experiences with final drive ratio
#45
For example the part number for a mechanical speedo drive for an NA with 3.636 gears is M502-17-441. It obiviously wasn't designed for that application, but it is accurate.
There has to be a calculator somewhere to calculate this.
#49
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the speedo is optimistic to begin with. mine is dead on now with my 3.90 swap as compared to my GPS and the dyno. I swapped from a 94 though. Tire size affects speed calibration too so you gonna account for that in your gear selection?
#52
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Perhaps. But I'm not at all displeased with my 4.10s that I have now. I'm either going to keep the 4.10 and put an rx7 5th gear in the trans, or maybe even jump on a 6 speed with the 3.63s we've been selling at $320. Depends on the $$$ situation after the motor.
#59
Gear Mph per 1000 RPM Mph @7200 RPM Mph @7200 RPM
--------------------------------------------------------
1 6.03 43 43
2 10.01 72 72
3 14.22 102 102
4 18.91 136 136
5 23.23 167 167
Mph RPM (in Gears)
-------------------------------------------------
1 2 3 4 5
-------------------------------------------------
5 829 499 352 264 215
10 1659 999 703 529 431
15 2488 1498 1055 793 646
20 3317 1997 1407 1058 861
25 4147 2496 1759 1322 1076
30 4976 2996 2110 1587 1292
35 5805 3495 2462 1851 1507
40 6635 3994 2814 2116 1722
45 4494 3165 2380 1937
50 4993 3517 2644 2153
55 5492 3869 2909 2368
60 5991 4221 3173 2583
65 6491 4572 3438 2798
70 6990 4924 3702 3014
75 5276 3967 3229
80 5627 4231 3444
85 5979 4496 3659
90 6331 4760 3875
95 6683 5025 4090
100 7034 5289 4305
105 5553 4521
110 5818 4736
115 6082 4951
120 6347 5166
125 6611 5382
130 6876 5597
135 7140 5812
140 6027
145 6243
150 6458
155 6673
160 6888
165 7104
Gear Change RPM drop (change @7200) RPM drop (change @7200)
-------------------------------------------------------------
1 -> 2 -2865 (to 4335) -2865 (to 4335)
2 -> 3 -2128 (to 5072) -2128 (to 5072)
3 -> 4 -1786 (to 5414) -1786 (to 5414)
4 -> 5 -1339 (to 5861) -1339 (to 5861)
--------------------------------------------------------
1 6.03 43 43
2 10.01 72 72
3 14.22 102 102
4 18.91 136 136
5 23.23 167 167
Mph RPM (in Gears)
-------------------------------------------------
1 2 3 4 5
-------------------------------------------------
5 829 499 352 264 215
10 1659 999 703 529 431
15 2488 1498 1055 793 646
20 3317 1997 1407 1058 861
25 4147 2496 1759 1322 1076
30 4976 2996 2110 1587 1292
35 5805 3495 2462 1851 1507
40 6635 3994 2814 2116 1722
45 4494 3165 2380 1937
50 4993 3517 2644 2153
55 5492 3869 2909 2368
60 5991 4221 3173 2583
65 6491 4572 3438 2798
70 6990 4924 3702 3014
75 5276 3967 3229
80 5627 4231 3444
85 5979 4496 3659
90 6331 4760 3875
95 6683 5025 4090
100 7034 5289 4305
105 5553 4521
110 5818 4736
115 6082 4951
120 6347 5166
125 6611 5382
130 6876 5597
135 7140 5812
140 6027
145 6243
150 6458
155 6673
160 6888
165 7104
Gear Change RPM drop (change @7200) RPM drop (change @7200)
-------------------------------------------------------------
1 -> 2 -2865 (to 4335) -2865 (to 4335)
2 -> 3 -2128 (to 5072) -2128 (to 5072)
3 -> 4 -1786 (to 5414) -1786 (to 5414)
4 -> 5 -1339 (to 5861) -1339 (to 5861)