Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Largest Tire Diameter on a 6th Gen Civic (for lower RPM)

PaleMelanesian · 03-10-2009, 04:28 PM

I have the same 2500 rpm at 60.

The 5th and 6th gen transmissions are interchangeable. If you can find a Cx/VX trans, you'll get that rpm drop while keeping your same wheels/rims. It shouldn't cost a whole lot more, either. I haven't done it because I don't do that much highway driving. If I did, it'd be done by now.

Remember, too, that larger diameter tires will have much worse rotational inertia. Nearly all the mass of a tire is on the outer diameter, at the tread / steel belts. Any time you change speeds, it'll be working against you - massively.

03-10-2009, 04:28 PM	#3 (permalink)
PaleMelanesian Hypermiler Join Date: Dec 2007 Location: Texas Posts: 2,321 PaleCivic (retired) - '96 Honda Civic DX Sedan 90 day: 69.2 mpg (US) PaleFit - '09 Honda Fit Sport Team Honda Wagons 90 day: 44.06 mpg (US) Thanks: 611 Thanked 434 Times in 284 Posts	I have the same 2500 rpm at 60. The 5th and 6th gen transmissions are interchangeable. If you can find a Cx/VX trans, you'll get that rpm drop while keeping your same wheels/rims. It shouldn't cost a whole lot more, either. I haven't done it because I don't do that much highway driving. If I did, it'd be done by now. Remember, too, that larger diameter tires will have much worse rotational inertia. Nearly all the mass of a tire is on the outer diameter, at the tread / steel belts. Any time you change speeds, it'll be working against you - massively. __________________ 11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles