How can you adjust AFR in TunerPro?

**22lambo** · 11-24-2013, 01:36 AM

I just cant seem to figure out how to change the BLM, AFR, fuel maps, anything fuel related. I played with the spark maps to get the car to run good with the supercharger but it's running a little on the rich side and I want to lean it out a bit. Any tips on what maps to use or how to use them?

**sweet-94z28** · 11-25-2013, 12:19 AM

Do you still have a MAF on the car? If so, you will adjust the MAF tables. If not, you will adjust Volumetric Efficiency. You also may need to change closed TPS spark if it is rich at idle. WOT is a % change to commanded AFR.

If you would like, send me the tune and a list of your mods and I'll look through it.

**22lambo** · 11-25-2013, 02:20 AM

Originally Posted by sweet-94z28

Do you still have a MAF on the car? If so, you will adjust the MAF tables. If not, you will adjust Volumetric Efficiency. You also may need to change closed TPS spark if it is rich at idle. WOT is a % change to commanded AFR.

If you would like, send me the tune and a list of your mods and I'll look through it.

I do have the MAF on the car. I cant find any tables on tunerpro that will allow me to adjust them. Same for the VE. I will definitely keep the TPS spark table in mind. I will send you the tune tomorrow. I know it's not great but I want to mess around with it and make it better. Thanks by the way!

**bobdec** · 11-26-2013, 04:28 PM

The 4 tables in TunerPro RT for MAF tuning are "MAF Sensor Calibration Table 1 through 4" OR for SD Mode there are 2 tables "Volumetric Efficiency Vs RPM Vs MAP'" and "Volumetric Efficiency Vs RPM Vs MAP (Ext)" . How to use them is a bit more complex. Simplilicity wise to lean things out. ... For MAF you have to lower the frequency at the rich AFGS areas to make the PCM think less air is entering the intake, for VE you up (edit: this should be drop NOT up, had a brain fart while typing..Bob D.) the efficiency so the PCM adds less fuel. Assuming you are using a good .xdf that lists the tables.. As sweet stated, idle and low TPS % can be tuned specifically using other tables.. and PE is done another way. Allso if rich across the board then fuel pressure, injector settings and offsets would be something to look at.. Are you seeing low LT trims or is wideband showing rich.. got a data log ?

**GuillaumeC** · 11-26-2013, 04:58 PM

Originally Posted by bobdec

for VE you up the efficiency so the PCM adds less fuel.

It's the other way arround. Higher VE = more fuel.
If you have some cells in which it's running too rich you need to lower the VE number. That works in SD mode.

**JCzNova** · 11-26-2013, 05:04 PM

Originally Posted by GuillaumeC

It's the other way arround. Higher VE = more fuel.
If you have some cells in which it's running too rich you need to lower the VE number. That works in SD mode.

This is correct. You go towards zero to add less fuel, and some of my blocks even went into a negative number.

**22lambo** · 11-26-2013, 08:07 PM

Originally Posted by bobdec

The 4 tables in TunerPro RT for MAF tuning are "MAF Sensor Calibration Table 1 through 4" OR for SD Mode there are 2 tables "Volumetric Efficiency Vs RPM Vs MAP'" and "Volumetric Efficiency Vs RPM Vs MAP (Ext)" . How to use them is a bit more complex. Simplilicity wise to lean things out. ... For MAF you have to lower the frequency at the rich AFGS areas to make the PCM think less air is entering the intake, for VE you up the efficiency so the PCM adds less fuel. Assuming you are using a good .xdf that lists the tables.. As sweet stated, idle and low TPS % can be tuned specifically using other tables.. and PE is done another way. Allso if rich across the board then fuel pressure, injector settings and offsets would be something to look at.. Are you seeing low LT trims or is wideband showing rich.. got a data log ?

Okay, there is my problem. I don't have ANY of those tables in Tuner Pro. What gives? And I know its rich do to a few failed smog tests and my wideband. For some reason i cant data log in TP