A supercharger and a turbo charger do basically the same job, that is the job of forced induction, so the fuel/air mix going into the engine is under greater pressure than atmospheric, so more fuel is going in per cycle (and more air) therefore it is more combustible which yeilds greater power.
They way they go about achieving this is different, the supercharger is driven via the cam belt directly off the crank, so it takes some of the engine power to drive it (obviously it takes far less than it adds or it would be pointless), this has the advantage that it is running across the entire rev range.
The turbo charger is run from the exhaust (waste) gasses so it does not add any additional load to the engine, the disadvantage is that it takes a certain amount of revs to get the turbo to spool up (enough rpm so enough exhaust gasses). The revs required depend greatly on the displacement (cc of the engine) and the size of the turbo, typically they are designed to spool up anywhere from 2,500k-4,000k (but can be higher). A 1.4L engine wouldn't flow enough gasses to run a big turbo, you could find it coming on boost (useful turbo range) over 6k and then red lining shortly after.
Generally turbos fair better than superchargers higher up the rev range, so when a engine has both, the supercharger comes in low revs runs until the turbo comes fully in and then backs off and lets the turbo do the rest. Of course with the overlap coming in so that it gives a smooth and linear power curve.
There are of course other ways to do this, just a supercharger, just a turbo, twin turbos running in parellel (older skylines), turbos running in sequence (bwm new diesel, rx-7 etc).
I'd suggest look at what ecu tuning options there are for your current set up and save your cash for a bigger engined model later on, it might be within safe limits to up the boost of your current turbo a bit to get more power, a supercharger should give a bit more low down power but it's not going to make any huge different, also you'll have trouble finding a better turbo that mates with a 1.4L engine that doesn't sacrifice driveability while yielding good gains (also then all the extra stress on the engine and drive train).
Cheers.
They way they go about achieving this is different, the supercharger is driven via the cam belt directly off the crank, so it takes some of the engine power to drive it (obviously it takes far less than it adds or it would be pointless), this has the advantage that it is running across the entire rev range.
The turbo charger is run from the exhaust (waste) gasses so it does not add any additional load to the engine, the disadvantage is that it takes a certain amount of revs to get the turbo to spool up (enough rpm so enough exhaust gasses). The revs required depend greatly on the displacement (cc of the engine) and the size of the turbo, typically they are designed to spool up anywhere from 2,500k-4,000k (but can be higher). A 1.4L engine wouldn't flow enough gasses to run a big turbo, you could find it coming on boost (useful turbo range) over 6k and then red lining shortly after.
Generally turbos fair better than superchargers higher up the rev range, so when a engine has both, the supercharger comes in low revs runs until the turbo comes fully in and then backs off and lets the turbo do the rest. Of course with the overlap coming in so that it gives a smooth and linear power curve.
There are of course other ways to do this, just a supercharger, just a turbo, twin turbos running in parellel (older skylines), turbos running in sequence (bwm new diesel, rx-7 etc).
I'd suggest look at what ecu tuning options there are for your current set up and save your cash for a bigger engined model later on, it might be within safe limits to up the boost of your current turbo a bit to get more power, a supercharger should give a bit more low down power but it's not going to make any huge different, also you'll have trouble finding a better turbo that mates with a 1.4L engine that doesn't sacrifice driveability while yielding good gains (also then all the extra stress on the engine and drive train).
Cheers.
