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 | Illustrated: Chromed Turbo Charger and Injectors |
Turbo : Parallel Vs Sequential: The use of Twin-Turbocharger is a question of both efficiency and packaging. For larger engines, say, 2500 c.c. or above, it is better to use 2 smaller turbochargers instead of a big one, as small turbines reduce turbo lag.
Today, performance cars no longer employ a large single turbo like the early 911 Turbo.
For V-shape and boxer engines, it is also recommended to use twin-turbo, because one turbo serves each bank shorten the turbo pipes and save a lot of space. Moreover, the shorter the pipes, the less turbo lag generates.
| Some twin-turbo engines have the turbos arranged such that exhaust flow from one bank of cylinders drives a turbo which boost the intake of another bank. This is actually the concept of "feedback loop", which helps reaching power balance between two banks.
Most twin-turbo engines have the turbochargers arranged to operate independently, each serves one bank of cylinders. This is so-called "Parallel Twin-Turbo".
An alternative arrangement, "Sequential Twin-Turbo", was designed to improve response and further reduce turbo lag. The turbos operate sequentially, that is, at low speed, all the limited amount of exhaust gas is directed to drive one of the small turbines, leaving another idle. Therefore the first turbine will accelerate quickly. When the exhaust flow reaches sufficient amount to drive both turbos, the second turbo intervenes and helps reaching the maximum boost pressure. Unfortunately, sequential twin-turbo requires very complicated connection of pipes (exhaust from both banks should reach both turbos; so do the intake pipes from both banks), thus is now losing interest from car makers. Porsche 959, Mazda 3rd generation RX7, Toyota Supra and Subaru Legacy are the only applicants thus far. | | :: Recommended Reading / Videos :: | | | |
| :: Recommended material containing aditional info about Turbo : Parallel Vs Sequential :: |
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