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Originally Posted by ramie2400  @Viper: 1question,does the turbo in petrol car remains "ON" all the time,or kicks at a certain rpm,because ive driven the verna diesel turbo,as the turbo shuts after barking the sudden pick-up dies and the car becomes slow,does this same happenes with the petrol cars too?? |
It happens with all turbos...
1) There is a lag phase before the turbo spools. This is because the velocity [Force] of exhaust gas is not high enough to spin the fan blades, which in turn spin the Screw fan forcing air into the cylinders.
2) The turbo is spooling, and air is therefore forced into cylinders. Boost is present
3) RPM is now so high that turbo is already spooling at full speed. So you don't feel any further increase in acceleration. It is not that you're faster than NA, It's that you're not faster than when the turbo motor is in it's power band...
4) Verna and the other turbo cars available use tiny little turbos which force air in at low pressure. That's to maintain FE along with a boost in power. Verna uses a VGT which is a Variable Geometry Turbo. Those are small turbos meant to reduce turbo lag [a lighter fan spins with lower force than a heavier one]. However it maintains a larger power band using veins that open up thereby making it a larger turbo [From my understanding]
Variable geometry turbocharger - Wikipedia, the free encyclopedia 
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