A turbocharger consists of a turbine and a compressor mounted on a single shaft. The turbine disc consists of vanes to guide the exhaust gases on to the turbine blades which in turn rotates the shaft and the compressor. At high engine rpm the turbine rotates at 90000 rmp plus speeds resulting in extra compression and chocking the engine. To avoid chocking of engine a mechanism called bleed valve is provided to bleed extra exhaust. Whereas at low engine rpm the compressor is not able to provide enough compression (called turbo lag). To overcome this the Variable Geometry Turbo consists of movable turbine guide vanes, one end of guide vane is pivoted and other end made movable to increase or decrease amount of flow to the turbine blades. At lower engine rpm the guide vanes are wide open to allow maximum flow hitting the turbine blades at an optimum angle to rotate it faster (this avoids turbo lag). At higher engine rmp the guide vanes are closed to reduce the inflow on turbine blades avoiding high speed rotation of turbine. This altogether omits the requirement of bleed valve at high engine rpm.
T on 2011-03-25 15:34:11.0
Variable Geometry Turbocharger acts like a twin turbo on on the engine and boosts the power ratings and efficiency figures.
It is hard to pick one out of the cars that you have selected. Both cars are quite nice to drive and compete neck to neck with each other. i20 has got some extra comfort features like glove box cooling, Air Quality Control and rear AC vents in Hyundai i20 Asta 1.2 . On the other front Baleno has ABS, EBD and dual airbags which are standard across all the variants. Baleno is lighter as compared to i20 which helps it to attain higher speed in less amount of time. i20 on the other hand is heavy and is quite confident to drive over turns. Our pick here would be Baleno as it is fresh and also is easy to maintain. On top of that, it offers you better fuel economy. Click here to check out the comparison.
Both cars are great, Duster is compact, less powerful and short in height hence is easier to maneuver in traffic. Due to the less power that it generates, it is also more fuel efficient. On the other front, Safari is massive, it has a bigger engine, it is bigger is dimensions and hence, is less fuel efficient. In order to choose one out of these, you need to look at the conditions you would drive your car in. If you are going to drive mostly in cities, go for Duster as it is more "Car" like and if that is not the case, go for Safari. Safari would not be a good choice if you drive mostly in traffic as it hefty and massive and therefore, it isn't easy to maneuver it. When we drove them, we got about 13 KMPL by Duster and 10.4 KMPL by Safari. Click here to take a quick look at the features on offer.
Personally, I'd pick the diesel over the petrol. The petrol not only feels under-powered, but isn't too fuel efficient either. Moreover, since it isn't available in the top trims, it misses out on most feel-good features such as touchscreen infotainment, automatic climate control. Also, it skips out on the passenger airbag which we think is a big negative. Talking about the engine performance and drive It's smooth, and relatively quiet. Gets the job done inside the city easily. Clutch is light, but travel is still slightly long. On the highway, you get the feeling that it is under-powered..
Both of them belong to different segments. You will be able to purchase the base variant of Brezza in the price of the top end KUV 1OO. If features are something that you look forward to, you should go for KUV 1OO and if rigidity and better space is something that you are looking for, you should choose Brezza. Click here to check out the comparison.