z28onspray

I scanned the car and it was in the 923mv range from 4000 to 6800 so i tried to bring that down from PE.. I subtracted .01 from the EQ ratio vs RPM and I scanned again.. The car was in the 930mv range.. i just put the old tune in fearing i was doing something wrong ..
Can anyone help me with this?

Thanks..

foff667

iTrader: (2)

http://www.hptuners.com/forum/showth...9805#post69805

z28onspray

Thanks

i have my wideband sitting in the car waiting install next weekend..
i didn't read about wideband do i use PE EQratio vs rpm to do the tune???

thanks ..

foff667

iTrader: (2)

PE eq ratio is your commanded a/f ratio...you can tune only with that but then your just fudging...usually I'll use a combination of that, ve & maf to get everything to match up correctly.

jimmyblue

iTrader: (11)

If your commanded AFR is your actual AFR then you
just have to change PE vs RPM (but look at EQ Ratio
vs MAP to make sure it isn't taking over, if you are
reducing PE by a lot). Fat kid wins.

If your commanded and actual disagree then you have
to look at air and fuel delivery models and figure out
where the error(s) lie.

If you have good air/fuel fidelity then you can dial it
in by the numbers and come pretty close. If it's a
sloppy fit then you really need the wideband's better
accuracy. And, you need to know that things like
large and variable + fuel trims are not going to step in
as soon as you turn your back.