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I just don't get how stock injectors won't make any more power than stock.... I can add more fuel for days still in tuner studio.... just don't want to make it to rich.
I'm sorry, but i have to agree with everyone else at this point. If you're an NB, you're not using a vacuum referenced FPR. Your injectors aren't keeping up.
Plug it into any generic fuel calulator (which automatically assumes a 1;1 rising rate) and you'll see that you're pretty capped.
I have an FPR for you if you want to convert to return style fuel. 3.5bar base, vacuum referenced, an fittings and all.
Just invest in a solid set of used injectors, have them cleaned or support a vendor.
hate these things, but they get the point across. There are more variables to this, but guess the ballpark of what your injectors will support....near stock/NA hp.
I just threw in a stock BP6D crank hp rating into the FIC calculator. Looks like your stock injectors are perfectly matched for very little boost. Probably enough to overcome the mechanical energy lost in turning a pump through plumbing with pressure losses through bends.
Edit: If honestly, you still believe your stock injectors aren't an issue, then maybe change your fuel filter, and replace your fuel sock on the pump.
Last edited by psyber_0ptix; 05-02-2017 at 12:15 AM.
Sorry, I'm just reading that you can add fuel for days, what duty cycle are they running at full tilt? After 90 is practically just open. How old are the injectors? Think they all flow like new? Will it actually get rich?
Because I thought they were the problem a while back and removed them and put the stocks back in.... I left them out. They were just cheap 550s because I wanted to "eventually" get some that could run e85.
Definitely some good options out there to give you some headroom to flow more for ethanol. Mind your fpr and base pressure at that point. You may be wanting to bump up the base if you're not planning on a referenced system.
Point of reference on stock injector size: I just installed Innovate MTX WB on my otherwise stock NB2. At 7,000rpm with stock ECU I'm running 9.x AFR. So there is some wriggle room left in my injectors. Of course it could be that this engine breaths particularly poorly. I also suspect that the MTX is not as linear as my old LC1.
Same car, running stock fueling with rusefi getting AFR around 11.7 at 6900rpm the injector pw is 10ms. Also indicating that there's room left for a little more breathing.
Disclaimer: I do NOT encourage running a turbo on stock injectors.
If your turbo is in good working condition and properly sized for the engine and said turbo is properly mounted to a capable exhaust manifold and you are not making significant boost, then compressed air escapes somewhere between the compressor outlet and the intake flange on your cylinder head.
You'd still make boost with a 16.5 AFR. It will just kill your engine, but you'll still make boost.
You need to find where the air escapes.
05-02-2017, 12:00 AM
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