Why does the Turbo Require a Load to create Boost?
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Why does the Turbo Require a Load to create Boost?
Why does the Turbo Require a Load to create Boost?
Example:
I can rev the bike to 7000rpm without a hint of boost when it is on a stand (motorcycle).
vs.
When riding at 7000rpm the boost is active.
Thanks!
Example:
I can rev the bike to 7000rpm without a hint of boost when it is on a stand (motorcycle).
vs.
When riding at 7000rpm the boost is active.
Thanks!
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The turbo doesn't require a load to make boost, it requires energy to make boost. That energy comes from exhaust flow and also from the expansion of the hot exhaust gases. When you free rev a motor, there is the same of gases flowing, but for a much shorter period of time. Plus, free reving a motor doesn't get the exhaust gases hot enough to expand enough to create further energy.
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also some cars have different set ups as far as vacuum, i know on hondas the BOV stays fluttering, unless under boost and helps drivability
so nuetral revs yields no boost
so nuetral revs yields no boost
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7k rpms at no load (i.e. sitting on the stand) = very little throttle input, there fore very little volume of air/gasses flowing through the engine, riding down the road, you open the throttle up alot more and for alot longer, therfore you have alot more air/gasses flowing this creating the said needed flow/heat energy to spool the turbo.
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under load, the air/fuel mixture is richer, therefore creating far more exhaust gas which is what turns the turbine, which is why you dont boost at idle or cruise...where the a/f ratio is like 17:1, under boost generally the a/f ratio is like 12.5-11:1
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Originally Posted by Josiah
under load, the air/fuel mixture is richer, therefore creating far more exhaust gas which is what turns the turbine, which is why you dont boost at idle or cruise...where the a/f ratio is like 17:1, under boost generally the a/f ratio is like 12.5-11:1
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Originally Posted by turbo-max
7k rpms at no load (i.e. sitting on the stand) = very little throttle input, there fore very little volume of air/gasses flowing through the engine, riding down the road, you open the throttle up alot more and for alot longer, therfore you have alot more air/gasses flowing this creating the said needed flow/heat energy to spool the turbo.
Load or resistance requires energy to be moved. Its a lot easier to push a ball than it is to push a cube. When the pistons are turning the crank, that is turning the transmission, that is turning the wheel, and moving hundreds of pounds of mass into wind resistance and possible gradients, it requires a considerable amount of energy compared to merely spinning the engine's rotating assembly.
Where does this energy come from? Mostly oxygen, and a little bit of fuel. When this additional oxygen is heated, it expands, like all gases do, and you build pressure between the cylinder and the turbo. The pressure goes the path of least resistance, spins the turbine thus spinning the compressor, and you have boost.
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