Boost-a-pump question

[O's Fan Rich]

Can I install the BAP completely and run the car for a few days before I install the s/c ?
Trying to get a jump on the weekend project.

[FordNut]

Yes. I did it on mine and it is wired to run full-time instead of using the boost switch.

[O's Fan Rich]

I was just reading those threads, Brian. The comments from Lidio on that got me to thinking about doing just that.
I'm not going to install the boost gauge before the install, since I'm waiting on a delivery from Summit with some others.
Won't hurt the fuel pump to install the BAP then.

[SergntMac]

I agree with Brian, you can install it anytime and adjust it according to your needs. My BAP is on full time too.

[RF Overlord]

Rich, if you choose not to have the BAP on full-time, remember that in the standard configuration it is only activated when the switch that is installed in the vacuum/boost line sees either 3.5 or 5 lbs of boost (I forget which...it's printed on the side of the switch). Since you won't have the blower installed, the switch will never see a boost condition and it won't activate. So go ahead and install it ahead of time...

[jim geary]

Quick, dumb question. Does the BAP assist the fuel pump so that you don't
have to spend an arm and a leg on a new fuel pump or is it for some other
function? Don't mean to be so dumb, but I just don't know.

[RF Overlord]

Does the BAP assist the fuel pump so that you don't have to spend an arm and a leg on a new fuel pumpYes. The BAP is set up to increase voltage to the fuel pump to be sure there's an adequate supply of fuel when the blower is in boost. Check out this link (http://www.kennebell.net/techinfo/general-info/BAPtheory_kens.pdf) for more info.

[jim geary]

Thank you. Good reading.

[Smokie]

The voltage available to your fuel pump varies with the load on your cars electrical system, at times your fuel pump may be operating on 12vdc or less, at other times it may be 14.5vdc.

A direct current motor can operate within a voltage range that has a maximun voltage at which you overheat or burn up the windings. The output of the fuel pump will be significantly greater at 15vdc compared to 11vdc.

On a stock car these voltage fluctuations are not great enough to cause a drop in fuel pressure that would be dangerously lean. Once you go to force induction and increase the size of your fuel injectors, these voltage fluctuations CAN be a problem and cause a lean condition.

The BAP is an adjustable voltage regulator for your fuel pump that will increase the output voltage over the input voltage by a factor of 1 vdc if set at 1, 2vdc if set at 2 and so on.

Example: if the input voltage to your BAP is 13vdc and you have the BAP set at "2" the output voltage to your fuel pump is 15vdc. The BAP allows you a maximun of 5vdc over the input voltage, this is ok for competition for a brief burst of time, it would not be good for the longevity of your fuel pump to be operating at 18vdc all the time.

[BillyGman]

.....will increase the output voltage over the input voltage by a factor of 1 vdc if set at 1, 2vdc if set at 2 and so on.

Example: if the input voltage to your BAP is 13vdc and you have the BAP set at "2" the output voltage to your fuel pump is 15vdc. The BAP allows you a maximun of 5vdc over the input voltage, this is ok for competition for a brief burst of time, it would not be good for the longevity of your fuel pump to be operating at 18vdc all the time.Hmmmm, if all this^ is true, then that means that any of the adjustments above 5 are meaningless even though the dial goes up to 20. Are you sure about this Javier?

The Trilogy manual instructs us to "adjust it to 10 as a starting point" and I've had it set at 10 ever since I installed the Trilogy Supercharger over two years ago. And my fuel pump is just fine after taching up 39,000 supercharged miles since then. And I get into boost on a daily basis with this car, and into full boost atleast once, if not twice per week.

[O's Fan Rich]

Thanks for the help guys! It's in and the car works yet!!!
Gonna work on the Snow Meth kit install now. Gotta make a bracket or two for that.

[RF Overlord]

If I understand Kenne-Bell's document correctly, the BAP doesn't actually "boost" the voltage, rather it increases the duty cycle of the PWM signal fed to the fuel pump.

*EDIT* OK, I re-read the article and I was wrong...the BAP works by both increasing the voltage to the pump AND modulating the PWM duty cycle. It appears to increase the voltage to the pump from ~14V to ~17V, then offsets the duty cycle downward during normal operation, raising it only when necessary.

[Smokie]

Hmmmm, if all this^ is true, then that means that any of the adjustments above 5 are meaningless even though the dial goes up to 20. Are you sure about this Javier?

The Trilogy manual instructs us to "adjust it to 10 as a starting point" and I've had it set at 10 ever since I installed the Trilogy Supercharger over two years ago. And my fuel pump is just fine after taching up 39,000 supercharged miles since then. And I get into boost on a daily basis with this car, and into full boost atleast once, if not twice per week.

My apologies Billy, I forgot the ZEROS, please add a zero after the 1 and the 2 and so on.....damn those zeros.:D

10% adds one volt
20% adds two volts
30% adds three volts
40% adds four volts
50% adds five volts

The dial goes from 10 to 50.