openecu.org

Having read alot on this forum there is one thing I can't get my head round and that is the engine load in grams . I have been mapping my classic scoob with a MoTeC ecu in it for about 3 yrs now, through various engine stages and the load is the actual boost pressure in the manifold . How does the engine load in grams compare to boost ? Sorry if it has been answered before but I couldn't find anything with the search.
Cheers Dave

If load units are supposed to be g/rev, then:
=(MAF*60)/RPM

If load units are supposed to be g/cyl, then:
=(MAF*60)/RPM/2

I read that when I did a search but how does the grams relate to psi of boost? this is what I can't get my head round

There is a correlation, but you cannot just multiply boost by a number and come up with load, or vice versa.

Dave Harries wrote:I read that when I did a search but how does the grams relate to psi of boost? this is what I can't get my head round

There is a numeric relationship, but you also need manifold air temperature, volumetric efficiency and cylinder displacement to perform the calculation. I suspect the MoTeC needs to perform that calculation in order to determine how much fuel to supply.

my first post in this forum...

I'm somewhat familiar with tuning using Unichip so I am trying to channel my experience into ECUflash. Functions like fuel accel is absent (proly under a different term) and ignition timing and AFR is changd with respect to rpm vs throttle position.

In ECUflash, fuel trims and ignition timing maps are represented by rpm and engine load in grams. I've tried to change the x-axis values to "Throttle" but it screws up the figures royally.

I don't mind working with load if I could get a better understanding. So I take it that 4.28 g is the maximum engine load that a WRX will ever encounter?