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<blockquote data-quote="desertheat" data-source="post: 3351652" data-attributes="member: 557169">A turbo does not like backpressure after the turbine housing, any backpressure on the turbine wheel only slows it down &amp;amp; decreases spool rate //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif Backpressure after the turbine is an internet myth, now a NA motor can definitly show certain gains depending on the design from a certain amount of backpressure and by the amount of backpressure and exhaust flow you can actually vary the peak hp and tq points. Case in point, you added a very high flow exhaust and picked up hp but most likley lost bottom end of it was n/a. That is because overall flow increased in the system and the same reason actual boost changes when you free up flow or restrict flow.You can vary velocity / backpressure on the motor before the turbine housing with the manifold design such as log styles, ram horns, semi equal length, true equal length etc which can make a difference in spool rate and were the power is focused. Some have better top end, some better midrange. All depends on design.</blockquote>

[QUOTE="desertheat, post: 3351652, member: 557169"] A turbo does not like backpressure after the turbine housing, any backpressure on the turbine wheel only slows it down & decreases spool rate [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] Backpressure after the turbine is an internet myth, now a NA motor can definitly show certain gains depending on the design from a certain amount of backpressure and by the amount of backpressure and exhaust flow you can actually vary the peak hp and tq points. Case in point, you added a very high flow exhaust and picked up hp but most likley lost bottom end of it was n/a. That is because overall flow increased in the system and the same reason actual boost changes when you free up flow or restrict flow. You can vary velocity / backpressure on the motor before the turbine housing with the manifold design such as log styles, ram horns, semi equal length, true equal length etc which can make a difference in spool rate and were the power is focused. Some have better top end, some better midrange. All depends on design. [/QUOTE]

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