Reading compressor maps
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TECH Resident
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Joined: May 2004
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From: Merrillville,In (chicago)
Reading compressor maps hey guys i think that i am reading this compressor maps correctly...so i will include some pictures of where i think a 346Ci LS1 will be at 12PSI and 6200rpm.
according to this link.http://forcedinductions.com/consumption346.htm
Now the question i have is what affect does being at a lower effeciency cause? is the lower effeciency related to a higher amount of heat created per pound of boost, and there for making less power?
Thanks
Louie
Also if i am reading these right a T70 should be able to pull of about 12pounds at that rpm and boost level right? although it will be somewhat inneffecient.
according to this link.http://forcedinductions.com/consumption346.htm
Now the question i have is what affect does being at a lower effeciency cause? is the lower effeciency related to a higher amount of heat created per pound of boost, and there for making less power?
Thanks
Louie
Also if i am reading these right a T70 should be able to pull of about 12pounds at that rpm and boost level right? although it will be somewhat inneffecient.
just because ur not in the sweet spot on a compressor map doesnt mean it wont make power....but the less efficient the setup is the more heat in the system and the harder it is to make power.
Notice how the 2 graphs are different in scale on the the vertical axis - the 1st starts at 1 and the 2nd starts at zero. Your points seem correct, but if you were to draw in a boost line you would always draw it down and left towards the 1 on the left axis, because 1 is no boost, ambient pressure.
Yes, lower efficiency means more heat production per pound of boost. A properly sized intercooler with good airflow will take care of stripping a large percentage of heat out of the incoming charge.
Ideally you want to stay in the most efficient zone as high a percentage of boost time as possible. The 1st map is missing the zone efficiency numbers - it only shows max efficiency for the turbo, so it's hard to draw good conclusions. The T76 looks like your boost line would be generally in the 75% zone.
Jim
Yes, lower efficiency means more heat production per pound of boost. A properly sized intercooler with good airflow will take care of stripping a large percentage of heat out of the incoming charge.
Ideally you want to stay in the most efficient zone as high a percentage of boost time as possible. The 1st map is missing the zone efficiency numbers - it only shows max efficiency for the turbo, so it's hard to draw good conclusions. The T76 looks like your boost line would be generally in the 75% zone.
Jim
