Gearing and RPM's ?!?!?! I think I suck at math!! help please

NEW_ZUKER

Gearing and RPM's ?!?!?! I think I suck at math!! help please

« on: May 02, 2007, 07:55:15 PM »

O.K I was doing a search and found out some "red-neck" math, and according to this "math"
if I had 32' inch tires, 4.89 t-case gears, .975 tranny gear, and 3.727 (3.73 I guess) diff. gears, I would need to get up to 12,137.something RPM's to get to 65 MPH!!!!! now I know for fact that math is not my greatest strength, but am I really this bad??? Pease help me, I'm going crazy.

I'm basically going to get 32x9.5 inch tires, and I want to go 65-75 MPH on the highway, what do I need (gearing wise) to do that?? I have a 1.3 stock engine in my 88.5 sammy. and stock everything else (for now

)

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Trackin92

Re: Gearing and RPM's ?!?!?! I think I suck at math!! help please

« Reply #1 on: May 02, 2007, 07:59:19 PM »

i dont know what your doing wrong but for the sake of Zuki's dont try to get 12,000 RPM's i think that would have to be a world record if you didnt blow your motor.

i hope you do know im just kidding

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cj

1276
0
I drive a really big ATV

Re: Gearing and RPM's ?!?!?! I think I suck at math!! help please

« Reply #2 on: May 02, 2007, 08:15:47 PM »

4.89 is you r low range. Do the math again using the high range ratio of your t-case gear.

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Trackin92

Re: Gearing and RPM's ?!?!?! I think I suck at math!! help please

« Reply #3 on: May 02, 2007, 08:22:12 PM »

now what do you get?

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bashzuk

784
1
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Been zuked lately!!!

Re: Gearing and RPM's ?!?!?! I think I suck at math!! help please

« Reply #4 on: May 02, 2007, 11:03:37 PM »

4.62's and stock transfercase with 32's I could do 70 with ease at 4k rpms or a little above.
hope this helps.

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Mean Green Wheeling Machine
88 Samurai 1" Shackles SPOA with 32" Tires
It's not a Jeep thing, it's not a Suzuki thing, or a Chevy,Ford thing.
It's a wheeling thing now get out and do it!

mrfuelish

2862
13
Gender:
you must have a perception problem.

Re: Gearing and RPM's ?!?!?! I think I suck at math!! help please

« Reply #5 on: May 03, 2007, 12:12:45 AM »

try 1.8 for your transfer case high range.

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1987,1988,1988,1990 samurai's, 1953 m38a1, 1996 x-90,blue.1996 x-90 red.1994 2 door tracker. only Dead Fish go with the flow. No Hairy Nosed Wombats were ran over on the trail today. My ZUK is Xenophobic.

ack

1659
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Professional askhole

Re: Gearing and RPM's ?!?!?! I think I suck at math!! help please

« Reply #6 on: May 03, 2007, 11:25:53 AM »

Go to Acks' FAQ (the link is in my signature) and play with the gear calculator. It has all the popular SJ-413 t-case gear combinations along with samurai/trackkick R&P combinations plus popular toyota 4x4 truck R&P combinations.

The calculator will also give you groundspeed based on optional engine speed and tire size inputs.

Hope this helps!

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Ack

'88 Samurai, '88.5 Samurai TT, '11 Ford Transit Connect XLT
Ack's FAQ http://www.acksfaq.com

NEW_ZUKER

Re: Gearing and RPM's ?!?!?! I think I suck at math!! help please

« Reply #7 on: May 03, 2007, 08:47:34 PM »

Sorry I havn't answered guys, just had 3 18 hour work days

Anyways, yeah u guys are right, if i do hit 12,000 revs, the zuks power plant will litteraly become a nuclear reactor

so trust me when i say, its not gonna happen. And the pointers, amazing, i was dump enough to use my low gears (the more u guys get to know me, the less you'll be suprised about stuff like this

) The 1.8 t-case ration did the trick. now I'm getting about 4200 rpm's
once again, you guys have not only saved my new engine, but also my ego. thanks a ton

And Mr. bashzuk, thats a very nice "toy" you have there

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