AFR calculations boost based

by **nagliy_root** » Sun Jun 09, 2013 3:58 pm

Hi, calculating right AFR in smoke limiter map based on MAF is not complex thing. It easy. But how calculate right AFR then smoke limiter is boost based (based on MAP)?

by **alex_sk** » Sun Jun 09, 2013 10:56 pm

Multiple cylinder volume, air density and boost.

by **marco** » Sun Jun 09, 2013 11:40 pm

can you make a simple example on finding out this ?

by **alex_sk** » Mon Jun 10, 2013 10:43 am

Easy :)
Engine for example 2.0l - 1 cylinder 500 cm3.
Air temperature 70C - air density 1.03 kg/m3 = 1.03 mg/cm3
Without boost max air mass in cylinder 515 mg (70C)
In reality you must add dependence from RPM (not full gas exchange in cylinder)
Boost 1.5 atmosphere mean air mass 1.5 time more then 1 atmosphere (1 atm coarse equal 1 kg/cm3).
515*1.5=772.5 mg
AFR=17
max IQ=772.5/17=45.4 mg (boost 1.5 kg/cm3)