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Coastiedan 03-10-2010 08:05 PM

Wierd boost reading
I have an 04 wrx, with few mods. I have the stock boost gauge, and at idle it reads -.06 MPa. As i accelerate, it will go up towards the positve section. Do i have a boost leak? or is a bad seal? Was tring to find this from anyone else, but no luck so far. Any answers would be great. Thanks.

jdowrx 03-10-2010 09:30 PM

Thats exactly what it's suppose to do. Is this your first turbo car?

RcrsWetDream 03-10-2010 10:07 PM

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I know it's mean but I kinda chuckled when I read the post... It's ok I was there not too long ago.

To further his answer, you sit in vacuum (inmg/mpa), and then start making boost (psi/bar) as you get on the gas. You'll sit at vacuum when cruising and at idle, and the only time you'll really go to positive boosting is when you're accelerating.

Coastiedan 03-11-2010 02:31 PM

Yea its my first, but ive had it for 4 years. Before it would be around zero at idle. Now it in the negative for the past year.

RcrsWetDream 03-11-2010 02:52 PM

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In that case your car has fixed itself... Weird that it used to do that. Have you recently had some work done that could have fixed a vacuum leak?

newtothegame 03-11-2010 05:53 PM

Like stated above, you car was apparently reading/running wrong for the previous 4 years. At idle it should read in the negative range of any boost gauge. Upon acceleration it will "build" boost and cross from vacuum (negative) to boost (positive pressure).

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