I ordered a GReddy boost gauge that reads in bar and was wondering the exact conversion to psi. Thanks alot.

 

Actually, if you look carefully, it says "kg/cm&#178".

1 kg/cm&#178 = 14.2psi.
This is off a little versus 1 bar.&nbsp 1 bar = 14.5psi.




-Ted

 

They are wrong.
1 bar = 14.5psi

http://www.chromatography.co.uk/TECH...r/Pressure.htm
http://users.aol.com/tspquinn/units.html
http://www.igus.com/conv.htm

This is just a short list of sites on Yahoo seaching for keywords "bar psi conversion".

1 atmosphere (atm) = 14.7psi.



-Ted

 

5 = 1.0 psi
10 = 1.9 psi
15 = 2.9 psi
20 = 3.9 psi
25 = 4.8 psi
30 = 5.8 psi
35 = 6.8 psi
40 = 7.7 psi That's gauge reading to psi or millimeters of mercury to psi. Or hash marks to psi, or.....

 

Yes, they are wrong. The confusion is caused by people thinking that a "bar" is equal to the ISA (International Standard Atmosphere) of 14.7 PSI at sea level. A bar is actually one million dynes per cm2, and has nothing to do with standard atmosphere. Corky Bell also makes this mistake in both of his books, so that adds to the confusion.

 

Ok so 1 bar equals 14.5 psi, correct everyone?

 

That's it!



-Ted

 

Thanks alot. Why do aftermarket gauges go by bar most of the time anyways?

 

The pressure units are somewhat arbitrary in terms of which one you use and get used to. I am sure that people that are more used to other units have the same impression about U.S. gauges that read in psi (that psi is a strange unit). People often buy gauges from other countries, so it is common to see units of bar or kg/cm^2.

-Max

 

Because just about every country other than the US uses the metric system. Most of the aftermarket gauges are made by Japanese and German businesses. Also, American sports cars tend to favor displacement over turbocharging, unlike most of the other countries.