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URD Mk3 Supercharger Kit, Stage I 2007-2009 FJ Cruiser



URD worked with a new start up company, iTronix Technologies, to meet our specific needs with a highly advanced self tuning engine management system for our high power supercharger kits.  It is called the UCON Flex.

iTronix exceeded our expectations and developed an EMS that is significantly better than what we had been using.

Key Features

  • More power than any other supercharger system
  • Rotrex C38-81 Supercharger
  • Advanced Engine Management using UCON Flex by iTronix Technologies
  • Huge 61# fuel injectors and 255 LPH fuel pump
  • Silent Operation
  • Turbo style blow off valve
  • Large air-air intercooler
  • Outstanding fit and finish
  • Easy installation
  • Off road snorkel compatible
  • Off road winch bumper friendly
  • URD has been supercharging FJ Cruisers since 2006
  • URD was the first to develop a supercharger kit for the FJ

Kit includes

  • Rotrex C38-81 Supercharger w/80mm pulley
  • Self contained Rotrex oil system with large oil cooler
  • Custom length drive belt
  • Precision charge piping made from mandrel bent aluminum
  • URD 255 LPH fuel pump/filter kit
  • Denso IKH24 Iridium Power spark plugs
  • All stainless fasteners where possible
  • All silicone couplers with quality stainless liner clamps
  • HKS SSQV turbo style blow off valve
  • Drive belt idler pulley
  • URD supercharger mounting bracket
  • URD custom air filter box with large panel type filter
  • High volume 61# fuel injectors with adapter harnesses
  • Advanced engine management using UCON Flex self tuning engine management system
  • Exhaust cam timing gears
  • Very detailed installation instructions

URD has released the latest updated version of our advanced supercharger system for the FJ Cruiser.  Our original supercharger kit debuted in the Toyota/TRD booth at the SEMA show in 2006.

This updated version features a large air-to-air intercooler to cool the compressed air from the supercharger for greater power potential.  The mounting of the intercooler is high in the grill area to make it more compatible with off road winch bumpers.

The most important improvement is a significant increase in power.  Our development vehicle was a 2007 FJ Cruiser with a manual transmission.  The manual transmission versions are permanent all wheel drive and can be locked in traditional 4 wheel drive for use off road.  To dyno this vehicle we had to dyno it in 4 wheel drive using a 4 wheel drive DynoJet dyno.  The stock vehicle dynoed at 188 Wheel Horse Power (RWHP).  The basic kit, Stage I, put down 325 RWHP and the upgraded kit, Stage 2, dynoed at 370 RWHP, doubling the stock power output.

The key to producing this power level safely is in depth calibration work using highly advanced engine management and a properly configured fuel delivery system.  For engine management the kit uses the UCON Flex Advanced Engine Management System that is self tuning with active dynamic air fuel ratio correction.  The UCON also has engine protecting engine guardian features.  If things start to go wrong the guardian features step in and depower the engine to protect it.  If the air fuel ratio deviates from the programmed value and the dynamic active fuel control cannot correct it, the guardian will depower the engine to protect it.  The guardian feature also steps in if the engine begins to overheat and we also program it to limit the maximum RPM until the engine is properly warmed up.

The fuel system includes a large 255 liter per hour fuel pump that is installed in the fuel tank and high flow fuel injectors that are more than twice the flow rate of the stock ones.  These upgrades are required to ensure a sufficient supply of fuel is delivered to the engine as commanded by the UCON Advanced Engine Management System.

URD has chosen the highly efficient Rotrex C38-81 supercharger as the center of this revised supercharger system.  The Rotrex is most advanced supercharger design on the market today.  It features a small compact foot print with almost completely silent operation, with a very highly efficient traction roller drive system that will spin the turbo type impeller 7.5 times faster than the belt drive pulley is turned.  This high step up ratio and small diameter turbo style impeller brings boost in sooner than other more common types of centrifugal superchargers.  This gives you very nice off the line performance combined with unmatched top end power.  The Rotrex Supercharger features it own self contained oiling system using Rotrex\’ proprietary traction oil that is the key to the advanced traction drive system.  Rotrex warranties their superchargers with an industry leading one year UNLIMITED mileage warranty.

The air intake system brings in cool air from the stock location in the fender wall and into URD\’ custom high flow air filter box with a very large flat panel air filter for unrestricted flow into the supercharger.  In our previous version, the only complaint was the system was not compatible with the popular off road snorkel systems.  This oversight was corrected with the new Mark III version.  You can easily adapt it to your favorite snorkel system, but you may have a reduction in peak power with the added restriction to the intake.

The overall operation of the supercharger system is nearly completely silent, but we have added a turbo style blow off valve will announce that your FJ is indeed boosted.  When the throttle is suddenly closed when the engine is at high RPM like shifting gears with boost, the blow off valve will cycle with a very crisp note typical of high performance turbo systems.  It is always a crowd pleaser!!

The kit includes all the needed brackets, parts, and fasteners to allow a trouble free, no hassle installation.  We include high quality stainless fasteners and all the parts have a high quality wrinkle black powder coating finish that will last and looks fantastic.  The piping is all mandrel bent high quality aluminum they fit like they are supposed to.  Only the best in kit components are used.

Installation will require some trimming of plastic parts inside of the stock bumper assembly.  We made every effort to make the system compatible with off road winch bumpers.  We can\’ guarantee compatibility with all bumpers on the market, but we did test fit it with the popular bumper from Demello Off-Road and a slight amount of trimming to the internal brackets was all that was needed for a perfect fit.  No permanent modifications required to install this system and it can be easily removed when you decide to sell or trade your FJ Cruiser for a new one.

This kit is not CARB approved and is legal in California for off road and racing use only.

Year Make Model Engine
Year Make Model Engine
2007 - 2009 Toyota FJ Cruiser V6 4.0L 1GR-FE
Weight 87 lbs
Dimensions 36 × 24 × 13 in

2 reviews for URD Mk3 Supercharger Kit for 2007-2009 FJ Cruiser, Stage I

  1. Haythem

    Thank you so much for this kit it is amazing and completed. The result is more than excellent and I have never thought my FJ will have this power ….

  2. Luke Duran

    This will blow your mind on how strong the boost can come on, and is a serious power upgrade! Excellent quality and fit and finish,and is exactly what you can expect from all URD products! Good Job, and excellent customer service!

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