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#1
10-10-2006, 10:29 PM
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checking Gear ratio
Now i cant remember, i think if you jack up the rear and spin the tire and count how many times the driveshaft spins to make a complete rotation of the tire, or the other way around adn that how you get the rear gear ratio?
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#2
10-11-2006, 01:17 AM
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Re: checking Gear ratio
Yep, count the number of rotations of the drive shaft.
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 R32 GTR w/351w .020 forged, 8.9:1, PTK T76, Turbosmart 40 BC & 45 WG, Tial 40 BV, AFR 205s 310/245, 228/228 550/550 114 Hydro, 1.7rr, Isky RLs, 4" HKS exhaust, ARC 30x16x4 IC, 8 point cage, C2 gauges, 2 step, C4 3200 stall w/ R Manual & Hurst Ratchet shifter, 17" Panasport G7s, CSU 750 & bonnet, Vic Jr intake, 3.63 gears, Corbeau Carrera seats, Custom wide body, Bomex side skirts and rear 1/4 caps, Tommy Kaira bumper.
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#3
10-11-2006, 01:33 AM
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Re: checking Gear ratio
Yep, the numbers of times the driveshaft spins in one rotation of the tire is the correct way of finding out your gears.
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#4
10-11-2006, 12:15 PM
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Re: checking Gear ratio
sweet, cause i got rid of my rear with the 4:11 posi in it and i picked this one up n the guy says he thinks there are gears in it but hes not sure so i wanted to check...
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#5
10-12-2006, 08:06 PM
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Re: checking Gear ratio
well the driveshaft spun twice in one rotation of the tire...What gears would that be?? something don't seem right here...stock pony wheels are on the car also i know that can matter....
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#6
10-12-2006, 08:24 PM
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Re: checking Gear ratio
The size of the tires or wheels make no difference. One revolution is one revolution. You need to turn both wheels exactly one turn in the same direction, or the differential gears will throw your drive shaft and pinion count off.
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#7
10-12-2006, 09:00 PM
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Re: checking Gear ratio
i cant spin em both in the same direction its not a posi
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#8
10-15-2006, 12:21 AM
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Re: checking Gear ratio
Well I can, and until you figure out how to turn both axles exactly one turn. you do not stand a chance of guessing at the gear ratio. Couldn't you have looked inside and read the tooth count by now? Don't you have any friends that will help you turn both wheels at the same time and count the drive shaft.
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#9
10-15-2006, 11:43 AM
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Re: checking Gear ratio
Quote:
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#10
10-15-2006, 11:20 PM
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Re: checking Gear ratio
ill have someone give me a hand later when its not so cold out and check again
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#11
10-16-2006, 09:24 PM
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Re: checking Gear ratio
You can turn the driveshaft and pinion but if both axles don't turn the exact same one turn your estimate will be off. It is possible to turn the pinion and observe one axle turning, and the other axle may not turn at all, or it may turn in the opposite direction.
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#12
10-17-2006, 04:30 PM
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Re: checking Gear ratio
ok now that sounds about right..ima try that whenever it stops raining...according to the news that'll be thursday
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#13
11-12-2006, 08:14 PM
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Re: checking Gear ratio
If you have a differential, you can hold one wheel totally still while the other wheel is spun one full rotation. This will spin the drive shaft half the distance it needs to spin to tell you the ratio. Next hold the other wheel still and spin the previously still wheel one full rotation. How ever many times the driveshaft has turned is you gear ratio.
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#14
11-13-2006, 09:09 PM
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Re: checking Gear ratio
ive never heard of that being done before....but if its true then on the first wheel the driveshaft spun twice on the other it spun 2 more times...so thats 4 times total for 1 tire rotation on each side, whats the gear ratio?
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#15
11-14-2006, 02:15 AM
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Re: checking Gear ratio
Drive the car in 4th gear(if its a manual) going 60mph, let me know what RPM you are at and I can tell you what ratio you are.
__________________
R32 GTR w/351w .020 forged, 8.9:1, PTK T76, Turbosmart 40 BC & 45 WG, Tial 40 BV, AFR 205s 310/245, 228/228 550/550 114 Hydro, 1.7rr, Isky RLs, 4" HKS exhaust, ARC 30x16x4 IC, 8 point cage, C2 gauges, 2 step, C4 3200 stall w/ R Manual & Hurst Ratchet shifter, 17" Panasport G7s, CSU 750 & bonnet, Vic Jr intake, 3.63 gears, Corbeau Carrera seats, Custom wide body, Bomex side skirts and rear 1/4 caps, Tommy Kaira bumper.
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