92smokin blacky

I am trying out/borrowing Terry's (crewcabxlt) 5x13 or 14 ??? injectors.They are custom injectors that were built for the moonlight pulling truck back when it was a VE. I pulled out my PODs and put these in the other day, I didn't expect too much of a difference since PODs are supposedly 4x14s. First thing I noticed was that they ran a lot cleaner than pods, my idle dropped (still need to adjust it) and he said it would slightly advance my timing from the different pop pressure so it does seem to sound a hair different at lower rpms. Power feels about the same, just doesn't haze while taking off slowly and getting into the boost like the PODs did. But at WOT it feels about the same, still hazes just a bit at 50 lbs of boost just like the pods did and I'm still runnin 50 lbs of boost max so its like I'm not getting much more or any more fuel. Egts seem about the same, maybe a bit cooler than pods, but it definately cools down a lot faster to shut down with my turbo timer than the pods did. It runs good with these injectors but it ran good with PODs as well. I think I am going to dyno twice in a few weeks and swap injectors and see the power difference between the two.

But my question is would going to a much bigger injector give me much gain??? I was talking to a friend of mine and told him that I didn't see much gain from these injectors and he said its cuz I cant supply the fuel with VE pump. He's a p pump guy so thats probably part of it, but is this partly true? Say if I went to a 6x18 injector, would I see any gain or actually lose power with a turned up 12mm VE? would it not be able to supply them with the right amount of fuel/pressure to use them to their full potential? The way I see it the smaller the injector the more pressure you'll get out of the holes and better atomization. Maybe thats why these PODs are running great in my truck, i don't know. I'm just kinda curious about this and if a bigger injector is the way to go or stay in the smaller/mediate size and run a 14mm pump to give it lots of flow and pressure? I'm on one of my curiousity mindsets again

maxwellp

Good Topic, I have a 01 that I got with 125hp Jammer injectors in it. What does that really mean? Each one can fuel up to 125hp? I think they are to big, It will make lots of smoke.

jimbo486

The HP number injector builders give typically mean how much over stock they COULD make. They don't guarantee you'll see that increase, of course, and for good reason.

fatt

I saw recently that someone claimed PODs are a 4x16. If that's true, that would make them close to the same size as the 5x14 and explains why you didn't notice much of a power difference.

Crossy's son

The injector chart says Pod's are 4x15 and stock Non i/c injectors are 4x13.

It used to be 4x14 and 4x12.

I really don't think anyone knows, I did see someone on here said pods are 4x16 not too long ago But i don't think it was a reliable source.

Knowing Pod's, 2 of the holes are probably different size than the other 2 LOL

fatt

Ok so I searched and found who said it. https://www.dieseltruckresource.com/...n-t292901.html However with a quick google search I couldn't find anything to back that up. So who knows what they are?

stillsmokin209

Weston builds my injectors for my p pump truck and will be amking a set for the 90'. He told me plain and simple that Lucas lists the "POD" as a 4x.016, right there in their nozzle guide. I am going to beleive him on this as he has access to anything injector related.

93Fury

I noticed a huge gain from my POD's to the 6x16's. That was on the stock charger, the VGT is a totally different world. And, when i get my hands on the II VGT Hybrid 64/71, it should be amazing. Just my .02 from personal experience.

92smokin blacky

I remember seein POD's on the chart as 4x14s so thats what I've been callin em. I could believe that they are 4x16s cuz mine have been making good power, all I know is when I pulled them out to swap these in the other day I could look through one of the holes and see daylight from the hole on the other side since the holes are in a square kinda. So they are decent sized holes.

It will be very interesting to see the hp difference between the two when I dyno in two weeks. I'm thinkin the 5x?? will maybe give me a bit more from a hair more timing, the cleaner burn and they also have the thinner washers... but the Pods may be right there with em too since at 50 lbs of boost, all that air cleans up the fuel nicely. It will be very interesting to see.

So lets get back on topic... so would going to a BIG injector be worth the money and hassle? Or should I work on the 14mm pump more for more pressure to the smaller injectors I have? I think these PODs have a lot more potential yet if you ask me, I'm sure I can break 400hp easy enough with twins and lockup...

pulltilbroke

Just get a set of biguns cut.

BC847

The tests will be invalid if the POP-pressures are different.

An injector with a lower POP-pressure will open and begin flowing fuel earlier, and close later, thus stop flowing fuel later. You could say it's window of fuel flow is wider, than an injector with a higher POP-pressure.

The above assumes the same injection pump is used when testing the two different injectors.



Also keep in mind: The infernal combustion engine works by expanding air, with the addition of heat. Air is the working medium, not the fuel. Certainly one may see more apparent power with merely dumping in more fuel, but let's face it, 2000*F combustion temperatures is hotter than 1600*F combustion temperatures. More heat in the given air, will make more power. It's stupid hot, but yeah, it makes more power . . . . till mess melts.

Consider this: If your mess is blowing black smoke after the turbo is fully spooled, you need more air to make more power.

Case in point; Not too long ago, I ran some standard DDP4s with an HX35/hybrid over the HT3B . . . . OK, fine. I then slipped in some Shied 6x.016" EDMs.
My ET at the track actually didn't improve any, all things considered. but folks were quick to point out, I was now smoking like a coal-fired train.

OK.

I then turned around and added an aftermarket cam along with a much better intercooler. With that, my boost went from 65psig DOWN to 55psig. There was now more/cooler (denser) air flowing through the engine. As such, my ET dropped a solid 2 tenths of a second. More power using the same amount of fuel.
Later upgrading to a better secondary, had the ET drop even more. Again, more air with the same amount of fuel.


> The point here is that adding more air, made better use of the existing fuel the injectors were providing. Again, it's the hot, expanding air that pushes the pistons. Not the fuel.

> If your mess is blowing black smoke after the turbo is fully spooled, you need more air to make more power.

jimbo486

VERY well stated, David!!