Reading Rovergauge

[Franky boy]

Hi all,

Just a quick question re rovergauge. I'm trying to understand a little more about mapping.

I've done lots of reading and looked at AFR, VE and ignition tables.

What does the table in rover gauge show as it doesn't seem to look like any of the above as far as content is concerned, the RPM is obvious what does the other axis represent and what does for example does 5A indicate.

Many thanks

Frank

[blitzracing]

The vertical axis is engine load based on airflow reading from the AFM, so the map point will always travel down diagonally to the right as the RPM increases under throttle and the airflow increases. The numbers in the cells are hexadecimal, as its based on a binary computer, where you count from 0 to 15 instead of 0 to 9 as you do in decimal. As you cant have 10 as a hexadecimal number it becomes A to F as you get above 9. Easiest thing to do is use a hex to decimal converter off the web if you cant think in hex. So 0 to FF in hex works out as 0 to 255 in decimal, which is the number of fuel steps you have from no fuel, to maximum at 255. This number basically controls the injector opening time.

[Beverley Grove]

So the AFM is the primary input for engine load? How does the ECU use the throttle pot input?
Just curious.

[Franky boy]

Thanks Mark

[blitzracing]

Beverley Grove said:

So the AFM is the primary input for engine load? How does the ECU use the throttle pot input?
Just curious.

The throttle pot is only there to show the throttle is shut / open for idle control and if it changes value rapidly as you floor the throttle the ECU is programmed to add fuel enrichment, nothing more.

[davep]

blitzracing said:

The throttle pot is only there to show the throttle is shut / open for idle control and if it changes value rapidly as you floor the throttle the ECU is programmed to add fuel enrichment, nothing more.

Also shuts the injectors down during deceleration depending on rate of lift-off, plus it provides a control parameter for other processes, idle and short term trim for example.

Edited by davep on Saturday 27th June 11:51