ponjohn

Which turbo would you choose. Parameters used are:twins, 6 liter, 650 crank hp, 6000 rpm, 12 psi.

Sorry couldn't get the pictures to direct link to Picasa.

kbracing96

iTrader: (25)

Your Plots are all incorrect. 12psi is 1.8 PR (12/14.7=.81PR+1(for NA)= 1.81). I like to run turbo's a little on the small side, so it comes up right in the meat of the turbos efficiency range and then runs off the end at the shift. This gives the best spool and under the curve power band.

ponjohn

Those plots took into account a 1.7lb pressure loss across the intercooler.
This figure was in the calculator, not knowing what is a reasonable loss, I left it alone.

So in actuality the pressure at the turbo 13.7.

Thanks.