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my biggest issue with the stock 50/03 (that i still have in my convertible) is the step from 2 to 3... For some tracks with tight 2nd-gear corners, it is IMHO a to wide spread... With the lower 3rd (and 4th and 5th) gear in my situation i have now the additional advantage for the nordschleife that i do not need the 2nd gear anymore.. I can use it in adenauer forst and perhaps wehrseifen, but it is not necessary nor really usefull.. it is more "it the 2nd suits, i have been to slow in this lap"....
Gearing a 5speed 964 box is like choosing your dress for a first date.. there are so many options but you can just be sure about the result if you have tried it...
Well stated. I don’t plan on trying on any dresses, so for me it’s a bit like marrying a blind date. I’d like to think that the Porsche engineers knew what they were doing with the RS configuration for 1 and 2. I will likely follow their lead, and close up the gaps a bit on 3-5 as you did.
Well stated. I don’t plan on trying on any dresses, so for me it’s a bit like marrying a blind date. I’d like to think that the Porsche engineers knew what they were doing with the RS configuration for 1 and 2. I will likely follow their lead, and close up the gaps a bit on 3-5 as you did.
if you can get your hands an a set of porsche oem 1st and 2nd gear - do it! And spend another money to shorten the gap from 4 to 5 :-)
if you can get your hands an a set of porsche oem 1st and 2nd gear - do it! And spend another money to shorten the gap from 4 to 5 :-)
Thanks, still waiting for my Indy to crunch some numbers but that is the plan. I’m told the RS 1st gear can be had for about $1,400. Steel synchros from Porsche Motorsports have been ordered.
Thanks, still waiting for my Indy to crunch some numbers but that is the plan. I’m told the RS 1st gear can be had for about $1,400. Steel synchros from Porsche Motorsports have been ordered.
from porsche order number the 1st gear with the shaft was in the 4k € ballpark two or three years ago... Gearset 2 was in the 2k€ ballpark... Would be happy for you, if this would be cheaper nowadays in the states...
Most of the reconfigurations that I’ve seen retain either a stock G50/03 first gear or second gear. I like the configuration QuiquedB went with (3.154, 2.059, 1.50, 1.174 and .967), and I’m posting this below as “Version 4” which compares the new version to stock RS.
But I’d like to stay true to the RS gear ratios for both first and second gear. So we tried swapping out the 2.059 2nd gear on the spreadsheet for 1.895 like the RS, using the rest of the custom ratios for 3-5 as noted above. I’m posting the printout for that below as well. 3rd gear isn’t ideal here, but this was close.
So I went back to the drawing board and re-tooled 3 and 4 a bit. Much of this was based on the feedback here on Rennlist and this thread, and particularly comments from Bill V and Matt at Guard Transmission. Thank you.
1st 3.154
2nd. 1.895
3rd. 1.474
4th. 1.16 (1.174 another option, more for street)
5th. .967
You can see this last configuration in Version 6 below, comparing to the G50/03 stock configuration. This is the current plan. I hope these graphs help others falling down this rabbit hole.
How do your power an torque curves look like? – Did you take them into account when choosing the rations or are you just going by max. RPM of the car?
Thanks,
Michael
Micheal,
what i took in account was the Supertest in the Sportauto of the Porsche-Museum 964RS.. from that lap i used the top-speed at Döttinger Höhe - which was 246 - as the maximum speed i would/could reach at a european track. Christian Gepard is a fast driver an i thought, the Museum RS would be also be a the better side of 3.6 M64 engines...
My engine is a 3.6 with cams, headers, more compression, some mods for a better flow... nothing special, but it is strong, compared to my convertible with a fresh stock 3.6 M64. So assume 300`ish horsepower...
I will also be adding steel synchros for 2,3,4. The car is scheduled to go in next month for the re-gear. Thanks to Matt at GT for the advice and input. And thanks again to Bill V for all the invaluable information on this thread!
Great to hear you’re moving forward. Even better knowing how much research you did which validates the gearing you went with. I’m not to far off from what you’re going with and I’m pretty happy with my set up.
3.5
1.895
1.407
1.174
1.0
I will also be adding steel synchros for 2,3,4. The car is scheduled to go in next month for the re-gear. Thanks to Matt at GT for the advice and input. And thanks again to Bill V for all the invaluable information on this thread!
07-16-2023, 11:31 AM
