Originally Posted by Track

New rule. if you have more negative props than posts...BANNED!

Originally Posted by Hinano

That's the thing.. I'm not really broke. Also, this is a hobby of mine. Let's just call it a $500 budget for power.

Originally Posted by Track

1) open/closed loop can be different. I think the general consensus is an open loop system doesn't use the o2 sensor to adjust AFRs anymore. Whether the MAF and/or other sensors are used is anybodies guess and probably dependent on application and manufacturer. It seems earlier testing would indicate the MAF is not being used and/or ECU doesn't fully compensate for additional airflow due to mods.

2) AFRs tend to get much richer vs closed loop. In closed loop the ECU will run you at/close to stoich. In open loop its some AFR value that is much richer than that. a stock miata might run below 12. if you run enough mods, it might run at 13? You could put a turbo on there, add no extra fuel and run at 17 if you like. I also heard that moving the injectors to the exhaust side has some cooling benefits.

Originally Posted by Steve in VC

Closed loop is controlled by the front O2 sensor. The A/F will cycle around 14.7, because the narrow band O2 is cycling between rich (~1V) and lean (~0V). When the O2 is rich, the injector duty cycle is reduced (less fuel), when the O2 is lean, it increases (more fuel).

The reason the O2 / injector duty cycles, is there is a lag from the time the injectors fire, and the exhaust gas reaches the O2 sensor. You can't adjust the injector duty cycle any faster than that.

Above a certain RPM (my car, that is about 4000RPM) the engine goes open loop. The air is monitored by the AFM, and the injector duty cycle set accordingly - usually a bit rich (much safer than a bit lean).

Bigger injectors, or a rising rate FRP will remain in the closed loop up to 25% more fuel, then the ECU runs out of range. Open loop, the duty cycle is based on the air and the stock injectors, I would expect the car to run rich.

Originally Posted by 18psi

I'm almost positive he is just trolling

Originally Posted by concealer404

It has nothing to do with being a control freak or not. Are you sure you aren't just throwing around phrases and/or words in order to just vomit something into an internet post?

You have to see how frustrating it gets when you come on here without knowing much, and refusing to do any sort of research to gain any small modicum of understanding that which you're trying to discuss, right? We will not spoon feed. Help you help yourself.

Originally Posted by fooger03

“A mind is like a parachute. It doesn't work if it is not open.”
-Frank Zappa

Originally Posted by Hinano

Your point is valid except that I am not not doing research. I am doing allot of research and am trying to learn as much as possible as fast as possible. Control has to do not with requesting me to do my own research, that is valid. Control is insisting that other should follow what you say, simply because you and or others believe it is the right thing to do.

The quotes above have to do with supporting a humans curiosity and drive to fully understand and think for themselves rather than just accepting what others say. This is a individualistic, and VERY beautiful ideological character of American culture.

Correct me if I am wrong but a online forum = socializing, learning and teaching

Originally Posted by Leafy

You are very obviously not researching in the manner which we call researching, which is reading things online without asking questions. We dont just hand out answers to rudimentary questions which would have been answered if you would do a short google search for the answer.

Originally Posted by 18psi

Guys,


What is the meaning of life?