Hey all.
Been a while, i know, but ive been lurking and looking.
I have an alfa 147 these days and its mental. its a 1600cc with a few added bits from the 2L engine that help it breathe.
BUT....
I'd like to run a light pressure turbo on it. Circa 5psi. Not a lot i know, but without getting into spacers/pistons and standalone ecu etc it will add a few ponies.
So i bought a book to try and learn what i need to work out and get some figures made into metal.
I have, however been over thinking it a bit and confused the crap out of myself....
Figures:
VFR:
1598cc (97.5cu/in)
97.5cu" x 7500rpm x 90% (volumetric efficiency) / 3456 = 190.4 cubic feet per minute needed.
I'm looking for 5psi, so Pressure ratio = 5psi+14.7 (sap) =19.7 / 14.7 = 1.34 PR (stop laughing...!)
Thats 190.4 cu/ft into lbs/min (/13.7) gives me 13.89 lbs/min.
I cant find a map that i've landed anywhere useful....