TT (Mk1) Discussion Discussion forum for the Mk1 Audi TT Coupe & Roadster produced from 2000-2006

Odd problem with boost.

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Old Jul 23, 2007 | 08:57 AM
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Default Odd problem with boost.

If I'm on it just enough to hold around 5lbs, the car with kinda boost and back off rhythmically.

It's never done this before. It boosts and the goes out and boosts and goes out boosts and goes out...


really odd feeling, when I really get on it, it seems like there are little dips in the power on the way up to full boost.




Any ideas guys?!
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Old Jul 23, 2007 | 08:59 AM
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Default

Ya mean like it sorta pulses a bit?
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Old Jul 23, 2007 | 09:05 AM
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Default YES. perfect description

I couldn't think of a good word.
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Old Jul 23, 2007 | 09:06 AM
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Default Sounds like the n75 valve may be going >>>

Rhythmic boost surging is what happened when mine went.
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Old Jul 23, 2007 | 09:13 AM
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Default Very interesting >>

I only thought of that word because it happens to me too sometimes. Like when I'm going up a slight hill and step on the gas just a bit to keep the speed up. Boost seems to pulse anywhere between 3psi and 8psi. But when I stomp on it it doesn't do it...odd.
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Old Jul 23, 2007 | 09:13 AM
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Default Bummer.

The only thing that has changed is my intake and my diverter valve.


It may not matter but I have a boost machine. I backed off boost and the same thing happened.
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Old Jul 23, 2007 | 09:15 AM
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Default We are working with the same issue here...

Comforting. Maybe someone will know how to help us.

What mods do you have done?!

I pretty much have the GIAC91 program, the boost machine, and that new forge dv/bov other than those things I couldn't see any of my other mods making my car boost like this.
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Old Jul 23, 2007 | 09:16 AM
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Default Other than VAGing it >>

Is there any way to test the N75? Damn I gotta get VAGCOM!

btw Evan - the route you sent me for TT East looks pretty good! More than likely I'll be driving with you. At the very least I'll stay over at the same hotel/motel. I just registered...woohoo!!
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Old Jul 23, 2007 | 09:20 AM
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Default Pretty much the same mods too!

I have Giac, Forge DV-R, Schwing's Stage 3. Only other thing is an APR intake hose......but that shouldn't affect anything. And actually, I haven't really noticed if it's done it lately. I'll have to test it out again...
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Old Jul 23, 2007 | 09:35 AM
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Default >>>

There may be a way but I don't know what it is. I had a spare valve on hand when it happened to me.

When it happened to me, while accelerating boost would rise then fall around 5 psi then go back up then do the same a couple of times at about a 1-2 second cycle time, then sometimes it would be ok after that, other times it would keep surging.

There was a minor mistake on the route I sent you but it's nothing worth mentioning. The only thing that still needs to be worked out is a meeting place/time depending on who is going. I figure one of the rest areas on the nj turnpike at around 10am or so would work best.
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