Does anyone know if the Frontier's speedo needs re-calibration if switching from the 265/70-16 tire (SE) to the 265/75-16 tire (NISMO)?
By my calculations, the overall tire circumference would increase by 3 inches resulting in a speedo error of 3.4%. For example, when the speedo reads 60 mph, I'd actually be travelling 62 mph. Similarly, every 10,000 miles on the odometer would actually be 10,340 miles.
Is this an acceptable variance? If not, is there a part from the NISMO that could easily be swapped to the SE (speedo cable, gear, etc.)?
Does anyone know if the Frontier's speedo needs re-calibration if switching from the 265/70-16 tire (SE) to the 265/75-16 tire (NISMO)?
By my calculations, the overall tire circumference would increase by 3 inches resulting in a speedo error of 3.4%. For example, when the speedo reads 60 mph, I'd actually be travelling 62 mph. Similarly, every 10,000 miles on the odometer would actually be 10,340 miles.
Is this an acceptable variance? If not, is there a part from the NISMO that could easily be swapped to the SE (speedo cable, gear, etc.)?
I somehow doubt the average speedometer is accurate to within 3.4% of the true speed anyway. So there's probably not too much to worry about (IMO).
What Nissan probably did was to install the same parts in both the SE and the NISMO and not care about the circumference issue. I have a SE as well and I could swear that I'm not going quite as fast as my speedo says I am. That might have more to do with the other drivers around here, though.
Does anyone know if the Frontier's speedo needs re-calibration if switching from the 265/70-16 tire (SE) to the 265/75-16 tire (NISMO)?
By my calculations, the overall tire circumference would increase by 3 inches resulting in a speedo error of 3.4%. For example, when the speedo reads 60 mph, I'd actually be travelling 62 mph. Similarly, every 10,000 miles on the odometer would actually be 10,340 miles.
Is this an acceptable variance? If not, is there a part from the NISMO that could easily be swapped to the SE (speedo cable, gear, etc.)?
There are a couple ways you can check the accuracy of your speedometer, you can find a speed zone (usually near a school) where the local cops have one of those signs that tells you how fast your going, or get up on the highway, set your cruise to 60 mph and clock how long it takes to go from one mile marker to the next. If it takes you 60 seconds to go one mile at 60 mph, your dead on!
Any adjustment would probably have to be done by the dealership through the computer.
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or get up on the highway, set your cruise to 60 mph and clock how long it takes to go from one mile marker to the next. If it takes you 60 seconds to go one mile at 60 mph, your dead on!
Actually, you can use the mile markers directly to check against your odometer, or you could set your speed to 60 MPH (independent of the mile markers) and see if it takes 60 seconds for your odometer to read 1 mile travelled.
__________________
Jerry
2004 Frontier, King Cab, XE, 4x1, 4-cyl, 5-spd My Frontier Page
I have the same tire size that my truck came with. On my way to class today, I was playing around with my GPS. Traveling anywhere under 65 miles per hour, my truck was off by a couple of miles per hour. I decided to see how it did at higher speeds. When my speedo read 90 miles an hour, I was only moving at about 82-83 according to the GPS. The GPS had an excellent signal and I will have to check next time to see how many sattelites it was working with. The more sats. the more accurate. I will bring the GPS along to school tomorrow and check again.
I have the same tire size that my truck came with. On my way to class today, I was playing around with my GPS. Traveling anywhere under 65 miles per hour, my truck was off by a couple of miles per hour. I decided to see how it did at higher speeds. When my speedo read 90 miles an hour, I was only moving at about 82-83 according to the GPS. The GPS had an excellent signal and I will have to check next time to see how many sattelites it was working with. The more sats. the more accurate. I will bring the GPS along to school tomorrow and check again.
That's interesting. I'll take my GPS along with me on my way to work tomorrow and see what I come up with. Remember, the GPS units have a margin of error as well.
That's interesting. I'll take my GPS along with me on my way to work tomorrow and see what I come up with. Remember, the GPS units have a margin of error as well.
I understand that, but I believe that the more satellites you have, the closer to accurate it will be, even if there is a variance.( I would like to think it would be a very small one)
By my calculations, the overall tire circumference would increase by 3 inches resulting in a speedo error of 3.4%.
Checking the speedometer and odometer against my GPS was one of the first things I did when I bought my '05 NISMO CC. It turns out that the odometer is off by 3.2%. This almost exactly correlates to what you calculated. The speedometer is off by about 1-2mph (hard to tell exactly).
Along the same lines, by manually calculating the gas mileage, I noted that the computed gas mileage is less than actual by, you guessed it, just over 3%. This tells me that the fuel flow meter seems to be accurate, and that the error is totally in the odometer value.
I think I've also read that someone asked their dealer about adjusting the speedometer (they were installing "big" tires and a lift kit) and that the dealer said it could not be adjusted. I find that hard to believe, but that's what was said.
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