mfc
10/04/2016, 16:21
Bonjour à tous
I think that can be useful to compare the efficiencies of different intercooler types by measuring the quantity of air which enter in the cylinder on every stroke instead of comparing directly the flux in g/s measured by the MAF.
To do this type of measurement:
Using the OBD2 interface, record at least the PIDs 0x0C (RPM) and 0x10 (MAF)
And then use the following formula
For any 4 stroke 4 cylinders engine: mass of air in the cylinder (g)=MAF (g/s)*30000/RPM
For example, with 155.11g/s and 4900RPM, I get about 950g
If you record from the OBD2 interface the PID 0x34 (lambda sensor), you can even calculate the quantity of the fuel injected into the cylinder.
For the comparison can be useful to record the intake air temperature (PID 0x0F) and the boost pressure (PID 0x0B)
Anyone that want to participate, posting tabular or plotted data and some info about the car setup, is welcome!
Best Regards
Marco
I think that can be useful to compare the efficiencies of different intercooler types by measuring the quantity of air which enter in the cylinder on every stroke instead of comparing directly the flux in g/s measured by the MAF.
To do this type of measurement:
Using the OBD2 interface, record at least the PIDs 0x0C (RPM) and 0x10 (MAF)
And then use the following formula
For any 4 stroke 4 cylinders engine: mass of air in the cylinder (g)=MAF (g/s)*30000/RPM
For example, with 155.11g/s and 4900RPM, I get about 950g
If you record from the OBD2 interface the PID 0x34 (lambda sensor), you can even calculate the quantity of the fuel injected into the cylinder.
For the comparison can be useful to record the intake air temperature (PID 0x0F) and the boost pressure (PID 0x0B)
Anyone that want to participate, posting tabular or plotted data and some info about the car setup, is welcome!
Best Regards
Marco