   Dec 8 2022, 10:36 AM
slivel   Good point from Steve: "I switched to the lat...   Dec 8 2022, 11:33 AM
eric9144   I have a WEVO based 915 done by Patrick Motorsport...   Dec 8 2022, 11:45 AM
mepstein   I was just talking about this with 914Dave today. ...   Dec 8 2022, 05:17 PM
Steve   I was just talking about this with 914Dave today....   Dec 9 2022, 07:55 AM
mepstein   [quote name='mepstein' post='3043990' date='Dec 8...   Dec 9 2022, 08:32 AM
stownsen914   If you've ever messed with a custom shifter se...   Dec 10 2022, 11:01 AM
Eric_Shea   Kelly’s is amazing. With a spherical Firewall bu...   Dec 8 2022, 07:59 PM
JWest   Shifter information: all 915 conversions that have...   Dec 10 2022, 01:12 PM
mepstein   Shifter information: all 915 conversions that hav...   Dec 10 2022, 01:21 PM
rgalla9146   Shifter information: all 915 conversions that hav...   Dec 10 2022, 01:43 PM
Steve   Shifter information: all 915 conversions that ha...   Dec 10 2022, 03:03 PM
live free & drive   Here is a good thread from 914Dave about his ...   Dec 10 2022, 05:41 PM
Steve   Here is a good thread from 914Dave about his ...   Dec 10 2022, 06:55 PM
mepstein   Here is a good thread from 914Dave about his ...   Dec 10 2022, 07:38 PM
rgalla9146   [quote name='live free & drive' post='3044459...   Dec 10 2022, 08:16 PM
Steve   [quote name='live free & drive' post='3044459...   Dec 11 2022, 01:08 PM
6er   lots of info   Dec 12 2022, 05:50 PM
914dave   I cant believe its been ten years since i did the ...   Dec 13 2022, 01:00 PM


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

 



- Lo-Fi Version Time is now: 1st August 2025 - 05:54 PM