[charliex]

That just can't be, 550cc's on a 160lph pump just doesn't make sense, you can certainly be running at 100% DC and maybe getting enough fuel, but thats stretching the definition of 'works'.

say its 370 HP at the flywheel. 4 injectors, 80% duty cycle, turbo so .55 BSFC, fuel pressure 46.7 lbs = 650cc's, 61.84lbs/h

you'd have to be running 90% DC minimum to get 550cc's to work at that BSFC and HP, and thats if its flywheel.

( 370 * 0.55 ) / ( 4 * 0.80 ) / sqrt( 46.7 / 43.7)


The thing i don't get about all this, is that Phil has already shown that his data backs up the math and my data, and the dyno, he's running out of fuel on the 440cc's, the 550cc's buy you some headroom but you'll still run out, its just not as quickly.

if that still isn't enough information, here is a dyno sheet from a car that i added fuel to i ran out of scaler and map, no matter how much i added ( and you can see how rich it got) it would not add any more fuel, and thats simply because the pump wasn't keeping up., look at the power drop off, the lower rev etc, at heavy load its in the 13's. each run had increased fuel, and the DC was way over 80% you can see just how linear the drop off is as the pump struggles to keep up.

i can probably go and find a boxful of sheets that look just like this.