Huge Boost Variations

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Apr 12, 2004 | 04:21 PM

00AUDITT

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Joined: Apr 2004

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Huge Boost Variations

So I have been blowing my brains out the last 3 weeks trying to figure out why (after installing my MBC) it cannot consistently boost pressure. Furthermore, why does it aggressively taper off and without moving the throttle (in a sense keeping my foot in the exact same position)? Why it not just tapers off aggressively but the boost actually tries to get back up to the level it spiked up to? Again, while maintaining the same throttle position. It's a weird sensation. Almost as if it is having a hard time breathing. FYI, it is not a leak. I have eliminated that scenario by hard-piping most of it and replacing the stock hoses with high temp hose rated at 400 psi and 300 degrees Celsius. What is my problem??? HELP. . . . . ..... . .Do you think it may be a fueling problem?

P.S. MBC= Manual Boost Controller

Apr 12, 2004 | 04:29 PM

TTschwing

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Joined: Dec 2000

Posts: 53,281

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First of all, Lose the MBC......>

If you've put one of those Boostvalves or Dawes devices in, that's your problem. Sounds like you've got it set too high causing the wastegate to stay shut, building up too much boost and sending you into limp mode. Put your N75 back in the system. Our cars don't like to run smoothly without them....K03's will overboost easily with no controls. The VW boys are always doing this and getting the same results..