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v8carreragts
Joined: 05 Sep 2003
Posts: 665
Location: Tucson, AZ
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 Posted: Wed Jan 06, 2010 12:54 pm Post subject: |
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The 915 part is interchangable. 931.302.301.01/915.302.301.06 It is the part used on the Carrera GT. It is a stronger syncho ring. You can also use 928 synchros p/n 928.302.301,31 for 2nd and 3rd.
Porsche part numbers are easy to decode. The first 3 numbers are the model that the part was used on. The same part can be used on different models but just have a different prefix. The second and third set of numbers is the actual part number and the last are the revision number. For instance,
931.302.301.02 and 915.302.301.02 are the exact same part. 915.302.301.06 is just rev 6. |
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gegge
Joined: 27 Jul 2007
Posts: 1124
Location: Sweden
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| Posted: Thu Jan 07, 2010 7:24 pm Post subject: |
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915.302.301.06 was also used in the GTS, GTR and 933 according to the original spareparts catalogues.
The guide sleeve and shifting gear was the same in the turbo, GT, GTS, GTR; 931.302.401.00 and 931.302.227.00
The GTS and GTR used 930.302.301.00 as 2nd synchroniser ring instead of 931.302.301.01 but used special 937 shift and guide sleeves.
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Carl Fredrik Torkildsen
924 turbo -81 Carrera GT RESTOMOD
924 turbo -80 Dolomite De Luxe
924 -85 DP kit, BBS RS, M030 and tuned engine
924s -86 Black on black turbo with Fuchs |
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v8carreragts
Joined: 05 Sep 2003
Posts: 665
Location: Tucson, AZ
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| Posted: Fri Jan 08, 2010 12:12 am Post subject: |
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How about a picture of the GTR transaxle parts.......
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Fri Jan 08, 2010 12:27 am Post subject: |
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Now your just teasing us! 
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erstwhile owner of just about every 924 variant ever made |
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v8carreragts
Joined: 05 Sep 2003
Posts: 665
Location: Tucson, AZ
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| Posted: Sat Jan 09, 2010 5:37 pm Post subject: |
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Tease, tease, tease............
How about a GTR G31/50 differential case? |
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gegge
Joined: 27 Jul 2007
Posts: 1124
Location: Sweden
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| Posted: Sat Jan 09, 2010 6:29 pm Post subject: |
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More, more, more... 
_________________
Carl Fredrik Torkildsen
924 turbo -81 Carrera GT RESTOMOD
924 turbo -80 Dolomite De Luxe
924 -85 DP kit, BBS RS, M030 and tuned engine
924s -86 Black on black turbo with Fuchs |
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peterld
Joined: 10 Dec 2006
Posts: 981
Location: Noosa Heads QLD Australia
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| Posted: Sat Jan 09, 2010 8:07 pm Post subject: |
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Geez..... its not hard to go off some people......
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80/81 932/8 ROW |
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v8carreragts
Joined: 05 Sep 2003
Posts: 665
Location: Tucson, AZ
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| Posted: Sun Jan 10, 2010 3:40 pm Post subject: |
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I don't have anymore pictures if internals but here are some external pictures.
and just if you are wondering how a 930 ring gear compares to a G31....the diffs and bearings are the same but the bearings in the picture are different brands hence the different roller sizes. Kinda shows why the 930 is so strong.
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Shurick
Joined: 15 May 2005
Posts: 524
Location: Russia, Moscow.
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| Posted: Wed Jan 13, 2010 5:37 am Post subject: |
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So are G50 and G31 differential cases interchangeable?
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WBR, Shurick
'79 931 -- intercooled K26-3060-6.10 turbo @ 1.2 bar, EFI+EDIS, 951S brakes, stripped interior, 951 look.
'86 924S -- R.I.P.
https://www.instagram.com/ru_pacecar/ |
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v8carreragts
Joined: 05 Sep 2003
Posts: 665
Location: Tucson, AZ
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| Posted: Wed Jan 13, 2010 11:17 am Post subject: |
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| Quote: | | So are G50 and G31 differential cases interchangeable? |
No they are not. The G31; 016Z & Y, 915 and 930 transaxles share the same diff along with other parts. The G50's have nothing interchangeable with these. The G50 shares the diff with the 968 01E 6 speed.
