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H-Man · 04-24-2016, 03:49 PM

If my transmission had 2 diff ratios and used it to reuse 4th and 5th, with a 3.1 high diff ratio and a 4.31 low diff ratio my RPM at 65 MPH would look like this:

Code:

gear     ratio            RPM
3rd      1.31*4.31      5096
4th     0.969*4.31     3770
5th     0.815*4.31     3171
4th H   0.969*3.1      2711
5th H   0.815*3.1      2280

As far as RPM goes, that 4H and 5H look pretty good, I'd be at cruising RPM at highway and freeway speeds. Right now I can hold 5th at 35 MPH and don't need to think about downshifting if I'm over 45 MPH.

04-24-2016, 03:49 PM	#56 (permalink)
H-Man The brake pedal is evil Join Date: Jan 2013 Location: Arizona Posts: 401 Denny's Detector - '08 Mercury Grand Marquis Taserface - '17 Chevy Volt Thanks: 5 Thanked 57 Times in 52 Posts	If my transmission had 2 diff ratios and used it to reuse 4th and 5th, with a 3.1 high diff ratio and a 4.31 low diff ratio my RPM at 65 MPH would look like this: Code: gear ratio RPM 3rd 1.314.31 5096 4th 0.9694.31 3770 5th 0.8154.31 3171 4th H 0.9693.1 2711 5th H 0.815*3.1 2280 As far as RPM goes, that 4H and 5H look pretty good, I'd be at cruising RPM at highway and freeway speeds. Right now I can hold 5th at 35 MPH and don't need to think about downshifting if I'm over 45 MPH. __________________ Getting sensor data off of a pre OBDII Toyota ECU via TDCL. All of this is on E10: Project E is my current focus.