the check valve has four 3.5mm holes in it... two walbros are about on par with one 044, and were they in series or parallel? it makes a huge difference. also a non boosted car will make more power from the equivilent pump setup, because the pressure it works against is never raised above atmosphere.

if what i say doesn't ring true,go read the ricers gtr, escort cosworth and Porsche pages, who all have much more experience running boost than merc guys.

have you got an in car gauge that you can watch the fuel pressure rise on, most injectors are flow rated at 42.5psi, set the pressure with the engine running and the regulator NOT CONNECTED. vacuum hose blocked.

when you connect the hose the pressure drops,due to engine vacuum, and then as you drive it should raise back to 42.5 (or what ever pressure you set it at) as the boost/vac gauge reads to zero (no vacuum) and then every 1psi of boost should raise the fuel pressure by 1psi, so if you run 12psi boost, so if you set 42.5 psi base pressure, the gauge should read 42.5+12 = 54.5.

you say 84 psi, i dont think a single walbro can flow much at that pressure.

__________________
ce 320 amg
widebody
tiwn turbo
Mutty 'der nail'
soon to be a six speed nail


"some mods improve your car and make it into something it never was, other mods, however, although essentially the same, are not, and make that car a ricer"

if your car isnt shiny, you dont know what you are talking about, remember; paint shine = knowledge. In order to be taken seriously, you should spend all your money on paint, (and get a dyno reading).
Dont forget to polish it often