laggy/lack of pedal response acceleration

[vinsanem5]

Sometimes when Im driving it seems like my car loses any throttle response when pressing down on the pedal. I could be at a light or stop sign and trying to give it gas and nothing for a second and then all of a sudden its surges like I smashed the pedal down. What can be the cause? MAF, injectors or HPFP?

[bongshi4]

Vacuum leak could result similar behavior. Check your exhaust valve hose first.
Secondary vacuum reservoir supplies vacuum to the exhaust valve and also turbo wastegate!!

[Gel2al2d]

Originally Posted by vinsanem5

Sometimes when Im driving it seems like my car loses any throttle response when pressing down on the pedal. I could be at a light or stop sign and trying to give it gas and nothing for a second and then all of a sudden its surges like I smashed the pedal down. What can be the cause? MAF, injectors or HPFP?

Is this your first DCT car? honestly, I dont think anything is wrong. I was thinking the same when I first got my M but I took it to Autotalent and I had them drive it. He told me to press the pedal more linear rather than just stepping on it. Ive had to adjust my driving style but it has made starting off from a dead stop a little bit more livable.

[chris_mauck]

Originally Posted by Gel2al2d

Is this your first DCT car? honestly, I dont think anything is wrong. I was thinking the same when I first got my M but I took it to Autotalent and I had them drive it. He told me to press the pedal more linear rather than just stepping on it. Ive had to adjust my driving style but it has made starting off from a dead stop a little bit more livable.

I second this OP. I had the same "issue" with my M5 (my first DCT) that wasn't really an issue. The DCT pre-selects gears to decrease shift times and sometimes if it pre-selects the wrong gear, like you mentioned at slow speeds, stops, etc it can take a second for the gearbox to catch up with the throttle input.

Also one thing I recently learned is that these DCT's act like they are in neutral when you come to a stop. From a stop, with your foot off the brake and pedal, you can then tap and release the pedal and the car will idle forward like a normal automatic trans does.

I think if you give it too much throttle when the DCT is in that "neutral" state it lags like you were saying and then jumps forward.

Once I learned the above I just started to tap the pedal to get going, wait for the car to engage and start rolling, then you're good to go.

[Craze]

Everyone said smg was crap but honestly i dont find the bmw dct that great

[Gel2al2d]

I hate the DCT from a dead stop BUT everything after that is great. Coming from my wife's RCF, the M5 shifts so much faster.

[Aceway]

Does it do the same thing with traction control turned off?

[F10CPROG]

Mine is abit like this on occasion, putting the throttle into "sport" stops this... i think its just the car trying to be abit efficient haha