Hello S2 forum! This is my first ever post so bear with me. I recently picked up a '95 S6 for an absolute STEAL! To which I have been working out the odds and ends. I have finally got it to a point where I can really give it some beans and, unsurprisingly, I might have a boost leak. (maybe?)
So here is the low-down. When accelerating full throttle the car will build boost until 3K RPM at that point I'm at about 20-ish PSI. Past this point when looking at my boost gauge I can see the PSI dropping to about 17-18-19 PSI for roughly 1-1.5 second before returning to 20 PSI. In this short span of the boost falling off, the car will noticeably loose power. Once the boost goes back to 20 PSI it will pick back up and continue accelerating.
It does not sound like the car is misfiring or the engine is sputtering out. The only audible aspect is the sound of the turbo getting quieter when the boost falls to under 20 PSI sort of like a "WSHHHHH (20 PSI)" to "wshhhhh (under 20)" back to "WSHHHH" when I get back to 20 PSI. After the drop off in boost and subsequent return, the car will continue pulling at 20PSI until I let off the gas.
Going full throttle ABOVE 3000RPM lends itself to a similar problem, but instead of dropping from 20 PSI to 17-18-19 PSI it's more closer to 19 PSI and the car won't fall flat on its face as bad.
Also on some pulls the car will flutter on boost, the dial will sputter back and forth as boost increases, this can be heard as well.
As for the setup of the car itself. It's rocking a coil conversion, speed density tune, and that's it! Who the tune was done by I have no idea, and I do believe the turbo is stock as the routing of the lines seem stock to other K24 7000 AAN's I've seen
I plan on doing a boost leak test but where to start I am not sure. But any input will be greatly appreciated! I will try to post a video down below once I figure out how to do that
So here is the low-down. When accelerating full throttle the car will build boost until 3K RPM at that point I'm at about 20-ish PSI. Past this point when looking at my boost gauge I can see the PSI dropping to about 17-18-19 PSI for roughly 1-1.5 second before returning to 20 PSI. In this short span of the boost falling off, the car will noticeably loose power. Once the boost goes back to 20 PSI it will pick back up and continue accelerating.
It does not sound like the car is misfiring or the engine is sputtering out. The only audible aspect is the sound of the turbo getting quieter when the boost falls to under 20 PSI sort of like a "WSHHHHH (20 PSI)" to "wshhhhh (under 20)" back to "WSHHHH" when I get back to 20 PSI. After the drop off in boost and subsequent return, the car will continue pulling at 20PSI until I let off the gas.
Going full throttle ABOVE 3000RPM lends itself to a similar problem, but instead of dropping from 20 PSI to 17-18-19 PSI it's more closer to 19 PSI and the car won't fall flat on its face as bad.
Also on some pulls the car will flutter on boost, the dial will sputter back and forth as boost increases, this can be heard as well.
As for the setup of the car itself. It's rocking a coil conversion, speed density tune, and that's it! Who the tune was done by I have no idea, and I do believe the turbo is stock as the routing of the lines seem stock to other K24 7000 AAN's I've seen
I plan on doing a boost leak test but where to start I am not sure. But any input will be greatly appreciated! I will try to post a video down below once I figure out how to do that
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