This is an upgrade, along with a bigger fuel pump for a turbo kit I was reading about, can't remember exactly where right now. It increases fuel pressure along with boost. Can't this be done by tuning? How is this necessary or adventageous over tuning?

 

The MSD Boost-a-Pump applies more voltage to the fuel pump, proportinate to the amount of boost the motor is seeing. Some people on this board swear by these systems, but I'm not a real fan of this, expecially since the MSD unit has the capability of applying 22 volts to the fuel pump.

Aftermarket tuning is obviously a must with a forced induction motor (at least if you want any accuracy & safety), but the PCM has no control over fuel pressure. So one somewhat reliable way to maintain consistant fuel delivery through varying atmospheric intake environments (both vacuum & pressure) is to use an adjustable fuel pressure reulator that is boost sensitive as well.

 

I thought the pcm had a command of the fuel pump, regulated by readings of various sensors, like the MAF and O2 sensors?? Where am I mistaken?

 

The PCM merely turns the pump on. The pump runs at a constant speed and isn't actively controlled as some late model Ford applications are.

 

I made over 700rwhp with a single 255lph in-tank and a Kenne Bell Boost-a-Pump. Nice piece, IMHO.

 

Nothing wrong with using a BAP as long as you're sensible about it. I wouldn't apply 22vdc as the pump could cavitate but there's nothing wrong with bumping the voltage up to 15-16vdc. In fact, the Racetronix harness sold with their pumps has a connection for using a BAP so you don't have to cut the harness.

 

I use a Boost-A-Pump. I only raise the voltage a little bit maybe 2 volts. The biggest reason I use it is because it will keep the voltage constant with its internal voltage regulator. Many people have a power problem and don't even know it. The problem is that at high RPMS you usually see a voltage drop at the pump. Next time you are on the Dyno throw a volt meter on the power input to the pump and watch it through a run. You may see some disturbing numbers. Jeff

 

If the fuel pump runs at a constant rate then an fbody in Denver will pump just as much fuel as an fbody in Tennessee on stock vehicles?!

 

I was going to run a the MSD boost-a-pump also when my motor was stock however I went with the dual intank set up so its up for sale and never been used.

-B

 

Will I still need a bap if I have big-enough injectors, the Racetronix fuel management system and a tune?

 

What power levels are you looking at? I have a 383, ported 190 AFR heads, 224-236 cam,seeing 9# with Mototron 60's and racetronix single fuel pump kit, running 11.0-1 a/f.(I still have to fine tune) I have a MSD BAP installed, but didn't have to use it just yet. What is your setup going to be, more info please.......John

 

Someone correct me if I'm wrong here, but to answer your question, a BAP doesn't necessarily increase fuel pressure. It merely increases the *volume* of fuel being pumped through the system, which you may need at WOT, given the setup. The fuel pressure regulator / FMU (if equipped) will maintain whatever pressure you've set it to, and return the excess fuel back to the tank. In other words, this is about meeting fuel *volume* requirements -- not necessarily using it as a crutch for improper computer programming.

FWIW, I have the MSD and a Walbro 255, and was told it's safe to run 16-17vdc. The more voltage you supply, the faster the pump will pump, so 16 volts will obviously supply more volume of fuel than the stock +12vdc. In either case, it's a good idea to at least upgrade the factory fuel pump wiring -- you could use the factory wiring to trigger a secondary relay.