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rallyboy
12-06-2007, 05:14 AM
anybody out there kknow the maximum speed /rpm for each gear 5 speed manual 1991 gt-s

celica91gts
12-06-2007, 07:58 AM
i have a 91 celica gts. sorry but i can only tell you the maximum speed for 1st and second gear. =D, thats cuz i only race through second gear. 1st gear takes me to 25 mph at 6200 rpm. 2nd gear takes me to 45mph at 6200 rpm. why do you ask?

partyball
12-06-2007, 01:48 PM
I cant remember for sure I did this a while ago
I think 3rd is around 70-75 at 6200 RPM 4th is almost 105 at 6200RPM
And 5th is upwards of that but you would need a 3 mile downhill road to max it out lol

rallyboy
12-06-2007, 08:37 PM
we race a 1/4 mile dirt oval , speeds are generally between 60 - 70 mph I was hoping to be able to keep it in 2nd gear but as you stated 45 mph is not enough Looks like I will have to constantly shift 2nd - 3rd hard on clutches

celica91gts
12-06-2007, 11:49 PM
lol. 2nd gear on a dirt track will just give you wheel spin if u shift hard.

rallyboy
12-07-2007, 04:23 AM
I'm thinking 3rd gear will lug in the corners

partyball
12-07-2007, 06:36 AM
3rd is still pretty peppy 4th gear is really where things go downhill in the 5s.

Carolina91GT-S
12-07-2007, 06:22 PM
Here is a small quote(part of a larger one) From torn in his Transmission conversion thread.

HE says the S53 transmission and the AllTrac Transmission have nearly the same gearing ratios and he lists what those Alltrac garing ratios are and what the top speed is in those gears at what RPMs...Hope this helps



Here's a chart I made of the different speeds I will get with stock tire diameter (215-15-50) and the ST185 tranny with its final drive.

Speed in KMH
RPM 1st 2nd 3rd 4th 5th reverse
1000 7 13 19 26 34 7
2000 15 26 37 51 68 14
3000 22 39 56 77 102 21
4000 29 52 75 102 136 28
5000 37 65 93 128 170 35
6000 44 78 112 153 204 42
7000 51 91 131 179 238 49
8000 59 104 149 205 272 56

Speed in MPH
RPM 1st 2nd 3rd 4th 5th reverse
1000 5 8 12 16 21 4
2000 9 16 23 32 43 9
3000 14 24 35 48 64 13
4000 18 32 47 64 85 18
5000 23 41 58 80 106 22
6000 28 49 70 96 128 26
7000 32 57 82 112 149 31
8000 37 65 93 128 170 35

The gears are about as close as an S53 tranny (get about 120 KMH in 5th @ 3500 RPM)

This is good for the track :)



The alltrac tranny is almost geared as the stock S53 tranny, which is good :)
-Phil