I have the greddy Boost gauge, I just did some minor things to my 7 And I noticed that my boost has gone up.......It was at 0.5 bar before and now its raised up to two little dashes (0.7?!?) So what am I boosting ?!? Thanks for any replys.......

 

to get it multiply bar (.7) x 14.7psi (1bar) = 10.29PSI

 

0.5 is stock wastegate pressure .... if you were getting that you had a problem .... 0.7 is stock boost level which is correct.

 

This a common misconception. It is actually about 14.5 psi per bar. I will be happy to explain this in another post if you really want all the boring details. Anyway, here is a good unit conversion site:
http://www.webcom.com/legacysy/conve...convertIE.html

 

Thanks guys......

 

Actually.....if you want to get technical 1 bar is the equvilant of 14.7 psi.:p

 

No, 1 bar=14.5 PSI and 1 atm=14.7 PSI. Check out http://www.megaconverter.com/mega2/ .

 

DEAN, WITH THE MODS YOU HAVE YOU SHOULD BE PUSHING WAY MORE THAN ONLY .7 BAR.

I have the same things you have: intake, exhaust, downpipe, intercooler, and ecu, i'm doing .9 bar (about 13 psi)

Check your vacuum hoses to see if any are loose and check your turbos, if they are stock and have over 100000 miles they may be going out.

--Victor

 

Is this PSIA or PSIG - This needs to be factored especially if you live in Denver

 

OK, just for that you get the boring explanation:

The International Standard Atmosphere (ISA) for dry air at sea level is as follows:
Pressure = 29.92 " Hg = 14.7 PSI = 1013.25 millibars
Temperature = 15 C = 59 F
http://www.booty.demon.co.uk/metinfo/isa.htm

This is where the magic 14.7 PSI number comes from. The ambient pressure will vary with elevation, temperature, humidity, and with high and low pressure areas like you see on the news, but 14.7 PSI is the standard reference point.

A "bar" unit of pressure is not derived from ISA pressure, but rather derived from the quantity of 1,000,000 dynes per square centimeter in the CGS system. You may have noticed that ISA pressure is 1013.25 millibars. This equates to 1.01325 bars. If you compare 14.7 psi with 1.01325 bars, you will find a 14.5 : 1 ratio, which is therefore your conversion factor. This conversion factor is a constant.

Now somebody please tell this to Corky Bell so that he can fix the next edition of his otherwise excellent turbocharger book. Oh yeah, and please also let him know that the speed of sound is not a constant.

You can add the ambient pressure to the PSIG to calculate the PSIA. BTW, hPa means millibars.
http://weather.noaa.gov/weather/ccus.html

 

Badd *** dude.....thanks for the explination.

Dennis

 

You guys are all wrong....hehehee.. on the greddy gauge, the unit for pressure is kg/cm2. So 1 kg/cm2 = 14.22 psi. He was asking the wrong question at the very beginning, 1 bar does not equal to 1 kg/cm2.

Chuck

 

heres an easy to use conv site

 

I was thinking the same thing Chuck was, only I didnt know if the greddy gauge was indeed bar or kg/cm^2. Bar is usually found on german cars / gauges....right? Anyways, here's a chart i made to keep handy.

 

Damn, you beat me to it. I've never seen a guage that measures in bars, on kg/cm2

 

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Thanks for the chart FD RACER.....And my bad on the bar thing...SHeeesh.....you guys knew what I ment :p