[Rydog2SS]

Originally Posted by arpad_m

To my amateur eyes your setup looks severely out of fuel supply capability.

High side fuel pressure < 1000 psi (instead of 2900 to 3100) and a crazy high 9.9 ms injector pulse width (instead of < 6 ms) even when the tune commands a lean 0.87 lambda at WOT is pretty bad. The low side should be above 70 psi, too, although 65.8 psi isn't that bad.

Also, you're running E44, which demands even more fuel than 93, and that 18 psi boost is way too much for a plain LT4 fueling setup with a +32% fuel lobe cam. Is the situation better if you run 93 octane?

That said, this still doesn't explain the high idle load you described... I'll wait for the pros to see what they think so I can learn, too

yeah, it wasn't like that before, like literally earlier in the same day prior to something happening, it is a mechanical issues that I am assuming is starving the HPFP during different times, everything is screwed up on the HPFP, Rail Pressure, and injector pulse. just trying to figure out what it is. The car usually runs about a .82ish Lambda and the only reason it stayed even close to the commanded amount is because of the methanol. I think if not for that it would have been close to .94 or .95... def not good.

just trying to avoid spending all kinds of money on another fuel pump and it be something else.

Going to try the low side check valve being stuck or failing in some sort of way.