cooper s r53 acceleration hestitation ?

[bmx]

hi i have had the cooper s for a few weeks now and feel that its not accelerating smoothly. if i floor it it starts accelerating nicely then around 3k rpm it seems to strugle if i keep it floored it gets to 4k rpm and then seems ok.

it seems like there is a running problem around the mid range, has anyone else had this or know what it could be?

[pembo]

Any chance this might be your traction control kicking in? it winds me up something rotten because I just can't pull out of my drive without it cutting out on a busy road so unless it's raining I normally turn mine off.

[Wilburo]

Yeah, sounds like traction control. The supercharger really comes on song from 3k, so that's where it'll overcome grip, causing the traction control to cut power. This will be accompanied by a flashing light on the rev-counter.

If you floor it, the car leans back reducing grip at the front wheels. From low-speeds, try rolling in the power, rather than stomping on it.

[Silent1]

Doesn't sound like traction control to me as apart from 1st gear in the dry my 240bhp mini wont lose grip.

It could be a dodgy fuel regulator as the boost builds up it doesn't react quickly enough.

[mad4mini]

Hya
there is an actuator valve located just under the right hand side of the supercharger intercooler which connects into the intake manifold which can stick and on occations i have had it cause a hesitation/flat spot on hard acceleration not saying this is the fault on your car but its something to keep in mind
Richard

[Silent1]

Err, i've just had a think about this.

I'll wager £20 that your t-map sensor has failed.