Lets talk fuel atomization on fuel injectors upgrades

[dre256]

Ok here it is, I have been learning over the last few days about really playing with fuel injectors. First and formost I know the G6 fuel injectors on the pounds are plenty for the engine 3900. I forget how much the G6 3900 fuel injector is, 24-25 LBS if I remember correctly? I do not know the PSI maybe 49? Woundering if we can capitalize on that?

Let me start with an example, my 4.0L jeep has a 21 lbs injector at 39 PSI. If you want more power with mods you can put in Ford 24 lbs injector at 39 PSI and you will lose MPG untill you have a ported head then MPG back to where they where. Now on a plain jane stock engine or some mods you can go to a Ford 19 lbs injector at 49 PSI. Because its a 4 nossle injector at higher PSI MPG and HP pick up.

So with all that said as a back ground, if our G6 3900 injectors are say 25 lbs (but still not sure on the PSI, I am guessing 49?) what about swaping in the 98 LS1 injector for more HP and fuel econmoy because its 25.2 lbs but its at 58 PSI. The incressed PSI would alow the fuel to atomize (burn) more effecently in the cylinders so we would pick up MPG and HP.

Am I on the right track or way off?

2nd, anyone has the exact 3900 pound and PSI ratings?

[1BADG6GT]

Re: Lets talk fuel atomization on fuel injectors upgrades

I like where this is going... hopefully SOMETHING works to get better MPG's...

[BORN2SKI]

Re: Lets talk fuel atomization on fuel injectors upgrades

I like where this is going... hopefully SOMETHING works to get better MPG's...

Screw MPG's, I want more power!!!!

[1BADG6GT]

Re: Lets talk fuel atomization on fuel injectors upgrades

Im just being realistic... sure if it adds HPs then I'll take it as a bonus...

[WoodburyMan]

Re: Lets talk fuel atomization on fuel injectors upgrades

I might be saying something stupid since I don't know to much in this area... but don't higher pound rating injectors just mean they have the ability to squirt more fuel in at once?? (Ex I think the stock GTO's are like 32#/hr, and Magnacharger kits come with 60#/hr injectors..) I heard 32#/hr injectors in the GTO is good up until 450-500rwhp, after that it's running out of Fuel. .If they are like 24#/hr Injectors in the G6, and even at peak power/rpm your pumping say 20# i dont think it's gonna do much for fuel economy or power...

I know Chris knows a shitload more about this stuff... he had fuel issues with his G8 GThe S/C'd. Or was it GXP?

[BORN2SKI]

Re: Lets talk fuel atomization on fuel injectors upgrades

If we could get more hp AND more mpg's, that would be awesome!!
Maybe an electric supercharger?

[GT-R]

Re: Lets talk fuel atomization on fuel injectors upgrades

Changing out injectors is going to require special tuning. Going too small and raising the pressure and increasing the duty cycle which heats them will shorten the life, going bigger is waste unless you're doing some serious modding. If you go too big, you'll be removing them, as it can become untunable. If you want to experiment, just use an adjustable regulator with the stock injectors.

Also, there are different styles of injectors, if you have the disc style (self cleaning) raising the pressure too high will cause them to lock up (NOT A GOOD IDEA)

[dre256]

Re: Lets talk fuel atomization on fuel injectors upgrades

I might be saying something stupid since I don't know to much in this area... but don't higher pound rating injectors just mean they have the ability to squirt more fuel in at once?? (Ex I think the stock GTO's are like 32#/hr, and Magnacharger kits come with 60#/hr injectors..) I heard 32#/hr injectors in the GTO is good up until 450-500rwhp, after that it's running out of Fuel. .If they are like 24#/hr Injectors in the G6, and even at peak power/rpm your pumping say 20# i dont think it's gonna do much for fuel economy or power...

I know Chris knows a shitload more about this stuff... he had fuel issues with his G8 GThe S/C'd. Or was it GXP?

