is there a timing issue with 91 octane in this graph? apr stock,91 and 100 octane programs
02-20-2004, 06:10 PM
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is there a timing issue with 91 octane in this graph? apr stock,91 and 100 octane programs
<center><img src="http://pictureposter.audiworld.com/20356/timing.jpg"></center><p>
02-20-2004, 07:15 PM
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Especially the ordinate (you hinted at the abscissa)...
...and to the extent that the stock timing is in some ways between the other two, it makes sense (this will be more obvious if you run a 2-point smoother through all three datasets). But I don't know why the differences would be so great at the different engine speeds. Maybe the assumption is that using 100 octane will be accompanied by high rpms for racing so that's where it's optimized. HPH
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02-21-2004, 03:03 PM
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you got it back, i noticed that i got the 100 octane graph off a bit rpm wise. the u shape dip in
both the 91 and 100 octane graphs i think is where the cams change timing and they should line up at the same rpms