using 14.047 for desired AFR and not 14.63?

[SSpdDmon]

Personally, I use an LM1. In the Innovate software, you can customize the analog output to read whatever you'd like. When you program it, you can do so using Lambda or AFR numbers. Straight from the instructions, it says this doesn't change anything - just the representation of the data. So...from there you need to decide what you want to work with. Then, you can program the sensor and set your PIDs.

If you want to work with AFR, you could program the following:
GAS=14.64.....0v=10.84.....5v=17.22....."({EXT.AD1 }*1.276)+10.84"
E10=14.07.....0v=10.42.....5v=16.55....."({EXT.AD1 }*1.226)+10.42"
E85=9.77.....0v=7.24.....5v=11.49....."({EXT.AD1}* 0.851)+7.24"

(All of the above are 0v=1.35 EQ and 5v=.85 EQ)

The equations are easy. The EXT.AD1 multiplier is simply the difference between your 5v and 0v values (5v-0v=difference) divided by the voltage spread (5v). So, for gas it was (17.22-10.84)/5=1.276. Then, you just add the 0v number on the end (outside of the brackets).

For logging EQ PIDs using those same AFR's (which translate into Lambdas of 0v=0.74074 & 5v=1.1765), the equation is a little more difficult. This is because EQ & Lambda aren't linear. A little Excel work and I came up with this equation:

EQ___0.0___2.0___"(-0.0008*({EXT.AD1}+1)*({EXT.AD1}+1)*({EXT.AD1}+1))+ (0.0179*({EXT.AD1}+1)*({EXT.AD1}+1))-(0.1895*({EXT.AD1}+1))+1.5223"

Someone will have to test that puppy out and see if it's right...and it's not going to be me this week (too much going on). Ideally, using those lambda numbers along with this PID equation, you should be able to disregard the AFR readout on the screen of the sensor. This means that, if I've done my math correctly, it won't matter what fuel is in the tank. If the sensor reads the mixture in terms of Lambda/EQ, this equation should back into the voltage output to provide you a stoich reading. In this case when EXT.AD1=2.975, you should be at stoich no matter what fuel type. When EXT.AD1=1.658, you should be at 1.13 EQ regardless of fuel type. And so on...

OK...so I lied. I made the custom PID & tested the formula using an old log I had AND.....drum roll please......it works.

[98 tigershark]

Thanks for doing that. Does the custom PID formula work on EFILive V1? I have never made a custom PID and before now really did not need or want to.
And is that the same one posted. Anyway thanks a bunch as that had to take some time so I appreciate that.
98 tigershark

[mr.prick]

I'm not seeing the point of this PID.

If you want to replace AFR with EQ
{B3601}/AFR = EQ
For Lambda
14.7/{B3601} = Lambda
Replace 14.7 with the multiplier your WBO2 uses.

[5.7ute]

I'm not seeing the point of this PID.

If you want to replace AFR with EQ
{B3601}/AFR = EQ
For Lambda
14.7/{B3601} = Lambda
Replace 14.7 with the multiplier your WBO2 uses.

Dont you mean AFR/{B3601} = Lambda?

[mr.prick]

Dont you mean AFR/{B3601} = Lambda?

I F&*@$! that up.


I meant AFR/14.7 = Lambda
{B3601} does not match my WBO2 setting for Lambda1.
EQ1 = 14.63
Lambda1 = 14.7
This is why I am sticking with AFR/EQ.

Thanks for catching that.

[SSpdDmon]

98 -

I use V1.

I'm not seeing the point of this PID.

If you want to replace AFR with EQ
{B3601}/AFR = EQ
For Lambda
14.7/{B3601} = Lambda
Replace 14.7 with the multiplier your WBO2 uses.

The point is, it works regardless of the stoich AFR point of the fuel in the tank or the setting in B3601 because it's going off of the voltage input from the sensor. The sensor reads lambda. Then we use a bunch of equations to convert to AFR. So, you can convert it back and forth around an assumed AFR or you can go off of EQ straight from the sensor. I like it because even if you don't know exactly how much ethanol is added, you can still get an accurate enrichment figure.



The attached calc_pids.txt file has the PID all set up. It's been tweaked to span 0v=0.75Lambda and 5v=1.09Lambda (gasoline AFR span of 11:1-16:1).

[98 tigershark]

Hey mr.prick/SSpdDmon

It does seem that some things are a mute issue but I think this PID if I understand it correctly will help me as to the fuel. I think that is going to become a very big deal if not already. Mr P Dont forget you use fuel enriched with Techron. 1% or so,=14.63.
nanner nanner nanner!!
SSpdDmon, thanks for the PID, I will use it, thanks as I said I have not made any Custom PIDs, I dont call setting up the LC1 when originally programing a custom PID. It seems like this one really works and has sparked my interest into those, so thanks.
Thanks for the PID
98 tigershark

I F&*@$! that up.


I meant AFR/14.7 = Lambda
{B3601} does not match my WBO2 setting for Lambda1.
EQ1 = 14.63
Lambda1 = 14.7
This is why I am sticking with AFR/EQ.

Thanks for catching that.

[SSpdDmon]

Hey mr.prick/SSpdDmon

It does seem that some things are a mute issue but I think this PID if I understand it correctly will help me as to the fuel. I think that is going to become a very big deal if not already. Mr P Dont forget you use fuel enriched with Techron. 1% or so,=14.63.
nanner nanner nanner!!
SSpdDmon, thanks for the PID, I will use it, thanks as I said I have not made any Custom PIDs, I dont call setting up the LC1 when originally programing a custom PID. It seems like this one really works and has sparked my interest into those, so thanks.
Thanks for the PID
98 tigershark

Remember, you need to reprogram your LC1 so that 0v=0.75Lambda and 5v=1.09Lambda for that equation to be accurate.

[98 tigershark]

Thanx for the mentoring.
It is very much appreciated.
98 tigershark

[CalEditor]

Real Case Scenario

05 Escalade came in with DTC's P0171 & P0174 Both banks lean.
Technician A thinks it has a bad MAF- he swapped the MAF out same results
Technician B thinks it has a leaking intake gsk and or warped intake (per TSB)
Technician C (myself) Asked what the MAF reading was at idle. Technician B states 7.XX g/sec. Technician C states that it has E85 in it or very low fuel pressure, but it has to be E85.

Technician A test the fuel Quality and find E70 in the tank.

The MAF reading is the diagnostic needed to figure this out. If the Maf was 4.xx g/sec it would have been a intake leak. 7 to 8 g/sec is about normal for this engine. This is a stock setup with no mods, so that means with the 7.XX g/sec the injectors are flowing the correct amount. With the exception of low fuel pressure, but we know that isn't the issue.