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drag racing the short bus
Join Date: May 2002
Location: Location, Location...
Posts: 21,983
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7.35 ring and pinion for a 915 gearbox...
Sounds cool, huh? I was talking with Henry Schmidt at Supertec today, and he suggested it as a nice way to lower all the gear ratios from those of a 7.31.
Anyone have any experience with this? That mod must make the car quicker than a squirrel's second thought about a nut. (I thought I'd try out something other than the overused "raped ape" analogy...)
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The Terror of Tiny Town |
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11-13-2006, 05:37 PM
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That would make all the gears over 11% lower. Might make 1st sort of useless and 5th a bit buzzy, but should defninitely pull harder in each gear. Making the ratios closer together is preferable (but much pricier) to just changing the R&P. You'll still have the same rev drop on upshifts as before...
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2022 GT3 Manual, 73 Carrera RS 2.9 Twin-Plug MFI Carbon Fiber Replica Former: 18 GT3 Manual,16 Cayman GT4, 73 911S, Two 951S's, 996 C2, 993 C2, BMW 635CSi Euro, Ferrari 550 Maranello, 06 Evo IX w/ many mods |
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11-13-2006, 06:01 PM
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Once agan, just dropping the cwp ratio is not a solution for most uses.
It does not change the rpm drops which is the usual concern and speed in gears for say a 915/44 goes from ~ 33, 58, 85, 107, 130 to ~ 30, 52, 75, 95, 115
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Bill Verburg '76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone) | Pelican Home |Rennlist Wheels |Rennlist Brakes | |
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11-13-2006, 06:21 PM
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drag racing the short bus
Join Date: May 2002
Location: Location, Location...
Posts: 21,983
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Well...it was a cool idea while it lasted.
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The Terror of Tiny Town |
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11-13-2006, 08:55 PM
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Non Compos Mentis
Join Date: May 2001
Location: Off the grid- Almost
Posts: 10,597
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I left the 7:31 in my '73 when I did the 3.2 swap. The car weighs about 2200 lbs, so it's quite a bit quicker than a normal 3.2 powered 911.
The only downside is when autocrossing, I sometimes (rarely, actually) need to grab a bit of third gear. Still, well worth it. This car is not my daily driver. Between the short gears, stiff suspension, light flywheel and five-point harnesses, it's a bit high strung for much street driving. I couldn't be happier. |
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11-13-2006, 09:55 PM
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drag racing the short bus
Join Date: May 2002
Location: Location, Location...
Posts: 21,983
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Wow - 2200 pounds with a 3.2? Impressive. Is there any fiberglass on the car, or is just well trimmed?
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The Terror of Tiny Town |
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11-13-2006, 10:42 PM
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1973 Porsche Carrera RS 2.7 Replica 2.7RS
1976 Porsche Carrera 3.0
1995 Porsche 993 Carrera Coupe
