Category Archives: Paxton

The Fuel Management Unit

Getting Technical

The FMU, also know as a “boost dependent fuel pressure regulator,” only increases fuel rail pressure when boost is applied to the reference port on the FMU. This regulator is in the return fuel line and is downstream of the static fuel pressure regulator. The FMU is a simple mechanical device that can be calibrated by changing the internal ring and spacer. Inside an FMU is a piston. The boost pressure comes from the manifold to a fitting on the FMU and applies pressure to a washer sitting on the piston. The larger the washer, the more pressure it applies on the piston. The piston pressure blocks the flow of fuel down the return line. This backup creates a higher line pressure because the fuel cannot freely pass through.

There are two key ingredients to making horsepower: fuel and air. We are going to discuss the most popular methods of increasing the quantity of fuel, to support the air entering the motor under boost, and its relationship to the amount of power you are trying to make.

3 Steps to Delivering More Fuel

Traditionally, there are three most common ways to deliver more fuel to your engine. They are:

  • Upgrade Your Injector Scenario
  • Utilize the Power of the FMU w/ Existing Injectors
  • Use a Computer Programmer to Regulate Fuel Management With Upgraded Injectors

Upgrade Your Injector Scenario

To get more fuel, you can run larger injectors, increase the pressure to the injectors you already have, or add an auxiliary set of injectors. The auxiliary set of injectors usually squirts fuel into the manifold and requires a secondary injector driver to tell the injectors when to fire and for how long. This method is effective for street cars because it lets the car run like normal with smaller injectors. It is also good for cruising because it prevents the motor from overloading with fuel and stumbling. It then allows the second set of larger injectors to give more fuel when you are trying to make power. The major downside is that this method is very expensive because of the additional components required. Furthermore, it can be very difficult to tune because of the wide adjustment range of a completely separate set of injectors. This common dilemma led to the eventual creation of the FMU.

Utilize the Power of the FMU

The FMU is great because it allows the car to run normally on a small injector, but can also increase the rail pressure under boost which, in turn, forces more fuel through the same size orifice. The fuel that the FMU adds has a direct relationship to the boost pressure. The proportionality is usually stated in a ratio, for example 12:1. This means that the FMU will add 12psi of fuel for every psi of boost. (For example, 10psi of boost will add 120psi of fuel pressure.) When all is said and done, this could net a total of about 140psi of fuel pressure which is often too much for a little injector to handle. It is also the reason most people opt for a combination of larger injector and lower ratio of FMU. This is an ideal setup because it allows the same quantity of fuel but at a lower pressure which is more constant for tuning and less fatiguing on the injectors.

Computer Programs and Fuel Management

The third most popular method of increasing fuel is to add larger injectors and use a computer chip to calibrate and control them. This often can cause the car to run great under boost. However, it is often harder to mange when the car is a daily driver or when cold started. Even this method only can supply enough fuel to support a given amount of pressure. Eventually it, too, requires an injector so large that it would not be suitable for any type of street driving – just racing.


This is why the FMU has become so popular. It offers great versatility for street and strip use. You get the ability to support horsepower and still have the street ability of a daily driver. It is also mechanical and not very complex, so there is little chance of having any reliability issues. The final attribute of an FMU, that has make it popular, is its ability to be easily recalibrated (for a relatively low cost) to match the injector choices you make.

Find your FMU parts here!

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NEW! Paxton PowerHat

The New Paxton Carburetor PowerHat Uses Diffusion Technology To Blow Away The Competition

Single Inlet PowerHat

Dual Inlet PowerHat

In our quest to consistently bring our customers the highest quality of forced induction technology products, we are proud to bring you the new Paxton PowerHat™. The PowerHat™ is a cast aluminum carburetor hat assembly designed to work on “blow-though” applications with Quickfuel, Demon or Holley 4150-type 4 barrel carburetors with mechanical secondaries (may require rejetting/minor carburetor modification). Featuring a low-profile design measuring only 3.2? in overall height, and permits near 360 degree rotation for universal fitment. The integrated air management features and diffuser element reduce jetting and other issues associated with tradional “carb hats”. Available in single entry or dual entry designs, each with 3? diameter inlet port/ports. Includes sealing gaskets and all necessary mounting hardware for attachment to Holley 4150-type carburetors (standard 5? filter mount).

Designed to work on normally aspirated and boosted “blow-through” applications. Supercharged “blow-through” applications may require rejetting/minor carburetor modification. Compatible carburetors include Quickfuel, Demon, or Holley 4150-type 4 barrel carburetors with mechanical secondaries. Recommended carburetor for most applications: Quickfuel Part Number: Q-750-BAN.

Contact to get yours on order today.

Single Inlet
8PM106-011 Satin Finish Single Inlet PowerHat – Click Here
8PM106-018 Polished Finish Single Inlet PowerHat – Click Here

Dual Inlet
8PM106-021 Satin Finish Dual Inlet PowerHat – Click Here
8PM106-028 Polished Finish Dual Inlet PowerHat – Click Here

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Paxton NOVI 2200 Supercharger Kit with Air-To-Air Intercooler for 2011 Ford Mustang with 5.0L

Complete Paxton supercharger systems and tuner kits for the 2011 5.0L Mustang GT are shipping now. The complete, fully calibrated system will boost your stock 2011 GT to 615 HP and 475 lb/ft torque with 7.5-8.5 PSI from the NOVI-2200SL supercharger.

