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Registered
Join Date: Feb 2008
Posts: 2,495
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915 4 speed, any value to the racers?
Ive got a friend with a 4 speed 915 gearbox in good shape from a 74 911. Is this a good box for racing? From what I understand, the 915 1st gears are the same and the last gears in both are the same but 2nd and 3rd are taller in the 4 speed box. Any thoughts here? Value assesment please??
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06-26-2008, 12:00 PM
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Alter Ego Racing
Join Date: May 2002
Location: Florida
Posts: 5,553
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4 speed 915? are you referring to a 930? All 915's were 5 speed (unless there is some odball one out there I've never heard of)
__________________
International GT Champion; Porsche GT3 Cup Trophy Champion; Klub Sport Challenge Champion; Rolex Vintage Endurance Series Champion; PCA Club Racing Champion; National Vintage Racing Champion |
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06-26-2008, 12:20 PM
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Registered
Join Date: Feb 2008
Posts: 2,495
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Thats exactly what I thought but one actually exists, its a fact. Just wondering where and how to use it or not use it. Would it be better on the track?
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06-26-2008, 12:29 PM
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Alter Ego Racing
Join Date: May 2002
Location: Florida
Posts: 5,553
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More speeds=more choices and better use of the powerband.
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International GT Champion; Porsche GT3 Cup Trophy Champion; Klub Sport Challenge Champion; Rolex Vintage Endurance Series Champion; PCA Club Racing Champion; National Vintage Racing Champion |
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06-26-2008, 12:35 PM
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It's a 914 ...
Join Date: Jan 2008
Location: Ossining, NY
Posts: 4,715
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I wouldn't use a 4 speed in track car, but the ratios in a 4 speed can sometimes be useful in re-gearing a 5 speed.
Scott |
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07-03-2008, 02:29 AM
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Irrationally exuberant
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The '74 4 speed 915 has a 7:31 ring and pinion with mechanic speedo drive - at least the last one I worked on did.
Just to be sure, I looked this up the '74 915's in the Spec book 915/16 4sp 7:31 R&P Gears: 11:35 20:32:25:26 29:21 915/06 5sp 7:31 R&P Gears: 11:35 18:33 23:29 27:25 29:21 -Chris
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'80 911 Nogaro blue Phoenix! '07 BMW 328i 245K miles! http://members.rennlist.org/messinwith911s/ |
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07-13-2008, 06:33 AM
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The Blue Pheonix
