airflow chart

THE PRESIDENT · see above

airflow chart

Viet · POOP Bum

very nice! what was that formula that you used to get that? I thought there were other numbers that were had to be guestimated unless you knew what they were.

so have you compared any compressor maps yet? which turbo seems to fit the best on the 1.8t?

THE PRESIDENT · see above

what i used for that was

Pressure ratio (PR) = (14.7+boost)/14.7

and CFM = (Liters*RPM*VE*PR)/5660

i asummed the volumetric efficiency to be 90% , that was generally the estimate for 4valves/cylender, and i have 5 so it can only be better

and cfm/14.27 =lbs/min

here's the same thing in lbs/min, since a lot of maps are in that

A4seen Racer · VP

that is very nice indeed. very useful

where did you get the formula from? the maximum boost has a 1/2 in there to half the rpm cause of the one exhaust stroke per 2 revolutions

THE PRESIDENT · see above

i guess that must have been factored into the equation already, because the numbers seem to be in the right ballpark.