mfr122887

iTrader: (14)

I have searched and could not find a definite answer to this question. Does scaling the MAF change 2-Byte load values? If so, would decreasing the scaling, increase the load?

mfr122887

iTrader: (14)

Anyone?

l2r99gst

iTrader: (2)

Yes, load is a mass airflow. The MAF scaling is a scaling for L/Hz per Hz. So, adjusting the MAF scaling higher is basically saying that you have more Liters of air per Hz of Maf reading. So, given the same temp and pressure (baro), your load should increase.

mfr122887

iTrader: (14)

My current MAF scaling is reduced by 14% from 100 - 1600. I am hitting 300 load at 3500 RPMs @ 25 psi on a 20g-9-5. Does this sound right? Should I set the high load areas on the MAF scaling (500 and above) back to stock and just smooth the values to make the curve look good? Any feedback would be welcome, Thanks

l2r99gst

iTrader: (2)

It sounds about right to me. Let me look up one of my threads where I estimate boost from load and plug in your numbers to see how it looks.


Edit:

Just running some quick numbers in the equation, I get:

BoostEst=[(load*T)/(P*VE*280)]-14.7
T = actual intake air temp (not MAF temp) in degrees Rankin (degrees F +460)
P = atmospheric pressure in psi at the MAF(baro)
VE = VE of engine at the RPM being measured


https://www.evolutionm.net/forums/sh...d.php?t=307894

(300*520/14.7/.90/280)-14.7=27 psi

I used an intake temp of 60F (not sure what your temps are like where you live now or if the loads are at night, etc
I used a VE of 90% at 3500 RPM

The quick approximation comes pretty close, so I would say it sounds about right.

Changing just the VE to 95% makes the boost estimate right at 25 psi. I know our engines/setups for this equation are right at 100% around 5k or so, so 95% at 3500 may be reasonable with your setup. Either way, I think this shows you are about right.