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Gears
Oct 6, 2003 9:55:11 GMT -5
Post by Eric on Oct 6, 2003 9:55:11 GMT -5
Most Troopers after '98 have 4.30:1 gears. That means that the driveshaft rotates 4.3 times in the same distance that it takes the axles to rotate once. The higher the driveshaft:axle ratio number is, the "lower" the gearing is. For example, with all other factors being equal, you'd travel 25% further on 3.08 gears at the same engine RPM as you would on 4.10 gears, but your torque is multiplied by 25% with 4.10 gears from 3.08 gears when you're towing or off-road. So, the higher the number, the slower you move at the same engine speed, but the better control you get off-road, and torque is set up much better for drag racing and towing. It's a trade-off.
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IsuzuRS
Full Member
"Your not really 4wheelin unless you get it stuck."
Posts: 70
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Gears
Nov 16, 2003 1:22:51 GMT -5
Post by IsuzuRS on Nov 16, 2003 1:22:51 GMT -5
Like how when you get some 38" tires stuffed under, you want a higher gear box ratio, am I right? Because the tires are so large, the do less rotations to get you the same distance a 31" tire would go in more rotations. Thats why I want some 33" narrow tread(like 225 metric) for highway traveling, so the mpg would up.
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Gears
Dec 2, 2003 20:38:09 GMT -5
Post by Zaphod on Dec 2, 2003 20:38:09 GMT -5
Thanks, ERS, for explaining that, as I had never been able to understand the whole gearing thing.
It's true that wider tires get you further per revolution than narrow ones, thus improving milage. However, you also have to consider the fact that it takes more power to turn a larger (i.e. - heavier) wheel, so at some point there comes a tradeoff.
I'm afraid I can't comment on the gear ratio vs. tire size issue. Don't have a clue....
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Gears
Dec 4, 2003 13:16:10 GMT -5
Post by BigSwede on Dec 4, 2003 13:16:10 GMT -5
It's true that wider tires get you further per revolution than narrow ones, thus improving milage. No...a "wider" tire usually refers to the tread width, side to side. A wider tire does generally get slightly poorer gas mileage than a narrower one, but only because of rolling resistance, not due to any difference in distance per revolution. If you replace the word "wider" with "larger diameter", and "narrow" with "smaller diameter", then your statement works.
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Gears
Jan 12, 2004 23:50:51 GMT -5
Post by Eric on Jan 12, 2004 23:50:51 GMT -5
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IsuzuRS
Full Member
"Your not really 4wheelin unless you get it stuck."
Posts: 70
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Gears
Feb 13, 2004 1:08:59 GMT -5
Post by IsuzuRS on Feb 13, 2004 1:08:59 GMT -5
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Gears
May 24, 2004 14:07:21 GMT -5
Post by Eric on May 24, 2004 14:07:21 GMT -5
You sure they aren't 4.56s? It would be the first time I've heard of 4.55s in an Isuzu.
Not that it matters. .01:1 doesn't make much of a difference. It might be totally unnoticeable, even on pavement.
There are plenty of people running 4.11 front ends and 4.10 rears with no problems.
I dunno.
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Gears
May 25, 2004 7:17:52 GMT -5
Post by lee0726 on May 25, 2004 7:17:52 GMT -5
He is correct in saying 4.55's, that is what the manual says in the 93 RS. Technically it probably should say 4.56 b/c the actuall number is 4.55555555555. I guess Isuzu just doesn't round up..... (maybe that is why they aren't doing so well, they suck at math.)
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