The 4.6 litre engine as adopted for the 1995-2002 P38 HSE was the final development version of the original Buick engine. Output increased to 225 hp @ 4,750 rpm. In 1999, BMW changed the sequential multiport fuel injection from Lucas to Bosch Motronic 5.2.1, arguably a more refined and reliable system
As with all other engines, actual performance at the wheels will depend upon many other factors - not the least the standard of factory production at the time of build. For example, we have customer's with HSE Range Rovers fitted with stock standard 4.6 engines that will out-perform nominally similar vehicles, especially after receiving our specialised tuning.
The performance data below is for a standard 4.6 litre engine. The lower line is the "first run" prior to tuning. The upper line shows the significant increase in power achieved using the dynamometer as a measurement tool by the Graeme Cooper engineer
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