compression and boost

[pr0_re]

I always hear that a low compression and a higher boost level is better than lower boost and higher compression. Dose anyone know the theory behind this?

 

[Nomad666]

Originally posted by pr0_re
I always hear that a low compression and a higher boost level is better than lower boost and higher compression. Dose anyone know the theory behind this?

Low compression and high boost is easier to tune than higher compression and low boost.

 

[nine5raptor]

They are both essentially the same thing. The main difference is, the pressurized air from boost can be cooled with an intercooler, whereas the pressure from the static CR cannot.

 

[Defiant]

Higher compression will give you more motor when you're not into the turbo's efficiency range. If you think about it, one of the things a turbo is effectively doing is raising the compression ratio.

 

[a351must2]

Raising the static compression ratio only gives you a small increase in power by squishing the air/fuel mixture more...raising the boost gives you more power by putting more air/fuel in the cylinder to be squished.

Obviously having more air/fuel in the cylinder is going to give a greater power increase than just squishing it in the cylinders a little more.