Dave Anders is a friend of mine and he owns the fasted RV4 in the world.
The first two pages here discus BSFC and other performance factors at length.

His RV4 is highly and extensively modified. He added
a turtle deck behind the canopy to improve the streamlining. He had to beef
up the tail vertical as it started to flutter over roughly 230 MPH. When Dave Leonard
practiced at Reno in 2011 with the Mazda turbo 13B at 230 MPH Dave Anders came over and
warned us about the tail problem. Anders also did detail work on the
Lycoming plenum to improve the cooling. The engine was souped up by Lycon.
My guess is it has  close to 300 HP. Anders used  Klaus LSE ignition system. Klaus
is just opposite the taxi way and John Lynch is a few hangars down so Anders
shows up at SZP from time to time.

Dave Leonard could easily get 300 HP out of the turbo 13B by simply disconnected the
waste gate from the limiting diaphragm and installing a manual waste gate. That
is what we did on the time to climb engine and we are getting  650 HP running on Methanol.
The manual waste gate was the best thing we did when it came to tuning the Motec.

We have at least 3 hours of running with a lot of it at full power. We are going
to fly it at SZP soon. It is now running perfectly but we have a small leak in one
of the injector hoses. When that is fixed this week it is ready to go for the
record.

Paul Lamar

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