MAP / temp F /
RPM
18” / 105 /
3000
20” / 128 /
4225
30” / 167 /
5000
36” / 196 /
5500
40” / 214 /
5700
44” / 228 /
5800
It appears that at my 36" MAP boost level, I have the
same air density that I would have at NA, on the same 90F ambient
day.
Unfortunately, this air density
is only part of the problem. I'm guessing that
exhaust backpressure is as much, if not more of an issue. This
leaves me still thinking that I'll need 5-6 psi of boost to break even with
a good NA engine, but I'm becoming more comfortable with those
figures.
Rusty (off to the hanger to see if I
can find a place for Mr. intercooler)