Conversion factors dealing with boost

98mpreziveRS · 01-31-2001, 08:12 PM

Yes i have searched all the forums..and this being power train..well seems like the BEST forum..not one matches this question perfectly.

*shrug*

here goes..

So..if KG/CM^3 if .7 KG/CM cubed equals 10 psi..then in theory...1.41KG/cm3 is equal to 20psi..right?

SO.. in theory 1 bar equals 14.503773773 psi...which is also equal to around 750.061682703 mmHG..correct? which means that 29.53 inHG = 1 bar..correct?

ALl this is really just checking to see if i am doing my conversions with the right numbers.

Also..for a sti v5 motor what is the stock boost pressure..and what is the most pressure the stock turbo can take..conditions being ideal and tuning be 100%

thanks

Aspen · 01-31-2001, 08:16 PM

Gary,

Already doing the math and you had that gauge in possesion for how long? A couple hours max?

Your conversion seems pretty close to me.

As for the limits of the stock STI turbo, I remember reading in some japanese magazine that it was around 350hp max. I'm not sure if that was on a stock set-up or not(no ported heads, fuel system, ecu, etc.)

Rob K · 01-31-2001, 09:10 PM

1bar=29.92inHG=14.7psi

LUME · 02-01-2001, 05:01 AM

actually, 1 bar = 14.5 psi, not 14.7

-RD

8Complex · 02-01-2001, 07:18 AM

I thought that 1 bar = atmosphere pressure at sea level, which was supposed to be 14.7psi. I'll look it up at work...

edekker · 02-01-2001, 08:50 AM

There's a misconception that the unit 'Bar' had been derived from (or interpreted to mean) 1 atmosphere of pressure. It's more of a coincidence that 1 Bar = 1 atmosphere (slightly less that 1 atm actually).

The unit 'Bar' is actually based on the MKS (Meter-Kilogram-Second) system of metric measurements. The root units from which 'Bar' is derived, is the gram and centimeter.

Since the unit 'gram' was chosen to represent the mass of a cc of water (under a set of strict conditions), there is no absolute mechanism which characterizes (defines) the relationship of 'Bar' to atmospheric pressure.

Ed.

98mpreziveRS · 02-02-2001, 12:45 AM

so umm...were my original conversions right?

lol..i did the math using all sorts of calculations and fulled up 2 full pages of paper with numbers everywhere... (i couldn't find a freaking calculator...and don't really trust the computer

)

so 14.503773773 psi does indeed equal 1 bar..right?

this is how i based my equations when i did some further factoring and such.

Bob O · 02-01-2001, 01:38 PM

98 I sent a conversion program to your email
bob

98mpreziveRS · 02-01-2001, 01:40 PM

thank ya..seems MUCH easier than doing it the good ol bust out the paper and remember as close as you can get it.

(finally..all them math and science classes have payed off

)

01-31-2001, 08:12 PM	#1
98mpreziveRS Scooby Specialist Member#: 972 Join Date: Feb 2000	Conversion factors dealing with boost Yes i have searched all the forums..and this being power train..well seems like the BEST forum..not one matches this question perfectly. shrug here goes.. So..if KG/CM^3 if .7 KG/CM cubed equals 10 psi..then in theory...1.41KG/cm3 is equal to 20psi..right? SO.. in theory 1 bar equals 14.503773773 psi...which is also equal to around 750.061682703 mmHG..correct? which means that 29.53 inHG = 1 bar..correct? ALl this is really just checking to see if i am doing my conversions with the right numbers. Also..for a sti v5 motor what is the stock boost pressure..and what is the most pressure the stock turbo can take..conditions being ideal and tuning be 100% thanks

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01-31-2001, 08:16 PM	#2
Aspen Scooby Specialist Member#: 145 Join Date: Aug 1999 Chapter/Region: MWSOC Location: The Windy City Vehicle: Banned to Housework for Summer	Gary, Already doing the math and you had that gauge in possesion for how long? A couple hours max? Your conversion seems pretty close to me. As for the limits of the stock STI turbo, I remember reading in some japanese magazine that it was around 350hp max. I'm not sure if that was on a stock set-up or not(no ported heads, fuel system, ecu, etc.)

01-31-2001, 09:10 PM	#3
Rob K Scooby Newbie Member#: 2777 Join Date: Oct 2000 Location: Montreal, Quebec	1bar=29.92inHG=14.7psi

02-01-2001, 05:01 AM	#4
LUME Banned Member#: 2641 Join Date: Oct 2000 Location: Bethlehem, PA Vehicle: 2000 Impreza 2.5 RS Dirt and Bird Poop	actually, 1 bar = 14.5 psi, not 14.7 -RD

02-01-2001, 07:18 AM	#5
8Complex Moderator Member#: 922 Join Date: Feb 2000 Chapter/Region: MWSOC Location: Schaumburg, IL Vehicle: 04 FXT Red	I thought that 1 bar = atmosphere pressure at sea level, which was supposed to be 14.7psi. I'll look it up at work...

02-01-2001, 08:50 AM	#6
edekker Scooby Newbie Member#: 143 Join Date: Aug 1999 Location: Kanata, ON, Canada Vehicle: 1999 Impreza 2.5RS Supercharged - and STOLEN	There's a misconception that the unit 'Bar' had been derived from (or interpreted to mean) 1 atmosphere of pressure. It's more of a coincidence that 1 Bar = 1 atmosphere (slightly less that 1 atm actually). The unit 'Bar' is actually based on the MKS (Meter-Kilogram-Second) system of metric measurements. The root units from which 'Bar' is derived, is the gram and centimeter. Since the unit 'gram' was chosen to represent the mass of a cc of water (under a set of strict conditions), there is no absolute mechanism which characterizes (defines) the relationship of 'Bar' to atmospheric pressure. Ed.

02-02-2001, 12:45 AM	#7
98mpreziveRS Scooby Specialist Member#: 972 Join Date: Feb 2000	so umm...were my original conversions right? lol..i did the math using all sorts of calculations and fulled up 2 full pages of paper with numbers everywhere... (i couldn't find a freaking calculator...and don't really trust the computer ) so 14.503773773 psi does indeed equal 1 bar..right? this is how i based my equations when i did some further factoring and such.

02-01-2001, 01:38 PM	#8
Bob O Scooby Specialist Member#: 1502 Join Date: May 2000 Chapter/Region: MAIC Location: Felton, PA, USA Vehicle: 2000 2.5RS & SV1kS BRP	98 I sent a conversion program to your email bob

02-01-2001, 01:40 PM	#9
98mpreziveRS Scooby Specialist Member#: 972 Join Date: Feb 2000	thank ya..seems MUCH easier than doing it the good ol bust out the paper and remember as close as you can get it. (finally..all them math and science classes have payed off )