Holley P-N 512-505 User Manual

SUPERCHARGER REGULATOR

P/N 512-505

The Holley SUPERCHARGER REGULATOR (SR) is a supplemental fuel pressure regulator
designed to increase the fuel pressure on supercharged engines during boost conditions. A
Supercharger Regulator is used on supercharged engines as a method to maintain a safe air-fuel
ratio during boost without the need for larger injectors or ECU recalibration. It is designed to work in
conjunction with the stock regulator. The stock regulator controls fuel system pressure when the
manifold vacuum is present. When boost occurs, the SR increases fuel pressures as the manifold
boost increases.

NOTE: You, the installer, must read completely through these installation instructions

BEFORE you begin installation and carefully follow the instructions. Failure to do so
may result in product/system and/or engine failure.

INTRODUCTION

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Holley Performance Products has written this manual for the installation of the Supercharger Regulator. This manual
contains all the information needed to install this product. Please read all the WARNINGS, NOTES, and TIPS, as they
contain valuable information that can save you time and money. It is our intent to provide the best possible products for
our customer; products that perform properly and satisfy your expectations. Should you need information or parts
assistance, please contact our technical service department at 1-270-781-9741, Monday through Friday, 7 a.m. to 5 p.m.
Central Time. Please have the part number of the product you purchased when you call.

The Holley Supercharger Regulator (SR) is a supplemental fuel pressure regulator designed to increase the fuel
pressure on supercharged engines during boost conditions. A Supercharger Regulator is used on supercharged engines
as a method to maintain a safe air-fuel ratio during boost without the need for larger injectors or ECU recalibration. It is
designed to work in conjunction with the stock regulator. The stock regulator controls fuel system pressure when manifold
vacuum is present. When boost occurs, the SR increases fuel pressures as the manifold boost increases.

NOTE: Since all engines have different fuel requirements, it is highly advised to use equipment that can monitor the

air/fuel ratio after this component is installed.

WARNING! FAILURE TO DO SO MAY RESULT IN PRODUCT/SYSTEM AND OR ENGINE FAILURE!

Pressure

Adjustment

Pressure Relief

P

Figure 1

Vacuum

P

INSTALLATION

1. Using the supplied bracket, mount the Supercharger Regulator as close as possible after the existing regulator.

2. The SR has two inlets and one outlet port. They are machined for a –06 fitting and require an O-ring for proper
sealing. Connect one or two inlet lines to the sides of the SR. The bottom fitting is for the return to the fuel tank.
Three fittings are included to attach –06 lines. Hardline to AN fittings are available from plumbing supply houses and
fitting manufacturers that can be used to connect the regulator to the steel return line.

3. Attach a vacuum line from the intake manifold to the 3/16” hose barb on the SR.

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