How much horsepower does a twin turbo add depends on various factors. Factors including the size of the turbos, the boost level, the engine's compression ratio, and other modifications to a twin turbo setup can add a significant amount of horsepower to an engine, ranging from 50 to 1000+ horsepower.
In general, adding a turbocharger to an engine will add anywhere from 40 hp to 300 hp, but in some cases, much more. In my eyes, a healthy boost of power would be around 50%. For instance, if your engine has 200 hp, you can push it to 300 hp without many reliability issues.
In terms of expenses, two smaller turbochargers are more efficient than one bigger one. However, some engines require twin-turbo kits for better and more efficient operation. This is related to V-type engines. They work much better together with twin turbochargers.
For four-cylinder engines and straight-six engines, both turbochargers can be mounted to a single exhaust manifold. The aim of using parallel twin-turbos is to reduce turbo lag by being able to use smaller turbochargers than if a single turbocharger was used for the engine.
One of the main advantages of twin turbocharging a 4 cylinder engine is the increased horsepower and torque. Twin turbocharging can also improve engine response, enhance fuel efficiency, and allow the engine to maintain boost pressure at high RPMs.
If the economy is your top priority, a four-cylinder is likely the best choice for you. A V6 engine will be able to produce a greater amount of power at a quicker pace and will be much more responsive to each tap of the gas pedal, able to quickly accelerate to high speeds.
You could have a single turbocharger for each cylinder bank (V6, V8, etc). Alternatively, a single turbocharger could be used for low RPM and bypass to a larger turbocharger for high RPM (I4, I6, etc). You could even have two similarly sized turbos where one is used at low RPM and both are used at higher RPM.
Twin-Turbo
As the name implies twin-turbos mean adding a second turbocharger to an engine. In the case of V6 or V8 engines, this can be done by assigning a single turbo to work with each cylinder bank. Alternatively, one smaller turbo could be used at low RPMs with a larger turbo for higher RPMs.
V-6 engines have improved performance compared to V-8 engines, especially when timing acceleration properly because there's less tendency to drift to the outer edge. However, you can lose a little bit of the power ceiling with the weight advantage.
Engines with two turbochargers increase air and fuel intake nearly twice as much as the same engine would without a turbocharger. Because of this, twin-turbocharged engines boast incredible performance that you'll enjoy whether behind the wheel, sitting in the passenger seat or watching from the sidelines.
There are pros and cons to each setup. Single turbo systems are typically more efficient because the exhaust gases travel along a simpler, more direct route. Twin-turbo systems can make more power because they produce more boost. However, they are typically more complex.
Although larger turbochargers provide more boost, this comes at the expense of responsiveness – meaning that lag can be more of an issue. Small turbochargers begin working at much lower engine speeds, which make them more responsive.
A smaller engine 1.0 lit petrol turbo can generate high torque of 178 nm torque (as in Kushaq) whereas some engines of 1.5 lit (Maruti s-cross) generate lower range 138 nm torque.
Pretty much anything can be turbocharged, whether it's an inline-3, or a V16, or a V8. You just need a good flow of exhaust gas to push the turbine around, and if even that is somehow difficult, use a supercharger instead.
A turbocharger works with the exhaust system and can potentially give you gains of 70-150 horsepower. A supercharger is connected directly to the engine intake and could provide an extra 50-100 horsepower.
A V6 cylinder turbocharged can produce a power output more than a V12. So only the engine capacity doesn't make any engine more powerful. Yes, it is the main chunk power house, but there are a lot of other factors.
A V8 engine is generally faster than a V12 engine for a few reasons. Firstly, a V8 engine is typically smaller and lighter than a V12 engine, which means it is less cumbersome and has a lower center of gravity. This can give the car an advantage in handling and acceleration.
Both systems have their merits, but the benefit of a twin-turbo is that it has the potential for reductions in turbo lag compared to one single turbocharger doing all the work. The twin-turbo delivers lower boost pressures to reduce turbo lag, but the combination of the two turbines creates plenty of power.
Instead of adding a turbo to get more power out of the same engine, they are adding a turbo to get the same amount of power out of a smaller engine. The turbo itself doesn't save gas, but using the smaller engine does. Turbos are often used together with direct injection.
Turbochargers are not as powerful as superchargers, but since they run off recovered energy in the form of exhaust gases, they improve the engine's overall efficiency. A turbocharger also utilizes a wastegate that reduces the emission of exhaust gases into the environment.
1.0-litre engines
Engines of 1.0-litre or less typically feature three or four cylinders and many now use turbochargers for extra power.
Fans of Jaguar and Range Rover products may know top performance versions from both companies are powered by muscular supercharged V8 engines, but in recent years the tech has fallen out of favour. That's because, like the car's water pump or alternator, a supercharger takes its power from the engine.
Depending on driving conditions, the V8-6-4 would run on 4, 6, or 8 cylinders, switching from one mode to the other and back again as needed.