915 Gearing References

[gtgroupe3]

Greetings,

Does anyone have a proper list of the “Alpha’s” or letters for the 915 gear ratios?

I have already looked at Rennlist and Carquip, but the letters do not match up.

Does anyone have a factory listing?

I’ve updated the 901 gearbox calculators that have been posted with the 915gearing would like to have a proper listing prior to posting.

R/

[manu72S]

Hello

You have this link indicated on the early911sregistry website ( from http://early911sregistry.org/TechInfo.html )

901&915ratios

Manu

[gtgroupe3]

I already have that list (see orginal post) and it conflicts with other references.

http://members.rennlist.com/chuxter/901&915ratios.htm

[gtgroupe3]

Pardon the formatting did not carry over,
the gears with letters that do not match up are in bold.


915
Alpha Gears Ratio Rennlist
AZ 11:35 3.18 AZ
BY 12:34 2.83 BY
18/50 2.777
14/37 2.64 D
15/36 2.4 E
16/36 2.25
14/31 2.21
16/35 2.186
16/34 2.125
16/33 2.063

Alpha Gears Ratio
16/35 2.19
17/35 2.06
17/34 2
D 15/30 2 EU
T 15/29 1.93 ET
H 18/34 1.89 HY
HX 18/33 1.83 HX
HW 18/32 1.78 HW
W 19/32 1.68 JW
KW 20/32 1.6 KW
20/31 1.55
LD 21/30 1.43 LU

Alpha Gears Ratio
K 20/31 1.55
L 21/31 1.48 LV
LD 21/30 1.43 LU
LT 21/29 1.38 LT
MT 22/29 1.32 MT
DZ 30/38 1.27
NT 23/29 1.26 NT
SN 23/28 1.22 NS
SR 23/27 1.17 NR
ON 24/28 1.17 OS
OR 24/27 1.13 OR
PR 25/27 1.08 PR
PQ 25/26 1.04 PQ
QQ 26/26 1 QQ
QP 26/25 0.96 QP
RP 27/25 0.93 RP
RO 27/24 0.89 RO
SO 28/24 0.86 SO
SN 28/23 0.82 SN
SM 28/22 0.79 SM
TM 29/22 0.76 TM
TL 29/21 0.72 TL

Alpha Gears Ratio
PQ 25/26 1.04 PQ
QQ 26/26 1 QQ
QP 26/25 0.96 QP
RP 27/25 0.93 RP
RO 27/24 0.89 RO
SO 28/24 0.86 SO
SN 28/23 0.82 SN
ZD 38/30 0.79
NM 28/22 0.79
TM 29/22 0.76 TM
ZT 38/29 0.76
TL 29/21 0.72 TL
N 40/28 0.7
28/19 0.679
42/25 0.594