does lid airbox stay closed with cold temperature?

[NZ_M3]

Originally Posted by BMsport.com

And even if it was alpha n, the air flow would still be controlled by the throttle valves, not the flap.

This I agree with (unless the DME was clever enough to also read the flap actuator and run different mappings for an on/off position (unlikely I know) ... I just thought your MAP sensor comment was at odds to what I understood about the CSL fuel injection system.

[BMsport.com]

idle control part no. 13 41 1 733 090

[NZ_M3]

Originally Posted by BMsport.com

idle control part no. 13 41 1 733 090

Yeah I saw that ... cheers.

So the CSL is not a true Alpha N set up?? Or does the MAP sensor on the air line only come into play for idle control?? (what I had originally thought it did - otherwise it'd idle like crap ...

[BMsport.com]

The map sensor and airtemp sensor are there in place of the MAF meter. I tried looking for a BMW tech module on it, but they only have an explanation on the MAF not the MAP.

[NZ_M3]

Originally Posted by BMsport.com

The map sensor and airtemp sensor are there in place of the MAF meter. I tried looking for a BMW tech module on it, but they only have an explanation on the MAF not the MAP.

hmmm ... I've been told numerous times that the CSL is Alpha N mapping - the MAP sensor on the air line is only in relation to the idle control - maybe I'll unplug mine and see if it still drives

I am familiar with the MAP sensors on Hondas ... not so on BMWs seeing they are usually all MAF screens. However on Hondas, turning them into ITBs require a separate vacuum canistor (of a correct volume) to calculate for MAP reading (which the CSL does not have- if you still wanted to run the MAP sensor) - but a Honda on ITBs can be turned into full Alpha N mode (say via a Hondata S300) in which case you can do without the vacuum canistor and just run the MAP for idle purposes.

Maybe I am getting myself confused ...

[BMsport.com]

If you unplug the map sensor, the car will still run, like if it had a maf, it would still run unplugged. With the technical advances of the ECU they will run with so many things unplugged like the crank sensor etc.

[Highmast]

I did few weeks ago a mesure of the engine power on a power dynamic bench.
and the result was: 347 cv at wheels for 8000 tr/min with lid open but only 306 cv with it closed!
Lid didnt't open because of a defaillant sensor of the temperature gearbox. http://www.cslregister.com/forum/vie...918&highlight=
Maybe engine was also in security mode!

After repair the lid opened correctly to has today.
Doubtless the defect stayed in memory and affects has new the functioning.
I have to check connectors and return to bmw to make a control to erase défaults.

[NZ_M3]

Originally Posted by BMsport.com

If you unplug the map sensor, the car will still run, like if it had a maf, it would still run unplugged. With the technical advances of the ECU they will run with so many things unplugged like the crank sensor etc.

On a Honda it wouldn't ... hmmmm ... I am still not fully convinced that the car's fuel injection system is a MAP system rather than Alpha N - goes against the original marketing and subsequent informations I've seen and read for the car.

Any way, getting way off topic on this one.

Like I said before ... to be sure whether the flap actually does anything - a comparative dyno graph on one car with the flap operating and with the flap removed will put this myth to the grave.