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**Turboshaft** · 03-07-2010, 03:20 PM

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.

03-07-2010, 03:20 PM	#9 (permalink)
Turboshaft Member Wrench Pro Car: Focus 2.0T Join Date: Apr 2010 Location: Birmingham Posts: 40	Re: dump valves????????????????? 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.