DMS my SLK55AMG.
noticeable difference to all out power and the delivery too. Merc state the standard 0-60 of this car is 4.9secs.
Even with the added wieght of Pammy, and a bit of traction issues, it was getting 4.8secs. would have guesstimated it would have done it 4.3 to 4.5secs given good traction.
recorded 164mph at bruntingthorpe. I assume it would have acheived more if it had a longer straight line.
No difference in MPG either way. That purely depended on how you drove at the time.
The car had more midrange power and you could feel it.
The current car, being a diesel, has also had a remap. Massive difference in power. Huge difference on torque too.
And, you have to drive very carefully and not press the throttle much, you can eke out a good MPG. That said, I never gave it a MPG test prior to having it changed.
Until I put a larger bore air intake on it, the levels of smoke at low revs and full throttle were amusing to say the least. As its getting more air, it seems to have better combustion so less smoke. (less being less than amusing levels, but not clean by any stretch).
But certainly makes a mid range difference to this car too.
A non turbo, small petrol engine may only gain 8% or so with a remap. So with, lets take a 100bhp engine, you probably won't notice much, but a stop watch would show it, as would a rolling road.
If you can get a custom remap, you could get it to have more mid range torque, and not bother too much with increasing ultimate power, this may have the desired effect, but will cost.