AFR table stops at 7500...
#1
AFR table stops at 7500...
Very much a newbie at this and have a race on Sunday (3 days time)
I am concerned my AFR 1 table only goes to 7500.
I have a semi built motor and "believe" I can rev to 7800 or so.....
What happens when I go over the AFR table at 7500, is this an end of the world, doomsday scenario...?
How do I get the table to go to 8200 or therabouts for safety?
Also, can someone post up a afr table that I should use. The default has lowest afr at 12 (from memory).
From what I have read and seen in the past higher rpm/load should be 11.0 - 11.5 ish...does that sound right?
I am concerned my AFR 1 table only goes to 7500.
I have a semi built motor and "believe" I can rev to 7800 or so.....
What happens when I go over the AFR table at 7500, is this an end of the world, doomsday scenario...?
How do I get the table to go to 8200 or therabouts for safety?
Also, can someone post up a afr table that I should use. The default has lowest afr at 12 (from memory).
From what I have read and seen in the past higher rpm/load should be 11.0 - 11.5 ish...does that sound right?
#10
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Unless OP is using incorporate AFR, whereby the AFR target table is a part of the fueling equation.
But it matters not, as you pass the limit of the table, the numbers don't drop to zero, merely don't change for that axis.
#12
that is not at all what we're talking about.
we had a discussion about it a few months back. "incorporate afr" is an algorithm or something like that, that the MS uses to calculate your fueling. the afr target plays a bigger role in overall fueling vs using ve map exclusively
something like that. I'll let him describe it better because its fairly lengthy to fully explain
or you can search about it.
the MS "incorporates" your wideband at all times, so that's different.
we had a discussion about it a few months back. "incorporate afr" is an algorithm or something like that, that the MS uses to calculate your fueling. the afr target plays a bigger role in overall fueling vs using ve map exclusively
something like that. I'll let him describe it better because its fairly lengthy to fully explain
or you can search about it.
the MS "incorporates" your wideband at all times, so that's different.
#13
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Yeah as above, incorporate AFR is a feature which takes the AFR target and adds it into the fuelling equation.
Once tuned you end up with a proper VE table, and if say you decide you want to run 11.5 instead of 11.8:1 at 200kpa through the rev range you'd just edit the AFR target table and hey presto with no further tuning that's the AFR that you'd be running.
Without incorporate AFR on the target table is just that, a target, and is used by the ECU during closed loop conditions and by TunerStudio/MegaLogViewer during VE analysis.
Once tuned you end up with a proper VE table, and if say you decide you want to run 11.5 instead of 11.8:1 at 200kpa through the rev range you'd just edit the AFR target table and hey presto with no further tuning that's the AFR that you'd be running.
Without incorporate AFR on the target table is just that, a target, and is used by the ECU during closed loop conditions and by TunerStudio/MegaLogViewer during VE analysis.
#15
My supposition was that the VE table is your ACTUAL fueling.
And that the AFR table is a target that the MS uses when "Incorporate AFR" is activated. It targets the AFR value in the table via an algorhythm that only WEIGHTS the VE table towards the AFR table + or - as required but doesn't run the vehicle exclusively by the AFR table over the VE table....
So even if the VE is not absolutely spot on having it aim towards the AFR table value will help achieve the more desired overall AFR (presuming that the AFR table is about right...)
am I on the right track...?
And that the AFR table is a target that the MS uses when "Incorporate AFR" is activated. It targets the AFR value in the table via an algorhythm that only WEIGHTS the VE table towards the AFR table + or - as required but doesn't run the vehicle exclusively by the AFR table over the VE table....
So even if the VE is not absolutely spot on having it aim towards the AFR table value will help achieve the more desired overall AFR (presuming that the AFR table is about right...)
am I on the right track...?
#16
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My supposition was that the VE table is your ACTUAL fueling.
And that the AFR table is a target that the MS uses when "Incorporate AFR" is activated. It targets the AFR value in the table via an algorhythm that only WEIGHTS the VE table towards the AFR table + or - as required but doesn't run the vehicle exclusively by the AFR table over the VE table....
So even if the VE is not absolutely spot on having it aim towards the AFR table value will help achieve the more desired overall AFR (presuming that the AFR table is about right...)
am I on the right track...?
And that the AFR table is a target that the MS uses when "Incorporate AFR" is activated. It targets the AFR value in the table via an algorhythm that only WEIGHTS the VE table towards the AFR table + or - as required but doesn't run the vehicle exclusively by the AFR table over the VE table....
So even if the VE is not absolutely spot on having it aim towards the AFR table value will help achieve the more desired overall AFR (presuming that the AFR table is about right...)
am I on the right track...?
With incorporate AFR off, the VE table is the actual fuelling table + or - any temp and barometric based corrections.
The ECU will then use the target table to add/remove fuel assuming you have EGO authority enabled i.e. closed loop. This is best used not as a bandaid to a poorly tuned VE table, but to perfect the fueling due to minor atmostpheric changes etc.
With incorporate AFR turned on the above is also true i.e. closed loop operation, however the AFR targets are also a part of the fueling equation, so if you want to change the AFR of a part of your tune, you literally change the numbers in the target table and hey presto the actual AFR will have changed with no tuning or changes to the VE table required.
Incorporate AFR off:
PulseWidth = ReqFuel * VE(rpm,map) * MAP * GammaE
Incorporate AFR on:
PulseWidth = ReqFuel * VE(rpm,map) * MAP * stoich / targetAFR(rpm,map) * GammaE
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09-05-2015 08:02 AM