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Auto tuner needed with 240tire?

4120 Views 26 Replies 13 Participants Last post by  bandit85, 
T
Added a 240 metzler tire and lowered my bike last week but noticed lower mpg. Do I need to use a auto tuner to get my gas milage back? Has anyone had this problem?
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WildFan
Well, not to sound like an ass but that's pretty obvious. The calculation is a ratio and therefore is more distorted at a higher speed (higher number).
Eventually I see GPS technology being used for speedos. That way, your speedo would always be accurate no matter what tire size, or other modification done to the vehicle.
[/quote]
I realize the math is obvious, mainly just pointing out that it was off on the bikes, not the other vehicles
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immortal13
Gotcha.....just didn't wanna seem like an ass :p
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toby
MY said:
Immortal that is interesting and does make sense. Only problem is, What happens if a Sat goes down, bad zone or other problems? Then you have no way to figure out what speed your going. There would have to be some sort of back up plan. Also is not the odometer somehow connected to the same point that is used for speed?

Any one want to answer the question on, "If auto makers set the speedo off a bit, then why does my speedo match my GPS perfectly?
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I would guess that at some point your car has been calibrated and has larger tires than what it was designed for. If you read thoroughly the link I posted it explains all of that and the fact that different models are different. Being a bigger gap on more expensive cars than others.
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T
So bigger tires equals more accurate speedo? How big a tire would through the speedo to show less then what you are traveling?
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toby
tremorous said:
So bigger tires equals more accurate speedo? How big a tire would through the speedo to show less then what you are traveling?
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here is a link where you can find the formula to calculate that.
http://forum.studebakerdriversclub....dern-tire-size-and-speedometer-odometer-error
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immortal13
tremorous said:
So bigger tires equals more accurate speedo? How big a tire would through the speedo to show less then what you are traveling?
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It's really simple if you think about it. The speedo counts revolutions of the wheel to calculate speed. When you put a bigger tire(diameter not width), it takes longer for the wheel to make one revolution. So the speedo thinks you're going slower even though you have covered the same distance.

This is very common with trucks. I run a bigger tire than the oem, so the speedo reads a few miles slower than I'm actually going.
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B
safetydanny said:
Sooooooooo does anyone know the answer to Toby's post?! Great stuff Toby!
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I can answer it to you the best I can.

Toby is obviously an educated guy and knows his $hit. The reason you can't understand is because you are more worried about looking at boys naked than trying to figure out what is wrong with your bike.
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