** Atmospheric pressure ratio.
08-06-2003, 09:03 PM
#1
0.5 BAR
Thread Starter
Join Date: Jul 2003
Posts: 78
** Atmospheric pressure ratio.
So the normal boost provided by a turbo is 6-8 pounds per square inch. If the AVERAGE atmospheric pressure is 14.5 (give or take .3), then why doesn't a 8 psi turbo double the amount of horses you have? Just curious.
08-06-2003, 09:09 PM
#2
1.5 BAR
Join Date: Dec 2002
Posts: 1,002
Re:** Atmospheric pressure ratio.
thats a hardcore math problem. all i know is that the general formula for a b16 is (hp) * (boost+14.7)/14.7
so 160*(8+14.7)/14.7= 247 hp
that sounds high but i read that somewhere... of course it all depends on your turbo too
so 160*(8+14.7)/14.7= 247 hp
that sounds high but i read that somewhere... of course it all depends on your turbo too
08-06-2003, 09:11 PM
#3
3.0 BAR
Join Date: Mar 2003
Posts: 21,479
Re:** Atmospheric pressure ratio.
I don't undersatnd why you would think 8 psi will double the horsepower? 8 psi means nothing. It's all about the cfm.
Also, the motor has many more factors than just boost pressure. The motor has to be able to take the air in, ignite the air/fuel, and get rid of the air. You can try to cram all the air you want into a motor, but if it can't ignite it and get rid of it in an efficient manner it won't produce worth a ----.
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Also, the motor has many more factors than just boost pressure. The motor has to be able to take the air in, ignite the air/fuel, and get rid of the air. You can try to cram all the air you want into a motor, but if it can't ignite it and get rid of it in an efficient manner it won't produce worth a ----.
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08-06-2003, 09:13 PM
#4
0.5 BAR
Thread Starter
Join Date: Jul 2003
Posts: 78
Re:** Atmospheric pressure ratio.
Hmm ... it seems as if you are too smart for your own good! :P I would assume that the exhaust flow being obstructed by the actual turbo would mean a prevention of equal ratio proportions. But hey, as you stated it ALL depends on your turbo.
08-06-2003, 09:21 PM
#7
3.0 BAR
Join Date: Mar 2003
Posts: 21,479
Re:** Atmospheric pressure ratio.
Haha, that makes more sense. My head hurts after trying to figure out why you would think 8 psi would "double" the horsepower.
The obstruction the turbo causes is the price you have to pay for the massive gain in horsepower and IMO it is minimal. I would gladly take a ~5 horsepower loss in the bottom end to gain ~60 at the top.
It's like taking an inch off one of your arms and adding it to the length of your *****. It's a pretty fair trade. 
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The obstruction the turbo causes is the price you have to pay for the massive gain in horsepower and IMO it is minimal. I would gladly take a ~5 horsepower loss in the bottom end to gain ~60 at the top.
It's like taking an inch off one of your arms and adding it to the length of your *****. It's a pretty fair trade. __________________
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