Pressure Ratio/Exhaust Pressure
04-13-2016, 09:55 PM
#1
Pro
Thread Starter
Pressure Ratio/Exhaust Pressure
I'm trying to get an estimate for typical exhaust pressures in our cars. Does anybody have some data (and are willing to share) on exhaust pressure ratios vs rpm or anything similar?
I'm working on a closed loop (pid) arduino boost controller and I'm working out the math on the wastegate model. So far that's the only number I'm falling short with. Everything else I was able to measure on the bench.
I'm working on a closed loop (pid) arduino boost controller and I'm working out the math on the wastegate model. So far that's the only number I'm falling short with. Everything else I was able to measure on the bench.
04-14-2016, 12:12 PM
#2
Three Wheelin'
I don't know if this helps, but the factory manual has a test procedure for exhaust pressure which states:
Maybe that's a good starting point?
"At full load with engine speed of 3500rpm and approx 0.7 bar charging pressure [meaning boost], exhaust pressure should be 0.8 +/- 0.1 bar"