Bri Bro

What are the PR and Lbs/min used for a 951 when looking at the Compressor chart for Turbonetics?

Using a spreedsheet developed by J.D. Estill I get:
Data for use with Turbonetics curves
pressure correction 0.983
temperature correction 0.991
corrected suction flow 33.3 lb/min
Pressure ratio 2.26

(2.5 liter,1 bar boost @6000 RPM)

BTW,how do you attach an Excel file to a message?

Bri Bro

I have seen numbers around .63 to 1.06 for Area/Radius (AR) for what I want. I need the PR and Lb's/min for the Compressor charts.

Dave Sims

PR 2.02

lb/min 33.72

6000rpm @15psi

David
<a href="http://www.944turbo.org.uk" target="_blank">http://www.944turbo.org.uk</a>

Bri Bro

These are the type of number I calculated using the standard PR and CFM formula.

What J.D. Estill was accounting for in his formula was the intercooler losses (1.3psia) which is added to the numerator and Vacuum drawn at inlet of 2 in Hg (.99psia from air filter/pipe loses) that is subtracted from the demoninator. This drives up the PR ration which can rule out certain compressor maps...run into the surge limit (assuming PR is reached at around 3,000RPM). Is this valid?