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Old 07-25-2011, 03:45 PM   #11 (permalink)
California98Civic
Cyborg ECU
 
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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
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Quote:
Originally Posted by busypaws View Post
Anybody have a rule of thumb for difference in speed at start and end of pulse. It seems to me that anything less then 10mph makes it inefficient. I.E. I try to top out at 60mph and then glide down to 45mph. This on a 65mph road with little traffic. Only coasting down to 50mph seems ineffecient. If I pop the clutch put the throttle where I think the LOD should be about 75 -- by the time the SG starts reading its back to 60 and time to glide again.
Any community wisdom here?
Talking only about freeways here. I pick the minimum legal speed (10mph under posted limit) as my bottom. I use 10mph and 5mph differences. 10 on flats and down-hills, and 5 on inclines because I'm not confident that speeding up the hill is good for FE. The load % to seek will vary from engine to engine because we are trying to optimize for the BSFC map (even though many of us have never seen the map for our cars).

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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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