>     David Leonard wrote:
     >
     >      >
     >      > It is flying well.  The new cold air intake is allowing me to
     >     cool about
     >      > 31-32" in level flight even on the very hot days we have had
     >     lately.  My
     >      > limit now is mostly the compressor surge that I keep
     >     getting.  35" at SL
     >      > or about 27" at 12K is where I run into it.  So right now my
     >     cooling and
     >      > available power pretty much match.  But in winter the
    limit will
     >     be the
     >      > surge.
     >      >
     >      > TAS is about 180kts at altitude, can indicate 150 kts down
    low.
     > Have
     >      > not played with it much.
     >      >
     >      > EGT is same as it ever was, around 900C.  I have a new
    ceramic
     >     coating
     >      > on the exhaust pipe to help with oxidation and radiant heat.
     > Cruise
     >      > RPMs are about 5700.
     >      >     > --
     >      > Dave Leonard
     >      > Turbo Rotary RV-6 N4VY
     >      > http://members.aol.com/_ht_a/rotaryroster/index.html
     >      > http://members.aol.com/_ht_a/vp4skydoc/index.html
    <http://members.aol.com/_ht_a/vp4skydoc/index.html>


    Dave,

    What turbo and compressor wheel are you using?

    Monty


The compressor is a TO4 60-1.   The map is attached.  At first glance it
appears to be a good match.  But if my intake efficiency is low, then it
is easy to see how I could be bumping up against the surge line.