DESCRIPTION

Page updated 16-Feb-2006
No special tools or modifications required.
10 Hours fitting time, fully reversible.

VF-Engineering is the first to develop and build a supercharger kit with true OEM quality and drivability for the Volkswagen MK4 chassis. It is also the first truly do-it-yourself and reversible conversion kit, using the famous "bullet proof" Vortech Engineering supercharger unit. The key to the design of this supercharger kit is the simplicity with which it can be bolted on. The kit is supplied with every part needed to get your car up and running supercharged on the same day.

The MK4 VR6 24v was made for the US and Canadian markets from 2002>04 combining the VR6 heritage but packed with a 4 valves per cylinder newly designed head. The 24V head was designed by Cosworth Engineering and opened up the VR6's lungs. The equivalent model was released in the rest of the world earlier in 1999. Packaged with the 4 motion driveline and titled "V6 4Motion", the non-US models were otherwise identical. The MK4 24V inhereted all the features from the MK4 12V for example the "egas" also known as "drive by wire" and the plastic variable runner intake manifold. This combination is an evolution of the VR6 engine first released in 1991 in Europe. With its narrow angle V-block and single cylinder head, the VR6 is a powerful and reliable engine design. In stock form, the VR6 is quick off the mark thanks to the variable intake, but looses acceleration at high rpms, making it an ideal candidate for centrifugal supercharging. The VF stage 1 supercharger conversion adds 80hp, and the stage 2 adds 105hp using an air to air high-flow front mount intercooler.

VF-Engineering worked with GIAC engineers to re-tune the ECU which makes this product a comprehensive tuned package raising the VR6 hp rating by almost 50% at the wheels! All testing and development was performed with Californian 91 octane gasoline and dyno numbers reflect this. GIAC engineers extensively re-wrote the ECU software using their own binary, assembly and disassembly algorithms written from scratch. Testing the software included extensive road and dyno test cycles, with acceleration and deceleration tests for driveability smoothness and ECU fuel management. All test cars were put through long term full throttle testing in conditions varying from wet cold climates to hot dry Arizona desert temperature for safe-optimal air fuel ratios and knock activity monitoring. Competently-written ECU software has allowed VF to fully explore the potential of the VR6 engine. In tests using higher octane pump gasoline, power output increased by an additional 5% and even higher with high octane race fuels.

Performance, reliability, and stock feel are major factors in the extensive R&D carried by VF-Engineering in Europe and the USA. The custom proprietary VF.GIAC software supplied with this kit safely re-aligns all fueling and engine management parameters. Unlike other forced induction solutions, VF-Engineering's kit is designed to work safely within Volkswagen's OEM parameters thus minimizing the likelihood of spurious DTCs (Diagnostic Trouble Codes) or Check-Engine Lights.

Every aspect of this kit has been fully engineered for high quality fitment and highly demanding performance and expectation. VF's in-house horizontal, turning and milling CNC's and plastic molding plant, GIAC's industry reputation and track record, and Vortech's reliability have been fully exploited to create a product with internationally un-rivaled material technology, quality, and performance.    

Not all chassis dynos produce comparable results which is why it is important to consider the "delta", or relative power increase, measured on the same dyno before and after modification. Power gains shown by VF have been found to be accurate on test vehicles on 91 octane, with stock setups (i.e. throttle body, exhaust system, cams, etc.). The GIAC software adapts just as the OEM software and a slight increase in performance may be expected from the use of higher quality fuels such as 93 octane.

SPECS

VW Golf/ Bora V6 Stock vs VF Dyno 24v

Stage 1 • Product launch 01 Feb 03. • GIAC custom tuned stage 1 & 2 software • RPM limiter increased to 7000 rpm • Soft rev limiters completely removed • Increased SC pulley belt wrap • Additional idler pulley bracket for high boost stages • Bosch OEM pressure relief bypass systems • Polished ceramic aluminum coated mandrel bent pipework • 6061 Billet aluminum CNC bracketry • Polished ceramic aluminum coated pipework • 4 ply silicon couplers with OEM screw clamps • Army-Navy swivel fittings with high pressure OEM oil lines • Proprietary Gates OEM serpentine belt • Stage 2 high capacity Bosch fuel injectors • 1 year unlimited mileage warranty on major parts • Optional 2 year warranty extension to 3 yrs for $150 • Precision Made in California, USA Stage 2 Upgrade • Boost increase from 6 to 8 psi • 3" High flow intercooler rated to 500hp • Additional billet tensioner idler and bracket • High flow custom Bosch injectors to fit under the stock manifold • Re-calibration housing for MAF • Custom in-tank direct replacement OEM high flow fuel pump (rated to 420+hp) • An additional pressure bypass system

Understanding Dyno Charts

A unique advantage of all VF-Engineering products is the (optional) 3 year unlimited mileage warranty coupled with lifetime software support and world renowned customer service.

"We removed a competitors supercharger kit off the blue test car and found fitting the VF-kit to be so much simpler and well thought out. The quality of the hardware is immediately noticeable and looks so much stronger. We were pleasantly surprised on the test drive and highly recommend this product."
- NS Racing (UK Distributor)