Turbo surges could it be N249 valve?
03-18-2004, 03:19 AM
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Turbo surges could it be N249 valve?
I have an A6 2,7 BT and the dealer has now changed all the hardware to RS4 K04 turbochargers, IC,MAF Housing, MAF,630 cc/min fuel Injector with adapters, all tubing, inlet , downpipes and race cats. I have not programmed the ecu yet.
The problem is that the turbo pressure surges between 3500 rpm-4500rpm in 4th and 5th gear.
There is a whistling noise when the surges comes.
It ddsent seems to be the waste gate but on the other hand its not easy to localize from where the sonund comes from.
And I have searched this forum and I read that similar problem can occur if the N249 valve is malfunctioning. So I looked at the top of the engine and it looks like the dealer has mounted a turbo pressure meter/mesaure device on a tube that comes out from this N249 valve.
Can this be the problem?
Very happy for some advice.
The problem is that the turbo pressure surges between 3500 rpm-4500rpm in 4th and 5th gear.
There is a whistling noise when the surges comes.
It ddsent seems to be the waste gate but on the other hand its not easy to localize from where the sonund comes from.
And I have searched this forum and I read that similar problem can occur if the N249 valve is malfunctioning. So I looked at the top of the engine and it looks like the dealer has mounted a turbo pressure meter/mesaure device on a tube that comes out from this N249 valve.
Can this be the problem?
Very happy for some advice.
03-18-2004, 04:10 AM
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Can you post a picture of the pressue meter?
I don't think the N249 would cause surging. More likely its the N75.<ul><li><a href="https://forums.audiworld.com/s4/msgs/1581269.phtml">Previous posts.</a></li></ul>
03-18-2004, 04:38 AM
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Re: Can you post a picture of the pressue meter?
Do you meen a picture of the conection, where the small tube is connected? They have connected it in a 3way connection.
Is the N75 valv connected to the wastegate? It is difficult to explain in swedish what happens in the car and it is much more so in english.
The car seems to work normal and the engin goes like a clock as long as I dont give it full throttle. Then it gives a whissling sound and the turbo pressure starts to pulse between 0.5 to 0.7 bar.
Could it be that the MAF(from RS4) isnt compatible with my ECU and gives wrong values? If they do a test with the vag-com wouldnt that give faulty codes?
Do you think that it could be something else wrong in the hardware?
Is the N75 valv connected to the wastegate? It is difficult to explain in swedish what happens in the car and it is much more so in english.
The car seems to work normal and the engin goes like a clock as long as I dont give it full throttle. Then it gives a whissling sound and the turbo pressure starts to pulse between 0.5 to 0.7 bar.
Could it be that the MAF(from RS4) isnt compatible with my ECU and gives wrong values? If they do a test with the vag-com wouldnt that give faulty codes?
Do you think that it could be something else wrong in the hardware?