The DFR, a development of the customer DFZ engine used by various teams in 1988, was reportedly the most powerful non-turbo engine, producing approximately (compared to around for the DFZ). Six teams – McLaren and Lotus with their Honda engines, Ferrari produced around version of their 1987 engine (though early in the season power output of the Ferrari V6 was only around 620 bhp), Arrows with their Megatron engines, Osella with the old Alfa Romeo 890T V8 turbo re-badged as the "Osella V8" which produced around (the most powerful engine on the grid, but nowhere near the class of the Honda or Ferrari and often proved slower than the DFZ V8), and Zakspeed with their own 4cyl turbo (though like the Osella, such horsepower was wasted by the small German team) – decided to build one last turbo car to make the most out of their experience using such engines, despite the aforementioned restrictions.