Im reading that Rocks and Gator are maxing out their fuel systems, since our fuel systems have a return line why not add a adjustible fuel pressure regualtor. The computer has the ability to lean out fuel trims, it just doesnt have the ability to add fuel when fuel isnt there. What Im wondering is why cant we just crank up the base fuel pressure which will also crank up the fuel pressure at WOT. Then instead of a 42# injector maxing out at 470ish RWHP you have the ability to go all the way past 500RWHP. As long as you dont go above 80Psi in Fuel pressure you dont have to worry about the injector going static. Before the Lightning came out the biggest injector available was a 36# injector, I saw several 5.0s and Modulars make 500RWHP with 36# Injectors, our trucks should be no different.

 

part of the problem is that our regulators are made onto the fuel rail.

I suppose that you could however just remove the vacuum supply from the existing regulator and then add an adjustable regulator in line at the back of the rail.

or replace the entire fuel rail...

 

raising fuel pressure won't do anything if you are out of fuel pump. If you are out of injector you can try and find a way to put an adjustable fuel regulator in place. IMO it would be far easier to just buy some larger injectors. They go all the way up to 60's now.

Brian

 

I figured smarter people than me tried to max out the stock system and they went to larger pumps/injectors.........

So Iam going that way. Besides, I'll need to sooner or later

 

you can get 42lb injectors there with 80psi, but the spray pattern is not going to be optimal.

 

Chris- Im sorry, I forgot to say 96-97 Mustang Fuel rails work and the regualtor comes off.

Brian- I agree on the part about running out of pump but the twin pumps the Lightning has will deliver more volume than what we have dealt with in the past. The downside to running a big injector in fuel ecomony goes to absolute ***** and driveability is not the same as with stock injectors. The big squirters have a crappy spray pattern when you dont need all that extra fuel. Thanks for commenting and please continue in this thread, even if you need the dual 255 pumps, its better to swap pumps than to have to go thru all the garbage envolved in swapping to bigger injectors. With a Pump upgrade and new fuel regulator, I see no need for a retune, the computer has the ability to adjust fuel trims.

 

I went duell 255 pumps and 55 lb injectors.

Also, JDM make a manualy regulated fuel rail.


Suavy

 

HI!... All I did was to get a fuel rail off a "98" F-150 5.4. It has a BOLT-ON non adjustable FPR. I then bought a AEROMOTIVE billet FPR and bolted it on. Here's a few pics :

 

You can add a regulator on to the return line. This setup has the added safetly feature of not allowing you to lower the fuel pressure below factory pressure.

But like Brian said, this will do you no good. The restriction is the flow from the pump. Increasing the fuel pressure will only amplify this problem because as fuel pressure increase flow decreases from a fuel pump. If you were injector limited increasing fuel pressure would help you, but still wouldn't be the right way to go about it.