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Originally Posted by Turboshaft  well in theory the turbo lag is lower if the pressure difference between the pressure of the air going into the intake and the pressure of the compressed air (ie before and after the turbo) is smaller. So theoretically, in order to have 0 turbo lag you need higher pressure before the turbo and lower pressure after , but of course this is not practical.
This concept is similar to the thermal efficiency of an engine which is related to the temperature difference of the cold and hot sources (it's actually a ratio)
To reiterate, the higher the pressure after the turbo , the longer it will take for the turbo to spool up. So from this point of view, dump valves are beneficial. |
Yes, but how do you plan to increase the pressure downstream of the turbo's intake system without a throttle in the engine to restrict gas flow?
Also turbo lag and spool up are not the same. There is the inertia of the turbo shaft itself. This is finite and measurable simply because both it and the air flowing through have mass. If the turbo shaft assembly were massless then rotational inertia would not be an issue; therefore turbo latency would not exist.
Q E not D