Quote:
Originally Posted by Zeph
I am curious to this as well, why is 9psi "harder on the turbos" @ 6k RPM as opposed to 4K RPM? I mean unless they are just saying by the time you go from 3K to 6K you have been maxing the turbos for a few seconds already, thus building up too much heat? It almost seems like it would be easier to hit high boost at higher RPM's due to increased exhaust pressure/heat/speed? That plus wouldn't the engine be "wanting" more air at higher RPM?
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Yes...the engine wants more air at higher rpms.
The pistons are moving much faster and sucking in more air as a result.
Therefore, the turbos have to compress the air much faster just to keep the boost at a constant pressure.
Seems to me the only way they can do that is by spinning faster and faster as rpms climb.
Same boost = higher turbine speeds as rpms climb.
Pretty soon you max out the turbos ability to move air efficiently and they create friction which heats up the intake charge.......not to mention that shaft speeds go through the roof.