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#1
11-16-2004, 02:19 PM
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how to tell what gears are in my car
i guess the guy i bought my car from put gears in it without recalibrating the speedo. It is a 1999 z28 the speedo reads 40Mph at 33mph
and 50mph at 42mph and 60mph at 49mph and on and on. stock is 3.42 so i am guessing it has 3.73 or 4.10's , if anyone knows how to tell what gears i have or if it is something else causing the error on the speed o please tell me 
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#2
11-16-2004, 04:17 PM
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Re: how to tell what gears are in my car
here is the math to do ur problem.
(rpm)/[(final drive ratio)*(mph)*(336)/(tire height)]
__________________
 R.I.P. Andy, A great guy and an even better friend. 2000 Z28 A4: Patriot 226 cam, Comp 918's, Comp Ti retainers, HSW 100 shot, Vig 3600 stall, Richmond 3.73's, 2.5in TD's w/ H-pipe & 1-chamber flowmasters, 160* stat, TSP Lid, K&N filter, MSD wires. Buried Needle Racing!!!
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#4
11-16-2004, 09:02 PM
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Re: how to tell what gears are in my car
You could also check your RPO numbers and see that way.
__________________
RIP Hypsi - I just want to express I will never be the same after having lost such a good friend. You meant alot to me and I feel I am a better person for having known you. Til the day we meet again my friend you will always be in my heart. Mods: Weight reduction (I don't wear underwear)
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#5
11-16-2004, 09:33 PM
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Re: how to tell what gears are in my car
yea but he says that the guy he bought the car from has changed the gears. Which also reminds me that he is gonna have to know how fast exactly he is going to do the math. So scratch that. check and see how many times ur drive shaft turns in one complete turn of the rear wheels.
3and 1/4 turns =3.23 3and 3/4 turns =3.73s and so on
__________________
R.I.P. Andy, A great guy and an even better friend. 2000 Z28 A4: Patriot 226 cam, Comp 918's, Comp Ti retainers, HSW 100 shot, Vig 3600 stall, Richmond 3.73's, 2.5in TD's w/ H-pipe & 1-chamber flowmasters, 160* stat, TSP Lid, K&N filter, MSD wires. Buried Needle Racing!!!
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#6
11-16-2004, 10:07 PM
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Re: how to tell what gears are in my car
Oh I didn't bother to read that part cause I'm a dumb ass but you can always open up the rear and change the fluid. That will be one way but Z28's ways will work just fine too.
__________________
RIP Hypsi - I just want to express I will never be the same after having lost such a good friend. You meant alot to me and I feel I am a better person for having known you. Til the day we meet again my friend you will always be in my heart. Mods: Weight reduction (I don't wear underwear)
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#7
11-18-2004, 01:06 PM
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Re: how to tell what gears are in my car
or even better
call the guy you bought the car from and ask him what he put in it then call up madz28.com and get the computer calibrated so you know how fast you are going and all that fun stuff
__________________
95 TA - fast 92 240 - fun 96 prelude si - lots o fun 94 cr500r - rediculously fast and fun
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