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| MPG and Tires https://slantsix.org/forum/viewtopic.php?t=15927 |
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| Author: | Super 170 [ Fri Jan 27, 2006 5:33 pm ] |
| Post subject: | MPG and Tires |
HI Everyone I have a 66 val as a daily driver, 170 with super six conversion, 3 on the tree and a 7 1/4 rear. I have had the about 6 months and love it. I bought tires from BJ's and they had very few choices but a good price and I really needed to get something on the car as the ones I bought it with were dry rotted. When I drive thru a radar display at 40 it shows 37 but that is just an estimated speed. Can someone tell me how my Tiger Paws , P175-70 R13 are affecting my odometer and my MPG caculations and can I change speedometer gears to correct it. Thanks Steve |
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| Author: | emsvitil [ Fri Jan 27, 2006 9:27 pm ] |
| Post subject: | |
Original tire diameter was 24.65" or a 185/80 13 A 175/70 13 is 22.65" So your odometer/speedometer will read at least 9% high. Go with 10% for easy math............ So you'll need a speedometer gear that has 90-91% of the teeth than whatever is in there....... |
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| Author: | Super 170 [ Sat Jan 28, 2006 5:43 pm ] |
| Post subject: | 10% |
Thanks ED So if I am driving at 50 mph it is actually 45 mph and if I think I am getting 20 mpg it is actually 18 mpg? Steve |
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| Author: | emsvitil [ Sat Jan 28, 2006 5:49 pm ] |
| Post subject: | |
Yep.......... |
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