HP Tuners AFR Error Correction Graph Setup

A brief explanation on how to setup an AFR correction graph that you can use to quickly whip your VE tables into shape. This is a follow up to my Wideband via EGR sensor video and includes the math formula you'll need to setup your graph with that gauge method.
**You will need to look in the scanner for the sensor ID number for your application. For EXAMPLE the ID number for my EGR is 2811, yours may be different. **

[@richbayer7523]

holy crap thank you for this. I've been pulling my hair out for days trying to figure this out. finally got a couple hours straight to wrap my head around this and actually get it dialed in. they changed the software since the last time I've done this by backfeeding thru the EGR but I'm using an AC pressure sensor now.

[@garybear8685]

Thanks for the video. I'm gonna save it as I get closer to getting mine done.

[@4xsilverado]

appreciate it man. this helped me a lot

[@brentkennett4097]

Thanks mate, perfect explanation 👌

[@JKZ103]

Good stuff man. Thank you

[@kolemieux]

Very well explained - great work and thanks for it.

[@stevenelliott5768]

Literally the most laid back video I've watched yet simplified everything, only thing I'm trying to understand is the math I have readings in the 10 kpa cells only, on my afr err, im using an aem 30-4110 uneder serial input, any advice on how.to.fix this?

[@scottcoleman162]

Check that your graph is formatted correctly in the settings. It needs to have the entire range of kpa that you want to log.

[@stevenelliott5768]

@@scottcoleman162 I'll double check, I thought I set it up right thank you

[@darinhenningsgard8833]

Thanks for the info!

[@scottcoleman162]

Darin Henningsgard you're welcome!

[@HenryJp510]

Question. Your using your egr sensor as your reference for the wide band, or you’re using an afr kit in the place of egr sensor? I’m pretty sure it’s the first option, I’m just making sure you didn’t need an afr gauge installed to make these revisions.

[@scottcoleman162]

I'm using an AEM wideband gauge that has a 0-5 volt output reference. That reference is then input into the EGR pin of the pcm, then in the scanner I can log the EGR voltage (EGR voltage is also 0-5 volt) no EGR sensor is used, just the wiring input that goes into the computer. Then you basically change the math so that the scanner displays a numerical value based off the voltage it sees on the EGR pin.

[@steve1714]

Hi, are you able to explain in further detail about how to do the math parameters for the AFR Error please?

[@scottcoleman162]

Sure what about it would you like to know?

[@steve1714]

I was hoping you could explain again what you typed in, so the histogram knows the difference between commanded afr vs actual afr. Thanks

[@richbayer7523]

only problem and i cant figure this out but the graph works once... that's it. if i stop logging and go back, it wont work again. no clue why. changed map sensors and verified everything was right...

[@scottcoleman162]

It has to be saved, it's been a while since I've used the software since converting to ms3 but remember that there is a particular way to save all of the charts, graphs and maths.

[@steveh1256]

I have seen that equation for AFR error used in several vids and various posts but after I set up my table using that equation all I got was no data in my cells. Shows that something was logged but no data. Someone pointed out that 2811 is the PID for EGR voltage. Shouldn’t it be ([AFR actual]-[commanded AFR])/[commanded AFR] which would be in your case 60001-6001/6001? Then again I guess the formula (2811.10/5)+10 is the same thing. No idea why I’m not seeing numbers

[@scottcoleman162]

As far as having no data showing, double check your pid to see what number is assigned to your egr or whatever input you are using, they're not all the same depending on operating system.

[@steveh1256]

Thanks for the reply. I found out the hard way that sometimes things like a change in a math formula won’t work until you close then reopen the scanner.

[@ttsleazy9791]

When you log do you have it in open loop and fuel trims shut off?

[@scottcoleman162]

I run a SD tune in my turbo application which is always open loop. I wouldn't allow closed loop when making adjustments to the VE table just to help simplify things.

[@ttsleazy9791]

Even after youre done tuning? Leave it in open loop?

[@scottcoleman162]

No when you're done and happy with the VE table you can restore closed loop. I don't run closed loop because I only use wideband sensor (no narrow bands), it stays pretty consistent considering... The only time I get AFR fluctuations is when there's a dramatic outside temperature change and then it's just a matter of trimming or adding a small percent of fuel to get it all back in line.

[@lpss7738]

I want more details about ve can you help me

[@scottcoleman162]

What details do you need?

[@lpss7738]

@@scottcoleman162 I want to conect AFR to my vcm scaner

[@RAWRMotorsports]

My eyes can't see the equation

[@ludoviccharestguerard8173]

The equation do not work for me

[@scottcoleman162]

ludovic charest guerard, the numbers that designate the sensors are different depending on pcm or operating system. You'll need to lookup the sensor in the scanner to see what yours are numbered.