what are the symptoms of actually running out of fuel pump or injector?

[thor'svr4]

The car does slow down a little once i get to 6,000rpm but i'm not sure if i would have described it as hitting a wall. Then again i don't really know what fuel cut feels like so for all i know the slight loss of power up top is from fuel cut. When you hit fuel cut will the data-logger show IDC's dropping to 0% due to fuel cut or still at 110%?

theres no noticeable exhaust leak but since exhaust gaskets are cheep ill just replace them all.

[Chris@Rvengeperformance]

you know if you hit fuel cut. it is harder than hitting the rev limiter

[sergechronos]

Hitting fuel cut feels like somebody took the car out from under you. The motor feels like it's been replaced with a lawnmower engine.

[NOMIEZVR4]

what fuel are you using? 93 or e85? c16?

[futurevr4man]

fuel cut it extremely noticeable. i thought i blew up the engine the first time my car did it because it stumbled for a second or two after.

the car stutters really bad and backfires when you hit fuel cut. it doesnt "get slower", it just doesnt go at all.

[thor'svr4]

Im running pump 93.

Is there any way you can hit over 100% IDC's without getting fuel cut? normally i only do one gear pulls then let out and coast down back to speed. but i did notice that if i tried to do a pull though multiple gears the car would stumble for a second after i shifted. it feels similar to when an IC pipe blows off but goes away after ~1-2 seconds. i figured that it was prob due to the water meth spraying for a split second after the throttle body was closed and the motor sucking in un-atomized w/m once i got back into the throttle...

[Chris@Rvengeperformance]

you have to exceed load for greater than 1 second. That is why it is a lot easier to hit fuel cut in 3rd.

[TurboSinceBirth]

Fuel cut feels like surging where the power/acceleration gets completely cut off due to the ecu shutting off the injectors so they don't stick wide open which can happen at 100% IDC. That's why they recommend choosing an injector based on 80% IDC because sticking one open would ruin your motor in a heartbeat.

You either hit fuel cut, have high IDCs, or lean out considerably in boost when you're out of fuel. I've experienced all three aiming for 600AWHP of fuel on E85.

[futurevr4man]

thor i dont know your setup, but kinda sounds like spark blowout to me. fuel cut is extremely noticeable, and i dont think that you are hitting it personally

[thor'svr4]

yea after thinking about it i dont think its fuel cut either. if i hit fuel cut at 6,000rpm theres no way the car would continue to rev to 7,000rpm while under fuel cut.
I literally just installed a set of brand new OEM coil packs, brand new OEM wires, and brand new NGK plugs gapped to 0.025" so i highly doubt its spark blow out.

at this point i think my best bet would be to check the voltage on the walbro and if the voltage looks good than ill remove the 255lph and install a walbro 400lph. if the problem persists i could try installing a set of 650's.