I thought the injector "size" was a rating of how much it flowed in 1000 shots? So how is ine injector spraying that much fuel in 3ms? In one cylinder?
This is a rating of the max potential of the injector. It is the max fuel that the injector can hold given 1000 shots... Max ICP, Correct Nozzle size, and fuel pressure allowing. But it is not just a given.
PS... 3ms of PW would more than likely blow your truck up.
Think of an injector as a giant needle syringe from the doctor.
The first number (155cc, 175cc, 190cc etc...) that is how much fuel the injector can hold. Kind of like how many cc's fluid you can hold in the syringe from the doctor. (in 1000 full complete shots)
The second number (30, 75, 100, etc...) that is how big the nozzle size is over stock. Basically it is how much faster the fuel can be dumped over stock. Think of this as the needle gauge (size of hole in the needle). The bigger the gauge the more fluid you can dump in the same amount of time.
HPO, ICP, ETC... this is how much oil pressure you have behind the injector. This could be symbolized by how hard you press the syringe with your finger... or hard hard you bang it with a giant hammer The harder you hit it then the better your injection pressure and faster you dump fuel.
PW, Pulse width, 2.4ms, etc... this is how long the injector pulses for, or how long it has to dump fuel. This is kind of like how long your finger can push on the back of the syringe. The longer you push the more fuel comes out.
So why not just upgrade the size of the injector body without upgrading the nozzle size... well at high rpms the motor will be spinning so fast that there will not be enough time to dump all the fluid. That is why you upgrade your nozzle size. So you can dump more fuel in the same amount of time.
Why can't you just open up the pulse width long enough to dump all the fuel... well there is only so much time to play with. You don't want to advance the timing too much.
So why not just put the largest nozzle possible? Is there a problem with dumping too much fuel? Well the pulse width can only be adjusted so much. You can't just turn off the fuel. With too big of nozzles you will be dumping way too much fuel when cruising and towing. This will cause much higher egts
With all that said. You could essentially get a 190cc injector with a 50% nozzle. At full pulse width you will be able to dump all of the 190cc of fuel. But if you back off the pulse width through tuning you can dump slightly less fuel. Like 175cc or 155cc
On the other hand if you put a 150% nozzle on a 190cc injector (190/150) then at full pulse width you will still only dump 190cc of fuel. You cannot just turn down the pusle width because we don't have access to the tables. You have to adjust other parameters to try and manipulate the pulse width. Basically you will not get 190/150 to turn down enough to run very well. They will be hot and smokey and less efficient. you cannot get a 190/150 to run like a stock injector and still have power and driveablity up top. With larger nozzles you will be dumping fuel more like pouring a bucket on a fire. This results in a slower less controlled, less efficient burn. What you want is to atomize the fuel. (most pressure possible through the smallest nozzle) That would be like using a mister to equally spread out the fuel over the fire. The burn would be quicker, more controlled, and equally spread out. Thus resulting in more power. This is why many people with 300/150 injectors have a hard time with egts and hazing when driving around. There is just no way to turn down the fuel enough to run right and still have descent power up top.
Hope that helps put us on the same page.
