Ok. Need help with this.
What is the VE of 103 engine?
Got it. Or at least I got close enough.
What is the VE of 103 engine?
Got it. Or at least I got close enough.
Last edited:
Volumetric efficiency
- Thread starter buckshot85
- Start date
I don't think you can really just ask for a standard ve value. My pv maps and fp3 maps show a ve ranging anywhere from 93 to 110%, depending on rpm and throttle. It is very dependant on the setup as I understand it.
I urge anyone to correct me if I'm working (because I'm good at being wrong) but ve is essentially the computation of how much air is injected in the cylinders versus their displacement, and is used to compute and achieve the desire afr. Flow characteristics of the intake and exhaust (as a whole) will affect ve to valve timing, durations and lift.
Sent from my Droid Turbo 2 using Tapatalk.
I urge anyone to correct me if I'm working (because I'm good at being wrong) but ve is essentially the computation of how much air is injected in the cylinders versus their displacement, and is used to compute and achieve the desire afr. Flow characteristics of the intake and exhaust (as a whole) will affect ve to valve timing, durations and lift.
Sent from my Droid Turbo 2 using Tapatalk.
A sensor in the intake manifold (after the throttle) measures air temperature and manifold absolute pressure. From this information, the density of the incoming air is calculated. Knowing the RPM and displacement of the engine, the ECM calculates how much air the engine would pump at 100% Volumetric Efficiency (VE), considering the density calculated earlier. The VE is never exactly 100%, so it is corrected by stored values (percent efficiencies) in a VE look-up table. Now the amount of air in the cylinder is known and the ECM commands the fuel injector to spray just the right amount of fuel as indicated in the fuel table (Air/Fuel ratio).
It is critical that the VE table be correct for proper fueling, especially during periods when the bike is running open loop and not using the O2 sensors. Open loop happens pretty much any time you are accelerating. Steady-state cruise conditions will be closed loop.
It is critical that the VE table be correct for proper fueling, especially during periods when the bike is running open loop and not using the O2 sensors. Open loop happens pretty much any time you are accelerating. Steady-state cruise conditions will be closed loop.
