Hmm.. Guess that blows up that theory then!
It's just that on the normally aspirated Cooper, I have noted that the air-con affects my throttle response in an unusual manner - I get a surging feeling when driving with light throttle on a downhill gradient, and over-revving when I lift off at high RPM.
It's also noticably less torquey pulling away at low revs.
Somebody else posted something similar in another thread about over-revving when the a/c unit is on.
It's an unproven rumour, but it was once said that the engine electronics advance the throttle slightly to make up for the air-con being on.
Yes, I've noticed this also, particularly in second gear, but I think it's most noticeable during light-to-moderate acceleration, and not very noticeable under heavy acceleration. It's not very severe on my S, so it's more of a curiosity than an annoyance (unlike the cold start problem).
My MC has graduated from yo-yoing to become an experienced master of 'nearly' stalling infront of large and fast moving objects
It occurs under brisk (read 'required for conditions') accleration from standstill, often across the path of fast traffic (junctions, roundabouts, etc.),
traction either on or off, without dumping of clutch
One holiday, 9 whole days at dealership (four seperate trips), 4 seperate test drives with me and 1 mechanic / 1 service assistant / 1 workshop supervisor and 1 servicing manager (fault occurd everytime during test drives),
1 (pleasantly surprising) chat with the dealership head honcho and - lo and behold they are able to see that there is indeed a fault and it was getting worse (lower rpm).
They originaly decided to wait a month for some area guy from BMW to come and test drive it
I decided not to accept it until the problem is found and fixed, but it gives me time to pretend to be a gangster in the new 5 series they gave me until then
I have it on my S also in 2nd/3rd gear under medium acceleration. Talking to the dealer today, the service folks were saying that they needed the updated Engine Management software to come over before they could sort it out - could be a couple of months. Something to do with the DME - whatever that is.
ANyway, I'm going to talk with them again monday and see if I can get more information on it and if so, will post. Unfortunately I am acouple fo hours away from the dealer so can't run it down for test too easily.....
Yep mine does it too. Never on mild or hard acceleration, but I feel it (quite subtle) on medium acceleration. I thought it was a quirk of the e-gas pedal, optimizing the whole air/fuel/spark thing for best efficiency from millisecond to millisecond. Doesn't really bother me, but I did notice it. Mine seems to do it regardless of hot or cold, but it's quite subtle on our car.
Chilli Red/White Cooper S, Sport Pack & Sunroof. Delivered June 12th, 2002!
Now with MCS Winter Tire Package.
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