In Reply to: Info for those not satisfied with 400 HP.. posted by Tom on June 23, 1999 at 05:30:14:
What 'electronic protection' is this? Raising or removing the rev limiter will not achieve anything (except a melted V8) as the reciprocating parts have a natural rev ceiling. Some tweaking could boost the power further by stipulating the use of premium fuel only, but not 80 bhp's worth. To achieve a gain of the order of 80 bhp (20% in this instance) you would need to lighten and balance the bottom end, upgrade the valvegear (which itself robs bhp), fit a bigger throttle body and manifolds, retune the ECU, optimise the power take-off to minimise power losses to air-con compressor, alternator, etc.
BMW has every right to be 'afraid' of poor reliability. Its reputation is partly based on reliability and won't jeopardise this for the benefit of a few who feel they have been 'cheated' out of what they deserve. Besides, 400 bhp is an adequate figure already, and it would be best to drive the car first before deciding whether it is underpowered or not.
: A car-modifier specialist told me that when you remove the electronic protection of the M5 E39 engine (and speed limiter), the engine has 450-480 HP. This seems obvious when you see the low yield of the serial engine (80 HP/litre, M3 100 HP/litre)
: BMW locked it at 400 HP, being afraid to not have enough reliability with this car.
: M5 E39 owners, why not 80 HP more ??