Miles to Empty?
08-04-06, 09:15 AM
#31
Originally Posted by Gernby
Wheel and tire changes won't change gearing (or speedo / MPG calcs) unless the new tires have a larger or smaller outer circumference.
And then I pass them while they're at the gas stating refueling...
Javier
Last edited by javyLSU; 08-04-06 at 09:19 AM.
08-04-06, 12:48 PM
#32
Originally Posted by Shinobi-X
The size difference was the point I was making reference to, however regardless of this change, gearing will remain the same.
EDIT: I meant it would be the same as REDUCING the final drive ratio by 10%
Last edited by Gernby; 08-04-06 at 12:54 PM.
08-04-06, 01:15 PM
#34
Originally Posted by Gernby
It really doesn't matter if he has 17s, 18s, or 19s as long as the outer diameter of the tire is still about 26" (like stock). If the outer diamter of the TIRE changes, it will change overall gearing to the GROUND (engine cycles / mile). For example, if you go with a tire that has a 10% larger outer diameter, it will have a similar effect as increasing the final drive ratio (ring and pinion) by 10%.
08-04-06, 01:41 PM
#36
Originally Posted by Shinobi-X
You mean the final drive ratio and engine RPM changes... Stating "change gearing" didn't really describe what you meant specifically. Either way, what does this have to do with the speedo/mpg calculation potentially reading differently, if the wheel combo diameter has been altered?
Anyway, if someone changes out the stock tires with new ones that have a larger outer diameter, the speedometer, odometer, and MPG guages will all be effected inversely by the percentage of change in diameter. If you went with a tire that has a 10% larger outer diameter, then the guages will read 10% low. However, you can correct this by installing something like this.
08-04-06, 01:55 PM
#38
Originally Posted by javylsu
Great point, Gernby - I did some quick calculations, and the stock 18" rear summer rubber diameter is 559.2 mm, while Greg's setup (265/30-19) gives a total diameter of 561.5 mm - almost identical!
Javier
Javier
08-04-06, 02:53 PM
#39
Originally Posted by Gernby
Without reading over this whole thread again, I can't really remember what the argument is. LOL
Anyway, if someone changes out the stock tires with new ones that have a larger outer diameter, the speedometer, odometer, and MPG guages will all be effected inversely by the percentage of change in diameter. If you went with a tire that has a 10% larger outer diameter, then the guages will read 10% low. However, you can correct this by installing something like this.
Anyway, if someone changes out the stock tires with new ones that have a larger outer diameter, the speedometer, odometer, and MPG guages will all be effected inversely by the percentage of change in diameter. If you went with a tire that has a 10% larger outer diameter, then the guages will read 10% low. However, you can correct this by installing something like this.
08-06-06, 06:51 PM
#40
Pole Position
Join Date: Apr 2006
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I don't think the wheel set up really has much to do with my gas milage, ...yes it afffects it, but it is such a small difference, it's hard to argue. I have noticed that with the new exhaust, I've been a little more throttle happy to hear the beautiful song the Tanabe emits with a heavier foot.
I'll do a test on the next tank, take it easy(ier) and see what happens.
Greg
I'll do a test on the next tank, take it easy(ier) and see what happens.
Greg
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