Hi,

can one of you validate if the formula is correct (screenshot attached)

Going from MAF g/s (vcds measurement) to Mass Air (where to look in the smoke map for doing changes).

Formula used:

vcds measurement = g/s
Milligrams = 1000 x g
Seconds to Stroke = (RPM/60) * 2 (2 strokes per RPM)
Excel formula = (1000 x g) / (( RPM /60)*2)

Does it make sense that when using cruise control at around 110 km/h (2150 rpm), it uses around 600-700 mg air/cylinder?
Looking at full throttle in 6th gear (KPa 255 -> 2,55 -> 1,55 bar turbo pressure) it says around 1200 mg air.

Mistakes? comments?


/Wicca

Found out it was my VCDS log when driving against the wind (10 m/s windforce).
When the wind is in the back or wind is still, its between 350-600 MAF at this speed (floating depends on hills up and downs)

700 MAF I found pretty high for cruising, but it now makes sense :-)

Tried to modify the AFR in the cruising area, will see tomorrow how it behaves...


/Wicca