Rick Simons
Member
- Joined
- Sep 27, 2019
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In an attempt to increase my speedometer's accuracy I've been experimenting with the tire revs/mile setting on my SCT (Bama) tuner. However, I'm getting different results than expected:
My tires are 26" tall, which should mean a circumference of 81.64 in. Divide this into the 63,360 inches in a mile and I get 776 tire revs/mile. But if I set the revs/mile to 776 in the tuner, the speedo reads WAY too high, as in 90 +/- at a calculated 70 mph.
Before I started, the tire revs/mile was set at 755, and the speedo was close, maybe 2-3 mph fast.
I have 3:73's and this has been changed in the tune by Lito already. Can it somehow think it still has 3:55's?
Or am I missing something obvious? (always a possibility with me)
My tires are 26" tall, which should mean a circumference of 81.64 in. Divide this into the 63,360 inches in a mile and I get 776 tire revs/mile. But if I set the revs/mile to 776 in the tuner, the speedo reads WAY too high, as in 90 +/- at a calculated 70 mph.
Before I started, the tire revs/mile was set at 755, and the speedo was close, maybe 2-3 mph fast.
I have 3:73's and this has been changed in the tune by Lito already. Can it somehow think it still has 3:55's?
Or am I missing something obvious? (always a possibility with me)