ok so ive seen somethings that were saying that buy putting new injectors into the truck will increase the mileage. I was wondering if this is true i mean i know that injectors are increasing fuel, but im just curious, also if it does what size of an injector will increase it? and is it safe to run say with a Bullydog Power Outlook or a Quadzilla XZT?
thanks

 

Its all about efficiency of the fuel delivery and the way you drive your truck.

New injectors may increase mileage back to a good average because they are clean and have a good delivery pattern, promoting fuel burn more efficiently.

Are you looking for improved fuel economy over a 20-22 mpg highway average? Or trying to get a little more out of a modified truck with oversized tires and a chip?

 

Well overall I'm trying to go for a better fuel economy, ya I figured by putting new Injectors that they would be better cause they are clean, I run my bullydog on level 1 and that's bout 11 xtra horses but my mileage went up and. I was getting 18mpg doing 80-90 back from the coast but I'd like to see. Bout boosting it, and my brother is going to be stacking a quadzilla with a flash pack junior thinking he's gonna get better mileage and that's when we came along where someone was running 90 horse Injectors and getting better mileage si I was curious and if u waa able to run em with my bully dog

 

Maybe try the performance section as I haven't run injectors or a chip yet.
18mpg at 80 is pretty good, I'm getting about 11-12 at that speed when I can open it up.
I think you may want to accept whatever you get and understand that you can control it by your driving style. Long trip good mileage, around town heavy foot = less mpg.
Its gonna be a treadeoff no matter how you look at it IMO.

 

Here is why slightly bigger injectors help mileage.

They can, when required, deliver more fuel per unit of time.

To make it easier for some to understand, look at it this way.

If it needs a gallon of fuel to make the power requested by your foot, a small injector will still be injecting at the bottom of the stroke, where a bigger injector will be finished injecting when the piston is still near the top where the heat is, and the leverage to turn the crankshaft.

 

oh ok ya that makes since

 

Wow, that made no sense to me at all.

A higher delivery injector delivers more fuel. This is fuel that would have passed through the return lines back to the tank. In theory this drops the delivery pressure slightly, but in reality it's an irrelevant drop.

The reason gains can be had from more fueling is that you can keep the engine at a lower rpm. If you already have a fueling chip, you likely will see no efficiency gains. Rolling coal is inefficient with a turbodiesel-if the turbo can't keep up you will be wasting fuel.

When I did injectors (100hp tips) I gained about 1.5mpg. 4" exhaust netted another 1.5 to 2mpg. I haven't calced since I put in the timing box, but I doubt I got much more.

I'd venture that if I'd done the box and set it high, I'd have netted more than the injectors gave me since the EZ changes the map to fuel at lower rpm, and additionally advances the injection timing.

 

I will say I'm not a racer and my plan has always been to modify for mpg BUT w/that the mods I have completed also gained HP. It's not one mod but a combination of improving air flow in/out, timing, the right injectors and your right foot.
1. air intake and exhaust improves flow
2. increasing the timing from the use of a programmer
3. injector hole count and spray pattern
4. control of your right foot (easiest and free).

I know the overhead monitor is not 100% accurate and to use it as a basis for simple comparison and w/the mods listed in my sig my mpg went from 19.5 to 25.5 mpg. I'm guessing hand calculated about 24....so I'm definately happy w/what I've done and off the record finished modding.

 

so far i have 2 out of the 4 lol i already have a cold air intake and a 4 inch staight pipe exhaust, and a bully dog that does the timing, now injecter hole count and spray pattern what do you mean? i dump sea foam into my tank every so offten, and im getting better with the right foot, but i also do a lot of in town driving now so my mileage is bad, when i went to the coast from here in san antonio, tx, i was doing 80-90mph and got round 18 mpg so it wasnt too bad

 

The number of holes makes little difference. It's the volume of fuel delivery which is set by the amount of restriction in the tip-size of holes and number of them. Some claim one tip/injector runs "hotter" than another. This IMO is bogus. One may deliver more fuel than another, but if it's running too hot, it's because your air delivery is falling behind due to preturbo exhaust leak, air charge leak, or inadequate turbo air delivery.

Having said that, I would be very cautious adding sticks along with a small box on the stock transmission. You might get away with 50 hp tips, but maybe not. Bigger will almost certainly roast the transmission. A Torque converter and Valve body can make your stocker hold up, though. But I'm not an auto guy, so my info on this is should be double checked.