George,

 

Mazfix and Mazsport are both boosting to 280hp at the wheels. http://mazfix.com.au/perfproducts/rx8_upgrades.html.  Pettit Racing is seeing 270+ with 5-8#'s  http://www.pettitracing.com/rx8/index.htm  My goal has always been to match the IO540 at 8000ft and have a much lighter plane with new engine. No doubt I will be giving up some HP without the intercooler. One percent for every 10 degrees I think. If my cooling ducts and exit area work as planned I may add an intercooler. The goal now is to get the engine started and flying by summer.

 

 

Bobby

RV10