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Engine or Boost Issue after 1/4 mile runs

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Old Apr 23, 2007 | 06:29 PM
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Engine or Boost Issue after 1/4 mile runs

So yesterday I decided to finally take my car to the strip to see what my 1/4 mile time was. I ended up with a 13.5 trapping about 103 mph. In total, I managed to get 4 runs in and was pretty satisfied for a beginner.

On my way home, I was driving behind a slow Jetta so I decided to get in front of them and dropped from 4th to third and as soon as I got on the throttle, I felt the car hesitate at around 4-5000 RPM and the boost dip and then regain itself a second or so later....This happened again when I got on the throttle and seems to occur near 15 psi of boost but then increases all the way after that second lag. I am uploading a youtube video for everyone to watch but was wondering what this could be considered as.

I have searched the forum for the past few hours but I'm not seeing an exact match for the issue. It's definitley not the clutch, and I don't see this being a boost leak either. It's that small dip that occurs as opposed to a straight increase in power that worries me. Could the hard runs on my car have caused the plugs to do something like this? If anyone has any good suggestions I would really appreciate it. I will also link the video to me driving this evening for a good reference as well. Thanks.
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Old Apr 23, 2007 | 06:39 PM
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The video

Here is the URL to the YouTube video:

http://www.youtube.com/watch?v=HDj7q4nVoFM

Let me know what you guys think....Sorry for the crappy driving, it was a pain holding the camera and driving...but you will notice if you just listen to the car accelerate how it limpens for a second.
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Old Apr 23, 2007 | 06:43 PM
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why do u say it's defnitly not your clutch ?what were your 60 foot times?it looks like you clutch is messed up.or something in the tranny..
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Old Apr 23, 2007 | 06:48 PM
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The reason I say it is not my clutch is because I have watched numerous videos of what a slipping clutch looks like and mine is definitley not it. Also, the RPM's aren't jumping up, it dips down slightly then pulls back up. My 60 foot on my 13.5 was 1.98....Then I did a 13.8 with a 1.9 60 foot.
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Old Apr 23, 2007 | 06:51 PM
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then i dont know ...............good luck lat
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Old Apr 23, 2007 | 07:00 PM
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Well, if I don't get this figured out myself, I have yet another reason to go visit AMS again
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Old May 4, 2007 | 01:36 PM
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check waste gate. weak spring?
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