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Boost readings

228 Views 1 Reply 2 Participants Last post by  Steve Wood
It could be me being me -overthinking- but I read that the boost guage reads the maifold pressure, not the turbo outlet pressure, and if that's so, assuming that a stock 86 GN runs at 12#, wouldn't the boost gauge read 8#(approx., due to intercooler loss) or, does it run at 12# at the manifold, or does our boost gauge actually read the turbo outlet pressure? I am asking this becasue I believe I have a Red Armstrong 93 octane chip(another post), which runs at 17#(stated), but my boost gauge only reads 11 or 12#s. Or, is it that my boost regulator(the stock, non ajustable one right now until I have time to get adjustable one mounted) has fizzled out?
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The boost gauge normally reads pressure within the plenum. Therefore if you are reading 12# of boost on the gauge and installed a second gauge at the turbo outlet, before the ic, you would probably read closer to 16# on a stock ic.

If you add a low restriction aftermarket IC, then you might read 13.5# at the turbo outlet with 12# in the plenum.

Now, because the turbo only had to make 13.5 at the ic inlet to get 12# in the plenum, the intake charge temperature would be somewhat cooler and you would make more power, potentially, even tho the plenum pressure was the same.

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