The FAST XFI 2.0 brings a ton of valuable new features to the already excellent standalone EFI system. After a full year's worth of research, track testing and data gathering by FAST racers and engineers, the 2.0 upgrade represents an evolution of the box, adding several brand new controls and refining a couple of existing tables. For those tuners familiar with the standard FAST XFI, you will be pleased to know that the new 2.0 software looks and feels exactly the same even though it boasts a slew of new advanced capabilities and improved functions. Beginners to the XFI software will enjoy the same easy-to-use interface that made FAST famous and can also rely on great documentation and new classes, like the one from EFI University that we attended, to help get them up to speed.
No matter your level of expertise, both experienced tuners and beginners alike will enjoy the new Self Learning Auto Tuning VE table, which FAST engineers built to allow for a completely automated process that makes for quick and easy VE mapping. Now, this is not meant to replace a competent tuner, but with the help of a load bearing dyno (or some street time), the XFI can hone in on a base fuel table quickly (using a wideband oxygen sensor and closed loop tuning), saving any tuner time and aggravation. The Auto Tuning VE function can even be configured to turn on and off automatically depending on conditions, which is a great feature for anyone street driving with an XFI and racing in the same car.
For the turbocharged racers, the XFI 2.0 upgrade will allow access to an all new time-based boost controller, among several other new tables, which allows for time-based boost control using several all-new control strategies, the most exciting of which are the two new closed loop variations. In Analog 8 mode, the ECU will monitor pressure atop the wastegate and automatically adjust the duty cycle to the solenoid to maintain targets entered in the Boost Table. For example, a racer wanting 6 psi of wastegate pressure would enter 25 on the Boost Table, a number derived from the helpful and included XFI Boost Table Settings chart. For those racers more comfortable with setting closed loop control using a MAP sensor and telling the XFI target boost pressure, instead of wastegate pressure, the XFI 2.0 software can easily monitor the MAP sensor and control duty cycle based on those readings instead.
Nitrous racers also benefit from the 2.0 update, with new progressive power adder controls that include configurations for both wet and dry nitrous systems. Pulse width modulation control is available for ramping in kits progressively and separate nitrous and fuel control allow tuners to fine tune every aspect of a nitrous system through the XFI 2.0 box. A dry nitrous fuel delay table is now present in the software along with a tuners choice of a fixed power adder target air/fuel or a standard air/fuel table.
Much to the dismay of transmission builders around the country, XFI 2.0 also brings additional transbrake control on-board, with the ability to creep the car on the 'brake allowing for consistent and simple staging, especially with difficult to spool or stubborn turbocharged cars. The famous FAST Intelligent Traction Control (ITC) features a new user adjustable delay table that ignores starting line mistakes and can be programmed in both Heuristic or PA mode, both of which require a driveshaft speed sensor to work correctly. Other new features include several correction tables, including adjustable battery voltage vs. injector offset, spark advance vs. coolant temp offset and a new target air/fuel vs. coolant temp table. Besides killer control over the range of an engine's operation, XFI 2.0 also brings improved on-board diagnostics and an all-new automatic and manual TPS calibration system, which allows for quick and easy setup on any vehicle.
Obviously, the 2.0 update represents a ton of work by FAST's engineering team and significant research and development by FAST racers and tuners alike. To find out more about the upgrade, we sat in on EFI University's Fundamentals of High Performance Engine Tuning Using the FAST XFI ECU and took notes to report back to you. Follow along with us on the next couple of pages to see more or head on over to EFI University's website to see if you can find a class near you.