Ideal AFR also depends on RPM and injection window.
For example, in my current tune, .234 inj w 11mm pump calibrated pump voltage to 80 mg/s and smokemap used to limit fuel (not torque limiter like some tunes do above 851 mg/s maf)
RPM AFRsmokefree
5500 18.8
5000 18.65
4500 18.5
4000 18.2
3500 17.9
3000 17.6
2500 17.2
2000 17.1
BUT what I am seeking now is what is the best AFR to set the target boost map, for cruising conditions, aka 10 mg/s 20 mg/s 30 mg/s?
I currently use reduced boost from stock boost map based on advice from ecuconnections, but I hear that higher afr than 17 is more economical to a point, due to better mixing etc...??? (tdimeister- is there an optimal part load afr- or is "enough air" better???)
assuming 1 bar absolute is around 480 mg/s maf (when EMP is not too high)
IQ AFR BOOST@2k BOOST@5.5k
10 48 1000 1092
20 28 1167 1274
30 24 1500 1638
37.5 22 1718 1876
45 21 1968 2150
Higher fueling goes closer to the afr from smoke map due to boost limits of the turbo itself (1749vb-vnt17)
Funny to see this thread come back. I barely even recall what I was doing with my wagon when I started it in '08.
Last time Jeff tuned my car he told me the timing was too advance (100 in block 2). In the past he liked it set high to make sure the pump had its full timing advancement available. I've moved it back to 75 or so, and based on the low smoke and FE I'm getting I guess it was a good idea.
I don't know why the change in opinion.... setting static to 100 only makes it so that the pump can't go below xx BTDC. 75 for example, you see you get 3 btdc at idle irrespective of timing duty cycle. More timing than that is done by the SOI map, which adapts to whatever static you set it to. (example: asks for 10 btdc@ 3000 rpm: with timing at 75, the solenoid would be 60%, but with 100, it would be 30% - example!)
Anyway, with 75, run output tests, the first one does the timing solenoid. Then go to group 04 measuring blocks and see how even at 75, you can get up to 22 or so BDTC at idle! If you rev it to 1200 rpm or so (not too high or it stops the output test) you see it goes to 25 or so!
So this original advice of 100, is kind of overkill in the first place. Maybe it was a fix for the pumps that couldn't get proper case pressure or feed of fuel?