edge04

Currently have a W/B hooked up to my aerforce gauge and when in PE I read 10.2 even though I am commanding 11.69. Am I missing something in my tune and adding fuel somewhere?

I'm in the process of installing my AFX and will track in HPT and start tuning WOT

Here is my tune and log

edge04

I started to wonder if I was adding fuel in my open loop EQ ratio IVT table? But still curious why my commanded would be accurate. Do others with aerforce notice large differences?

realcanuk

I am not an expert but if you have the wideband properly hooked to the aeroforce and the setting right than it should read fine. Mine does. The point of the tuning is to get it to run what you are commanding. I would assume you need to dial in the VE and MAF more so that it delivers what you command. I notice the MAF high freq is all 0's. That doesn't seem right to me.

edge04

No MAF. My closed loop is reading accurate so I would assume the gauge is calibrated, I can calibrate again and see if that does anything. Hopefully get my AFX set up soon and can tune lambda error and compare.

realcanuk

Got it. You say get AFX set up. What wideband are you using now ?

edge04

I will be hooking up the NGK w/b which plugs into the AFX monitor but will really just calibrate it into HPT to tune lambda error. Currently run the one that came from aerforce which I believe is a Bosch. Have to think it is a false reading but sure seems like a lot.

realcanuk

Will be good to know if its accurate. I use a Zietronix wb on my aeroforce and HPT and its accurate on both. I also tune in lambda as its much easier that way.

sliderbkt

My aeroforce is doing the exact same thing! Cruising it bounces around stoich, but at WOT it reads 10.1. My plugs don't agree though, they look perfect.

sliderbkt

I am going to perform an open air calibration outside of the exhaust.

Unreal

Postive fuel trims will be applied to commanded PE so that could be part of it. Your commanded will only match your actual when the tune is spot on. Sounds like your settings are lean so it is adding a bunch of fuel through the fuel trims, or it is way richer than needed so your commanded 11.7 is low 10s.

sliderbkt

Can't speak for the OP. But, my LTFTs are turned off, so that shouldn't be my issue. But who knows.

edge04

not sure I understand. Why or how would the fuel trims affect WOT? Fuel trims should go to 0 at WOT and the car is in open loop. remember I don't run a MAF.

I honestly think it is the gauge but I will see when I track lambda error...might just need to dial in my WOT VE table.

I will disable LTFT and see if it makes a difference.

edge04

Well come to find that my VE table is out of whack in the WOT region and running super rich. I will start to pull some fuel out, slowly and see if that makes a difference. Still don't trust the Aeroforce as the most accurate tool so hopefully I have my NTK set up by this weekend.

realcanuk

The aeroforce as a gauge is very accurate. This obviously assuming the WB sensor is good and the settings are correct. I can tell you that mine reads the same as my HPT, which has all been checked against my tuners setup on the dyno. All very close.

edge04

What is "very close"? .5 - .7 off can be the difference between safe and boom. You only have the ability to input data in the gauge regardless of w/b used. I doubt you will ever truly read 5v.

Hope you are right and I will report back after comparing it to HPT

Unreal

LTFTs if positive are still applied at WOT. So if you have LTFTs of +15% it is going to add 15% even at WOT.

edge04

I've heard that before but haven't proven it. How does the ECM know what the fuel trims are doing in open loop?

In any case my LTFT are within 2-5% and negative (pulling fuel) so don't think the trims are the issue.

spy2520

The ECM doesn't know, it will just continue whatever positive trims existed before going into open loop WOT. Like if you're cruising around with +10% and punch it, that +10% will stick during WOT. Negative trims are ignored.

edge04

So since trims are constantly changing, does it use the last recorded value or an average or??

And if trims are disabled, I assume it just uses the existing tables and commanded values?

thanks

realcanuk

It uses the last known value. I run with LTFT off for this reason. If the tune is good you don't need them anyways.