TurboToy-R;881091 said:
Do I just drop in JDM 2JZ 440's and I'm done??
This will do nothing other than make your car run really rich.
Fuel cut is calculated based on the signal the MAP sensor is sending the ECU. There are several ways around this:
You could put a MAP sensor with a higher scale in place (The stock sensor is a 2.3bar unit, you could put a 3bar unit, and effectively raise fuel pressure 25% or so). This is a bad way to do it though, because you will be leaning your motor out everywhere. If you're running say 13psi, the motor's only adding enough fuel for 10. You can of course comensate for that yet again by adding injectors that are ~25% larger to bring fueling back in place. This is not really a good way to do it though, as it's going to shift all of your ignition advance tables out of place, which can be VERY bad to your motor
This is the same technique that 7Ms use with the Lexus AFM and 550cc injector route. It works well for AFM based motors, where air and fuel are more linearly related, but not so well for MAP based motors where pressure and fuel are not necessarily linearly related.
You could put a fuel cut defender in place. What this does is clamps the MAP signal to a voltage just below fuel cut. So, if fuel cut is 14.5psi, anything above 14.5psi, the motor still think's it has 14.5psi, and still injects the same amount of fuel, and same ignition advance. This isn't as bad as it seems, as 1JZ have a lot of extra fuel to spare. If you're just running a few extra psi, say 17-18psi (which is more or less the upper useful limit of stock twins) then it'll work not too bad.
The third option, which is probably the best, is to install a piggyback computer, like an APEXi NEO, or SAFCII. They essentially run similar to a fuel cut defender, but on top of that, they can also modify the injector signals, to they can add the additional fuel up top, or take away fuel down below.
Not only can you gain more power with a piggyback by simply raising boost, you can gain a lot of power throughout teh powerband by fine-tuning the existing fuel maps to something a little more agressive.
