1) Load info is given on the maps by the TP value on the X-axis. On the Labjack, you monitor and datalog Load using the MAF connection.
From the ZEM Hardware Installation Guide : The (+) MAS line needs to connect into AI0 port, top left of the Labjack.
The (-)ground MAS line needs to connect into the GND port, 3rd port down on upper left.
2) From my experience, you will max out the stock TP scale at around 10psi with 370cc injectors (Ash claims 15 psi with 555's). It's because your map is based on the stock scale. Above max TP, ignition timing will stick to its max value on the right of the line (for a given RPM) and AFR (enrichment) *should* remain the same if your fuel system is linear.
You can extend the scale (ie re-scale) the TP axis but you will loose precision on other values below. Remind that our ECU manages 16x16 maps : a map is an array of 16 TP values x 16 RPM values.
3) Numbers in fuel maps are the enrichment ratios from 14.7 AFR.
From the ZEM User Manual :
Additionally the values in the maps specify the enrichment or enleanment in percentages, which makes it easy for us to understand. As an example, say a cellblock in the fuel map that corresponds to 5500RPM with a TP value of 62 specifies a value of 30. This means “add 30% more fuel from 14.7:1” so then the ratio is modified to produce an 11.3:1 A/F ratio for that given engine condition. To calculate the air/fuel ratio from 14.7:1 with 30% more fuel, it is simply 14.7 parts of air to 1.30 parts of fuel, or 30% more fuel. Dividing 14.7 by 1.3 gives you a ratio of 11.3:1. So, a value of “0” in a cellblock means to run 0% enrichment, which makes the mixture 14.7:1. Additionally, a value of –7 would mean 14.7:0.93, or 15.8:1 A/F.
If you need the EZM user manual, I can e-mail it to you.
Hope this helps.
|
