 Adding a 915 trans to a 6 conversion, There must be a better way |
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| mepstein |
 Nov 5 2016, 07:46 AM
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#1
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914-6 GT in waiting  Group: Members Posts: 19,596 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region 
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Is there any reason I shouldn't consider working up a cable shifter instead of the traditional 916 shift linkage. The current 916 kit is $3-3250. Add in labor for machining and assembly and you're at $5k just to make the trans shift correctly. The suby guys are doing the shifting with $300 worth of cables and hardware. Am I missing something here?
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Replies(1 - 19)
| GeorgeRud |
Nov 5 2016, 08:07 AM
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#2
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Advanced Member Group: Members Posts: 3,725 Joined: 27-July 05 From: Chicagoland Member No.: 4,482 Region Association: Upper MidWest |
Even if you run a cable shifter setup, you still will need to flip the ring and pinion and machine for clearance, so there is some cost involved. My 915 has a Vellios kit that was carefully installed and massaged to shift well, but I was able to buy it for a little over a grand so it was a good deal.
With the exception of having to make provisions for a different muffler ( the banana muffler won't fit with the shifter taking that piece of real estate), I don't see where it couldn't be done. I seem to even remember seeing some photos of a 915 behind a V8 conversion, so give it a try! Please post photos and enjoy your project in good health! |
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| mepstein |
Nov 5 2016, 08:18 AM
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#3
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914-6 GT in waiting Group: Members Posts: 19,596 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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Yes, flipping the ring and pinion is a given. That will be done when I rebuild the trans. But it came out of a running car so I'm not expecting many surprises. Good point about a muffler but I can build that around the shifter. If I can save $5k on the trans mods (and still have a great setup) that's pretty significant.
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| ConeDodger |
Nov 5 2016, 08:21 AM
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#4
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Apex killer! Group: Members Posts: 23,825 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California
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McMark at Original Customs has a cable shift solution in prototype development. Dial him up and see if it's ready for install. (IMG:style_emoticons/default/evilgrin.gif)
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| 914forme |
Nov 5 2016, 09:14 AM
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#5
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Times a wastin', get wrenchin'! Group: Members Posts: 3,896 Joined: 24-July 04 From: Dayton, Ohio Member No.: 2,388 Region Association: None
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QUOTE(mepstein @ Nov 5 2016, 09:46 AM)  Is there any reason I shouldn't consider working up a cable shifter instead of the traditional 916 shift linkage. The current 916 kit is $3-3250. Add in labor for machining and assembly and you're at $5k just to make the trans shift correctly. The suby guys are doing the shifting with $300 worth of cables and hardware. Am I missing something here? 915 Cable Shifter Enjoy And this carries the PMS Name (IMG:style_emoticons/default/confused24.gif) "Patrick Motorsports Exclusive 911 / 915 Cable Shifter System - (1972-1986) PORSCHE 911 / 915 5-Speed Transmission - Complete shift system ideal for mid engine, racing and off road vehicles - Features high quality adjustable bearings and hardware - Pre assembled and set up with shift tower, shifter knob and ridged fabricated steel rear bracket - Black powdercoated housing & bracket with chrome handle shift lever - PATRICK MS USA + NOTE: Special Order Production and chassis specific application - Cable measurements lengths from center of shifter handle position to the dimple in the transmission shift rod must be provided. + Please also share the vehicle application details. + Please allow 1-4 weeks for cable production and setup assembly." The one issue I see is the length of the shift rod. Does it really need all that travel or was them meant to get it into the 911 body properly so Hans could get a bolt in? If the latter is the case, figure out the travel and machine the rear shift rod to shorten it a bit. A bell crank setup would also allow you to gain some real estate out back to make the rear muffler a bit easier to get in. I see no reason why the answer is not yes. The 916 kits where invented back when things where still rather mechanical. You could also do this with servos, and actuators, or air or hydraulics. Have fun, that matters could also make you have a semi automatic, but that would take more than 5K to figure out all the programming. Thought the drag guys do this all the time, just not sure you want that setup, as it is intended for one function, and then forget the rest. Motorcycles have also gotten into the game, slightly easier to do on a bike. |
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| SirAndy |
Nov 5 2016, 10:42 AM
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#6
