997 Turbo / GT2 2006–2012 Turbo discussion on the 997 model Porsche 911 Twin Turbo.
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Old May 3, 2013 | 06:38 AM
  #31  
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Originally Posted by Talisman013

Thanks, but isnt it 1.4 * 14.7 20.58psi?

EDIT: nevermind, checked, its 14.5037738

for a very long time I thought 1 bar was the same as atmospheric pressure (14.7)
I think you are getting lambda conversion confused with boost pressure. 14.7 is the stoichiometric conversion of lambda.

Take a look at the sticky I made on the top of this forum, "Tuning with Durametric."

https://www.6speedonline.com/forums/...ic-primer.html
 
Old May 3, 2013 | 07:28 AM
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Originally Posted by bbywu
I think you are getting lambda conversion confused with boost pressure. 14.7 is the stoichiometric conversion of lambda.

Take a look at the sticky I made on the top of this forum, "Tuning with Durametric."

https://www.6speedonline.com/forums/...ic-primer.html
I think the standard atmospheric pressure is 14.70(14.696) PSI at sea level, since the value is identical with Stoich and so close to 1 bar/14.50 psi it's confusing.
 
Old May 3, 2013 | 08:23 AM
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Could be. Usually, I take the measured atmospheric pressure at idle, and subtract that value from the measured pressure during the run. The difference is the additional pressure produced from the turbos.

Since weather, altitude changes the numbers somewhat, the idling pressure seems more accurate to me.
 
Old May 8, 2013 | 11:01 PM
  #34  
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I am VERY new to logging (just started to play with it...so excuse anything that sounds OFF) but
target .80 to .85 ?
Isn't that a bit on the ballzy - lean side ?

also looks like timing is having a hard time staying steady (or increasing or not falling off - ie - line 746 and on - could be knocking ? righ arond there the lambas are looking quite high too )
 
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