going rich at WOT by fuel trims at the strip, give me a hand please?
07-28-2005, 06:53 PM
#1
going rich at WOT by fuel trims at the strip, give me a hand please? ok went to the strip, fuel trims were always 0 when on the street and easing into 1st gonig wot, at the strip they were +8 and then i tuned it and it was +7, what can i look at and what can i adjust to fix this, the car is reading 980-990 mv and i assume thats killing power?
07-28-2005, 07:28 PM
#3
wot is perfrect, i get no knock and on the street the car feels nasty fast, at the strip she felt a lot slower, would o2 readings going from 900 on the street and then to 980-990 at the track kill that much power? why do the fuel trims come up that high, is it in the tune or what? plus i have some knock i think i may have to take car or part throttle, but that might just be from the burnout and fast throttle changes, may be false but i need to figure it out.
07-28-2005, 07:54 PM
#5
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Log the FTC and the trims, sort or plot by trim value
and see what the FTC is that's hitting you with
positives and what that indicates for operating point
and, in turn, what air or fuel actor needs to be
schooled (like low RPM=VE, high RPM=MAF, etc.).
and see what the FTC is that's hitting you with
positives and what that indicates for operating point
and, in turn, what air or fuel actor needs to be
schooled (like low RPM=VE, high RPM=MAF, etc.).
07-28-2005, 08:23 PM
#6
i should have said that i am in SD mode, right before i go WOT the trims are right around 0, at wot, ftc 22, i go way rich. jimmy, can you explain on this, is this the info you were talking about? first time i was about +10, then i tuned it and it went to +6, i just dont get why it was never this way on the street.
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07-29-2005, 09:30 AM
#9
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I think 22 is a cell that covers too much ground. You
can see 22 at a fairly wide range of operating points.
I've been reading up on Cell 22 and see that it's had
a lot of fragmented discussion (but no Unified Theory
Of Why It Sucks). But check this:
https://ls1tech.com/forums/pcm-diagnostics-tuning/209112-crap-ftc-22-comes-up-randomly-bink-anybody.html
Now, you know you have O2 heat / switching problems.
My guess is, you are sitting there idling at the track,
cold header O2s drop you into Cell 22 while trying to
get the things back working, but also drive some bad
trimming, and then 22 is also used for WOT.
In that thread wait4me indicates that heater power is
switched on and off. I have always wondered about
this, and whether it might not be better to rewire the
O2s so that heater power runs off IGN (perhaps dummy
loads on the PCM heater drivers, if disconnecting them
makes faults). This would (perhaps) eliminate Cell 22
trimming and other sensor-heat-related issues at least
with the hotter units you're running. Presuming that
heater power is indeed switched and in response to
observed loop failure, which would mean you don't heat
until things have already gone to ****. This I would like
to know, wonder if it (heater status) is something that
can be logged. If not, somebody industrious ought to
put a voltmeter to the heater lines and see if it shuts
off and on.
can see 22 at a fairly wide range of operating points.
I've been reading up on Cell 22 and see that it's had
a lot of fragmented discussion (but no Unified Theory
Of Why It Sucks). But check this:
https://ls1tech.com/forums/pcm-diagnostics-tuning/209112-crap-ftc-22-comes-up-randomly-bink-anybody.html
Now, you know you have O2 heat / switching problems.
My guess is, you are sitting there idling at the track,
cold header O2s drop you into Cell 22 while trying to
get the things back working, but also drive some bad
trimming, and then 22 is also used for WOT.
In that thread wait4me indicates that heater power is
switched on and off. I have always wondered about
this, and whether it might not be better to rewire the
O2s so that heater power runs off IGN (perhaps dummy
loads on the PCM heater drivers, if disconnecting them
makes faults). This would (perhaps) eliminate Cell 22
trimming and other sensor-heat-related issues at least
with the hotter units you're running. Presuming that
heater power is indeed switched and in response to
observed loop failure, which would mean you don't heat
until things have already gone to ****. This I would like
to know, wonder if it (heater status) is something that
can be logged. If not, somebody industrious ought to
put a voltmeter to the heater lines and see if it shuts
off and on.
07-29-2005, 10:12 AM
#10
well when i made these runs the car was shut off for about 10 min before the racing started. then i made 3 runs in a row without shutting the car off one time and they are all positive again. i will try to read up on that. i would like to figure this out. thanks, and any more info or advice you all have let me know. i could also send me logs
07-29-2005, 10:35 AM
#12
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Originally Posted by jimmyblue
In that thread wait4me indicates that heater power is
switched on and off. I have always wondered about
this...
If not, somebody industrious ought to
put a voltmeter to the heater lines and see if it shuts
off and on.
switched on and off. I have always wondered about
this...
If not, somebody industrious ought to
put a voltmeter to the heater lines and see if it shuts
off and on.
07-29-2005, 04:16 PM
#15
hows this sound
after the burn out idle at ftc 20, trims +9 and +11, went wot and the trims all went to +9 from those numbers i just mentioned, never went to 0, never reset my fuel trims after i put the next tune in the car. in the new tune i added more fuel and the trims went to +7, is it possible the trims were remembered through the runs so they never reset themselves becuase they were positive alreayd, i would have to reset them, and the ve changes i made the computer knows about so it didnt add as much fuel cause it already had it. that is the only odd log i have, the very first run, after the car sat 10 min. sound like the source?
after the burn out idle at ftc 20, trims +9 and +11, went wot and the trims all went to +9 from those numbers i just mentioned, never went to 0, never reset my fuel trims after i put the next tune in the car. in the new tune i added more fuel and the trims went to +7, is it possible the trims were remembered through the runs so they never reset themselves becuase they were positive alreayd, i would have to reset them, and the ve changes i made the computer knows about so it didnt add as much fuel cause it already had it. that is the only odd log i have, the very first run, after the car sat 10 min. sound like the source?
07-30-2005, 10:59 AM
#19
Originally Posted by WS6FirebirdTA00
hows this sound
after the burn out idle at ftc 20, trims +9 and +11, went wot and the trims all went to +9 from those numbers i just mentioned, never went to 0, never reset my fuel trims after i put the next tune in the car. in the new tune i added more fuel and the trims went to +7, is it possible the trims were remembered through the runs so they never reset themselves becuase they were positive alreayd, i would have to reset them, and the ve changes i made the computer knows about so it didnt add as much fuel cause it already had it. that is the only odd log i have, the very first run, after the car sat 10 min. sound like the source?
after the burn out idle at ftc 20, trims +9 and +11, went wot and the trims all went to +9 from those numbers i just mentioned, never went to 0, never reset my fuel trims after i put the next tune in the car. in the new tune i added more fuel and the trims went to +7, is it possible the trims were remembered through the runs so they never reset themselves becuase they were positive alreayd, i would have to reset them, and the ve changes i made the computer knows about so it didnt add as much fuel cause it already had it. that is the only odd log i have, the very first run, after the car sat 10 min. sound like the source?
07-30-2005, 12:26 PM
#20
yeah man i dont know, maybe it was because i just start the car after it sat for about 10 min? ive got the log file of that and some idle stuff if you want to look at it.
in my idle logs, for 2:38 after start up, the o2 sensors go totally lean and then the fuel trims come to normal, its quite odd and id like someone to take a look to see if im just missing something here
in my idle logs, for 2:38 after start up, the o2 sensors go totally lean and then the fuel trims come to normal, its quite odd and id like someone to take a look to see if im just missing something here