Fuel pressure adjustments allow a tuner to change the amount of fuel delivered per unit time from the injector. Any changes affect the fuel curve globally, so re-mapping the ECU's software is critical whenever pressure is turned up or down. Please consult with one of our staff with any questions. It is critical that your combination of injector and fuel pressure is optimal for the amount of power that you care to produce.

For those who wish to calculate mass flow themselves, we offer the following formula:

F2 = (√P2/√P1) x F1

F2 = New flow rate (lbs/hour or cc/min)
F1 = Old flow rate (lbs/hr or cc/min)

P2 = New Pressure
P1 = Old Pressure

Example: We have an injector rated to flow 315cc/min at 43.5 psi (3bar). That combination does not flow enough fuel to reach our desired output. So, we wish to determine how much will it flow at 58psi (4bar):

F2 = (√58 / √43.5) x 315
F2 = (7.616 / 6.596) x 315
F2 = 364cc/min




Product Image Item Name- Price
Bosch Motorsports adjustable FPR

Bosch Motorsports adjustable FPR

Use this adjustable unit if you need to adjust between 4.5 and 12bar fuel pressure. When combined with suitable injectors (available through USRT)...
$475.00

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Fuelab Adjustable FPR

Fuelab Adjustable FPR

Fuelab Fuel Pressure Regulators are designed for EFI applications running between 1.72-6.3bar (25-90psi) fuel pressure. Use this part to consistently...
$135.00

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VW/Audi Adjustable drop-in FPR

VW/Audi Adjustable drop-in FPR

Dial in your air/fuel ratio while keeping your stock fuel rail. Or, place in a USRT fpr adaptor and use with a high-flow fuel rail. Don't forget...
$75.00

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Aeromotive 13109 Adjustable FPR

Aeromotive 13109 Adjustable FPR

One of the finest adjustable regulators on the market today, use this part to consistently manage fuel pressure when supporting over 600hp. Works...
$149.00

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Fuel Pressure Gauge

Fuel Pressure Gauge

Highly accurate pressure gauge for engine bay placement. Liquid-filled to dampen vibration from the engine. Use T-fitting (not included) to install...
$30.00

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Gauge Adapter

Gauge Adapter

T-fitting allows gauge fitment to stock fuel lines.
$9.00

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BBM FPR Adapter (MK3 & MK4)

BBM FPR Adapter (MK3 & MK4)

Properly adapt a factory Mk3 or Mk4 fuel pressure regulator to your high-flow fuel rail with the confidence that it will not leak. Features -6AN...
$85.00

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Genesis FPR Adapter (MK3 & MK4)

Genesis FPR Adapter (MK3 & MK4)

You've got a serious build and need to attach a factory Mk3 or Mk4 fuel pressure regulator to your high-flow fuel rail? Here's a superior...
$79.00

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BBM Fuel Rail Fitting Kit (MK3 & MK4)

BBM Fuel Rail Fitting Kit (MK3 & MK4)

Complete fitting kit for -6AN fuel rail and BBM FPR adapter. Use with BBM MK3 and MK4 fuel rails. Works with fuel pressure regulator adapter part #...
$45.00

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Quick Release Factory Fuel Line to -6AN Male Adapter

Quick Release Factory Fuel Line to -6AN Male Adapter

Make installation of -6AN lines to your factory hard lines a simple task. This innovative two-piece fitting clips together on the VW/Audi...
$20.00

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