i think MB set a limit which is achievable and is generally way beneath the engines parameters. this will reduce the stress on it and lower any expected warranty issues. its possibly the best compromise the manufacturers use wieghted possibly on MPG or emmisions.
Most people will be happy with the normal performance. But those of us who wish to explore it somewhat, have to take the risk that it will affect the warranty, cost more insurance and will set the parameters closer to the limits which induces the risk of breakage. It will use more fuel while you are exploring the limits of the cars new found levels.
The MPG increase is nominal as it is based on the fact the Torque is increased. So if you drive your unmodified car at a set rate in a set gear over a set distance, say 30miles at 2500rpm in 5th/6th ot 7th if you have it. then by having additional torque will mean that you could drive the same distance either in a higher gear as the torque will allow your car to do the same speed or it will means you dont have to change down as often to maintian momentum. This should not make any differnce at all if you were on the level doing a fully sorted fuel economy run, but rather you are in the real world on a motorway trying to maintain a steady pace through the undulations etc.
so if you use the torque correctly you will gain MPG in that area, If you use the power you will see a power increase but will use more fuel. but you wont see more performance and better fuel economy on the same day.
you may gain 1 or even 2% but in reality, you boot if from a -b more coz you feel the extra torque at less than econimical speeds. In mine the after modification makes itself felt noticable between 70 and 125 where it doesnt start to lose the acceleration like it did before, after 125 or so, the extra power is only noticable on paper. ie it may do 180 rather than 176, you may notice it on a stop watch but you wont feel the difference that much. well thats with mine anyway, and it is more responsive to throttle pedal inputs than it was before.
I know what I am trying to say and I am just wondering why i tried to write it down. Coz it looks bollox.
