Quote:
Originally Posted by ever_green
Overview
For a naturally aspirate engine this means that you basically cannot exceed ~2900 RPM at sea level if you want to stay in oversquare engine operation. This is because at sea level atmospheric pressure is roughly 29 in-hg and 2900RPM/100 = 29. So for my driving I set 2900 RPM as my redline, but to keep the limits softer and add room for error i usually set 2500-2700 as the limit. I have also programmed MAP in in-hg for my scangauge to ensure i'm always operating in an "over square" fashion.
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I'm curious how oversquare applys to Dfco and Eonc, vs DWL, which it sounds like is the main application.
I've been using abs kPa on the Ultragauge, which as far as I can tell doesn't have a reading for inHg. Standard atmosphere is 101.3 kPa, 29.92 inHg and 14.696 psi. The following would be relative to using kPa readings, i.e. 10 MAP ~ 300 rpm.
100 > 2992 rpm
90 > 2700 rpm
80 > 2400 rpm
70 > 2100 rpm
60 > 1800 rpm
What about accelerating, when MAP can be considerably higher relative to rpm, for example 1500 to 1800 rpm and 27 Hg ( 90 kPa ); is that acceptable or should MAP trend towards the 100:1 ratio?