Development of the Zonker
The ZONKER is a 16v GTI prototype from VW Sport. The big difference is that it features All Wheel Drive and an ABS brake system. It was an evaluation vehicle for things to come from VW. It is a one-off, Ferrari yellow, concept vehicle based on a 16v GTI. This unique concept car was the forerunner to the Rallye Golfs.
Nicknamed Zonker, the two door GTI was built at the assembly line Volkswagen AG's, advanced Halle 54, production facility in Wolfsburg. Unlike standard U.S. GTI’s , the Zonker is equipped with VW’s permanent four-wheel drive viscous system called Syncro and a VW/Teves anti-lock braking system.
After assembly, the Zonker was sent to Volkswagen Motorsports’ facility in Hanover, Germany, where it was fitted a high performance, 16-valve engine, complete with U.S. emission including catalytic converter, and a close ratio, five-speed gearbox. VW didn’t stop there. Shortly after the car’s arrival to the states it was taken to Callaway Cars of Old Lyme, Connecticut. There a Garret turbocharger and custom intercooler were added. The 16-valve engine, now developing about 219hp, and Syncro 4WD combination made the Zonker the only vehicle of its kind in the world. These documents from Callaway presented to VW Sport give a great insight into the development of the Zonker. 1987 VW 16 Valve Turbocharger Development Program, 1987 VW 16 Valve Turbocharger Design Philosophy, and 1987 VW 16 Valve Turbocharger Dyno Approach.
In addition to the installation of the engine and transaxle, VW Motorsports also revised the spring rate and re-valved the struts to lower the vehicle’s ride height by about 1 ½ inches. The Zonker also has BBS one-piece wheels and a BBS front spoiler, rocker panel extensions and a new rear apron. European bumpers and mirror housings have been painted to match the body color. The European quad headlight grill with GTI & Syncro badges round out the list of exterior changes.
Inside, the one-off GTI shows a 220-kmh speedometer and Callaway boost gauge. The seats are custom leather RECARO's with adjustable thigh bolsters. Leather is also found on the rear seats and headrests, door panels, sport steering wheel and shift knob & boot. Power windows and central locking system are also standard features.
