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YelloRolla Forums Junkie Location: On your mum! Registered: May 2002	Re: 3TG + W55 + what diff ratio? Sat, 22 January 2005 07:41 I use 3.89 gears (I was told by many that it'd be noisy and it isn't). To get the RPM vs Speed I calculate it in 4th gear (1:1) @ 6000RPM and make all other calculations from there. I don't know if this is correct OR IF there is a quicker way. Tyre = 205/45/16 - where 45 = aspect ratio (0.45 x 205) = 92mm sidewall - sidewall x 2 = 184. Rim = 406mm. 406 + 184 = 590mm (rim + sidwall x 2 = rolling dia - for some reason the true rolling dia is usually bit less - say 10mm) Pi x dia = circumference OR 3.1416 x 580 = 1822mm (or 0.001822km) of travel per revolution (Tcir) Gear set = 3.45 - 6000/3.45 = 1739.13 tyre RPM x 60 = 104347.8 tyre RPH (Trph) Trph x Tcir = 190.122kph @ 6000rpm in 4th gear. RPM @ 100kmh = 100/190 x 6000 = 3158rpm (4th) Assuming 14% overdrive for 5th gear = 0.86 x 3158 = 2716 I say that 3.45 is geared too long for your engine and that 3.73 would be better. 373/345 x 3158 = RPM @ 100 in 4th with 3.73 gears (3414) [Report message to a moderator]

	Subject	Poster	Date
	3TG + W55 + what diff ratio?	tanman	Fri, 21 January 2005 22:26
	Re: 3TG + W55 + what diff ratio?	YelloRolla	Sat, 22 January 2005 07:41
	Re: 3TG + W55 + what diff ratio?	TurboRA28	Sun, 23 January 2005 04:59
	Re: 3TG + W55 + what diff ratio?	tanman	Sun, 23 January 2005 05:02
	Re: 3TG + W55 + what diff ratio?	YelloRolla	Mon, 24 January 2005 12:18
	Re: 3TG + W55 + what diff ratio?	tanman	Mon, 24 January 2005 19:10

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