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Stude is gonna absolutely love me starting another thread. I can hear his blood pressure going up all the way out in Kansas. 
When I got the cold air intake for Red, it came with a tune. Since then, Red's speedometer has been wrong. It reads 5 mph faster than Red's actually going, per the GPS. I believe the GPS. So I want to fix Red's speedometer. My theory is that the tuner guy assumed Red had 19 inch wheels instead of 18 inch wheels.
My tuner has an adjustable parameter setting for Tire Revolutions Per Mile. I'm only assuming that would be for speedo calibration, but I sure don't know why that's a setting on the tuner. Today I jacked Red up and used one of those flexible cloth measuring tapes (from Unit's sewing kit) to measure the distance around the tread of Red's tires.
His tires are 85.25 inches in circumference. And according to a value conversion program I have, there are 63,360 inches in a mile. Using an expensive $2 calculator, I came out with a value to put into the tuner. Red's tires roll around 743.23 times in the length of a mile.
We'll see if that fixed the speedometer. It might not. I've punched in all kinds of numbers playing with it, and I'm not sure that tuner even has anything to do with the speedo, but the speedo for sure was right before I got that new tune.
When I got the cold air intake for Red, it came with a tune. Since then, Red's speedometer has been wrong. It reads 5 mph faster than Red's actually going, per the GPS. I believe the GPS. So I want to fix Red's speedometer. My theory is that the tuner guy assumed Red had 19 inch wheels instead of 18 inch wheels.
My tuner has an adjustable parameter setting for Tire Revolutions Per Mile. I'm only assuming that would be for speedo calibration, but I sure don't know why that's a setting on the tuner. Today I jacked Red up and used one of those flexible cloth measuring tapes (from Unit's sewing kit) to measure the distance around the tread of Red's tires.
His tires are 85.25 inches in circumference. And according to a value conversion program I have, there are 63,360 inches in a mile. Using an expensive $2 calculator, I came out with a value to put into the tuner. Red's tires roll around 743.23 times in the length of a mile.
We'll see if that fixed the speedometer. It might not. I've punched in all kinds of numbers playing with it, and I'm not sure that tuner even has anything to do with the speedo, but the speedo for sure was right before I got that new tune.
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