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California98Civic · 03-09-2014, 10:33 PM

My stock 1998 DX tranmission had almost the same rpm/speed in 5th gear as my current 1993 CX transmission has in 4th gear. So I did a quick and dirty test just now, out of curiosity. In the below list, 4th gear is what my old DX transmission would have produced in fifth gear, while the displayed 5th gear number are for the super-tall 1993 CX (also VX) gearing that I now have. I welcome any ideas for a more rigorous test. I do not have cruise control on this car.

4th: 34.9 %Engine load, 2031rpm, approx 50mph, 59.5mpg
5th: 37.6 %Engine load, 1639rpm, approx 50mph, 66.8mpg

4th: 37.6 %Ld, 1891rpm, approx 45mph, 51.0mpg
5th: 47.5 %Ld, 1568rpm, approx 45mph, 53.3mpg

4th: 42.7 Ld, 2090rpm, 50mph, 48.0mpg
5th: 45.5 Ld, 1710rpm, 50mph, 56.3mpg

3: 37.3 ld, 2579rpm, 50mph, 45.7mpg
4: 35.7 ld, 2080rpm, 50mph, 58.3mpg
5: 34.1 ld, 1708rpm, 50mph, 75.1mpg

3: 36.5 ld, 2547rpm, 50mph, 45.9mpg
4: 40.5 ld, 2074rpm, 50mph, 48.9mpg
5: 47.5 ld, 1723rpm, 50mph, 55.8mpg

03-09-2014, 10:33 PM	#108 (permalink)
California98Civic Cyborg ECU Join Date: Mar 2011 Location: Coastal Southern California Posts: 6,299 Black and Green - '98 Honda Civic DX Coupe Team Honda 90 day: 66.42 mpg (US) Black and Red - '00 Nashbar Custom built eBike 90 day: 3671.43 mpg (US) Thanks: 2,373 Thanked 2,174 Times in 1,470 Posts	TEST: gearing, rpm, mpg My stock 1998 DX tranmission had almost the same rpm/speed in 5th gear as my current 1993 CX transmission has in 4th gear. So I did a quick and dirty test just now, out of curiosity. In the below list, 4th gear is what my old DX transmission would have produced in fifth gear, while the displayed 5th gear number are for the super-tall 1993 CX (also VX) gearing that I now have. I welcome any ideas for a more rigorous test. I do not have cruise control on this car. 4th: 34.9 %Engine load, 2031rpm, approx 50mph, 59.5mpg 5th: 37.6 %Engine load, 1639rpm, approx 50mph, 66.8mpg 4th: 37.6 %Ld, 1891rpm, approx 45mph, 51.0mpg 5th: 47.5 %Ld, 1568rpm, approx 45mph, 53.3mpg 4th: 42.7 Ld, 2090rpm, 50mph, 48.0mpg 5th: 45.5 Ld, 1710rpm, 50mph, 56.3mpg 3: 37.3 ld, 2579rpm, 50mph, 45.7mpg 4: 35.7 ld, 2080rpm, 50mph, 58.3mpg 5: 34.1 ld, 1708rpm, 50mph, 75.1mpg 3: 36.5 ld, 2547rpm, 50mph, 45.9mpg 4: 40.5 ld, 2074rpm, 50mph, 48.9mpg 5: 47.5 ld, 1723rpm, 50mph, 55.8mpg __________________ See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.