fri. night i had my car dyno tuned at the local shop. We played with the vafc for about an hour and we found out the my best X-over point was 5200 and now I am putting down 160,118 w/ b18c1-sk man, ctr cams, int, exhs,. And that was the good news. When it came down to changing the fuel incraments around it just seems like NOTHING happened... from what i've seen before the older version seemed pretty sensitive to the adjustment of incrament through the wide band.. which would budge from high 14'a across all night. I already checked the wiring diagram 3thrice, so i was wondering if there might be a recall or just somthing im not getting to...

 

bump

 

help a TUNA!

 

to top!

 

2 the top

 

tippy top

 

Were you trying to add fuel?

 

i really doubt it's the unit's fault.

 

20+ on wide and narrow throttle and no changes....still clueless

 

What I believe is happening is that pressure columns above atmospheric don't have significant amounts of additional inj pulsewidth, so no matter how much extra MAP voltage you add, it won't enrichen it any further.

Use an OBD-2 scanner with real-time sensor reading to check inj pulsewidth as a function of VAFC positive correction while making full throttle passes on the dyno. That will either confirm or disprove my theory.

PM me if you want, since I'm leaving out a huge hole in the explanation that you might or might not be familiar with.