Originally Posted by howard coleman

here's the only compressor map on the twins that i have found. as you can see it is incomplete as to scale.

we can back into the X scale.... it takes 1.92 cubic feet of air to produce one rotary rear wheel hp. let's assume that the motor is making 385. two turbos so 385/2= 193 rwhp per turbo.
193 X 1.92= 371 CFM/14.471= 25.6 lbs/minute. that sounds about right to me re total air delivery on the X scale.



as far as porting...

the relationship between the exhaust and intake ports can have a major effect on the point at which a compressor cavitates. the amount of overlap can effect the output side force against the compressor.

when considering ports on a rotary there really is alot of confusion.. if you really want to understand what's going on you should study piston engine valve timing/camshaft dynamics.

that all said, messing w the stock turbosystem is putting lipstick on a pig. lots of EBP will cause high egts and kaboom. throw some AI at it please.

hc