[hammerdown]

I'm getting closer to getting my SC installed, probably within a month & 1/2 now. I've got concerns about my stock fuel system being up to the task. I'm also working on a limited understanding of how all fuel delivery components work in concert (but I'm trying to learn).


Here is what I THINK I know:

1. Apparently the FPDM recieves instructions from the ECM to modulate a voltage which manipulates fuel pump duty cycle to either increase or decrease fuel delivery to the engine. Check or Hold?

2. The ECM continuously measures fuel rail and manifold pressure and compares that with a known constant (the injector nossle operating pressure) to determine a delta. Yes, No, Sorta-Kinda?

3. Fuel injectors must be supplied with a constant fuel pressure to operate properly regardless of how much fuel is consumed wheter it's at idle or WOT. Correct or No?

4. Based on the delta measured, it instructs the FDPM to either raise or lower fuel pump output based on a sliding voltage scale to maintain a constant pressure in the fuel rail. So Far So Good?


Now here is what I would LIKE to know...

Can the ECM automatically compensate for a higher output fuel pump by simply monitoring the fuel rail and manifold and adjusting instructions to the FDPM accordingly? Or is it something more hard coded into the tune which requires accounting for?


Here is WHY I'm asking these questions...

According to Edelbrock their system doesn't require a fuel system upgrade. Fair enough, I'm still looking for a little extra insurance by way of either a GT40 supercar pump (1st choice) or a BAP (2nd choice) and GT500 pumps are just too $$$ to justify for what I'm trying to accomplish.

Since I'm not building a track car (I'm just looking for a little more 'snap' on the daily commute and the occassional Camaro/Challenger kill) I had planned on using the tune Edelbrock ships with the SC package. Ultimately how will changing/modifying the fuel pump effect the tune that Edelbrock ships right out of the box with their supercharger? Or better stated, how does upgrading the fuel pump relate to engine tuning in general? Is the ECM smart enough to compensate or will I need to have the tune adjusted for the different GT40 pump or the BAP?

Is there anything obvious (or not so obvious) that I'm failing to consider?

Thanks!!
-HD

[brenspeed]

hi HD good questions!

Here is our input. Option 1 being the new single pump is a bad option. We have logged super car pumps vs. stock pumps in a stock fuel system and the single super car pump still maxed out when the stock fuel pump did.

Option 2: That is a great option. Our Brenspeed E-Force package, Saleen Package, Paxton Package, and Vortech package all use the KB Pump. We have used near 1000 of these pumps without issue. For an E-Force 3.5 pulley you can still use a KB pump and the stock pump is still well within reasonable limits of usage. As a matter of fact one of our NMRA cars that races almost every weekend runs an E-Force 3.5 pulley and a KB pump.

Option 3: GT500 pumps. You can never go wrong with them, but yes they are expensive.

Here are some links to the KB Pump. Check them out. If you use one of the tabs by the description it also gives tons of tech info on how the KB pump works. If you need one we have them in stock for only $230 shipped. We also include special S197 instructions and wiring diagram that we made that will show you exactly how to wire it in an S197 application. That way you do not have to figure out the universal instructions included by KB.

kenne bell boost a pump

GOOD LUCK!

[stlwagon]

A BAP on the stock fuel pump will be fine.

[hammerdown]

Originally Posted by brenspeed

hi HD good questions!

Here is our input. Option 1 being the new single pump is a bad option. We have logged super car pumps vs. stock pumps in a stock fuel system and the single super car pump still maxed out when the stock fuel pump did.

Option 2: That is a great option. Our Brenspeed E-Force package, Saleen Package, Paxton Package, and Vortech package all use the KB Pump. We have used near 1000 of these pumps without issue. For an E-Force 3.5 pulley you can still use a KB pump and the stock pump is still well within reasonable limits of usage. As a matter of fact one of our NMRA cars that races almost every weekend runs an E-Force 3.5 pulley and a KB pump.

Option 3: GT500 pumps. You can never go wrong with them, but yes they are expensive.

Here are some links to the KB Pump. Check them out. If you use one of the tabs by the description it also gives tons of tech info on how the KB pump works. If you need one we have them in stock for only $230 shipped. We also include special S197 instructions and wiring diagram that we made that will show you exactly how to wire it in an S197 application. That way you do not have to figure out the universal instructions included by KB.

kenne bell boost a pump

GOOD LUCK!

Appreciate the feedback. I think I may go the route of the BAP then.. Since you're already packaging this item with the e-force and have experience with this combination, is it necessary have to make changes to the edelbrock-stock diablo tune that gets loaded on the car in order to accomodate the BAP?

Or in other words, does adding the BAP require a custom tune?

[stlwagon]

Originally Posted by hammerdown

Appreciate the feedback. I think I may go the route of the BAP then.. Since you're already packaging this item with the e-force and have experience with this combination, is it necessary have to make changes to the edelbrock-stock diablo tune that gets loaded on the car in order to accomodate the BAP?

Or in other words, does adding the BAP require a custom tune?

There are some voltage adjustments that can be made but it would still run fine with the canned diablo tune.

[brenspeed]

You can just use it pretty much plug and play without issues. Set the dial to 30 and the car will run fine as long as you install it per our instructions.

[jgorm]

Yeah the bap is a good option when wired pre fpdm. The FRPS feeds input into a PID loop that controls the signal from the ecu to the FPDM so it always tries to adjust to 40psi pressure drop across the injectors. There comes a point where the voltage table will need to be tuned properly because on transitions it goes straight off the table.

[jaja6009]

Hammer I use the BAP on my Saleen setup from Brenspeed. It is working great. When I have the funds Im going to upgrade to the GT500 pumps for the future which involves some more power.