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Twin charging - (supercharger and turbo) pros and cons ?


plasticdash

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surge happens when the turbo can make more boost and is restricted to less that the surge line amount via wastegate or inlet (not pressure side) restrictor

it surges because it cannot maintain less that that pressure at a flow less that that value and more than 0

as it spools it hits a point were there is not enough ex gas to force compression but enough to make some pressure but not maintain it

so it surges to presure...then the pressure overcomes the turbine drive and stalls the compressor

because the motor is supercharged it has far more ex presure than what a normal engine of a given size woudl normally have so sized correctly you wont have the intake pressure exceed the given turbine power

compressor maps are a good basis but you need to overlay them with turbine maps and engine flow to get a idea on what it will do

you still need to size your turbine/compressor combo corectly for the application and twincharging will not bode well with a poorly designed setup

just my 2 cents

ive written this as simply as i can so everyone can get a idea of what im saying ..so somethings are not exact for teh sake of understanding

cheers

even i understanded that , good show old chap

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