If your vehicle already has modifications or you would like to custom tune your installation for more horsepower, you can purchase a tuner kit and supply your own fuel components and calibration. The NOVI-2200SL supercharger is capable of up to 1000HP on highly modified vehicles with custom tuning.

Kit details

  • Flywheel horsepower/torque: Stock – 412/390 Supercharged – 615/475
  • Manifold boost pressure with supplied pulleys: 7.5-8.5 psig
  • V-3 Si-Trim Supercharger with 3.80” Supercharger drive pulley
  • Supplied SCT programmer re-flashes the factory ECM with a safe, custom calibration for 91-octane fuel.
  • Fuel management upgrade includes:
    • fuel rail spacers
    • high flow replacement fuel injectors
  • Air inlet assembly includes rotomolded ducting that mates to OEM airbox for future 50-state emissions legality, and is also compatible with many aftermarket cold air induction systems (including Vortech High-Flow Cold Air Induction Kit – P/N 4FQ112-060)
  • Billet aluminum and steel supercharger mounting bracket assembly includes idlers, drive belt and all necessary hardware. Mount features multiple idler locations for a wide range of belt and pulley fitments.
  • Air discharge components includes:
    • 24” x 13” x 3.5” welded air/air charge cooler core
    • 3” aluminum mandrel bent charge tubes for high flow and minimal weight
    • 98mm I.D. MAF Housing configured for blow-through use
    • Integrated air straightener upstream of the MAF housing for smooth idle and improved drivability
    • Vortech Maxflow Race Bypass Valve with filter
    • All necessary sleeves and clamps
  • Installation time is rated at 8-10 hours
  • 3-Year/36,000-mile powertrain limited warranty optional (term is from vehicle original in-service date)
  • Optional alternate size supercharger pulleys available

Can be purchased at (Tel: 818-518-9889)

Click here for more info

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Paxton NOVI 1200SL Supercharger Kit with Air-to-Air Intercooler for 2010 Chevy Camaro SS

Complete kits include everything necessary for a bolt-on and go installation on a stock vehicle. Already got a few modifications? No problem! Just pick up our “Tuner Kit”, and take it to your local dyno tuning shop to get the car all dialed in.

Complete system with NOVI-1200SL self-lubricating supercharger adds 47% more horsepower with 6.5-7.5 PSI at the stock redline.

Systems includes:

  • Multi-plate supercharger mounting bracket assembly. Features:
    • Billet aluminum front and rear mounting plates
    • Laser cut steel intermediate plate for increased rigidity
    • Billet aluminum spacers and high-grade hardware
    • Dual position automatic belt tensioner mount
    • Front plate configuration allows for simple change to manual idler adjustment for use with “cog-drive” applications
  • 10-rib supercharger drive design allows for maximum belt traction and stability. Features:
    • 3.80” drive pulley
    • Dedicated (stand alone) configuration
    • Steel SFI-approved race-spec replacement damper (ATI Performance Products)
    • Heavy duty automatic drive belt tensioner
    • Hard anodized billet aluminum idlers with dual bearings
    • Hard anodized billet aluminum 7” crank pulley
    • Premium 10-rib drive belt
  • Air inlet assembly. Includes:
    • Custom roto-molded ducting. Maintains 4” diameter equivalent cross-section throughout. Locates filter behind headlight for cooler inlet air temperatures
    • Silicone sleeves
    • Stainless steel clamps
    • High-flow air filter
  • Discharge and charge cooler assembly. Features:
    • High-capacity welded aluminum charge cooler core (15.6”H x 20”W x 3.5”) is capable of supporting at least 1000 HP.
    • Aluminum Vortech Race compressor bypass valve
    • Silicone sleeves and stainless steel clamps
    • Mandrel bent 3” aluminum charge tubes for high flow and minimal weight
    • 4” aluminum throttle body inlet duct and billet aluminum MAF housing
    • Integrated air-straightener provides laminar flow through MAF for OEM idle quality and driveability
  • Fuel system upgrade. Includes:
    • High flow 66 lb/hr replacement fuel injectors
    • Custom injector o-rings
    • “Plug and play” harness adapters
  • ECU reflash tuning
  • Installation time on these systems is 12-16 hours

Can be purchased at (Tel: 818-518-9889)

Click Here for more info

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Paxton Novi 2500 Supercharger Compressor

Anyone who has ever been dealt a loss from a Paxton blown performance machine knows that the NOVI takes no prisoners. Well, the list of hurt feelings is about to get a lot longer thanks to the NOVI 2500. With up to 30psi on tap and over 1,300 horsepower support in a perfectly streetable package, the NOVI 2500 is ready to take your vehicle’s performance to new levels of street/strip supremacy. Either get yours today, or you’ll quite literally get left behind! Specifications:

  • Internal Gear Step-Up Ratio: 3.50:1
  • Inlet Hose Diameter: 4.00
  • Outlet Hose Diameter: 3.00
  • Efficiency Peak: 78%
  • Impeller Speed Max: 60,000 rpm
  • Max Boost Pressure: 30 psig
  • Max Flow: 2000 cfm
  • Max Horsepower Support: 1,300

Can be purchased at (Tel: 818-518-9889)
Click Here for more info

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