Do you have facts to support that opinion? Love to see them.

Yes, the fuel system is stock, so the MAF is being used. Before I install my 408, I am building, I will have larger injectors and a MAF sensor that will be able to meter the additional air. Yes, the tune will have to change.

 

The O2 sensors are a watch dog sensor that sends a signal to the ECU. The ECU uses that information to confirm if the system is working properly. In a perfect world, the sensors would just confirm to the ECU everything is ok. Because it's not a perfect world, there are always something that effects the mixture. Small unmetered air leaks. purge system, wear/tear of the fuel injectors, fuel pressure, etc. If there is no signal, the ECU thinks that everything is OK and will no make those slight changes in the fuel mixture.

If the O2 sensor was the primary sensor to control the fuel mixture, it would be after the burn before any correct and the driveability would be terrible. All the sensors that determine how much air is being taken is are before the air actually passes the intake valve, not after. The ECU determines the amount of air and quickly determines the amount of fuel that will pass the fuel injector.

Google is your friend.

 

Quote:

Originally Posted by 1Butcher

Google is your friend.

Yes it is -

CLICK HERE - https://repairsadvisor.com/blog/how-...-sensors-work/

 

Quote:

Originally Posted by 1Butcher

Do you have facts to support that opinion? Love to see them.

I believe she is describing a boosted engine.

 

Might be, but I still would love to see some facts to support that. I suspect the ECU knows how efficient the engine is and how much air [MAF] it's taking in so knowing what the MAP is, is not that important. Sure, helpful, but not that important.

No, I'm not an engineer nor have any experience programming fuel systems. Heck, I can barely figure out how to raise my idle with the Tweecer.

 

https://www.motor.com/magazine-summa...rner-dec-2016/
heres a quick link, basically because the moment your supercharger is making your intake positivie its not the most reliable, unless the PCM is already applying enrichment based on the TP rate of change and raw value TPS sensor

 

INFO from above REFERRING URL
Further info can be found in ECO-BOOST LITERATURE

 

That link does not apply to my truck. I only know of one engine that has a MAF sensor AFTER the supercharger/turbo.

I did not read the entire article [I'm too busy] but I lost interest when I read "Positively pressurized (turbocharged) engines generally have turbulence in their intake manifolds. Unlike mass airflow (MAF) sensors, MAP sensors are not subject to measurement errors due to intake turbulence. MAF sensors depend on laminar airflow in the sensor bore; the same amount of air is flowing over sensor as over the entire bore."

The engines that I work on have the MAF sensor first. Well, actually after the air filter, but way before the air gets tossed around. I've seen what happens when the air filter assembly is not attached properly, the engine runs poorly. I don't know of any manufacture that puts the MAF sensor after the throttle/turbo. I do know that MAF sensors on diesels are used to determine the amount of air for the EGR operation, not necessarily for fuel delivery.

The article is misleading at best. Sometimes too much information is just confusing. Especially when people don't have a full grasp how everything works.

My MAF sensor [as well as most] measures the amount of air passing before that air passes the intake valves or throttle body. My EEC-IV is not designed to run on boost, but so far, I'm not looking for eking out the last HP. I don't have the talent or the tools to do that. My opinion is that the SD systems are prehistoric. I know there are some advantages over the MAF systems, I cannot deny that. For the average street car, I believe a MAF sensor fuel system is much better.

 

im not certain we are on the same page here. I just quick found that link. it wasnt meant to be 100% about your application

to my understanding , after looking more, the fords with supercharger that have maf seem to have a map but its only for failure events and getting a BARO before the engine runs

 

Probably true. In order for OBD2 to work, the computer needs to figure out if the system is working properly and that the computer can test for that. Having a MAF can certainly do that function.

Boeing had some planes dive into the ground because the one and only air speed sensor read poorly. Since the computer was designed to handle a stall issue [nosing down the plane to pick up air speed] the planes did what the computer made them do. If only Boeing put in a second air speed sensor so the computer can see that one is bad, could have saved many lives. As far as I am concerned, this is absolutely common sense and if I ran the world, someone would be in jail. Killing all those people certainly deserves the death penalty. There is no excuse for that negligence with today's technology.