Originally Posted by OneM
Hmm.. don't know about about you guys, but I sure can feel the turbo lag. Even Tiff mentions it on 5th gear.
Sure the lag is not like those on a WRX or basically small displacement engines using high pressure turbos... but its noticeable, mostly without the 'M button' pressed. And that's due to the waste-gate being open.
This has been talked extensively recently, here is the thread "Lag or No Lag":
I also agree that there is small but noticeable lag especially with M button not pressed, but really not a big deal.
Summary of known cures to minimize it: catless downpipes (works for sure), high flow mid pipes (slight but noticeable gain with N55 or Maddad mids reported), better charge pipe (ER charge pipe is reported for good gains), better intake (arguable, differing experiences reported). Also, in combination with a good tune like Evolve's, a more performant intercooler with better piping should help as well; but for a stock car an intercooler may actually be counterproductive.
"The mark of a great car is one whose overall competence exceeds what you should expect from its individual components and the 1M does just that", Chris Harris.
BMW 1M-SOLD-: TECH: Evolve Race+N55mids, Evolve IC, Michelin PSS, ER cp, aFe filter, CDVx, Vorshlag camber plates, BMS OCC EXTERIOR: trunk spoiler, blacklines, black grills, IND goodies INTERIOR: Alcantara steering wheel, steel pedals, custom mats, MPower e-brake.