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
3.0bar Fuel Pressure Regulator

3.0bar Fuel Pressure Regulator

The most economical way to get custom fuel flows is with a drop-in fuel pressure regulator. Sum of boost pressure + fpr should never exceed 6bar. Use...
$39.00

Add:

3.5bar Fuel Pressure Regulator

3.5bar Fuel Pressure Regulator

Raises fuel flow 8% over 3bar. The most economical way to get custom fuel flows is with a drop-in fuel pressure regulator. Sum of boost pressure +...
$39.00

Add:

4.0bar Fuel Pressure Regulator

4.0bar Fuel Pressure Regulator

Stock fpr in many VW/Audi engines. Raises fuel flow 15.5% over 3bar. The most economical way to get custom fuel flows is with a drop-in fuel pressure...
$39.00

Add:

4.5bar Fuel Pressure Regulator

4.5bar Fuel Pressure Regulator

Raises fuel flow 22.5% over 3bar. The most economical way to get custom fuel flows is with a drop-in fuel pressure regulator. On older design...
$39.00

Add:

5.0bar Fuel Pressure Regulator

5.0bar Fuel Pressure Regulator

A jump to 5bar over an original 3bar pressure raises flow by 29%. The most economical way to do it is with a drop-in fuel pressure regulator. On...
$55.00

Add:

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

Add:

Gauge Adapter

Gauge Adapter

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

Add:

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

Add:

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

Add:

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

Add:



Copyright © 2014 Usually Sideways Rally Team.