· FF Affiliate
Only way to test WOT A/F is with a wide band air fuel gauge
You posted a graph it shows 02SS11 This breaks down to O2 Sensor Bank 1 Sensor 1 , its shows at WOT .93 that is NOT Voltage that IS Lambda , As you can see in the graph YOU posted that you know nothing about obsessively, you can see it go up when you go WOT and down just after you let off , When WOT your in Open loop , that reading you see if whats in who evers Tune under your Open Loop Fuel Table as a Targeted A/F , it doesnt actually show A/F it shows what your WOT Open Loop Table is in the PCM settings which is .93 in A/F = 13.6 to 13.8 which is far to lean for any Engine under WOT , The reason it shows your in the Tune/PCM WOT Open Loop A/F settings and not Voltage or actual A/F is because it can no longer read fuel trims ( closed loop ) because your now in Open Loop being WOT and it basically turn off the trims and shows the PCM what its Target A/F isMy MK1 has a narrow band upstream O2 sensor. It reports voltage only. No lambda. Where you got that idea, IDK.
I posted my VE test graph and explained it. I didn't ask a question. Uninvited, the busybody people barged in with their unsolicited useless advice.
These comments truly tell me how little if anything you know about Tuning , I gave you all the info you needed and come up with why its like it is at .93 and all you have is it hasnt blown up yet , how can you argue with anyone on here about Tuning if you dont know the basics ... I know , Just to argue !I bought the car new at the dealer and owned it ever since. It's never been modified or "tuned." If the factory got it wrong, it's been that way for the last 20 years. That's hard to believe.
If what you say is true, It should have exploded by now.
If you watch a Vac Gauge ( MAP ) and drive and watch a MAF Curve and drive you will quickly see why MAF is more real world and more accurate to how the Engine/Air is working , MAF is far more accurate for daily driving NA or Boost , cars that do Racing with Boost or a lot of OEM boosted cars use MAP because it sooooo much cheaper to design the software , I dont like the way the ST or the RS drive and with a little work on a few things MAP related you can get them to drive much better but never as good as a MAF TuneAh so interesting on the Tempo piece. It's been a LONG time since I've driven one of those.
MAF is nice once it's dialed in, OEMs have all that time and money to get it done. For beginner tuners (me), I like the MAP based stuff because it's easier to get a car running decent. It's easier to understand with little background (I can understand what KPA is, it's harder to "understand" what load is without having more tuning knowledge). Reading and learning more tuning theory, MAF starts to make more sense and you start to see: 1 - Why OEMs use it 2 - Why it's more accurate and 3 - The methods pro tuners use to dial in MAF transfer quickly and how to calculate the Lambda adjustments needed vs guessing or blanket adders.
Greg Banish's books on tuning have good examples right from SCT PRP to show how to tune a variety of these tables, and the theory as to why.
I said YOUR Numbers were to lean , the Numbers in Blue/Red are 45% TPS WOT Fueling and I have WOT Open Loop TPS % Set to 55% to go Open Loop Fuel , Now taking all that into the Mix that .834 does not mean his Open Loop A/F Fuel will be 12.4 the PCM / ECU also factors in Maf Transfer Functions as well as ECT , IAT and about a dozen more Factors but they have little bearing on the final A/F , Its Mostly the Open Loop Tables and Maf Transfer FunctionsEarlier you said those numbers are too lean for WOT. You're not making sense.
No one is taking into account that at WOT ( Open Loop Fuel ) and the WOT part is what I have been talking about this entire time ,the O2B1S1 is turned off , it cant just shut off so it will mimic whats in the Table I posted ( Base Fuel Table ) regardless of what the actual A/F is , That isnt Voltage in that log at WOTIf that PID is narrowband voltage, someone correct me if I'm wrong but ~0.5V = 1 lambda. Once you deviate from stoich, the voltage really only tells you if it's richer or leaner, not by what magnitude. The sensor is accurate at stoich.
I would have to test that , I will log NBO2 Voltage on one and see but I think its going to show that the Voltage reverts/mimics to what the Base WOT Fuel Table is not what A/F is or what the A/F Voltage would be compared to a A/F gauge , I think doing this keeps the PCM from trying to make any changes from the NB02 , I will seeNBO2 DOES measure O2 WOT.
The PCM does not use it. The reason it isn't used is as I stated earlier about the switching/frequency of the measured values being more important than the voltage output. In high exhaust flow situations the NBO2 can not switch fast enough to be reliable. Therefore it's not used for PCM input.
Because you dont understand whats happening doesnt change the Fact of how it works 0 volts would be anything above 15/16 A/F I think it is and when in decel you will see 18`s A/f , letting off the throttle your in Fuel Cut / Decel Mode , there is no off throttle Open Loop , Open Loop occurs 2 ways , when you first start your Engine and when you exceed the TPS % set to go Open Loop WOT , There is no closed Throttle Open LoopMy graph disproves that near the 20 second mark. I went no throttle for a few seconds, to slow down.
Just felt this needed repeating , amc49 you sent this to bcat loved it LOLThat may be so but in this case I disagree, the diagnosis fits your general behavior to a T.
From your own link, which you have disregarded in certain parts to even now be guilty of said thing......
'Passive-aggressive behavior is characterized by a pattern of passive hostility and an avoidance of direct communication. Inaction where some action is socially customary is a typical passive-aggressive strategy (showing up late for functions, staying silent when a response is expected).'
That's you or I ain't me. You endlessly post links as 'proof' but most of the time they blow your boat out of the water.
We understand your disdain for reality being it is so inhospitable to you.