boost vs. c/r ?

[texas-buzzard]

Here is a newby question. What is the difference of running a lower boost pressure on a high C/R engine vs. higher boost on a lower C/R? would you achieve technically the same results?
Thanks

Monte   

[Coryonbusa]

It's all about the volume of air/fuel in the cylinder.
The more air/fuel you can shove in there, the more power you're going to make.

[texas-buzzard]

It's all about the volume of air/fuel in the cylinder.
The more air/fuel you can shove in there, the more power you're going to make

Thanks, that makes sense.

Monte

[slammed1000]

 4lbs of boost is equal to 1 point of compression. 1lb. of boost is equal to 7% more power. for most people the concern is fuel octane and by keeping the compression lower they can run cheaper fuel. adding more boost makes alot more power compared to adding compression. the extra compression helps power/ torque down low but most turbos start spooling around 4k on bike applications. heat also plays a big factor in street driven aplications when adding compression.

[sportbikeryder]

4lbs of boost is equal to 1 point of compression. 1lb. of boost is equal to 7% more power.

Huh? I'll buy the ~7% per pound of boost on a stock head adn displacement. What does the 4 lbs boost = 1 point compression statement mean? Are you saying one "point" in compression equals 28 hp? Or are you saying that for every "point" of compression dropped you can run 4 more psi?

John

[OzBooster]

Couple of charts i saved from somewhere,only use as a guide as each system will be different

[slammed1000]

Huh? I'll buy the ~7% per pound of boost on a stock head adn displacement. What does the 4 lbs boost = 1 point compression statement mean? Are you saying one "point" in compression equals 28 hp? Or are you saying that for every "point" of compression dropped you can run 4 more psi?

John

john, i was basically giving you some reference to base the 4lbs of boost equals another 1 point of static presure for fuel oct. the chart explains that as well as the octane needed posted above. if your motor was a 8-1 motor and you bosted it 12-13lbs your static ratio would be aprox. 11-1 and need 107 oct. fuel.sorry for not making it clear as i posted it from my pda...

[BLACK_DEATH]