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Resident German Group: Admin Posts: 41,894 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(ConeDodger @ Nov 5 2016, 07:21 AM) McMark at Original Customs has a cable shift solution in prototype development. Dial him up and see if it's ready for install. (IMG:style_emoticons/default/evilgrin.gif) (IMG:style_emoticons/default/agree.gif) My 915 is patiently waiting for the OC cable shifter ... (IMG:style_emoticons/default/bye1.gif) |
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| mepstein |
Nov 5 2016, 11:08 AM
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#7
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914-6 GT in waiting Group: Members Posts: 19,596 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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QUOTE(SirAndy @ Nov 5 2016, 12:42 PM) QUOTE(ConeDodger @ Nov 5 2016, 07:21 AM) McMark at Original Customs has a cable shift solution in prototype development. Dial him up and see if it's ready for install. (IMG:style_emoticons/default/evilgrin.gif) (IMG:style_emoticons/default/agree.gif) My 915 is patiently waiting for the OC cable shifter ... (IMG:style_emoticons/default/bye1.gif) Any idea how long? Looks like PMS are just cable shifts with there name on it for more money. |
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| SirAndy |
Nov 5 2016, 11:48 AM
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#8
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Resident German Group: Admin Posts: 41,894 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(mepstein @ Nov 5 2016, 10:08 AM) QUOTE(SirAndy @ Nov 5 2016, 12:42 PM) Any idea how long? No, but McMark would know ... (IMG:style_emoticons/default/shades.gif) |
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| mepstein |
Nov 5 2016, 12:26 PM
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#9
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914-6 GT in waiting Group: Members Posts: 19,596 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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I'm very encouraged to see an existing solution and hear of another in the works. I definitely will be moving forward with the 915 trans for the 2nd conversion car.
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| rgalla9146 |
Nov 5 2016, 06:42 PM
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#10
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Advanced Member Group: Members Posts: 4,652 Joined: 23-November 05 From: Paramus NJ Member No.: 5,176 Region Association: None
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QUOTE(mepstein @ Nov 5 2016, 09:46 AM) Is there any reason I shouldn't consider working up a cable shifter instead of the traditional 916 shift linkage. The current 916 kit is $3-3250. Add in labor for machining and assembly and you're at $5k just to make the trans shift correctly. The suby guys are doing the shifting with $300 worth of cables and hardware. Am I missing something here? I wonder if Martin Bott would sell his side shift parts separate from his complete 916 conversion kit ? The trans can be supported with a fabricated rear mount (which someone already makes)and the 915 rear cover and selector shaft can be trimmed to clear the muffler.(or not ?) If so, the only fabrication is the shift rod which is pretty straight forward and getting it to coordinate with a 915 shifter. Oh yeah, clutch cable too. PS I have the whole setup from Mr. Bott and already did the trans conversion but haven't gotten far enough with the car to actually drive it. There are certainly other ways to skin a cat. How about a Boxster trans ? |
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| 914forme |
Nov 5 2016, 07:40 PM
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#11
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Times a wastin', get wrenchin'! Group: Members Posts: 3,896 Joined: 24-July 04 From: Dayton, Ohio Member No.: 2,388 Region Association: None
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(IMG:style_emoticons/default/agree.gif) Boxster fits the space even better, and well you can get the VW version dirt cheap.
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| ConeDodger |
Nov 5 2016, 07:58 PM
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#12
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Apex killer! Group: Members Posts: 23,825 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California
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QUOTE(SirAndy @ Nov 5 2016, 01:48 PM) QUOTE(mepstein @ Nov 5 2016, 10:08 AM) QUOTE(SirAndy @ Nov 5 2016, 12:42 PM) Any idea how long? No, but McMark would know ... (IMG:style_emoticons/default/shades.gif) Weekends belong to Alison so try contacting him Monday. LOL! I butt-dialed him today while sight seeing at Harvard University. He didn't answer. (IMG:style_emoticons/default/biggrin.gif) |
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| mepstein |
Nov 5 2016, 08:07 PM
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#13
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914-6 GT in waiting Group: Members Posts: 19,596 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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QUOTE(ConeDodger @ Nov 5 2016, 09:58 PM) QUOTE(SirAndy @ Nov 5 2016, 01:48 PM) QUOTE(mepstein @ Nov 5 2016, 10:08 AM) QUOTE(SirAndy @ Nov 5 2016, 12:42 PM) Any idea how long? No, but McMark would know ... (IMG:style_emoticons/default/shades.gif) Weekends belong to Alison so try contacting him Monday. LOL! I butt-dialed him today while sight seeing at Harvard University. He didn't answer. (IMG:style_emoticons/default/biggrin.gif) One of the most popular tourist destinations in the world. |
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| ConeDodger |
Nov 5 2016, 08:57 PM
