Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Black & Green modding thread (1998 Civic DX Coupe base)

E.Roy · 08-21-2014, 03:55 PM

Yeah, thank you for starting a mod thread, good place to share info.

I got my final drive ratios off the internets, so....
My info says the 5th gen DX/LX have 4.058:1 and 6th gen 3door EX Hatch (? If they made one?) had the 4.058:1, while the 6th gen DX/LX have 3.722:1.

My tire size is stock 185/65-14

Formula for top speed:

Engine RPM x Tire DIAM (inch) ÷ Final Drive Ratio ÷ Trans Gear Ratio x 0.002975

For my '99 EX:
185/65-14 ~23.7"
FD: 4.25
5th gear .702

So 5th gear 3,000rpm = 70.9mph

Some manufacturers tachs read high, so they are not always accurate

08-21-2014, 03:55 PM	#190 (permalink)
E.Roy fuel conserver Join Date: Oct 2013 Location: Buffalo, NY Posts: 76 Civic - '99 Honda Civic EX Thanks: 48 Thanked 15 Times in 13 Posts	Yeah, thank you for starting a mod thread, good place to share info. I got my final drive ratios off the internets, so.... My info says the 5th gen DX/LX have 4.058:1 and 6th gen 3door EX Hatch (? If they made one?) had the 4.058:1, while the 6th gen DX/LX have 3.722:1. My tire size is stock 185/65-14 Formula for top speed: Engine RPM x Tire DIAM (inch) ÷ Final Drive Ratio ÷ Trans Gear Ratio x 0.002975 For my '99 EX: 185/65-14 ~23.7" FD: 4.25 5th gear .702 So 5th gear 3,000rpm = 70.9mph Some manufacturers tachs read high, so they are not always accurate __________________ '02 E-350 7.3 Diesel (Work Van) '91.5 Cummins 4x4 (Old Blue) '00 Jetta TDI 5spd '22 Tundra TRD OR '04 RX330 '05 Tacoma 4x4 Last edited by E.Roy; 08-21-2014 at 04:01 PM..