HP per LB of boost?

[rtviper]

I see a lot of formulas on this site to determine ET. MPH etc. Is their a rule of thumb for horsepower per pound of boost? If a car is capable of running low 10s on 20 lbs of boost can you make an assumption on what it will run on 25 lbs of boost or 30 lbs of boost? I know you can put in the mph and weight of a car and get approximate HP can you get close to hp or et by adding boost to a known ET and MPH?

 

[jshilli1]

There are so many variables involved that it doesn't really hold in a wide range. While it may be possible to map and increase at say, 8, 10, and 12 lbs of boost that is linear, the relationship does not hold over a wider range. At higher boost, the turbo heats up the air more so at a given point power output may drop off or stay the same with additional boost. And the amount of air the engine can flow mostly depends on cam, heads, intake, and exhaust- once you reach the max, turning up the boost creates more boost due to restriction, but doesn't flow (much) more air through the motor.

 

[rtviper]

That makes sense . You talk about cam.heads etc, but can you draw any conclusions of the motors potential by its performance at 20lbs. Obviously it has had major improvements to all of those variables to run a low 10 with 20 lbs boost. Using the formulas available, that car has about 640 hp at the wheels on 20 lbs boost. Knowing this are you saying a close guess to the cars potential at higher boost cannot really be made. Thanks