I want to adjust my WOT afr because its running way rich(10.3ish) from 3200 - 6700rpm. So I'm looking at this table and at 3000rpm it says 2.572.

Can someone explain what that means?

 

I don't even see how that's possible. Your stock value at that table should be 1.130, which equates to 13.0 AFR. 2.572 is 5.72 commanded AFR. I must be missing something here. To get your fuel multiplier divide 14.7 (stioch) by the AFR you want to command. For example:

14.7/13=1.130 <- you would put 1.130 in the rpm cells where you want to command 13.0 AFR.

Are you sure you read the number correctly, or maybe mistyped or something?

 

 

sweet jesus that is a high PE table.

 

thats weird you guys say that, because my afrs are pretty good until around 3000 it starts going on the rich side. The MAP is disabled. Does that clarify anything?

 

I'm going to bet that predictive airflow wasn't disabled on the boosted 2.4L.

 

what is predictive airflow?

 

predictive air flow would basically be what the ecu is expectin the air flow to be comin into the motor at any givin time. when boosted it cant really expect any certain amount cuz it could change at any time cuz its boosted.

 

This type of thing happens when people try to compensate for one problem by changing somewhere else. Not saying you shouldn't do that, because sometimes you have to. Tell me this, what is your commanded AFR when you are running rich? I mean, I know what it show show commanded, but what do your logs say?

 

You can pretty much use that table with the percentages you want to add or decrease fuel. Like you want about 7-8% less fuel you just divide those numbers by 7-8%

 

I haven't figured out how to log using HPT so I'm just going off looking at the WB, and I'm seeing mid 10s afr around 3k to 3.5k and 10.0 by redline.

Am I looking at the correct that needs to be modified in order to reduce the amount of fuel (lean it out)?

 

No it blends two seperate systems of metering air to compensate for errors in either.

 

Well, first of all, you need to learn to log your car to see what it's doing. It's not hard You should be a logging pro before you ever touch your tune in any big way. I know it is a bit late for that now, but dude, how do you expect to know what to change if you don't even know what your car is doing? Someone put those PE numbers in there for a reason, I can't tell you what that reason might be, but from the looks of things you are getting AFR errors of like 100% or something if your PE is commanding 5.7 and you are pulling 10.xx. I can't tell you what would happen if you change the commanded.

 

Try disableing the dynamic Airflow and run a stright MAF Tune then start leaning you PE table out after you are able to log it on your pro box.

To disable the dynamic Airflow, go to this table and set the set the disable to like 600 RPM and the Re-enable to 500 RPM's this will cause it to base all fuel calulations off the MAF
here's a screen shot for referance.


Also try disabling you COT table that will just throw another wrench into the feul tuning.

 

Will disabling the COT and dynamic airflow mess with my afr's while not in PE? I'm going to figure out how to log wb on Thursday hopefully.

 

First off here is a quick explanation of what Dynamic airflow is.

Look at it this way.
If it’s using a VE/MAF blend, then any errors in your VE will carry over into your MAF tune. For example, your VE is 10% lean at "X" amount of airflow; however your MAF value "Y" is accurate at that same point. Now your trim may say you are lean by 5% so you now have leaned out your MAF "Y" by 5% from a previously accurate value ([X+Y]/2=dynamic value). Although there isn't currently a way to fix the VE portion, its no reason mess with the MAF because those same two values may not match up again if the temperature or weather changes (i.e. "X" may now match up with "Y+10" when the air is colder and more dense).

I would like to thank Witt for explaining this too me


Second Cat over Temp is a secondary fuel adder that is added in at a certain temp threshold that will make it hard to get a steady AFR.

 

Here are two logs with logged wideband. It's actually not as rich as I thought I guess.

Also the tune is attached. I thought I attached it.

http://www.negmsc.com/uploads/wblog.hpl
http://www.negmsc.com/uploads/wb2.hpl
http://www.negmsc.com/uploads/24tune.hpt

Looking for suggestions on what to do next!

 

bump! I attached the tune.