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Old 08-24-2008, 10:13 AM   #1
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Default Fuel Pump Voltage increase methods

Anyone out there tried increasing the voltage to the stock pump to increase PSI delivered?
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Old 08-24-2008, 10:22 AM   #2
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Better off just dropping in a 190lph HP for $80
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Old 08-24-2008, 10:59 AM   #3
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Thanks. Where can you get that price?
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Old 08-24-2008, 11:04 AM   #4
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Old 08-24-2008, 11:04 AM   #5
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Thanks again!
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Old 08-24-2008, 11:06 AM   #6
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Just to be clear, what is the standard pressure this HP pump delivers, 5 Bar? vs the 3 bar of the stock pump?
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Old 08-24-2008, 11:18 AM   #7
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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:


And here's the plot from a 190HP:


(Source and credit: https://www.miataturbo.net/forum/showthread.php?t=4288)
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Old 08-24-2008, 11:24 AM   #8
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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.
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Old 08-24-2008, 11:29 AM   #9
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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.
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Old 08-24-2008, 11:32 AM   #10
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Any known reliability problems with those Vortec units?
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Old 08-24-2008, 12:13 PM   #11
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I've used them for years on several applications and have had good luck with them.
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Old 08-24-2008, 11:28 PM   #12
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I have a vortech for sale 40 shipped sorry for the threadjack
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Old 08-25-2008, 07:43 PM   #13
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Quote:
Originally Posted by drgoodwrench View Post
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.

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?
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Old 08-25-2008, 08:29 PM   #14
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I use a 110v inverter, got it for $25 at walmart, works great
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Old 08-25-2008, 08:47 PM   #15
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Quote:
Originally Posted by Stealth97 View Post
I use a 110v inverter, got it for $25 at walmart, works great
No wonder you're throwing down 20g's!!!
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Old 09-03-2008, 11:33 AM   #16
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Default ECU runs off a MAP

Using a 2 bar sensor.
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Old 09-03-2008, 11:39 AM   #17
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Default here are some photos

Here are a few pics of the build.
Attached Thumbnails
Fuel Pump Voltage increase methods-dsc01009.jpg   Fuel Pump Voltage increase methods-dsc01024.jpg   Fuel Pump Voltage increase methods-dsc01025.jpg   Fuel Pump Voltage increase methods-dsc01019.jpg   Fuel Pump Voltage increase methods-dsc01027.jpg  

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Old 09-03-2008, 11:43 AM   #18
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I find myself salivating, yet I'm not looking at a reese's peanut butter cup.
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Old 09-03-2008, 11:47 AM   #19
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Run a fused gauge 10 wire from the alternator to a relay on the fuel pump. May get you enough if it's marginal.
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Old 09-03-2008, 11:54 AM   #20
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engine bay looks great man
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