PE delay rpm set to 5500 stock?!?!
09-12-2005, 01:16 PM
#1
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PE delay rpm set to 5500 stock?!?! Well, my buddy's 2001 SS camaro has been having some pinging issues with the warm weather. We have been hunting them down without much success. We even richened up the PE a decent amout with no luck. Was browsing thru his tune and mine recently and noticed his PE enrichment delay rpm was set to 5500! This seems pretty high to me, even for a factory tune. Anybody else seen this?
09-12-2005, 01:24 PM
#3
According to the people that sell HP Tuners, that is ignored in all car calibrations. See post #7 in this thread. https://ls1tech.com/forums/pcm-diagnostics-tuning/322088-pe-enable-mode-delay-rpm-insight.html
09-12-2005, 01:54 PM
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Well crap. First off that help file bit is definitely misleading. Hopefully they change that in version 2.0.
Secondly, then the only thing controlling WOT AFR is the enrichment vs. rpm table? This is originally what I thought.
Secondly, then the only thing controlling WOT AFR is the enrichment vs. rpm table? This is originally what I thought.
09-12-2005, 02:24 PM
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Mode delay means that below that RPM you will
roll on at the PE Enrichment Rate. If Rate is 1.0
than, bang, you're in it. Check this by observing
the Fuel Air Multiplier, does it step up or slide up?
Might be mroe an issue with the Enable MAP,
Enable TPS thresholds if this is a part throttle,
medium load issue.
If it's only when throttle is rolling on, that's
probably more about the speed density tune. Have
to see the initiating events to decide, if it pings
before PE then you may (or not) want to bring PE
in earlier. I wouldn't use early PE to cover up a
simple lean hole from the VE table though.
PE is one of a few sources, in a stock setup it's the
one that wins (unless COT is on) but once you start
leaning it out you have to keep the other actors in
line (esp. Open Loop Fuel Air).
roll on at the PE Enrichment Rate. If Rate is 1.0
than, bang, you're in it. Check this by observing
the Fuel Air Multiplier, does it step up or slide up?
Might be mroe an issue with the Enable MAP,
Enable TPS thresholds if this is a part throttle,
medium load issue.
If it's only when throttle is rolling on, that's
probably more about the speed density tune. Have
to see the initiating events to decide, if it pings
before PE then you may (or not) want to bring PE
in earlier. I wouldn't use early PE to cover up a
simple lean hole from the VE table though.
PE is one of a few sources, in a stock setup it's the
one that wins (unless COT is on) but once you start
leaning it out you have to keep the other actors in
line (esp. Open Loop Fuel Air).
09-12-2005, 03:25 PM
#6
I'll see that the help file gets fixed...
Things you can do:
1. Set PE Enrichment rate to 4.0 (the maximum value)
2. Set the TPS% lower to enter PE
3. Set MAP enable to 15 (if not there already
Also, look at your Open Loop F/A table...if the values in the bottom, right-hand corner are larger than what you are putting into your PE table, it will choose those values instead (since it wants the richer of the two values).
Things you can do:
1. Set PE Enrichment rate to 4.0 (the maximum value)
2. Set the TPS% lower to enter PE
3. Set MAP enable to 15 (if not there already
Also, look at your Open Loop F/A table...if the values in the bottom, right-hand corner are larger than what you are putting into your PE table, it will choose those values instead (since it wants the richer of the two values).
09-13-2005, 09:14 AM
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Thanks Jimmy and Steve, will give some more work this weekend.
Just to clarify more, the pinging only happens at WOT, and is mainly around 4500-5500 rpm. Unfortunately there is no wideband to help on this car, but we will see what we can do.
Just to clarify more, the pinging only happens at WOT, and is mainly around 4500-5500 rpm. Unfortunately there is no wideband to help on this car, but we will see what we can do.
