how do forced induction engines respond to changes
10-23-2008, 01:17 AM
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how do forced induction engines respond to changes What effect does does adding a more free flowing exhaust, or bigger cam on a supercharged engine have? It seems that it lowers boost pressure, (assuming everything else stays the same) but will increase horse power at the same time. So, my question is what effect does this have on engine temps and overall stress on the internals? Also, is it easier for a supercharger to add more pressure if the engine itself is more efficient or can a given supercharger only support a certain hp no matter what?
There are many good threads on SD( Speed Density ) tuning here in the FI section and in the PCM Tuning section. Just search for SD or Speed Density in either section.
10-23-2008, 11:16 AM
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The engine is a pump. If you install bigger headers, or freer flowing exhaust, you reduce the restriction on the outlet side of the pump. Would a supercharged NMRA Renegade Mustang run 1.75 primaries or 2.00 primaries? The latter if they can fit them.
The cam is more situational, depends on what you are changing. I found that some race setups were running 8 to 10 degrees of split (240/250 for example). But cam theory is way more complicated and folks don't always agree.
The cam is more situational, depends on what you are changing. I found that some race setups were running 8 to 10 degrees of split (240/250 for example). But cam theory is way more complicated and folks don't always agree.