Boost problems: details inside. (long)
01-01-2004, 12:53 PM
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Boost problems: details inside. (long)
For the past 2-3 months when I would accelerate under WOT my car would be limited to about 10psi. If I let off the throttle and and went back to WOT it would be fine and hold steady at about 17-18psi. This would happen maybe 1 time every 2-3 weeks. The first time this happened was at the drag strip and I heard a "pop" and the boost went to 10psi. Since then I haven't heard any noises what so ever. Last week I had some RS4 IC's installed and the car was working great. I just came back from a 1300 mile trip and along the way I noticed that the car felt like it was down on some power. As the trip progressed I felt more and more surging from my car. I was able to pinpoint it so it would happen in 6th gear with about 20-30% throttle. The needle on my boost gauge would jump from 2-5psi constantly going back and forth. It only would happen with the 20-30% gas. To prove that my car was down on power, I came across a guy in a newer SLK320 who was wanting to run. From 80-120 downshifting into 4th gear I was barely able to walk him. It could be the extra passengers and 300lbs of crap in the trunk, but I doubt it. I did a pressure test and did not find any leaks and all of the hoses to/from the IC's are tight. Any ideas on what it might be. I am APR stage 3. Thanks
01-01-2004, 01:01 PM
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Hmmm. I assume you have checked yout TBB and hoses
for a boost leak? It is a bit strange that the car would request so little boost (10psi) at WOT unless it was so cold that you were getting the required air density?! Usually when the car limits boost it happens in the "safe(limp) mode" and it is 5psi.
That "POP" sound you heard may be an indication of a hose braking/tearing and creating a boost leak.
That "POP" sound you heard may be an indication of a hose braking/tearing and creating a boost leak.
01-01-2004, 01:06 PM
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Yes I checked all of the hoses and I have a Bi-pipe. When the car was apart I checked
all of the other hoses etc. I was unsure why it would happen only every once in a while and now why the boost is fluctuating from 2-5 psi.
