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Old 10-12-2008, 04:14 AM   #1
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Taller Overdrive MTX-75

I have a 2003 ZX3 which I guess would have an MTX-75 right? When I drive 55 I get about 35 - 36 mpg regularly, but if I got 65, it drops to as low as 28. I'm wondering if I can put in a taller overdrive gear, and leave all the other gears the same. Maybe something as extreme as 0.5:1 or somewhere around there. Can that be done, and would it help improve gas mileage?


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Old 10-12-2008, 11:30 AM   #2
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Originally Posted by ferrisworld View Post
I have a 2003 ZX3 which I guess would have an MTX-75 right? When I drive 55 I get about 35 - 36 mpg regularly, but if I got 65, it drops to as low as 28. I'm wondering if I can put in a taller overdrive gear, and leave all the other gears the same. Maybe something as extreme as 0.5:1 or somewhere around there. Can that be done, and would it help improve gas mileage?
Whats your RPM at? are you running 4.06 final gear?
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Old 10-12-2008, 12:04 PM   #3
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have you changed, plugs and plug wires ? gave the car a once over to make sure its running in top shape?
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Old 10-12-2008, 02:21 PM   #4
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It runs fine, it's always tended to get between 28 - 32 highway at 65, depending on the highway / city driving mix. I don't know what final drive ratio I have, but my rpm's are at around 2,700 going 65, and just over 2,000 at 55. I'd like to have them at 2,000 at 65, but I don't know if that would be a good idea or not.
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Old 10-12-2008, 03:55 PM   #5
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i get that mileage above the speedlimit... check alignment, air filter, plugs, fuel filter, tire pressure. Plus, you live in a more mountainous area, that can have an affect as well.
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