Quote:
Originally Posted by MetroMPG
Good point - for the figures I quoted comparing the spreadsheet output vs. real life, the alternator was in fact disconnected at the time.
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You know what... I suspect that the default on parasitic loads may not really matter that much, depending on how long your respective pulse and glide times are. The idle fuel burn rate incorporates those loads, so if your pulse time is short, you could effectively ignore calculating them during the pulse. But it would be simple to include an alternator load in there.
Obviously A/C makes a big difference and you can expect your FE to suck (technical term) with the use of such a device.
Another thing is if claims of companies like Synlube are to be believed, you can improve BSFC some small fraction, possibly dependent on rpm and perhaps load. It can also be added to wheel bearings etc, which would decrease Crr.
I made a mistake I think when I said automatics would have no issues, there are transmission losses to contend with. From what I remember, 8% is the figure generally given. So your BSFC would be reduced by 8% during the pulse. It would be helpful for someone more familiar with transmissions to comment here.
BTW I wrote the authors of that paper asking if they had the original data for those graphs. We'll see if I get a response.