Hi guys.
I thought I might ask about this here, since I've seen many of you owning a B5 S4 or RS4. So one of my best mates has a chipped S4 and it has come to that we swapped cars for the moment for various reasons.
Anyway, he's fighting a lingering boost issue on his car and we've been going at it for more than a month. Before that it was all ok. We went over all vacuum related things on this car (Bypasses, N75, boost hoses, vacuum hoses, even did a pressure test and nothing boost leak related), and it yielded no results. The only thing left now we have are the turbo wastegates. We have a feeling that they are sticking randomly for some reason. I was driving it back home today and filmed what the boost gauge is telling me.
https://www.youtube.com/watch?v=RONjw2iGSjw
So basically, when it goes, it goes like stink. Literally, I've had my feet cold when I floored this thing after my stock UrS4. The problem is, it doesn't go all the time. As you can see on the video, in the beginning, when I'm flooring it, it is very hesitant to build boost and the gauge needle is fluctuating like crazy. Just before it jumps on building boost it jolts and starts to stutter a bit everytime the needle fluctuates, but it doesn't feel like a misfire, besides misfires usually occur everytime you go for boost, had enough experience with that on mine. At the end of the video you can see that it goes like it should. Boost gets built smoothly and fairly fast.
Other problem is that the car needs a remap. It was chipped for stock turbos, but those died some time ago. Turbo shop guys decided to build something beefier, so at times he gets a Boost Pressure Exceeded code, because these fans are a bit more capable. But I guess that wouldn't explain the sporadic hesitation and fluctuation.
Would really appreciate some advice, as we've been going at it for quite some time. Should we pull the engine to check the wastegates?
I thought I might ask about this here, since I've seen many of you owning a B5 S4 or RS4. So one of my best mates has a chipped S4 and it has come to that we swapped cars for the moment for various reasons.
Anyway, he's fighting a lingering boost issue on his car and we've been going at it for more than a month. Before that it was all ok. We went over all vacuum related things on this car (Bypasses, N75, boost hoses, vacuum hoses, even did a pressure test and nothing boost leak related), and it yielded no results. The only thing left now we have are the turbo wastegates. We have a feeling that they are sticking randomly for some reason. I was driving it back home today and filmed what the boost gauge is telling me.
https://www.youtube.com/watch?v=RONjw2iGSjw
So basically, when it goes, it goes like stink. Literally, I've had my feet cold when I floored this thing after my stock UrS4. The problem is, it doesn't go all the time. As you can see on the video, in the beginning, when I'm flooring it, it is very hesitant to build boost and the gauge needle is fluctuating like crazy. Just before it jumps on building boost it jolts and starts to stutter a bit everytime the needle fluctuates, but it doesn't feel like a misfire, besides misfires usually occur everytime you go for boost, had enough experience with that on mine. At the end of the video you can see that it goes like it should. Boost gets built smoothly and fairly fast.
Other problem is that the car needs a remap. It was chipped for stock turbos, but those died some time ago. Turbo shop guys decided to build something beefier, so at times he gets a Boost Pressure Exceeded code, because these fans are a bit more capable. But I guess that wouldn't explain the sporadic hesitation and fluctuation.
Would really appreciate some advice, as we've been going at it for quite some time. Should we pull the engine to check the wastegates?
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