I'm tuning for MAF using a wide band, but not logging it on hp tuners. If I'm rich (10.2) in a cell during pe, but my commanded pe afr is 11.7 should I increase or decrease the given cell. Also, to find out how far it is off should I divide the # by 11.7 or 14.7.
EX: 10.2 is 87% of 11.7 so should I multiply the given cell by .87?

 

Well then, let me rephrase. If I'm rich, do I increase or decrease the g/sec.

 

the lower the number the leaner you can get it. drop it by .01 at a time. the easiest way i found of doing this is set pe at 11.5 all the way through. then add or drop maf. after words set the pe to where u actually want it, get a hist going and see where ur at.

 

So lowering the maf #'s will make me more lean?

 

you need to create a histogram that will record your % AFR error.

which will calculate the percentage that your ACTUAL AFR is off from your COMMANDED.

after driving around and hitting all the cells multiple times,
you use that table of error, and paste it by % into the corresponding table.


rinse repeat until the error starts to get around 0-2% you wont get it much better than that.

 

Don't forget to config your tune for open loop with no adders:

https://www.cobaltss.net/forums/show...50&postcount=2

(This post is for ve tuning, but can be used for maf just don't fail the maf.)

 

Ahhh good old maf......I made my car sound like it was cammed the other day because of the maf hehe...my a/f gauge wasn't even reading anything....sounded mean

 

I tried setting up a pid using the a/c sensor and it didn't work. So now I'm using the program that the wide band came with to chart AFR vs RPM. Using HP tuners scanner I can see what MAF hz I'm at during a particular time in the run. I know this is not the easiest way, but I've given up trying to get the a/c sensor to work. So if I'm rich should I reduce the MAF #?

 

you are right, tell the computer it is getting less air and it will lean it out. I asume you arn't using the hptuners pro. I would be a lot easier if you could configure a histogram to work with using the ac press signal and your wideband.

 

Bee careful using the ac sensor method. I tried it, and I got a crazy pressure blowoff from my ac unit.

 

that pressure thing happened to me too........3 times. The dealer recharged it all 3 times though for me. I ended up buying HP tuners PRO.

 

lol. Me too. well worth it. And if i ever wind up not needing it to tune anymore, I can sell it.

 

I guess I should just upgrade and make my life easier. Does anyone know off hand what the cost is.

 

$199 us

 

Hmmm, I did just get my refund check...

 

lol. Good money spent. And then you can tune for different times of year. Put together a gas sipping tune for winter like anom...

 

Good point

 

Who tunes with the ac on ????

 

What?

 

^^^x2

 

if you unplug the compressor clutch and the sensor how do you get high press in the ac system??