 915 Tranny Conversion Options |
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| Coloradocurt |
 Dec 26 2016, 09:10 AM
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#1
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Member  Group: Members Posts: 65 Joined: 20-November 16 From: Castle Rock, Colorado Member No.: 20,603 Region Association: Rocky Mountains  |
I've already done a good bit of searching and have yet to find what I'm looking for, so here goes-
Is there a good, comprehensive thread which explores/discusses the tradeoffs (functional performance, prices, availability) of the various options for converting a 915 tranny for adaptation to a 914-6 conversion project. Thanks. |
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Replies(20 - 26)
| brant |
Dec 28 2016, 02:51 PM
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#21
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914 Wizard Group: Members Posts: 11,639 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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I would add that there are less powerful motors that can use 1st gear
I run an "F" first gear ratio and use it for full on racing at 7800 RPM consistently for the last 10 years... but with only 180hp a 901 1st gear is good for 205hp and a 901R/P is good for 250HP in race conditions beyond that its cost effective for racing to build a 915 Street use... forget it I have 10K into my 901 and its simple math to look at life span and cost benefit ratios to figure out when to build a 15K race 915 |
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| Gary |
Dec 28 2016, 06:37 PM
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#22
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Senior Member Group: Members Posts: 744 Joined: 12-January 03 From: Mount Airy, MD Member No.: 134 Region Association: MidAtlantic Region
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QUOTE(mepstein @ Dec 28 2016, 03:42 PM)  One of my cars is a 3.2 with a 914 trans, one will have a 3.2 and a 915 trans with cable shifter and one will have a 3.3 suby 6 with a cable shifter suby trans. I like options (IMG:style_emoticons/default/smile.gif) How about a 3.2 with a cable shifter suby trans via a subarugears adapter? Have wondered if their type iv flywheel would bolt up. Then left with the need for custom axles for the subi inboard / porsche stub. |
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| Coloradocurt |
Dec 28 2016, 06:39 PM
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#23
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Member Group: Members Posts: 65 Joined: 20-November 16 From: Castle Rock, Colorado Member No.: 20,603 Region Association: Rocky Mountains |
QUOTE(slivel @ Dec 28 2016, 12:02 PM) I should add to my previous post that I do use a cooler that directs cooled gear oil to the gearset and the R&P. A side issue I've been researching really opened my eyes by the picture you posted. What "process" is needed to return weather-corroded magnesium cases (engine/tranny) or aluminum ones to the condition/appearance in your posted picture? Thanks. |
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| mepstein |
Dec 28 2016, 08:25 PM
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#24
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914-6 GT in waiting Group: Members Posts: 19,314 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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QUOTE(Gary @ Dec 28 2016, 07:37 PM) QUOTE(mepstein @ Dec 28 2016, 03:42 PM) One of my cars is a 3.2 with a 914 trans, one will have a 3.2 and a 915 trans with cable shifter and one will have a 3.3 suby 6 with a cable shifter suby trans. I like options (IMG:style_emoticons/default/smile.gif) How about a 3.2 with a cable shifter suby trans via a subarugears adapter? Have wondered if their type iv flywheel would bolt up. Then left with the need for custom axles for the subi inboard / porsche stub. Give it a try. |
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| Gary |
Dec 29 2016, 03:01 PM
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#25
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Senior Member Group: Members Posts: 744 Joined: 12-January 03 From: Mount Airy, MD Member No.: 134 Region Association: MidAtlantic Region
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Someday maybe. Up to my gills in work at OC right now.
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| Dave_Darling |
Dec 29 2016, 06:16 PM
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#26
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914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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I don't think this has been addressed yet:
The 901-based 914 transmission has a 1st gear that is cantilevered on the end of the main shaft. It is supported only on one side, which means it is easier to break than the other gears. If you transmit a lot of torque through it with a big shock-load, you can spin the thing off the shaft. I have heard that people with four-cylinder cars have lunched their 1st gear by redlining the motor and side-stepping the clutch. That's in addition to it being relatively short for high-torque applications. --DD |
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| porschetub |
Dec 30 2016, 02:00 AM
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#27
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Advanced Member Group: Members Posts: 4,706 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
The 915 isn't a great transmission,lots of noise and suffers syncro wear fairly early in life,you can buy a lot of 901 boxes for the price of a rebuild on one of these just saying.
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