Glad that put ya on track. That added power you feel…running @ 2psi on the 5/16 fuel line — she has the better LP & larger line the whole way, you are gonna feel that bump in power again even if you don’t change the turbo control yet. You felt roughly 65% and the other 35% is trapped in the small line and low flow.
When you do this next move, something to look into is how the big boy systems set up so that there is a major fuel return going through the FASS or AIRDOGG LP the entire time your engine is running. It supplies the engine but pushes way more than it needs so it is constantly filtering the rest of the fuel and “polishing” the fuel.
This is helpful not just to clean dirt particles but helps strip out moisture from the fuel.
Unfortunately, the ip (injection pump) sounds like it has been starving for fuel a while so it might not get full life.
How many miles on the truck?
What miles since you got it?
Do you know if the ip is original?
Before getting a tune for the ecm, you might search “boost fooler”. Of course using one would only be recommended for offroad racing in foreign countries because it may or may not be sanctioned by tailpipe related gubmint organizations. And we surely don’t wanna hurt the spotted tree whale or something like it.
What turbo do you have? Yes a turbo master will wake up the stock asthma attack turbo (thanks for properly name it
@WarWagon). But getting a turbo not designed by penny pinching gm bean counters will help it way more.
If money is really tight - I say diy the turbo master and save the $100 or whatever they cost nowdays towards an hx35/40 hybrid. Maybe hx40… all depending on how you use the truck. Idk if the ATT turbo is still available- A ton of hiway use and hiway towing, that thing is still top of the charts for most.
If you can spend a bit more then talk to
@Twisted Steel Performance and get that turbo he has up for grabs. I think he is going bigger to try burning the tanker of fuel he is supplying via his wazoo DB ip. He has a new variable vein with electronic controller for it he got but hasn’t used. That thing will do great.
If you aren’t aware- the turbos gm gave us on a 6.5 liter 4,000 rpm max capacity engine is 15% smaller than the smallest one Cummins put on the 5.9 liter that doesn’t hit 3,000 rpm. Getting the thing some colder air via an intercooler is also a huge gain. Any 2000 and newer truck the guys replace the stock intercooler with an aftermarket one for noticed improvements so that should say something.
Then There is fixing air flow into the air filter to the turbo. I am still astonished to not see anyone here yet snag the filter housing from a junkyard of an L5P dmax truck and fit it yet for the way better filtering and WAY better airflow.
Last is getting all that air out. Remember an engine is a glorified air pump. Easy in & easy out = efficiency which is the area where both mpg & power improve. Intercooler, bigger turbo, filter, and exhaust all fall in that category. 4” is the desire here. We aren’t pushing the crazy number the newest engines can where they justify 5” or 6”. 4” is plenty for this engine until you spend north of $10k on internal improvements for big power on top of a new engine to start with. So 4” cover the first $20k! And yes some nutjobs do it.
See how I am? You want the truck to start & drive the speed limit and here I am walking you into a whole new fuel system to feed the new turbo and air intake system w/exhaust system. I’m starting to think I read too many hot rod magazines as a kid…