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#14
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Apex killer! Group: Members Posts: 23,825 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California
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QUOTE(mepstein @ Nov 5 2016, 10:07 PM) QUOTE(ConeDodger @ Nov 5 2016, 09:58 PM) QUOTE(SirAndy @ Nov 5 2016, 01:48 PM) QUOTE(mepstein @ Nov 5 2016, 10:08 AM) QUOTE(SirAndy @ Nov 5 2016, 12:42 PM) Any idea how long? No, but McMark would know ... (IMG:style_emoticons/default/shades.gif) Weekends belong to Alison so try contacting him Monday. LOL! I butt-dialed him today while sight seeing at Harvard University. He didn't answer. (IMG:style_emoticons/default/biggrin.gif) One of the most popular tourist destinations in the world. Yes, my wife who is a member here, (Yopu) is a financial planner with her own agency. One of the companies she represents sends her on trips all the time because she is their consistent top agent. The last three days we've been in Boston. Tomorrow we go home, so we decided to hit the town. MIT, Fenway Park, Harvard, and downtown Boston. Back in our room now but amazing trip! What's wild is she's already won a trip to Disney World in the Spring! Everything in the park is free! She's working on Hawaii trip for Winter 2017... love Boston though! |
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| eitnurg |
Nov 6 2016, 02:18 AM
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#15
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Country Member Group: Members Posts: 150 Joined: 31-December 02 From: Nairobi Member No.: 62 Region Association: None |
QUOTE There are certainly other ways to skin a cat. How about a Boxster trans ? I thought the problem was that the Boxster trans has no provision for a starter motor? Or am I missing something here? (They're certainly cheap, though.......) |
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| ClayPerrine |
Nov 6 2016, 05:11 AM
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#16
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Life's been good to me so far..... Group: Admin Posts: 15,903 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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QUOTE(eitnurg @ Nov 6 2016, 02:18 AM) QUOTE There are certainly other ways to skin a cat. How about a Boxster trans ? I thought the problem was that the Boxster trans has no provision for a starter motor? Or am I missing something here? (They're certainly cheap, though.......) I am building the adapter plate to put a G86-21 Boxster six speed behind my 964 motor. I will be documenting the whole process on World for everyone's enjoyment. Yes, there is an issue with locating the starter. I have it worked out in my head, but that plan is subject to change when the plan contacts reality. |
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| 914forme |
Nov 6 2016, 07:09 AM
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#17
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Times a wastin', get wrenchin'! Group: Members Posts: 3,896 Joined: 24-July 04 From: Dayton, Ohio Member No.: 2,388 Region Association: None
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Large enough demand for said combo I am sure some one "Kennedy" will produce the combination for you / us.
Clay way to go, love your work. |
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| mb911 |
Nov 6 2016, 07:20 AM
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#18
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914 Guru Group: Members Posts: 7,254 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest
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QUOTE(ClayPerrine @ Nov 6 2016, 03:11 AM) QUOTE(eitnurg @ Nov 6 2016, 02:18 AM) QUOTE There are certainly other ways to skin a cat. How about a Boxster trans ? I thought the problem was that the Boxster trans has no provision for a starter motor? Or am I missing something here? (They're certainly cheap, though.......) I am building the adapter plate to put a G86-21 Boxster six speed behind my 964 motor. I will be documenting the whole process on World for everyone's enjoyment. Yes, there is an issue with locating the starter. I have it worked out in my head, but that plan is subject to change when the plan contacts reality. Oh that would be awesome.. |
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| McMark |
Nov 6 2016, 08:18 AM
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#19
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
Step 1: Build a mount that doesn't cost $1,000,000. Started this awhile ago, but now I finally have time to finish up the project.
Step 2: Finalize the cable shifter. With both Rob's (@ConeDodger) and Andy's (@SirAndy) cars headed to the shop, this will all be developed and completed in the next few months. The design goal is to have everything bolt on, no modifications, and be relatively cheap. |
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| 0396 |
Nov 6 2016, 09:33 AM
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#20
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Advanced Member Group: Members Posts: 2,046 Joined: 13-October 03 From: L.A. Calif Member No.: 1,245 Region Association: Southern California |
Well, I'm happy to see that there's interest in putting a 915 in a 914. I remember seeing various treads stating that the 901 was sufficient even for a 964....interesting thoughts on the longevity.
Clay's objective is very interesting. Especially with that monster 3.8 (IMG:style_emoticons/default/pray.gif) . Now, all we need is to see it at the track pulling away from some GT3. (IMG:style_emoticons/default/smile.gif) |
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