The 924-early 944 (85/1) have a 7.1875" (183mm) ring gear, the 944S and S2, 951, 968 and G50 have a 7.40" (188mm) ring gear, the G31; 016Z & Y and 915 have a 7.875" (200mm) ring gear, the G50/50 (turbo) has an 8.46" (215mm) ring gear and the 930 has a 9" (228mm) ring gear.
The 924 and 951 all use the same gear sets (dimensionally) The 915 and G31 use the same gear sets (dimensionally) The 930 has wider gears and from what I understand, all G50's use the same gear sets (dimensionally), including the G50/50.
The 924/944/951/968 all use the same width and helix angle. The 915/G31/016Z & Y have the same width and helix but the helix angle is less of an angle than the 924/944/951/968 making the gears stronger and put less stress on the case/thrust washers/bearings. The 930 shares the helix angle with the 915/G31 but has wider gears. The G50's have the same helix angle as the 924.944/951/968.
The G31/1; G31/2; G31/3; 016Z & Y and G31/50 (Carrera GTR/GTP) use the same size gears and ring and pinion. The G31/3 (Carrera GT & GTS) GTR/GTP have shot peened gears and shafts though. |
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Shurick
Joined: 15 May 2005
Posts: 524
Location: Russia, Moscow.
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| Posted: Wed Jan 13, 2010 4:45 pm Post subject: |
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Thanks! Very helpful answer.
_________________
WBR, Shurick
'79 931 -- intercooled K26-3060-6.10 turbo @ 1.2 bar, EFI+EDIS, 951S brakes, stripped interior, 951 look.
'86 924S -- R.I.P.
https://www.instagram.com/ru_pacecar/ |
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michal928
Joined: 10 Sep 2008
Posts: 41
Location: Warsaw
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| Posted: Thu Jan 14, 2010 12:50 am Post subject: |
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In Warsaw Porsche Service they told me so: " the 931 302 301 02 and 915 302 301 06 are not interchangeable in porsche parts list."... Now I don`t know what to do... Buy this 915 and try to put this synchroring in the gearbox? What if this part will be wrong? I can`t return it back...
Ideola - you have synchrorings of 1st gear in your shop - what Porsche part number have this ring? |
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Thu Jan 14, 2010 1:16 am Post subject: |
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The 931 parts are No Longer Available. Period. And I wouldn't necessarily believe what the Porsche service shop advisor says...they will ALWAYS default to parts not being interchangeable, even though we know otherwise.
v8carreragts has proven that the synchros are interchangeable, as I believe he is currently running them in his gearbox. The synchros I am providing are 915 302 301 06 for the first gear, and 928 302 301 31 for 2nd and 3rd.
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erstwhile owner of just about every 924 variant ever made |
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v8carreragts
Joined: 05 Sep 2003
Posts: 665
Location: Tucson, AZ
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| Posted: Thu Jan 14, 2010 6:07 am Post subject: |
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The 915 and 928 parts interchanges perfectly. The Porsche Service you are using probably does not know how the numbering system worke and couldn't tell you about any interchangable parts. There are 1000's of these. Unfortunately Porsche doesn't number parts like most manufactures do. Most use the same part number when they use a part on another model but Porsche does not. They add the 900 number of the model number as a prefix to the part number. so it isn't evident to the average person that a part is the same.
Here are the parts side by side.
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michal928
Joined: 10 Sep 2008
Posts: 41
Location: Warsaw
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| Posted: Thu Jan 14, 2010 7:19 am Post subject: |
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| Thank you very much - now i am 100% sure. I will buy 915... Ideola - you have cheaper synchroring but postage and tax for parts from USA are killing good price... So i must buy parts in porsche service... But i don`t know how looks the dog teeth of the 1st gear -in my gearbox - if they will be look very bad I will be forced to buy them from you. Now i must have synchroring "in hand" to start working with the gearbox. In april I will be have first race and car must be ready. Thanks you all for help. |
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924 FAQ (Technical)
