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Series 2 Factory Boost Guage

lilcrash

By lilcrash,
in Four Door Family & Wagoneers

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lilcrash Veteran

lilcrash

Posted
Posted

hey eveyone. i have been doing some research since i bought my stag a few months ago and ive come to the conclussion that there is alot of wrong information. i would just like to point out the 1 major point that puts everyones information possibly wrong.

what ive found

1st bit of info - 700 millimeter of mercury [0 °C] = 13.535 744 51 pound/square inch (converion program)

2nd bit of info - top line of guage(+700mmHg) is 9psi (info found on here)

3rd bit of info - my guage reads the half way line at 8psi (testing with a boost guage in my car)

4th bit of info - with boost control unplugged reads 1/4 of guage at 5psi(testing with boost guage in my car)

so is the info found on here incorrect or are the other 3 incorrect?? is the factory boost guage wrong in my car??

im not trying to make anyone look silly, i would just like to know the truth. sorry if anyone is offended.

thank you, i look forward to the replies

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https://www.sau.com.au/forums/topic/233017-series-2-factory-boost-guage/
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lachlanw Veteran

lachlanw

Posted
Posted (edited)

check where the vacume line goes onto the factory boost gauge sensor . its quite random plastic and mine had split and the gauge was just generally up to f all . its on the same bracket that holds the throttle cable right where ti comes through the fire wall . the pipe is on the bottom . i now get full range of movement on factory gauge . nearly -700 and right through to +700 which is what my defi gaugeg says -600 to 0.7kgf/cm2 . +700 mmHg and 0.7kgf/cm2 both equal ten psi . well they did on the pressure converter i used .

Edited by lachlanw
simpletool Mentor

simpletool

Posted
Posted (edited)

700mmHg is NOT 9psi. It IS 13.5psi.

Your factory guage was likely not made to be super accurate or entirely linear in response.

The factory guage is a guide and should not be used to accurately monitor boost.

For instance my zero (atmosphere) is about 2mm below the zero on my guage, and it can vary a little in it's response day to day.

Edited by simpletool
lachlanw Veteran

lachlanw

Posted
Posted

ok my bad i swear it did last time i checked . meh good thing i have the defi gauge aswell . not that it really matters besause my car is only gonna have ten psi up it which it came from the factory with . mmHg is a vacume measurement anyway . stupid unit to measure pressure with . the r34 gtt factory gauge is in kpa .

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted
ok my bad i swear it did last time i checked . meh good thing i have the defi gauge aswell . not that it really matters besause my car is only gonna have ten psi up it which it came from the factory with . mmHg is a vacume measurement anyway . stupid unit to measure pressure with . the r34 gtt factory gauge is in kpa .

I think bar is the apprporiate measurement. I have just changed my psi boost gauge for one that reads in bar

100kpa=1 bar (=14.5psi)

and I plan to run my Series I at 0.8bar until I get a new turbo.

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