Quote:
Originally Posted by pal
We will get to the bottom of the 7100 rpm dip with AA's help. Lets hope the latest changes they sent me help alleviate the dip and make some more power over stock.
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From looking at the dyno plots of many different posters on this forum, the dip and rebound in the torque/HP plots at around 7,100 - 7,600rpm seems to occur for all, irrespective of cars being run OEM or with mods. I would suggest that this is possibly a result of resonant effects, specific to the Z4M air intake, that occur from the velocity of air when filling the cylinders at an engine speed of around 7,100rpm. Has anyone got dyno plots of the Z4M with Macht Schnell silicone elbow, GruppeM or Macht Scnell/GruppeM combination for comparison?