You are right on the pounds/hr but am talking about trying to stay in the same lbs of the stock injectors but going with an injector that has a higher PSI.

[dre256]

Re: Lets talk fuel atomization on fuel injectors upgrades

Changing out injectors is going to require special tuning. Going too small and raising the pressure and increasing the duty cycle which heats them will shorten the life, going bigger is waste unless you're doing some serious modding. If you go too big, you'll be removing them, as it can become untunable. If you want to experiment, just use an adjustable regulator with the stock injectors.

Also, there are different styles of injectors, if you have the disc style (self cleaning) raising the pressure too high will cause them to lock up (NOT A GOOD IDEA)

But what do you think of finding an injector thats the same size of the G6s but has a higher PSI?

I would be willing to try an adjustable fuel presure regulartor and turning up the stock injectors a tad as that would be the most ideal I would think on mainly stock engines but is there even an adjustable fuel presure regulator avaible for the G6?

[GT-R]

Re: Lets talk fuel atomization on fuel injectors upgrades

Injectors are sold based on size @ a rated fuel pressure. The psi. is based on the regualtor setting. In order to raise the fuel pressure and maintain the proper fuel requirement means that you went with a smaller injector, and that brings us back to increasing the duty cycle. While this might atomize the fuel futher, there are other factors at play as well, such as port configuration, and the distance between the injector and the valve.

An adjustable regulator for the G6 would have to be either fabricated or adapting an aftermarket regulator onto the fuel line.

[dre256]

Re: Lets talk fuel atomization on fuel injectors upgrades

I see what your saying, your conserned about the duty cycle and maxing them out. And locking up a fuel injector isnt a good thing lol. Is there any way to figure out how much duty cycle is being used then might be able to figure out how close the stock injectors are from max?

[killiger2009]

Re: Lets talk fuel atomization on fuel injectors upgrades

I might be saying something stupid since I don't know to much in this area... but don't higher pound rating injectors just mean they have the ability to squirt more fuel in at once?? (Ex I think the stock GTO's are like 32#/hr, and Magnacharger kits come with 60#/hr injectors..) I heard 32#/hr injectors in the GTO is good up until 450-500rwhp, after that it's running out of Fuel. .If they are like 24#/hr Injectors in the G6, and even at peak power/rpm your pumping say 20# i dont think it's gonna do much for fuel economy or power...

I know Chris knows a shitload more about this stuff... he had fuel issues with his G8 GThe S/C'd. Or was it GXP?

ive heard this also from my uncle and grandfather (built the cobra jet motors back in the day) i mean u need bigger injectors wen u s/c or turbo it because u need to.....but i see where ur coming from wen u say itll spray more n burn better tho....so idk about the ls1 injectors but wat if we used bigger cobalt ss ones? they just seem to be better for our motors imo...possible fit better

[GT-R]

Re: Lets talk fuel atomization on fuel injectors upgrades

Is there any way to figure out how much duty cycle is being used then might be able to figure out how close the stock injectors are from max?

Chris or who ever programmed your ecm should know that based on the data log. Also note that the duty cycle will be different between a stock and custom programmed ecm. If you have a custom program, changing injectors or raising the fuel pressure may have a negative effect on the way your engine runs, since it was programmed based on a stock configuration.

[killiger2009]

Re: Lets talk fuel atomization on fuel injectors upgrades

u know that does make more sense if chris could tune it to push more fuel then mayb thats the only way

[Metalhead852]

Re: Lets talk fuel atomization on fuel injectors upgrades

Chris or who ever programmed your ecm should know that based on the data log. Also note that the duty cycle will be different between a stock and custom programmed ecm. If you have a custom program, changing injectors or raising the fuel pressure may have a negative effect on the way your engine runs, since it was programmed based on a stock configuration.

^ This. What size are the stock injectors for our cars? I would imagine GM uses the same ones for all of our engine options. I'm guessing 330 maybe 410 for the 3.6? I have not done much research yet for my car since I've been focusing mostly on the other car.