tires - Dodge Dakota Forum

Subject: tires
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I have 02 quad I put tires on it the stock tire r p255 65 16 and i put lt255 70 16 about an inch and half tall and my miledge dropped 4 to 5 mpg is there anything i can to help the miledge for except swapping tires back to stock. At first thought maybe O2 sensors it runs to go to be that, no heavy black smoke or lot of black on exhaust help I was wondering can the dealer flash the computer for the bogger tires also wheres the best place to get a superchip programmer

93dak4x4
Dodge Dakota
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12/11/2004
10:17:41

RE: tires
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when you changed your tire diameter you changed your gear ratio making it harder for your truck to push itself along, the only way you can pick that back up is go back to stock size or re-gear

tc
Dodge Dakota
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12/13/2004
19:05:24

RE: tires
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your MPG may not be as bad as you think. when I switched from 195/75/15 to 31/10.5/15's It threw off my speedometer & odometer by around %15. therefor, I was travelling %15 more distance than the odometer stated. try figuring out if your speedo/odo is off and add that distance to your MPG calculation. the ratio change you made will affect your city more than highway

jared
Dodge Dakota
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12/13/2004
20:36:23

RE: tires
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The superchips programmer should allow you to calibrate for bigger tires.

However, I don't think that the speedo being off is most of your loss. My Dakota also has the 255/65/16 tires in it. They measure approx 28.5 inces tall. From this it is known that circumferance of the tires is approx 89.5 inches. If you gained 1.5 inches in height with the taller tires you gained aprrox 4.7 inches in the circumferance of the tires on your truck. That means that the tires are 5.3% bigger around than they were before, which means that your speedo is off by 5.3% (at 55 mph on your speedo you are really going about 57.9 mph). This shows that for every 100 miles you travel, you have really gone 105.3 miles. This does not account for all the mpg loss that you have seen on your truck.

The programmer may help you get back some of your mpg. Maybe someone that has done this will share with you.

Sorry for the strange responce. I am a science/math geek

Good luck

QC DAKOTA
Dodge Dakota
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12/15/2004
12:22:37

RE: tires
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Thanks jared for your help.I like to know who has the best price on the superchip programmer

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