Turbo Taco

OP, the 3.4 has been less common to turbo, IMO due to the ease of the S/C install, CARB and all of it's support.

With my S/C, I have had great success with the AEM FIC to control fuel and timing. It wasn't easy from the get-go (get a lot of pms on another forum on how to get it up and running perfectly). My preference for the FIC is how it controls fuel- via the injector signals directly. Controlling larger injectors is a breeze. It also can retard timing, and skew o2 signals to give you closed loop control-- all this and more and tuning is live, you do not need to shut anything down to make changes. I have my wideband wired into the FIC for it's data-logging abilities, and a switch to another wire that gives me the ability to switch between maps, and I use one of it's analog outputs along with an in-between circuit to control water/meth. I would have gone with 550cc injectors just to prove a point, but even at 420cc, its way overkill for what the S/C needs. But for a turbo, one needs more fuel supply (its more efficient and oh so easy to crank up the boost) and I can't imagine messing around with extra injectors, fuel rail assemblies, fuel line taps, multiple piggyback boxes etc. FIC, Walbro, Injectors- bam, IMO ready for boost up to and beyond the internal's limit, until the point where timing control needs to be much more accurate/consistent over a piggy.

With a 2.2 pulley, my truck drives like it came boosted stock. The g/f drives the truck all the time, with no issues- no hickups, and she is very fickle about a car's driveability.

 

The ECU has a auto-learn feature that will automatically start trimming the fuel. When does it stop trimming fuel? I'm putting second ECU in as first one kept trimming until I couldn't run in boost.

Thoughts? I'm looking at piggyback tunable. If someone has a better idea please let me know.

 

Do you have a rising 1:1 adjustable fuel pressure regulator? That can help get past that. Not the preferred choice, but that increase in from pressure from the boost will push a lot more fuel. Nothing beats tuning, combined with that though.