Turbo Engine Exhaust System

Exhaust backpressure on turbo engines is one of the most misunderstood aspects in tuning to many people but it s pretty simple it s not good.

Turbo engine exhaust system.

The compressor pressurizes the air going into the pistons. And one way to make an engine more efficient is by upgrading its exhaust system. Given the installed locations of the turbochargers custom formed exhaust pipes are required to route exhaust from the turbos to the remainder of the exhaust system. General rules of thumb are easy to grasp but applying them correctly is where things get tricky.

Turbocharger lag turbo lag is the time required to change power output in response to a throttle change noticed as a hesitation or slowed throttle response when accelerating as compared to a naturally aspirated engine this is due to the time needed for the exhaust system and turbocharger to generate the required boost which can also be referred to as spooling. Tuning an exhaust system to a given application is a case by case basis challenge. This is an example of a twin turbo system fitted to an ls7 engine which increases rear wheel horsepower to 1 000 under full boost. The post turbo back pressure dropped from 1 9 psi with the 3 0 inch exhaust to just 0 9 psi with the 3 5 inch system.

The exhaust from the cylinders spins the turbine which works like a gas turbine engine. One of the biggest challenges car owners and enthusiasts face is increasing their engine s performance. Many cars manufactured after 2005 might need a tune up or an upgrade of the exhaust system. The turbine is connected by a shaft to the compressor which is located between the air filter and the intake manifold.

So intercooler are then used to cool the intake air to the engine from a turbo system. As most of you know the design of turbo exhaust systems runs counter to exhaust design for n a vehicles. Fwiw i m an turbocharger development engineer for garrett engine boosting systems. The displacement exhaust valve size induction system cam profile exhaust port design and rpm range all factor into deciding what form the exhaust system should take.

The turbocharger is bolted to the exhaust manifold of the engine. An alternative placement for a turbocharger is to have it rear mounted as part of the exhaust system. On non turbo engines backpressure is a single issue the pressure in the exhaust system but on a turbo engine it s actually two issues pressure in the post turbo exhaust system and pre turbine backpressure in the exhaust manifold. The final step was to install the 4 0 inch race exhaust which pushed the power output to an even 919 9 horsepower at the same 6 400 rpm while peak torque rose to 807 lb ft of torque at 5 500 rpm.