Commanding AFR

QWKSNKE · 08-23-2005, 06:13 PM

After doing some reading on eectuning.org I am wondering if I have been doing this wrong in my car.

In the past I have been using the function WOT_fuel_multiplier vs rpm. I would adjust this on the dyno to dial in my w/band AFR. Is this wrong? Should I be doing this Tables under Fuel_table_base_OL?

Dale McPeters · 08-23-2005, 08:05 PM

You should be dialing in the MAF curve to match the base OL fuel table...........with adaptive disabled. When this is accomplished recheck load if correct turn adaptive back on. From then on you can use the fuel table and your tune will not change all the time (if the maf etc. is correct of course).

Go here he should have the A9L stuff fixed by now.

http://www.geocities.com/efipunk/

QWKSNKE · 08-23-2005, 08:13 PM

ahhh...Thank you very much. Hadn't seen that. Now I am going to review this for a little while before bed

Dale McPeters · 08-23-2005, 08:22 PM

boss96 · 08-23-2005, 08:34 PM

I think the best use for the wot fuel mult. is if you have a pegged maf where you can increase fuel by rpm, not airflow.
Bob

QWKSNKE · 08-23-2005, 08:35 PM

ok question (while it is fresh on my mind)

Do I set the WOT_fuel_multiplier vs rpm at 1? (really don't remember what it was set at originally)

-and-

When is this Function used? In other words, at what point would you change it?

QWKSNKE · 08-23-2005, 08:36 PM

Quote:

Originally Posted by boss96

I think the best use for the wot fuel mult. is if you have a pegged maf where you can increase fuel by rpm, not airflow.
Bob

oh ok..

QWKSNKE · 08-23-2005, 08:40 PM

So am I understanding this right in that I turn adaptive off while performing the 'chart' on the dyno

86GT · 08-23-2005, 09:52 PM

Quote:

Originally Posted by Dale McPeters

You should be dialing in the MAF curve to match the base OL fuel table...........with adaptive disabled. When this is accomplished recheck load if correct turn adaptive back on. From then on you can use the fuel table and your tune will not change all the time (if the maf etc. is correct of course).

Go here he should have the A9L stuff fixed by now.

http://www.geocities.com/efipunk/

Dale I read his theory (efipunk) and I think he has it backwards. KAMRF's below 1 are pulling fuel not adding. The KAMRF's below 1 mean the car is running rich and the EEC is pulling fuel (leaning) to compensate.

Base Fuel = (.5 * MAF * KAMRF) / (14.64 * LAMBSE)

In the above equation if all variable are constant except KAMRF then the Base Fuel follows.

The MAF correction should be MAF * KAMRF.

Dale McPeters · 08-24-2005, 06:50 AM

Clint,

I have not looked at it in the past week or so as I thought he had it all fixed. I will go take a look here in a bit as I have a meeting until noon. He might possibly have a typo very easy to do as I know this first hand.

08-23-2005, 06:13 PM	#1
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	Commanding AFR After doing some reading on eectuning.org I am wondering if I have been doing this wrong in my car. In the past I have been using the function WOT_fuel_multiplier vs rpm. I would adjust this on the dyno to dial in my w/band AFR. Is this wrong? Should I be doing this Tables under Fuel_table_base_OL? __________________ 2009 Porsche Carrera S 2008 ///AMG C63.. Eurocharge Tune. RIP 2019 AMG GLC43..wife's 03 F250 SD.. Edge Evo, AFE Stage 1 CAI 08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's 01 Cobra vert... wife's I need a new toy

08-23-2005, 08:05 PM	#2
Dale McPeters 5.0 Block/Walnut Cracker Join Date: May 2005 Location: Working.... Posts: 2,409	Re: Commanding AFR You should be dialing in the MAF curve to match the base OL fuel table...........with adaptive disabled. When this is accomplished recheck load if correct turn adaptive back on. From then on you can use the fuel table and your tune will not change all the time (if the maf etc. is correct of course). Go here he should have the A9L stuff fixed by now. http://www.geocities.com/efipunk/

08-23-2005, 08:13 PM	#3
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	Re: Commanding AFR ahhh...Thank you very much. Hadn't seen that. Now I am going to review this for a little while before bed __________________ 2009 Porsche Carrera S 2008 ///AMG C63.. Eurocharge Tune. RIP 2019 AMG GLC43..wife's 03 F250 SD.. Edge Evo, AFE Stage 1 CAI 08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's 01 Cobra vert... wife's I need a new toy

08-23-2005, 08:22 PM	#4
Dale McPeters 5.0 Block/Walnut Cracker Join Date: May 2005 Location: Working.... Posts: 2,409	Re: Commanding AFR

08-23-2005, 08:34 PM	#5
boss96 Member Join Date: May 2005 Posts: 47	Re: Commanding AFR I think the best use for the wot fuel mult. is if you have a pegged maf where you can increase fuel by rpm, not airflow. Bob __________________ 1996 GT, forged parts, vortech, ZXA3 processor, etc.

08-23-2005, 08:35 PM	#6
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	Re: Commanding AFR ok question (while it is fresh on my mind) Do I set the WOT_fuel_multiplier vs rpm at 1? (really don't remember what it was set at originally) -and- When is this Function used? In other words, at what point would you change it? __________________ 2009 Porsche Carrera S 2008 ///AMG C63.. Eurocharge Tune. RIP 2019 AMG GLC43..wife's 03 F250 SD.. Edge Evo, AFE Stage 1 CAI 08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's 01 Cobra vert... wife's I need a new toy

08-23-2005, 08:40 PM	#8
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	Re: Commanding AFR So am I understanding this right in that I turn adaptive off while performing the 'chart' on the dyno __________________ 2009 Porsche Carrera S 2008 ///AMG C63.. Eurocharge Tune. RIP 2019 AMG GLC43..wife's 03 F250 SD.. Edge Evo, AFE Stage 1 CAI 08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's 01 Cobra vert... wife's I need a new toy

08-24-2005, 06:50 AM	#10
Dale McPeters 5.0 Block/Walnut Cracker Join Date: May 2005 Location: Working.... Posts: 2,409	Re: Commanding AFR Clint, I have not looked at it in the past week or so as I thought he had it all fixed. I will go take a look here in a bit as I have a meeting until noon. He might possibly have a typo very easy to do as I know this first hand.