does lid airbox stay closed with cold temperature?

[Highmast]

this morning i used my car with a heavy negative temperature (about -10°c)...
after oil and water engine at good level, i pushed the throttle more to ear the great carbone sound after 1 week park in my garage (12°C inside)...
But i realised that my carbon airbox refused to open the lid but nevertheless sport mode was on...

so, does electronic is sensible to cold temperature or it's a protection against frozen air and not open for not inhale directly?
Is somebody has meet this problèm before?

thanks for your experience

[_Nathan_]

Opens just fine, get someone to take a look while you rev it past 4k in sport mode. Might be stuck, common problem.

[RichW]

Mine was opening when stood still, but was intermittent whilst moving


Took the dam thing out! Cured!

[glendog74]

Remove flap - 5 minute job - problem gone! :-D

[Windowlicker]

I spoke to Thorney about their views on the whole flap removal thing, their opinion was , they wouldnt recommend it.
Basically, when running in normal mode, for the majority of the rev range the engine breathes through a much smaller inlet, and most work at part /light throttle/ low revs, with the flap removed, it would be running a bit rich as it compensates for the extra air it registers entering the engine.
Not a major problem as such, but having looked at the difference in the inlets behind the flap, (as in the bit used when the flap is closed, below 3,500 in sport and 6,000 in normal) there is a massive difference in potential airflow.
They said for the sake of £40 ish on a car of this value, why not just buy another flap actuator/solonoid, they run their cars with the flap in situ.

[SpineOnABap]

That's not right. Removing the flap doesn't mean the engine suddenly gets more air than it's expecting. The throttle opening controls how much air enters the engine. It's different if it's jammed shut so overall air flow is restricted, but being jammed open (or removed) makes sod all difference - with or without sport mode.
:beer:

[houlbt]

There was a similar thread on PureGT - See Here if you have Access

But SpineOnABap is correct it makes no difference. Don't know what Thorney is on about? :clown:

[Mark CSL]

The only thing i would say is if it works without it why did BMW Motrsport fit it :whistle:

[shimmy]

There was a similar thread on PureGT - See Here if you have Access

But SpineOnABap is correct it makes no difference. Don't know what Thorney is on about? :clown:

tom

that post still makes me laugh re BMS/Thorney

[houlbt]

The only thing i would say is if it works without it why did BMW Motrsport fit it :whistle:

Why do so many sports cars have exhaust valves these days?

[dave1]

noise regs

[SpineOnABap]

exactly

[Mark CSL]

The only thing i would say is if it works without it why did BMW Motrsport fit it :whistle:

Why do so many sports cars have exhaust valves these days?

I still think there is more to it than that.
But i do no mine stopped working and i put a new pontomoter on it
and all is good now.

[BMsport.com]

Finally, some one understands :wink: the flap is there for noise reasons. It has no bearing on the fuelling. The amount of air entering the engine is controlled by the throttle valves, not the flap and monitored by a MAP sensor. There are many CSLs out there with and without the flap. If it caused rich or weak running then the emission light would illuminate on the dash board. To say it must have a reason as it was fitted by BMW Motorsport is correct, noise. For the same reason the exhaust is quiet.

[M3_CSL]

probably someone should make an exhaust with a valve for the CSL too... while the exhaust valve is closed, the exhaust flow is like the original CSL exhaust... and when the sport button is depressed, both intake and exhaust valves will be opened for full race noise..

I used to use an electronic exhaust flap on my highly tuned N/A 350Z (revved to 8200rpm with full engine rebuilt and MoTeC), that car was quite loud with its exhaust, so a flap was needed to go around the suburban streets and i couldn't believe how much difference it made.... but with the flap closed, power loss was substantial and also the engine didn't like it at all

just a wild thought...

cheers,

richie