I just loaded up the revo TNT software, running the old 4.11 software currently. I have the things as posted in my sig and with the 4.11 software I have noticed cruising 65-70 mph rail p. is about 17,500 or so, with quick acceleration from this point the rail p. initially drops to about 15,000 then quickly recovers and builds all the way up without a wimper. This is with PPE dual pumps and a walbro lift pump. Watching the low side fuel pressure which I have set to about 11 psi at idle it initially is about 10-10.5 at 65-70 and dips only a little to about 8-9 with quick acceleration. My question is how to get rid of this little dip in rail pressure, more volume flowing lift pump or would I have to resort to some increased rail pressure? This is with brand spanking new straight from Bosch to Don Flux 3.3's that are in prestine condition. Thanks, Jay Also I will be providing some more air later this summer with a set of twins if I can ever sell my house (two concurrent house payments suck )

 

First, I don't think the Walbro can fully support the 3.3's--- but before you trade out, try this... get the spring kit, set the psi at 30-32. When you mash it, the pressure will likely drop to 20psi, which is max flow for the Walbro...If this doesn't do it, meaning if this doesn't solve the problem or you see your pressures still drop below the 20 I describe... then you need a bigger pump... but I think you do anyway, but for $20, vs $500, it is certainly worth a try.