Bazzaz Z-Fi Fuel Control Unit and Air Fuel Mapping Kit

Jun 03, 2013 View Comments by

Bazzaz Z-Fi Fuel Control Unit and Air Fuel Mapping KitWith a relatively light weight, low center of gravity, excellent suspension, and a hard-charging V-twin motor, my 2008 KTM 990 Adventure is a joy to ride on twisty tarmac. But the twitchiness of its throttle response has made the bike a handful when off-roading. Installation of a Throttle Tamer and several other tweaks only made slight improvements. I was contemplating a newer model KTM Adventure, which reportedly had solved most of the throttle twitchiness issue when Bazzaz made available their Z-Fi Fuel Controller Unit and their Air-Fuel Mapping Kit. One of the claimed benefits of the unit is a smoother throttle transition, which immediately piqued my interest.

How it Works
The air/fuel ratio (AFR) on fuel-injected bikes is controlled by the motorcycle’s engine control unit (ECU). The Bazzaz Z-Fi controller mates with and intercepts electronic signals that the ECU sends to the motorcycle’s fuel injectors, allowing them to be fine-tuned for enhanced performance. The precise data for the changes is stored in the Z-Fi fuel controller in the form of a fuel map. The unit comes pre-programmed with a baseline setting for specific makes, models, and years of bikes. The programming can then be adjusted for optimal performance.

Installation
The Fuel Controller (Z-Fi) and the Air Fuel Mapper (AFM) units come with the specific wiring harness and air/fuel sensor required for each bike; OEM style connectors are used to ease installation. Although the system is billed as ‚ “plug and play” some disassembly and reassembly of motorcycle components is required to do all of the necessary ‚”plugging,” before the ‚ “playing” can begin. Installation time is around three hours. Although I had a professional mechanic do the installation, in retrospect, I could have done it myself by following the excellent directions and technical support provided by Bazzaz.

Tuning
A USB interface allows the Z-Fi unit to be connected to a laptop computer. The fuel-mapping software currently runs only on a PC, but a Mac application is in the works. The Bazzaz system has the ability to map itself. The optimum fuel/air mixture is computed for each increment of 500 rpm (from 3000 rpm on up) and for each 10 percent increase in throttle position opening (starting at 5 percent and up to 100 percent).

After riding the bike for approximately 20 minutes and then plugging the unit back into the laptop, the software suggests fuel percentage adjustments to the baseline fuel map. The image is displayed on the computer screen as a matrix of percentage throttle openings on one axis and rpms on the other axis. After accepting the recommended adjustments, the process of riding the bike for 20 minutes is repeated. This second set of adjustments further refines the air/fuel programming. On a trial and error basis, I then manually programmed 5 percent and 10 percent throttle openings for 1500, 2000, and 2500 rpms. These last adjustments further enhanced low rpm throttle response. I made liberal use of Bazzaz technical support, which was exceptionally helpful, patient, and friendly.

Results
The smoothness and tractability of power delivery from my KTM 990 Adventure, particularly at lower rpms, improved dramatically. This project, which can be performed without expensive dynamometer tuning, was time and money well spent.

Bazzaz Z-Fi Fuel Control Unit: $349.95
Air Fuel Mapping Kit: $299.95
www.bazzaz.net

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