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Gear ratio/Tire size

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Offline takai

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Gear ratio/Tire size
« on: March 16, 2005, 06:09:00 AM »
Just trying to get some to double check my math.
Stock Samurai gears (3.73) with 215/75R15's would almost identical to 4.30 with about a 32 inch tire. Am I correct? Or would my old math teacher shake her head. :o
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Offline azrocktrash

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Re: Gear ratio/Tire size
« Reply #1 on: March 16, 2005, 06:54:10 AM »
Quote
Just trying to get some to double check my math.
Stock Samurai gears (3.73) with 215/75R15's would almost identical to 4.30 with about a 32 inch tire. Am I correct? Or would my old math teacher shake her head. :o



 the 4.62 works pretty good with a 31.
     oscar
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Offline takai

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Re: Gear ratio/Tire size
« Reply #2 on: March 16, 2005, 07:42:02 AM »
Looks like that would be about a 450 rpm difference at 65 mph. The 4.30's with 32's works out to about 300 rpm difference if my math is correct. I drive this rig 60 miles a day to and from work so I need to maintain highway drivability and the evil gas mileage figure. >:( Anybody else have some insight
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87 Sammi "Sir Tweak " Rockcrawler 4:1, Mighty Kong , 1.6 16V, Centerforce II, 2" Exhaust, Esteem seats. - Long gone
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mudfkr

Re: Gear ratio/Tire size
« Reply #3 on: March 16, 2005, 08:55:05 AM »
With R&P      3.73,  A high Range of 1.409, 5th of .795
Tire Diam      27.7" I get 3041 Rpm |removethispart|@ 60 Mph

Then with R&P of 4.3,  A high Range of 1.409, 5th of .795
Tire Diam      32" I get 3034 Rpm |removethispart|@ 60 Mph.

This was  done with an gearing calculator which is available online.  ;)
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Offline takai

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Re: Gear ratio/Tire size
« Reply #4 on: March 16, 2005, 11:05:35 AM »
Thanks. That confirms what I was getting. Just wanted to be sure that I was using the right formulas.
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Offline 87BlackSami

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Re: Gear ratio/Tire size
« Reply #5 on: March 17, 2005, 12:10:43 PM »
Don't forget to take into consideration rolling mass and friction. Even if you gear it to match stock, your going to lose some pep from your zuk. And when you don't have much pep to begin with, your going to want to go a little lower in the gears.  ;)
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Offline bottlemaker

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Re: Gear ratio/Tire size
« Reply #6 on: March 17, 2005, 05:49:03 PM »
4.30 would be 2/10 of one percent higher than your stock 3.73s.  ( 4.31 would be write on the money ) but 4.30  is darn near the exact same thing.
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Offline bottlemaker

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Re: Gear ratio/Tire size
« Reply #7 on: March 17, 2005, 05:51:31 PM »
Take that back, don't write on the money ( that's illegal ) Try right on the money,,,,duh   bottlemaker
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Offline takai

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Re: Gear ratio/Tire size
« Reply #8 on: March 18, 2005, 07:37:16 AM »
Loss of Pep. You must be joking. The pep I have ever had in my Sammi is Pepsi.  :o
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Offline tracker8wr

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Re: Gear ratio/Tire size
« Reply #9 on: March 18, 2005, 09:01:09 AM »
CALMINI ULTRA LOW 6.50:1 ROCKCRAWLER GEARSET

NEW RATIO! LOWEST AVAILABLE!



Unlike what's currently available in low range gear kits for the Samurai, you won't find any junky welded gears in this kit or the need to heavily alter the factory transfer case.   Our kit contains 4 completely new gears machined from billet material! Manufactured in the USA to exceed factory tolerances from quality SAE 8620 alloy. Now, you can re-gear your Samurai drive train completely through the transfer case. A TRUE 20.2% Hi-Range reduction will correct highway gearing for 32� -33" tall tires. A whopping 187% reduction in low range offers a range that is over twice as low as our current 4.16:1 kit - It’s almost too low for some instances. Either way, this is the lowest ratio gear reduction kit for your Samurai. We don't leave anything out - It's a complete kit sold with Input Shaft, High Output Gear, Low Output Gear, Counter Gear, Counter Shaft & bearings, thrust washers, gaskets and detailed instruction booklet. Installs like factory parts - NO GRINDING or CUTTING is required to install! It even comes with oil! The mandatory first step towards building an awesome off road Samurai.

USED IN U.R.O.C. COMPETITION !

MOAB SPECIAL THROUGH APRIL 1, 2005

VEHICLE PART NUMBER PRICE
1986-95 Samurai, SJ413 SS5031 $695.00 REG. $795.00



CALMINI 5.83:1 RING & PINION GEARS
MOAB SPECIAL THROUGH APRIL 1, 2005

VEHICLE PART NUMBER PRICE
1986-95 Samurai, SJ413 SS5031 $695.00 REG. $795.00


i say go with the reduction and get the lowrange for rocks and climbing and be good for the gears on the road.
« Last Edit: March 18, 2005, 09:02:20 AM by tracker8wr »
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Offline takai

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Re: Gear ratio/Tire size
« Reply #10 on: March 18, 2005, 09:46:48 AM »
Already got the reduction.  Luckily the former owner had already done that conversion.  ;D
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87 Sammi "Sir Tweak " Rockcrawler 4:1, Mighty Kong , 1.6 16V, Centerforce II, 2" Exhaust, Esteem seats. - Long gone
97 Tracker "Jezebel"  Bone Stock DD

'Cause, I am to misbehave.
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