The 3.9 litre engine was first released in 1989, delivering greater power and torque than its 3.5 litre predecessor. Combined with an improved fuel injection system, power output was increased to 178 @4750 Hp, up from 150 Hp for the earlier 3.5 litre
Actual performance at the wheels will depend upon many other factors - the vehicle model, drive train, exhaust mods and variances in factory production etc. For example, a 3.9 engine in one standard Discovery 1 might produce 5Kw more (or less) power than a nominally identical vehicle.
The chart below illustrates the performance gain (upper line is "after tuning") achieved on a standard 3.9 litre engine using our dynamometer. Of course, the optional addition of an aftermarket engine management system like HALTECH allows the Graeme Cooper engineers to further boost power, as well as optimising the power to economy ratio.
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