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Thread: Theory: Increased Engine load leads to better fuel economy

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Posts: 21-23 of 23
2013-10-30 13:09:00
Originally Posted by 5speed

It's the same thing. An efficient engine is fuel efficient. That's the defintion of a efficent engine.

I haven't read the whole thread but all you need to look at is:

BSFC (Brake Specific Fuel Consumption) = fuel consume/ power

Brake specific fuel consumption - Wikipedia, the free encyclopedia

What I'm saying is, I would love for you to get even 15mpg always WOTing your car around town, even if you keep a steady 14.7:1 AFR at WOT. Reason it will still be bad even with lean AFR is, you still increase the amount of fuel as load (air) increases. If you keep the fueling constant what might be 14.7 AFR at -22 inHg, will be closer to 18-20 AFR at -5 inHg.

You basically have to find a compromise between load and fuel consumption.
2013-10-30 13:50:32
Use BMEP to compare various engine types.

Can't delete that one because it is on-topic, bwwooooommmm.

Or maybe your spark value is altered so much you have not found the MBT for your engine/s /slash/ setups /and/or changing stuff often.

Now I will remain silent so no more posts are deleted in your thread, @Vadim one for being off-topic when this topic can be delved into rather easily by reading a book.

What 5 speed said was great about BSFC (thanks buddy!), and the units are pounds per HP-hour I think IIRC.
Last edited by Kyle on 2013-10-30 at 13-54-19.
2013-10-30 13:58:30
@Kyle that's a little better.

I'm still shocked that with this specific setup less timing is yielding better results, that's contrary to the popular belief on this forum and pretty much any other forum. I've always seen people refer to increasing timing, helps increase torque, thus you don't have to throttle in as much to fight the wind resistance.

Next time I feel like taking a long trip on the DET B15 I'll try a similar dumbed down timing map, if it's anything like @unijabnx2000, might see decent results!
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