EQ Ratio is same as PE multiplier but commanded AFR is higher. Commanding 10.7 PE and EQ but commanded AFR is 12.0. ? MAF only
EQ Ratio is same as PE multiplier but commanded AFR is higher. Commanding 10.7 PE and EQ but commanded AFR is 12.0. ? MAF only
Last edited by SPANKER; 10-06-2016 at 10:51 AM.
eq ratio gas is commanding 12.0 up to 4k then richens up to 11.7. unless you have a flex fuel sensor in place, the alcohol table is moot. Which is where the 10.7 is coming from.
The most hated, make the most power.
93 Ranger. 5.3 D1X. 1069hp.
Yes is flex fuel is on and working but wont richen up on Alcohol pe
Flex fuel timing is working correctly tried raising composition setting to see if it was keeping from applying the full percent change
whats the alcohol percentage reading at the sensor?
The most hated, make the most power.
93 Ranger. 5.3 D1X. 1069hp.
67%
have a log?
The most hated, make the most power.
93 Ranger. 5.3 D1X. 1069hp.
your stoich commanded is 10.88, wot is 7.5 {stoich double blah blah for injectors} start thinking in lambda, not afr. it will be easier to figure out. as far as the log itself. everything looks fine in the issues at hand, unless i am missing something, which is possible.
The most hated, make the most power.
93 Ranger. 5.3 D1X. 1069hp.
.AFR on wideband is basically 12.0 on two external Widebands. on alcohol PE im commanding say 10.8 why am i seeing 12.0? " AFR scale" 7.5 e85 should be 11.3 ish? thanks on 91 tune maf was tuned and equal to commanded
Because that's not how widebands work. They read in lambda, multiply x 14.7 and spit out the number. It doesn't matter if you're running methanol or gasoline, if the engine is running at stoich your wideband will spit out 14.7 no matter the fuel. It doesn't know (and can't tell) what stoich is for your fuel and has been programmed to use 14.7 no matter what.
Like previous poster said, if you're going to work with flex fuel vehicles you need to work in lambda.
Post a log and tune if you want help
VCM Suite V3+ GETTING STARTED THREADS / HOW TO's
Tuner by night
CPX Tuning
2005 Corvette, M6
ECS 1500 Supercharger
AlkyControl Meth, Monster LT1-S Twin, NT05R's
ID1000's, 220/240, .598/.598, 118 from Cam Motion
2007 Escalade, A6
Stock
I understand that. Why is alcohol pe not changing no matter how high you set it. Lambda .77. E85 afr 7.52 should equal gas scale 11.32 afr. It seems like alcohol pe isn't working.
Post a log and tune that was used during that log and I'll check it out. Otherwise I can't really say.
In the log/tune you've posted it's basically at 66% alcohol.
66% alcohol = stoich of ~21.5 (rounding) since you're using double stoich / half IFR presumably
If it were just using the gas PE EQ ratio then 21.5 / 1.25 (richest shown in the tune you posted) = 17.2 commanded
If it was using just the alcohol PE EQ ratio then 21.5 / 1.37 = 15.7
In reality it should be interpolating between the two values
It's actually commanding 15:1 or 0.69 lambda in the log that was posted.. so if anything it's going even richer than the alcohol table. Not sure why you'd want to increase the PE EQ ratio table when it's already commanding crazy rich.
Post a log and tune if you want help
VCM Suite V3+ GETTING STARTED THREADS / HOW TO's
Tuner by night
CPX Tuning
2005 Corvette, M6
ECS 1500 Supercharger
AlkyControl Meth, Monster LT1-S Twin, NT05R's
ID1000's, 220/240, .598/.598, 118 from Cam Motion
2007 Escalade, A6
Stock
On 91 octane before e85 was in tank afr on WB and commanded matched. I don't actually want it in the 10s afr on e85 but with e85 and 66% alcohol it seems to follow the regular pe commanded on what I'm actually seeing on wideband on either scale. Usually when commanded misses obviously maf or something is off. But it's acting like alcohol pe isn't working on what afr I'm actually seeing on WB. Hope this makes sense. Was thinking I missed composition or something to keep alcohol pe from working. Appreciate your help.
you're going to to have to rework the air flow tables to get the afr in the same range as commanded on flex fuel vehicles due to fuel differences it will not be the exact same. It's simple. look at the log. commanded afr. take that number and divide by to. It is doing what is commanded. if your wideband, or air flow tables are correct is a different story, but the ecm is doing what is commanded.
The most hated, make the most power.
93 Ranger. 5.3 D1X. 1069hp.
Commanded afr and wideband, in afr won't work on flex fuel setup without some extra math to correct the wideband to be based on the stoich for that fuel. It can be done, but much easier to just use lambda.
Wideband in afr will say 14.7 when you're at stoich even if you're running e85 and the actual afr is like 9:1.
You can't compare a wideband that's based on 14.7 and a commanded afr that's based on whatever stoich is for that particular E blend of the day.
Post a log and tune if you want help
VCM Suite V3+ GETTING STARTED THREADS / HOW TO's
Tuner by night
CPX Tuning
2005 Corvette, M6
ECS 1500 Supercharger
AlkyControl Meth, Monster LT1-S Twin, NT05R's
ID1000's, 220/240, .598/.598, 118 from Cam Motion
2007 Escalade, A6
Stock
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