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j12piprius · 09-10-2014, 12:19 AM

I've been using % engine load, and tried MAP today for comparison. According to the Ultragauge manual, MAP goes up to 255 kPa (kilopascals). Based on that, I figured 90% engine load would be about 230 kPa, but that isn't the case.

When % engine load got up to 90%, the kPa's were only approaching 100!
Interestingly, standard atmospheric pressure on Earth is defined as 101.325 kPa.

Does MAP have a direct relation to fuel use, i.e. up to 100 is efficient, and above 100 is excessive? Therefore 101 to 255 MAP is relative to 93 to 100% engine load?

If so, I think that's quite neat.

09-10-2014, 12:19 AM	#1 (permalink)
j12piprius Liberty Lover Join Date: Feb 2011 Location: central california Posts: 587 pris prius - '12 Toyota plug in prius 90 day: 71.09 mpg (US) Thanks: 439 Thanked 83 Times in 60 Posts	how does the MAP readout work? I've been using % engine load, and tried MAP today for comparison. According to the Ultragauge manual, MAP goes up to 255 kPa (kilopascals). Based on that, I figured 90% engine load would be about 230 kPa, but that isn't the case. When % engine load got up to 90%, the kPa's were only approaching 100! Interestingly, standard atmospheric pressure on Earth is defined as 101.325 kPa. Does MAP have a direct relation to fuel use, i.e. up to 100 is efficient, and above 100 is excessive? Therefore 101 to 255 MAP is relative to 93 to 100% engine load? If so, I think that's quite neat.