Originally posted by mpg9999 didnt. past tense. I see that you understand what he was saying now. And theoretically his idea works, although I dont see how he is going to be able to match up the injectors and MAF.
no theoretically his idea doesn't work, that's what I'm saying, maybe in a world without ECU's but then there'd be no MAF's woudl there?
Ok. Let me try to explain this. The ecu sends an electronic signal, or injector pulse width, to the injector which will determine how long it stays open, which, among other things, determines how much fuel will flow into the cylinder. One of the main things that determine injector pulse width is the MAF voltage. If he upgrades to a larger MAF, more air will flow in then the ecu "see's", so it would run lean. However, if he ran larger injectors in conjuction with the larger MAF, the injector pulse width would remain the same, but more fuel would flow threw them since they are larger, theoretically offseting the extra air from a larger MAF. The problem is finding a MAF/Injector combination that will compliment each other. Please, correct me if im wronge, it wouldnt be the first time.
Originally posted by mpg9999 Ok. Let me try to explain this. The ecu sends an electronic signal, or injector pulse width, to the injector which will determine how long it stays open, which, among other things, determines how much fuel will flow into the cylinder. One of the main things that determine injector pulse width is the MAF voltage. If he upgrades to a larger MAF, more air will flow in then the ecu "see's", so it would run lean. However, if he ran larger injectors in conjuction with the larger MAF, the injector pulse width would remain the same, but more fuel would flow threw them since they are larger, theoretically offseting the extra air from a larger MAF. The problem is finding a MAF/Injector combination that will compliment each other. Please, correct me if im wronge, it wouldnt be the first time.
ok let me explain this, the MAF is an electrical device, it measures electrical signals, when you upgrade it it does not recognize these new signals. in order for that to happen you need an ecu upgrade... same goes for the injectors, they will not open properly without the ecu being reprogrammed!!! you cannot just plug things in and expect things to work the same! do you understand?
Why wouldnt the Injectors still open up (as long as you use the proper impedence and side feed) if you went to a larger one without upgradeing the ecu? IM me on aol. My sn is mpg9999
The pulse width is not constant with every injector, you're not going to get more fuel just by plugging in a larger injector. Same as the MAF.
The injectors would still open up, but for the wrong length of time delivering the wrong amount of fuel so it'd run like crap... like I said before, it won't work unless you like a rough ride.
Im pretty sure your wronge. If you went and replaced the stock sr20 injectors with 370 cc's from a Q45, you would run rich. Again, I could be wronge, but im pretty sure thats true. And are you gona IM me? thanks.
I know you're not trying to be hostile, but the point is made and you keep wanting to know why? Well I don't have the math to prove in every situation you're wrong but the old saying goes that even a broken clock is right twice a day right? Same goes for what you're suggesting, I'm sure at a certain rpm it will produce the proper ratio in fuel and air and it will be great but what the hell is the point in that?
Alright. Well im am niether convinced nor dissuaded that it wont work throughout the rpm range. When I see evidence (that obviously niether of use have) then I will be convinced. I will try to do some research on this.
I don't understand why you think this would work just as well as an ecu upgrade... why did they even come up with ecu upgrades then? Why isn't everyone doing this if it's just as easy as compensating larger injectors with a larger maf? Wow so simple right?
It will turn on and it will run but it will not develop nearly as much power as with an ecu upgrade and it will run rough because the air fuel ratio will never be right except for your one rpm where it might cross the threshold.
Originally posted by James why did they even come up with ecu upgrades then? Why isn't everyone doing this if it's just as easy as compensating larger injectors with a larger maf? Wow so simple right?
Maybe no one does this because no has tried it. If you haven't ried it or know some one who tried it then you cannot say it can't be done, you can only say you don't THINK it can be done.
What do you think JWT will tell you you don't need their ECU if you just use these injector and this MAF? Who would give them a dollar after that?
There was a whole thread about ECU tuning and after reading that I believe it's possible. I could'nt figure out the math but why couldn't it be done. When you switch a MAF or injectors they just change the FUEL map to compensate they don't re-invent the wheel. The O2 sensor will also help the computer reprogam itself.
Theoretically I believe it's possible, BUT I believe JWT is the only one that will be able to figure the combination and they will never tell. Read this and you will see it can be done
Originally posted by James I don't understand why you think this would work just as well as an ecu upgrade... why did they even come up with ecu upgrades then? Why isn't everyone doing this if it's just as easy as compensating larger injectors with a larger maf? Wow so simple right?
It will turn on and it will run but it will not develop nearly as much power as with an ecu upgrade and it will run rough because the air fuel ratio will never be right except for your one rpm where it might cross the threshold.
What isn't possible? I said it will run and turn on didn't I???
I dont think this will work as well as an ECU upgrade. An ECU upgrade would definatly be the best thing. But, I think this still might work, and not just at a specific rpm like your saying.
so what does that mean. I always wanted a car that turned on, maybe next year I'll have one.
after it turns on then the ECU will begin to compensate and soon it will learn to work, maybe not 100%, but it will learn. but you don't care any way so whatever.
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