I don't have numbers any more.  That was long ago in a different life, but they're available - probably from Ed :o)  Just looking at my take off performance between 70 F and 90 F, I'd guess that your 88% isn't far off.  But then again, I've already told you more than I know :o)  If it flies, get it up to 2000' or so overhead the air patch and pour the coals to it.  Give it 18" - 20" of boost and see how it climbs.
See you at Tracy's ... Jim S.

Russell Duffy wrote:

 

Charge-air temps are EVERYTHING.  The flying rotary turbo guy should measure his. As you might imagine, 30-inches of MAP at 80F degrees is not at all the same thing as 30-inches of MAP at 140-150F degrees.  That's a pretty typical output temp for a well-matched turbo.  So yes, intercooling is a MUST.

Speaking of temps, I meant to ask about the calculations.  What would be the theoretical loss of available power between 30" MAP at 90F, and 30" MAP at 167F?  I attempted to calculate this, and came up with only having 88% power at 167F compared to 90F.  I'm only about .0348% confident in this calculation though.  It sounds like Finn is seeing a much larger difference, and I've always been able to feel the diff in cars between hot and cold days.  To feel the diff in a car would seem to suggest quite a bit of power to me. Thanks,Rusty

--
Jim Sower
Crossville, TN; Chapter 5
Long-EZ N83RT, Velocity N4095T