Quote:
Originally Posted by Froglet
I have an E90 M3 DCT and I noticed that sometimes the throttle response is pretty sluggish. I get this, maybe obviously in D2, but I also noticed that sometimes when driving with D4/D5 it's still pretty slow. In D4/5 I would expect it to respond pretty quickly to when I slightly touch the accelerator and it does appear to want to do something, but it seems to choke/gurgle and if I press the accelerator a bit more it all of a sudden takes off like crazy which could be pretty dangerous in some situations.
I have read about throttle actuators but I don't seem to have any other symptoms (like car stalling when stopping for a traffic light, having irregular rpms at cold start or getting error codes - I read those are some symptoms...). When I drive using the paddles/stick and accelerate in any gear it responds very well to whatever I do with the accelerator... Any ideas?
Could it be the rod bearings?........ Just kidding  |
I have observed the same. The power delivery can be quite inconsistent.
I have my own theory. If you drive the car above 60 mph for 45 min it will respond much more favorably after that. Unfortunately the DME continuously adapts the engine map correction factors to your driving style and shoots for minimum emissions, and preserving engine wear, not performance (even with power plus mode which only scales the throttle). Unless you floor it that mid level performance is ellusive.
If you do normal driving like you would in most road driving, the DME tries to protect the engine by running rich and giving you shitty performance at in moderate engagements. Highway driving will make it run more lean and bring back more performance in transitional driving.
So the only solution I found is to make some weekend trips. Unfortunately the effect dissipates after a few days.
note that this layer of control is lower lever and no remap or tune will stop the DME from doing that. I hate those software adaptation that are taking control away from the human driver. Same thing creeped in dct.