ModularTurbo

iTrader: (14)

1st find cfm unboosted (CFMU):

(C.I.D/1728) X (maxRPM/2)= CFMU

2nd find Pressure Ratio (Pr):

(14.7+Desired boost) / 14.7=Pr

3rd find CFM boosted (CFMB):

CFMU X Pr= CFMB

4th convert CFMB to LB/min:

CFMB X .07= (required LB/min)

5th look at the comp map and use your required LB/min and Pr to place yourself on the map, trying to be in the lower right hand corner of the efficiency islands.

I hope this helps,
Rob@modularturbo

MIGHTYMOUSE

iTrader: (59)

nobody has a desired boost, how about work it out with desired horsepower. then pick the smallest turbo you land in the sweet spot on.

ModularTurbo

iTrader: (14)

Thats a good idea LOL

OK lets inverse some things

Desired HP / 10 = required lb/min

then solve for CFMU using required lb/min like this:

lb/min / Pr = CFMU
.07

1728 X CFMU = CID
(maxRPM X 2)

topend

1728 to convert to cubic feet not 1726.

ModularTurbo

iTrader: (14)

Thank you
Updated

Josh@KY-Turbo

iTrader: (120)

Put the biggest turbo you can fit. Use C02 to hold the WG shut to get it to spool. Hope like hell the engine enjoys your decision.

Sorry. I had too.

HUNTER02SS

iTrader: (24)

LOl, this is the same philosophy I use!

87silverbullet

iTrader: (11)

^^^ I like that one. It simple and 50% effective. Just hope you're on the better side of the 50 %

ModularTurbo

iTrader: (14)

^
or just do that