Fuel Pump Voltage increase methods
 

Anyone out there tried increasing the voltage to the stock pump to increase PSI delivered?:vash:

Better off just dropping in a 190lph HP for $80

Thanks. Where can you get that price?

Thanks again!

Just to be clear, what is the standard pressure this HP pump delivers, 5 Bar? vs the 3 bar of the stock pump?

The pump is not set to deliver any specific pressure, that is set by the fuel pressure regulator.

Basically, the capacity of a pump is measured in terms of volumes vs. pressure. A larger pump can deliver either a larger volume of fuel at the same pressure, or the same volume of fuel at a higher pressure (or both, along a finite continuum.) So as the FPR calls for more pressure, the pump is able to keep up with demand.

For example, here is the plot from a Walbro 155:
http://www.rev2red.com/images/cars/faq/155lph.jpg

And here's the plot from a 190HP:
http://www.rev2red.com/images/cars/faq/hp190lph.jpg

(Source and credit: https://www.miataturbo.net/forum/showthread.php?t=4288)

So looks like I'll still need to mess with the stock regulator to consistantly hold a higher pressure under boost. I have full ECU control, and trying to make a "cheap" but reliable road racing set up. Weighing the cost of larger injectors vs fuel pressure increase methods with the stock 230cc injectors. Boost is limited to 6 psi, 7200RPM rev limit.

If your stock pump is in good shape and those are your goals, just add a cheap Vortec AFPR and cause your stock pump to rise to 78~80 psi and handle your needs. You can pick them up for around $50 used.

Any known reliability problems with those Vortec units?

I've used them for years on several applications and have had good luck with them.

I have a vortech for sale 40 shipped sorry for the threadjack

AFPR setup might not be so reliable if WOT is maintained for long periods of time. Specially since you're adding an additional mechanical component in the loop, plus the injectors, fittings, lines, and clamps are under higher continuous pressure than they were designed for. Better option is to get larger injectors since you already have an ECU. Is this a MAF or a speed-density based ECU?

I use a 110v inverter, got it for $25 at walmart, works great

No wonder you're throwing down 20g's!!!

ECU runs off a MAP
 

Using a 2 bar sensor.

here are some photos
 

Here are a few pics of the build.

I find myself salivating, yet I'm not looking at a reese's peanut butter cup.

Run a fused gauge 10 wire from the alternator to a relay on the fuel pump. May get you enough if it's marginal.

engine bay looks great man