Theoretically speaking, can someone explain to me the difference between running low compression+high boost to achieve the same amount of power versus high compression+low boost?

I mean .. if in the end, either way you have the same amount of air and fuel comressed into the same amount of space, why is one any different or better than the other? I know that most stock turbo or supercharged cars tend to use low compression from the factory .. why do automakers do that?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DanM &raquo;</TD></TR><TR><TD CLASS="quote">Theoretically speaking, can someone explain to me the difference between running low compression+high boost to achieve the same amount of power versus high compression+low boost?

I mean .. if in the end, either way you have the same amount of air and fuel comressed into the same amount of space, why is one any different or better than the other? I know that most stock turbo or supercharged cars tend to use low compression from the factory .. why do automakers do that?</TD></TR></TABLE>

They do that because factory cars are made to run on pump gas.
There is less chances of detonating with low compression. Compression numbers from factory turbo cars (i.e. 8.0:1-to-9.0:1) are within the tuning window. Anything higher, will have to run with severely retarded ignition timing or high octane gas. economically inefficient

There is less potential for running high boost with high compression, but you can run less boost and produce power equal to a low comp motor with moderate boost (keep in mind there is a limit).
With high comp, you get better lowend pickup, turbo spools up quickly, but tuning will be "edgy", and you dont want that under the changing conditions. High comp = more chances to detonate.

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