On the 3vze if I were to add larger injectors would they be somewhat plug and play or are they something that would require ECU modifications? I'd like to go to larger injectors when I change the cams in preperation for future modifications. Finally what options are there for larger injectors for the 3.0?

 

Most injectors are sized below 80% duty cycle OEM. On the 22RE, running WOT, you might hit 50-60% duty cycle. You'll go above that for certain acceleration enrichment conditions, but my point is that there injectors typically have reserve capacity to spare up to some limitation.
For the 22RE, you're looking at another 30hp or so before you even need to think about it.

You could also increase your static fuel pressure, this essentially results in "larger" injectors.


Your ECU is going to be able to deal with minor injector size differences. We're talking about a very small difference in injector size. Certain things, like start up pulse width aren't calculated closed loop, they're calculated making some assumptions about the current injectors. Further, when operating in closed loop, the ECU is only allowed to correct within certain bounds before throwing a code.

Bigger injectors usually require an ECU that is tuned for those injectors.
You don't need bigger injectors unless you're really starting to get some power out of that motor. Do the "injector size" calculations for the 3.0L based on cc/min - you'll be suprised about how much power they can support.

 

Wow, thats some good tech!

 

How do I do that?

I really wanna see how close to 200hp I can get with a NA 3.0 before starting with the FI.

 

Tell me how big (cc/min) the stock injectors for the 3.0L are. I'll tell you if you even need them at 200hp.
There are several tunable ECU options - SDS, FAST, megasquirt.

 

200cc per minute.

 

http://www.bgsoflex.com/pwcomp.html
3L = 183 ci
200cc/min = 19 lbs/hr


You'll support 180-185 hp with stock injectors.
Running above that will mean more than 80% duty cycle under some conditions.

At 90% duty cycle, you'll be pushing up to about 205 hp.


Personally, I'd raise my fuel pressure by about 10% before going to different injectors.

 

Whats the best way to increase fuel pressure? I'm pretty sure I'll be going MS but it won't be for a while meanwhile I wanna slowly work up to what I'll need for FI.

 

Replace your fuel pressure regulator. You'll need a fuel pressure gauge on the rail also to be able to calibrate it.
I think Rick at fullboogie.net can help you if you need a drop in solution.
Personally, I wouldn't mess with it until my mods started to support that kind of power. You'll have to do heads (or at least the cams) - and replacing the fuel pressure regulator will be a lot easier at that time.

 

would you be able to do that with just stock heads and cam?