First dyno visit since I bought HPTuners
03-26-2005, 11:49 PM
#1
First dyno visit since I bought HPTuners Mixed reactions. I was hoping the AFR would be more level as a result of all the SD tuning I did, and it read leaner than on the street (expected). So can I base any street AFR tuning off these dyno pulls, or do I need to risk sitting the night in jail to get a 4th gear WOT pull to 7000RPM? I had my PE multipler set to request 12.6 until 4800, then gradually lean out to 13:1 at 6800.
http://www.musclecarsoforlando.100me...MSCC/JMZ28.jpg
http://www.musclecarsoforlando.100me...MSCC/JMZ28.jpg
03-27-2005, 12:09 PM
#2
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Looks to me like your constant PE results in a fading
rate (to be expected with the head-end regulated
fuel system). You could derive a correction profile
from the commanded vs actual profile there, though
it appears that the way you're trying to taper it is
how it normally wants to roll off anyway - so maybe
a flat profile would (by luck or by construction) give
you what you want.
Similarly if you have already seen the street vs dyno
mixture scale then you could apply that as a correction?
Or if you have seen that (say) 4th mixture = 0.96*3rd
and 0.91*2nd you can try some predictive PE adjustment
based on whatever compromise you think is best (4th
gear anti-ping vs 3rd gear performance etc.).
rate (to be expected with the head-end regulated
fuel system). You could derive a correction profile
from the commanded vs actual profile there, though
it appears that the way you're trying to taper it is
how it normally wants to roll off anyway - so maybe
a flat profile would (by luck or by construction) give
you what you want.
Similarly if you have already seen the street vs dyno
mixture scale then you could apply that as a correction?
Or if you have seen that (say) 4th mixture = 0.96*3rd
and 0.91*2nd you can try some predictive PE adjustment
based on whatever compromise you think is best (4th
gear anti-ping vs 3rd gear performance etc.).