Okay first i would like to say i am new at cars, so i am sorry if i am asking a stupid question. I am starting to get into automotive n stuff, And i been hearing words like PSI, and i dont know what that means. pushing 12 psi?? can someone educate me please ^_^

 

They are talking about how many psi there turbo is making. psi is a way of messureing air pressure, like in your tires. I belive it stands for pounds per square inch or something like that.

 

The atmosphere pushes air into an engine at a pressure of around 14-15psi. A turbo boosts that pressure by whatever amount of boost you hear people are running. So is someone is boosting 7psi, then there's around 21-22 psi pushing air into their engine.

 

so average cars push 14-15 psi. Turbo help u push more. So whats safe total PSI level should a car push without tuning?

 

psi in turbo sense is lbs per square inch correct...also measured in "bar" IE 1bar is 14 PSI=1 atmosphere of pressure...2bar 28 PSI etc...

other exaple..when scuba diving...im pretty sure 14 ft under water is 1 atmosphere...just talking about air pressure is all...

 

psi= how much boost your runnin

 

PSI = pounds/square inch
there are 2 types
PSIA = pounds/square inch atmosphere (atomospheric pressure)
PSIG = pounds/square inch gauge (14.7 + Xgauge press = Xatmospheric pressure)

1bar = 14.7psi

 

Oh geeezzz - where should I start??

psi stands for "Pounds per Square Inch".

Other units for pressure are bar, atmosphere, inches of water, mm of mercury, etc...

1 bar = 14.504 psi

1 "standard atmosphere" = 14.696 psi
(real atmospheric pressure changes with altitude & weather)

1 psi = 51.7 mm of mercury
1 atmosphere = 29.92 inches of mercury

1 psi = 27.68 inches of water
(real water depends on temperature & salinity)
So about 410" or 34 ft under water is about one extra atmosphere of pressure.
Maybe 30 or 31 feet for seawater?


Absolute & gauge are terms that you can use along with any of these units. So psia is psi-ABSOLUTE. Zero absolute is a perfect vacuum. No air whatsoever. That's the same if you say zero psi-absolute, or zero bar-absolute...

When somebody just says psi (or bar), usually that means psig or psi gauge, like SlicedBread says. That means you're measuring it relative to the surrounding air (whatever that is). So if you're at sea level in normal weather, 10 psig means 24.7 psia. But if you're in Denver, 10 psig means 22.2 psia.

Yeah, its friday & I'm bored.