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r34 stock boost gauge

charlieR34
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JimX Grand Master

JimX

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If it's the same as R32 and R33 (which I think it is) then it's measured in 100's of millimetres of mercury. That means when it's at +7, the manifold pressure is at 13.5psi or so. The needle goes above 7 though, so you could probably make a semi-educated guess at the pressure up to 15 or 16psi or thereabouts. If you don't have an EBC and want to set your bleed valve, then you should probably install a decent quality boost gauge. At least temporarily.

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ian Experienced

ian

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Nope, it isn't measured like that on the R34.

As you would have noticed (see picture attached) the top of the dial is 1kg/cm^2, and the bottom is -700mmHg.

1 bar is 1.02 kg/CM^2, so that means the top of the gauge at 1 kg/cm^2 is .98 bar or 14.223psi.

1 bar is also 750.2838 mmHg, so the bottom of the gauge (-700mmHg) is -.93 bar or -13.528psi

Hope that helps!

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ian Experienced

ian

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I agree, who knows what's in the heads of those marketing guys... And it’s even worse than that, in the optional (or later?) white background dials, they change it again to –1/+1 100Kpa, and, you guessed it, 100Kpa is 1 Bar ie 14.508psi…

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