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bar and psi what is the difference 

14 replies to this topic

#1 Pyscho Dat

  • Joined:31-March 03

Posted 03 April 2003 - 07:26 PM

im curious what is the difference between bar and psi?


and how do u calculate them?



#2 Ders

  • Joined:28-February 03
  • Location:Australia SA
  • Car:S15

Posted 03 April 2003 - 07:50 PM

1 bar is the pressure equivelent to the atmospheric pressure at the surface of the earth. So 2 bar is 2 times the atmospheric pressure. When talking boost levels, 1 bar boost is 1 bar above atmospheric pressure, se technichally, 2 bar above absolut zero pressure (which only exists in a vaccum)


1 bar = 14.69595 psi



#3 Pyscho Dat

  • Joined:31-March 03

Posted 03 April 2003 - 08:01 PM

thanks alot for that cheers Ders

#4 finch180

  • Joined:22-December 02
  • Location:Australia SA
  • Car:180SX / R33 / Starlet GT

Posted 04 April 2003 - 12:01 PM

yup nailed it... bar is used by the japanese and is a metric measurement of pressure related to atmospheric pressure like ders said atmos pressure is = to 1bar.


1 bar of boost is therefore 1 bar of pressure MORE than atmospheric pressure.


psi (pounds per square inch) is the imperial measurement for pressure



#5 sr20madness

  • Joined:12-November 02

Posted 04 April 2003 - 02:26 PM

One bar is 14psi. of boost. Most cars are running between 1/4 & 1/2bar.


So you do the math and you can use something that is different then the "norm."


If a person that doesn't know anything about cars but knows the word "boost" just tell him that you are running 1/2bar and that will get him thinking and wanting more knowledge to make his buddys fell bad.


Ha,ha,ha. Have fun tricking the s@#$ out of your buds.



#6 Ders

  • Joined:28-February 03
  • Location:Australia SA
  • Car:S15

Posted 04 April 2003 - 07:58 PM

Not having a go here, but 1 bar is closer to 15psi than 14psi... :)

#7 s13viper

  • Joined:25-December 02
  • Location:Australia QLD

Posted 04 April 2003 - 08:05 PM

hehe, u guys are allcorrect, but 1 bar of boost is commonly referred to as 14.7psi


 



#8 finch180

  • Joined:22-December 02
  • Location:Australia SA
  • Car:180SX / R33 / Starlet GT

Posted 05 April 2003 - 10:06 AM

lol yer ders posted it above!!!!


actually acording to my conversion program the terms "bar" and "atmospheric" pressure are slightly different...


1 bar = 0.9869233 atmospheric pressure....


1 atmospheric pressure = 14.69595 PSI  BUT!!!!!!!!!!!


1 bar = 14.50377 PSI... so there u go, i never actually realised that :)



#9 DannyG

  • Joined:11-December 02

Posted 05 April 2003 - 06:02 PM

Most people that say they are running 1 bar and are actually running 14psi I believe are actually using a guage in KG/cm3 - like most of the Jap ones - Trust etc


Dont quote me on the exact conversion but 1 kg = low 14's - 14.3 ?


 



#10 Ders

  • Joined:28-February 03
  • Location:Australia SA
  • Car:S15

Posted 06 April 2003 - 05:16 AM

Yep you're right, 1 kg per square cm boost = 14.22 psi

#11 LISTEN_180SX

  • Joined:11-January 03
  • Location:Australia NSW

Posted 06 April 2003 - 05:35 AM

but 1 bar is still 14.7psi...


 



#12 Muggs

  • Joined:25-July 03

Posted 26 July 2003 - 07:00 PM

1 bar is 14.7


 



#13 hypo180

  • Joined:06-November 02

Posted 26 July 2003 - 07:26 PM

i know this isn't absolutely precise, but it's still pretty damn close, but i always use my simple
conversion of 0.1 bar = 1.5 psi, i'm so used to it i can round off to exact psi boost level.

#14 driftr

  • Joined:27-May 03

Posted 26 July 2003 - 08:19 PM

and 101.4 kPA of air pressure for all those who know this too!

#15 dusky007

  • Joined:04-November 02
  • Location:Australia ACT
  • Car:'89 Convertible

Posted 26 July 2003 - 09:11 PM

Do a search, this has been VErY WELL covered before





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