335i wastegate actuators and cold engine idling

e.n335 · 12-24-2007, 07:31 AM

It's winter here, outside temps are around 25 deg. F. Today, after starting the cold engine I had a look into the engine bay and saw the wastegate actuators working / regulating all the time during engine idling. The permanent wastegate adjustments went away after driving the car when the engine got normal operating temperatures. I use the PROcede v2.0.2 12-19 with the corresponding latest firmware.

Anybody knows if this is normal and why the wastegates have to be adjusted permanently on a cold turbo engine ? Or is it a problem my car could have which should be analyzed and solved ?

Thank you for your help and merry Christmas to everybody !

Eugen.

Serjames · 12-24-2007, 09:07 AM

perhaps the system calibrates itself ? self diagnosis kind of thing ?

SJ

e.n335 · 12-24-2007, 09:17 AM

It did not look like calibrating. I will try to reproduce this tomorrow again and test if it stops when I slightly increase the engine revs. I got aware about it by hearing the adjustments / wastegate actuator movements. It watched to it 3-4 minutes, then I drove the car. Engine idling itself is normal and smooth.

cn555ic · 12-24-2007, 11:06 AM

So is reving the engine a little higher than normal make this go away

Evo8MRto335I · 12-24-2007, 11:12 AM

The waste gate actuators should typically engage directly on boost. I haven't seen the stock turbos in person but It could be that they could be engage electronically by using a remote boost sensor.

my .2c

O-cha · 12-24-2007, 11:14 AM

It's just part of the cold start procedure, there's a ton of things the ECU does during a cold start to get the engine and exhaust warmed up as quickly as possible.

seven_227 · 12-24-2007, 11:22 AM

When I drive of with my car there is a weird compression sound coming from the engine bay on acceleration, until it got to normal temps, it only began in winter too, could that be the same thing you've discovered?

supertech335 · 12-24-2007, 04:50 PM

i believe this is normal operation to help get warmer air (air that got heated by the turbo) onto the cats for faster warm up of the cats.

O-cha · 12-24-2007, 04:53 PM

Quote:

Originally Posted by supertech335

i believe this is normal operation to help get warmer air (air that got heated by the turbo) onto the cats for faster warm up of the cats.

Yes because the wastegates pump warm heated air from the turbos onto the cats.

12-24-2007, 07:31 AM	#1
e.n335 Moderator 288 Rep 4,481 Posts Drives: e93 ///M3 DCT, 07/2009 Join Date: Feb 2007 Location: Switzerland, ZH iTrader: (0)	335i wastegate actuators and cold engine idling It's winter here, outside temps are around 25 deg. F. Today, after starting the cold engine I had a look into the engine bay and saw the wastegate actuators working / regulating all the time during engine idling. The permanent wastegate adjustments went away after driving the car when the engine got normal operating temperatures. I use the PROcede v2.0.2 12-19 with the corresponding latest firmware. Anybody knows if this is normal and why the wastegates have to be adjusted permanently on a cold turbo engine ? Or is it a problem my car could have which should be analyzed and solved ? Thank you for your help and merry Christmas to everybody ! Eugen. Last edited by e.n335; 12-24-2007 at 07:57 AM..
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12-24-2007, 09:07 AM	#2
Serjames Colonel 132 Rep 2,426 Posts Drives: E93 335i M-sport Join Date: May 2007 Location: Surrey - UK iTrader: (0) Garage List 2007 E93 335i M Spo ... [0.00] 2003 Nissan Primera S [0.00]	perhaps the system calibrates itself ? self diagnosis kind of thing ? SJ __________________
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12-24-2007, 09:17 AM	#3
e.n335 Moderator 288 Rep 4,481 Posts Drives: e93 ///M3 DCT, 07/2009 Join Date: Feb 2007 Location: Switzerland, ZH iTrader: (0)	It did not look like calibrating. I will try to reproduce this tomorrow again and test if it stops when I slightly increase the engine revs. I got aware about it by hearing the adjustments / wastegate actuator movements. It watched to it 3-4 minutes, then I drove the car. Engine idling itself is normal and smooth. Last edited by e.n335; 12-24-2007 at 09:32 AM..
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12-24-2007, 11:06 AM	#4
cn555ic 482 Rep 18,331 Posts Drives: 335i Join Date: Jun 2007 Location: US iTrader: (6)	So is reving the engine a little higher than normal make this go away
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12-24-2007, 11:12 AM	#5
Evo8MRto335I Captain 42 Rep 983 Posts Drives: can't list them all Join Date: Feb 2007 Location: Tucson iTrader: (1)	The waste gate actuators should typically engage directly on boost. I haven't seen the stock turbos in person but It could be that they could be engage electronically by using a remote boost sensor. my .2c
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12-24-2007, 11:14 AM	#6
O-cha Brigadier General 238 Rep 4,726 Posts Drives: Mcoupe Join Date: Oct 2007 Location: In front of you iTrader: (2)	It's just part of the cold start procedure, there's a ton of things the ECU does during a cold start to get the engine and exhaust warmed up as quickly as possible. __________________
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12-24-2007, 11:22 AM	#7
seven_227 Lieutenant 66 Rep 590 Posts Drives: AW e92 335i Join Date: May 2007 Location: Dubai iTrader: (0)	When I drive of with my car there is a weird compression sound coming from the engine bay on acceleration, until it got to normal temps, it only began in winter too, could that be the same thing you've discovered? __________________
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12-24-2007, 04:50 PM	#8
supertech335 Private First Class 3 Rep 126 Posts Drives: 335 6mt Join Date: Oct 2007 Location: south florida iTrader: (0)	i believe this is normal operation to help get warmer air (air that got heated by the turbo) onto the cats for faster warm up of the cats.
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