So...I've been driving quite mildly for some time but last night I gave a ride to someone at the Friday Night GTG. I notice my boost, and it peaked at about 24-25 psi and then dropped to nearly 15 psi before beginning to climb again. Today, while at C&C, I was giving a ride to a club member to look at the boost situation. Boost went up to 24ish psi and dropped again...then another pull it peaked, dropped, and then bounced up and down. We both also heard the boost leak from the DV(AWE) while building boost during the second pull. This shouldn't happen as the AWE-DV spring is rated for 30+ psi. Later, I get home, pop the hood and give it a look over to see if I see anything obvious but do not, and grab my laptop and plug in Vag-Com and go do a couple data logs. I watch the boost gauge while doing so and it looks normal'ish again. Only, it doesn't peak as high and also drops to 17 psi and data confirmed a peak of 21.5 psi and drop to 17.5 psi. Normal has been peak=22.5 psi and drop to 18.5 psi...so it was close in the data. My wgdc went to 97.3% for a period of 400rpm (2400 to 2800 rpm) and then dropped until it reached mid 30% about 1k rpm later, at 3600 rpm...and climbed back to 52% by redline.
Seemingly normal, right? But leaves me wondering "WTF" was going on? I went looking at the engine bay again...checking many connections, tightening clamps, looking for oily residue at connections, and so forth but find nothing obvious. I may reverse my AWE DV so that the presence of boost will press the DV closed in order to eliminate the DV spring as the source of weirdness should the condition reappear.
Not sure yet if I should add or subtract WG preload just yet...or even if I should attempt installing the blue Forge WG spring but not confident this will fight the N75 and ECU as it may not want to open until 28 psi is reached. Right now there isn't much preload on the actuator. My forge WG actuator peaks boost at 20.5 psi with the yellow spring and zero preload. I have just 1.5mm(turns) of added preload right now. I also have a newish N75 with probably just 13k miles on it. The new N75 solved a very similar issue when I replaced it. Then, the symptoms were that my boost was just reaching 18 psi, dropping to below 10 psi quickly after hitting that 18 psi and then climbed back to about 15 psi.
The PCV is new and last revision available.
Anyway, if you feel like mulling this over...my plans are to do a pull from time to time and when the condition reappears I will reverse the AWE-DV. If this changes nothing...I will eliminate all preload to see if less boost solves it which may point to a leak I need to detect. If that changes nothing, I will add 2mm to 3mm of preload and see if more preload helps. :iono:
Vacuum line and boost plumbing tests are likely coming, but gonna get through those other steps mentioned first.
Seemingly normal, right? But leaves me wondering "WTF" was going on? I went looking at the engine bay again...checking many connections, tightening clamps, looking for oily residue at connections, and so forth but find nothing obvious. I may reverse my AWE DV so that the presence of boost will press the DV closed in order to eliminate the DV spring as the source of weirdness should the condition reappear.
Not sure yet if I should add or subtract WG preload just yet...or even if I should attempt installing the blue Forge WG spring but not confident this will fight the N75 and ECU as it may not want to open until 28 psi is reached. Right now there isn't much preload on the actuator. My forge WG actuator peaks boost at 20.5 psi with the yellow spring and zero preload. I have just 1.5mm(turns) of added preload right now. I also have a newish N75 with probably just 13k miles on it. The new N75 solved a very similar issue when I replaced it. Then, the symptoms were that my boost was just reaching 18 psi, dropping to below 10 psi quickly after hitting that 18 psi and then climbed back to about 15 psi.
The PCV is new and last revision available.
Anyway, if you feel like mulling this over...my plans are to do a pull from time to time and when the condition reappears I will reverse the AWE-DV. If this changes nothing...I will eliminate all preload to see if less boost solves it which may point to a leak I need to detect. If that changes nothing, I will add 2mm to 3mm of preload and see if more preload helps. :iono:
Vacuum line and boost plumbing tests are likely coming, but gonna get through those other steps mentioned first.