i hope i'm posting this in the correct forum. didnt see a fuel injection section, but here goes....i play with sprintcars. they have mechanical fuel injection and we burn methanol.we use systems called high pressure and a standard.the standard use a normal size nozzle and the high psi uses about two steps down on the nozzle size from the baseline that you start with. basically you are increasing the pressure and forcing the amount of fuel you need thru the nozzle the get the correct afr,as well as,"atomization of the fuel better".droplets of fuel burn. atomized fuel or vapor fuel explodes. gives better throttle reponse and horsepower.the high pressure system is very sensative to outside air temp. very sensative. can this same theory be used on the electronic systems that we all are using on our trucks ?

 

I'm not completely sure of what your asking, but our fuel injection systems use electronic injectors which are controlled by the computer. They can be adjusted in the program to different duty cycles which would allow them to spray more or less depending on a certain AFR you are shooting for. I hope this helps answer your question.

 

lets see how about if you can only get say a 28 lb injector but you need or require a 32 lb for example. can you just increase the fuel pressure to get the afr correct ? or umm to atomize the fuel a great deal more atomized fuel explodes and droplets burn. basically trying to turn the fuel to vapor almost to make it more explosive by increasing the fuel pressure

 

I see what your saying, and I'm not real sure on that. I do know that the injector will flow a bit more with higher fuel pressure. You may try looking in the nitrous section, that would be a good topic for them. I understand the concept of more efficiently burnt fuel/air mixture, but what all would be the gains of this?

 

Maybe you can buy some aftermarket injectors who maybe have a little more research in their design to atomize the mixture better, but as far as just increasing the fuel pressure your just gonna get more flow. The injectors work on a on/off or open/close basis, and would just dump more fuel in per cycle with increased pressure. Or so I'm assuming. What does this accomplish on your sprint cars?

 

they are a constant flow system and the fuel is squeezed thru a orifice thats about.038 in diameter and there is a screen at the bottom. when you force the fuel thru it only so much will go thru no matter what. when the pressure goes up the atomization gets better and like it said vapor explodes and liquid burns. kinda like a tractor and trailer driving down the road with a full load of fuel and it catches on fire the fire department has time to put it out. if he is returning to the depot to fill up its full of vapor and it just explodes. the same theory happens in the cylinders when you increase the fuel pressure. but i have a feelin the injectors on our trucks dont opereate like that.

 

No, they aren't a constant flow design. They open and close in cycles to spray the fuel into the cylinder. The time spent open and the fuel pressure determines how much is sprayed. I don't think it would atomize the fuel any better by increasing the pressure, but I could be wrong on that.

 

I dont see why it wouldn't work. I bet it would be a real pain to make it idle. I don't think your part throttle and cruising would work too well either. What do you consider "high pressure"? GM runs at about 58 PSI. I would think getting a high pressure pump, regulator, and to make it work would be way harder than the minute benefits of the WOT gains.

 

well as far as the pressurre goes.....my car runs a high speed by-pass that is set for 78 psi. but on a very big track such as bridgeport speedway ive had a fuel psi gaugeon it with a needle to see where it went up to and it read 118.