[Mike@N54Tuning.com]

I got a few photos that you guys might be interested in with all this fuel pump talk. BMS is setting up a fuel pump voltage booster for one of their customers and took a few photos showing the fuel pump location, connectors, and contacts. The main power connector should look familiar to many of you!

Mike

[dzenno]

Omg

"My fuel pump brings all the boys to the yard,
And their like
It's better than yours,
Damn right it's better than yours,
I can teach you,
But I have to charge"

Lol

[5soko]

NICE! looking forward to the results. should be interesting.

[dzenno]

Mike, John and i tested that already at Champion a few weeks back by applying 14V to the pump and the pump still lost pressure as measured on a FP gauge...just an FYI, good luck but I really don't think voltage will do anything

[cn555ic]

Maybe an upgraded pump will!!

[bulldog_yyc]

Originally Posted by dzenno

Mike, John and i tested that already at Champion a few weeks back by applying 14V to the pump and the pump still lost pressure as measured on a FP gauge...just an FYI, good luck but I really don't think voltage will do anything

[wren57]

So while Shiv is bench testing, calculating figures and considering internal turbine sizes, etc, you're just cranking up the power and taking pictures. Research is good. Do some.

[Clap135]

Don't worry, why do research when you can just copy.

[cuban335i]

Originally Posted by Clap135

Don't worry, why do research when you can just copy.

lol exactly what I was going to say..

[Brian135i]

Wow, it never ends.

[Mike@N54Tuning.com]

Originally Posted by dzenno

Mike, John and i tested that already at Champion a few weeks back by applying 14V to the pump and the pump still lost pressure as measured on a FP gauge...just an FYI, good luck but I really don't think voltage will do anything

According to BMS they measured the stock pump controller dutycycle and it already runs the full 14volts as they expected. So you'll need more than that to boost flow.

Mike

[dzenno]

Originally Posted by Mike@N54Tuning.com

According to BMS they measured the stock pump controller dutycycle and it already runs the full 14volts as they expected. So you'll need more than that to boost flow.

Mike

We measured it too and it was 11V strange...

[Clap135]

both of you might be right. On DI cars the lpfp does not get fed a constant voltage.

[dzenno]

Originally Posted by Clap135

both of you might be right. On DI cars the lpfp does not get fed a constant voltage.

This was logged using an oscilloscope throughout the entire pull...11V was at full load at high boost..

[Mike@N54Tuning.com]

Originally Posted by wren57

So while Shiv is bench testing, calculating figures and considering internal turbine sizes, etc, you're just cranking up the power and taking pictures. Research is good. Do some.

Actually they used to make a fuel pump voltage booster ~15 years ago for supercharged LT1 applications. The more complicated issue is what is causing the low fuel pressure oscillations they are seeing in their datalogs under higher fuel pressures. And as I said in another post all this fueling talk only really concerns the 10 people running RB turbos and maybe a couple nitrous customers. If you are making less than 450whp the stock system is up to the task as many have proven.

Mike

[Clap135]

Originally Posted by dzenno

This was logged using an oscilloscope throughout the entire pull...11V was at full load at high boost..

Ever wonder if the ecu would alter that signal if it wasnt given bullshit stock values for everything?

[ianthegreat]

keep us updated!

[Mike@N54Tuning.com]

The DME runs 14 volts and varies its duty cycle to change pump speed. At full duty a volt meter will show 14v. At idle a volt meter will show around 7v. The voltage hasn't changed just the ratio of how long it was applied (e.g. the duty cycle). Here is a video showing the actual N54 low pressure duty cycle. This is why you use a real scope for investigative work before writing the white paper.

Mike

[dzenno]

Originally Posted by Clap135

Ever wonder if the ecu would alter that signal if it wasnt given bullshit stock values for everything?

Maybe, GeorgeSmooth could answer that question or anyone running a flash and high boost...you have cobb flash so u could do it too as a reference point..easy peasy

[onesuperboi]

The tuning war is like the fashion industry.

Shiv comes up with the newest design and shows it on the catwalk at some fashion show. Terry is sitting at the front row drawing the sketch of the latest design of Shiv's and brings it to his shop to make a similar outfit for half-price. People then buy the cheaper one to save money.

But remember, someone had to have an idea first and innovate or there wouldn't be anything to copy from...

[Mike@N54Tuning.com]

Originally Posted by Shiv@Vishnu

At 72psi:
Pump 1.... 356 lbs/hr @ 12.2 Amps
Pump 2.... 300 lbs/hr @ 13.5 Amps

Pump 1.... 228/0.55 or 415 Horsepower
Pump 2.... 204/0.55 or 371 Horsepower

Now let’s not forget that this represents approximate engine horsepower, NOT wheel horsepower a la Dynojet. So subtract another 30hp for driveline loss and you end up with:

Pump 1.... 385whp
Pump 2.... 341whp

Impossible, I’m making more power than that!

When you crunch the numbers Shiv came up with but take in to account that the system already runs at 14volts his testing makes much more sense. You come up with a theoretical power range of 545-647hp at the crank at .55 BSFC. Keep in mind flow data is generally very optimistic and doesn't account for all the restrictions one will see with the same pump in car. If you run with his numbers with a 15% drivetrain loss that isn't far off the 440-450hp at the wheels we are seeing in non-meth testing before the fuel pressure drops are observed. Meth seems to extend that another 30-40whp.

Mike

[SennaZ]

Originally Posted by Mike@N54Tuning.com

This is why you use a real scope for investigative work before writing the white paper.

Can't believe Shiv would have missed the concept that on-demand, electronic fuel pumps all use a square wave variable duty cycle to control the pump speed...strange.