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Old 01-31-2001, 09:12 PM   #1
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Join Date: Feb 2000
Post 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.


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%

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Old 01-31-2001, 09:16 PM   #2
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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.)
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Old 01-31-2001, 10:10 PM   #3
Rob K
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Old 02-01-2001, 06:01 AM   #4
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actually, 1 bar = 14.5 psi, not 14.7

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Old 02-01-2001, 08:18 AM   #5

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I thought that 1 bar = atmosphere pressure at sea level, which was supposed to be 14.7psi. I'll look it up at work...
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Old 02-01-2001, 09:50 AM   #6
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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.

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Old 02-02-2001, 01:45 AM   #7
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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.
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Old 02-01-2001, 02:38 PM   #8
Bob O
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98 I sent a conversion program to your email
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Old 02-01-2001, 02:40 PM   #9
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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 )
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