Turbo efficiency
09-07-2003, 12:35 PM
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Turbo efficiency
I am getting really frustrated. These people of at b15sentra.net are argueing with me that a turbo is less efficient then superchargers. Many of them think a turbo heats the air more then a supercharger because its next to the exhaust. Anyone wana help me out? I have told them the facts, and posted a quote from Mike Kojima (engineer, writes for scc and some other magazines). They still dont believe me. I guess what they say about argueing over the internet is true.... oh, here is the link: http://www.b15sentra.net/forums/show...5&pagenumber=1
09-07-2003, 07:18 PM
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Originally posted by thermalfi'd16
Boost is boost. Physics dictate that when air is compressed, it raises temperature.
Boost is boost. Physics dictate that when air is compressed, it raises temperature.
09-08-2003, 12:02 PM
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here ya go and i quote from Civic Duty by Alan Paradise ISBN 0837602157
:
"Unlike turbochargers, superchargers do not require the use of exhaust gases to drive them. A supercharger works off a belt, much like any other accessory connected to your engine. This is the main reson superchargers have a lower efficiency rating than turbochargers. However, it is also the reason the power is more responsive on the low end of the power band"
you win!
:
"Unlike turbochargers, superchargers do not require the use of exhaust gases to drive them. A supercharger works off a belt, much like any other accessory connected to your engine. This is the main reson superchargers have a lower efficiency rating than turbochargers. However, it is also the reason the power is more responsive on the low end of the power band"
you win!
09-09-2003, 06:57 AM
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Although turbochargers heat air slightly more than supercharges because of their proximity to the manifold and turbine, they are very similar in their heat transfer as a result of compression. Turbochargers take much less horsepower away from the motor to operate then superchargers. Although superchargers make boost at all RPMs, if you are smart and 1- flowmatch your turbo to your manifolds and ports and 2- select a turbo that makes boost at low rpm and is efficient at the boost you're looking to run. You are looking at a setup that is far more adjustable than a supercharger and will make more power in the long run. (You can only make a pulley so small, you can tune a wastegate all you want.)
09-09-2003, 10:23 AM
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Originally posted by MGBRaceman
Although turbochargers heat air slightly more than supercharges because of their proximity to the manifold and turbine, they are very similar in their heat transfer as a result of compression. Turbochargers take much less horsepower away from the motor to operate then superchargers. Although superchargers make boost at all RPMs, if you are smart and 1- flowmatch your turbo to your manifolds and ports and 2- select a turbo that makes boost at low rpm and is efficient at the boost you're looking to run. You are looking at a setup that is far more adjustable than a supercharger and will make more power in the long run. (You can only make a pulley so small, you can tune a wastegate all you want.)
Although turbochargers heat air slightly more than supercharges because of their proximity to the manifold and turbine, they are very similar in their heat transfer as a result of compression. Turbochargers take much less horsepower away from the motor to operate then superchargers. Although superchargers make boost at all RPMs, if you are smart and 1- flowmatch your turbo to your manifolds and ports and 2- select a turbo that makes boost at low rpm and is efficient at the boost you're looking to run. You are looking at a setup that is far more adjustable than a supercharger and will make more power in the long run. (You can only make a pulley so small, you can tune a wastegate all you want.)
