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Old 04-13-2013, 09:24 AM   #10 (permalink)
Cyborg ECU
California98Civic's Avatar
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,092

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: 2,307
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Originally Posted by Old Mechanic View Post
6k RPM on the VX tranny is something like 120 MPH in 3rd gear! The tall overdrive gives you a much better highway cruising gear. The lean burn VX engine would pull from 30 MPH at 1000 RPM, at least in mine it would, even with the AC on.

Gearing is tall! So I am continuing to experiment with its tallness. Fifth gear has me in the 2100-2200 range at 65 mph. I used to cross 2000 at about 50 mph with the DX coupe's stock transmission.

Hill climbing "experiment": I put the instant mpg gauge back onto my main display on the ultra gauge. I can slide into 5th gear at 45-50 mph, down around 1600 rpms and accelerate easily, so sometimes I climb long and steep hills in that gear where the speeds are 45 or 50 and cars are everywhere on two lanes. I can go up to 79% load and stay at 30 or 31 mpg (climbing a hill at high load!); my old DX tranny could only do 23 or 25 mpg up this same hill in fifth gear. My goal climbing this hill is only to maintain speed for a few seconds until I can position better or find out if a light ahead will be green, stale, or red.

The '93 CX tranny is making it easier for me to drive at speed limit more often without dipping below my daily goals of 60mpg. Warmer weather is also a factor, but I don't really don't think it's the whole story because right now my average speed has probably increased significantly while my MPG is also going up.
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.

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