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Hello this might not do jack bit its giving me the SH%Ts lol my boost gauge both factory and aftermarket don’t sit on -20 (vacuum) and -7 where they sat when I first got it, they now sit on -15 and -5 or near abouts, just wondering if I have a leak or something where should I start looking to find out this problem the mods I have on are.

Blitz Bov (note does it with the Stock BOV as well)

Boost Controller Manual (Does it without this on as well)

That’s pretty much it

Thanks

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Where does the aftermarket boost guage take its reading from?

If the stock gauge is reading different the first place to check is the vacuum hose that runs to the map sensor.

Its very common for the hose running to the map sensor to split.

Mine and many others have had the hose split where it connects to the map sensors nipple.

The map sensor will be located on the drivers side to the left of the brake booster.

The vacuum is within the plenum, so check all hoses running to it, inlet manifold gasket, plenum gasket, t/b gasket etc.

Ignore the bov and inlet piping as that won't alter the vacuum gauge reading

  • 7 years later...

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