2015 R59 Cooper S Roadster. N18 motor.
After accelerating, when I lift off the throttle either to shift or slow down, I feel a slight surge of acceleration for just an instant before the revs start to come down. It’s not scary or anything like that. Just something I’m noticing as I get more familiar with the car.
Is this unusual, or a symptom of something? Or just a characteristic of the electric throttle system ? Anyone else feel this ?

 

Wastegate not opening, maybe?
Mine's not a turbo, so I can't say with any certainty

 

I can't say I've experienced that. How subtle is this?
There could be a slight delay but I don't think a surge of acceleration is typical if you lift your foot off the pedal.
Is this with a standard manual gearbox or with an automatic paddle shifter?

 

it’s subtle. If you just got in the car for the first time, you probably wouldn’t notice it. The powerband is kinda notchy on this car. It really kicks in around 3000 rpm. Then when you lift off the throttle you get just another little kick before it slows down. Again, it not scary like “Oh, ****, the throttle’s stuck!” Just a little surge for a split second.

Cooper S roadster, N18. Stock with manual 6-speed.

Thanks for your reply.

 

I haven’t driven a later model N18 vehicle. My guess is you are just sensitive to the nuances of the engine programming, and this is normal behavior. For what it’s worth, I could feel little surges and hesitations on my car, too. If I had the cruise set on the highway and rested my foot on the pedal, I could feel the engine respond slightly to the minuscule pressure of my foot. It was enough to make the engine or throttle react, but not enough to turn the cruise off. Sometimes when we get used to how a car drives, we start to feel the little adaptations.

 

Yeah, that’s kinda what I thought. Just wondering if others had experienced the same thing with this car. Thanks for your reply.