SSDD wrote:Hi all can someone tell me what the equivalent of your US:
is in Europe, we have here:
QldRobbo wrote:I must be missing something....
I'm assuming that 20kpa at 800rpm would be able idle, using the formulas above I get 31 degrees of advance at idle.... shouldn't this be more like 10 degrees?
DJ Kill wrote:
Why is maximum advance for further timing calculations (for boosted or NA engines) is assumed to be reached at 3000 rpm and not at higher rpm?
Werner, the statement at the bottom of the pic says the greatest advance at highest load, but unless I'm reading it wrong (lowest pressure and rpm 'idle' at top left and highest pressure about 100kpa at bottom center), it shows the greatest advance at light load where cruise would be. The map in general appears okay but the statement appears wrong - no?woh wrote:...Have a look at this ignition map. It comes from the Jeff Hartman book, Fuel Injection installation, performance tuning, modifications. I modeled this map for my car...
snillet wrote:And i tried the XLS spreadsheet "just for the fun of it" and thought the advance figures at low rpms, especially around idle became VERY weird...
The idle advance figure ended up at the 100kpa bin, now that can´t be right ?
if i put in 8 degrees idle advance i get 29degrees advance at 30kpa/800rpm , that´s a bit rough on a standard engine i think
Although it follows the general "guideline" of advancing the timing at lower loads i don´t think that way of doing it would work to well every time, you need to scale it up so the lower left corner on the "MT" screen becomes low for the idle to work nicely. On most cars anyhow.