2 Attachment(s)
Ambient Air Density and Manifold Air Density like Bank IDash
After reading about Bank IDash 1.8 and watching some youtube videos on how the Boost gauge is dead, I have had a play around with some User Maths parameters for VCM Scanner and I've had some success so I thought I'd share for anyone else interested.
Reading Manifold Air Density (MAD) is far superior reading compared to manifold pressure or a boost gauge as it references a standard day.
[15.5degC, 0% humidity, 101.32kpa baro]
Here is some further reading:
https://www.dieselarmy.com/engine-te...d-about-boost/
Why the boost gauge is dead - Youtube
Now since we don't have a humidity sensor we can't get an accurate reading of the air density so all comparisons are with humidity of 0%.
Attachment 86848
This is a screen shot from my ute. You can can & paste these formulas into User Maths Parameters.
On the bottom chart is:
AAD - Ambient Air Density
100*((([50032.91]*1000)/(287.05*([50008.241]+273.15)))/16.02*1000)/76.4
MAD - Manifold Air Density
100*((([50030.91]*1000)/(287.05*([50011.241]+273.15)))/16.02*1000)/76.4
BAD - Boost Air Density
(100*((([50030.91]*1000)/(287.05*([50011.241]+273.15)))/16.02*1000)/76.4)-(100*((([50032.91]*1000)/(287.05*([50008.241]+273.15)))/16.02*1000)/76.4)
Attachment 86849
This is an example so you get the idea....
Its very interesting to observe whats happening in relation to Intake Air Temperature and the days barometric pressure.
You would think because intake manifold pressure is 198kpa and boost is 14.2psi that I would have approx double the amount of air going into the engine.
But when you take into consideration that the days ambient pressure is only 94% and the high intake temps (51C) that I'm only getting 80% increase in cylinder volume! Now if I had a decent water/air intercooler and I could get the air temps down to 9c then the MAD would be 200%!!!
