Originally posted by Rara:
[QB]warmonger,
I attempted to refer to the fact that I was writing my first post quickly w/ the "quick, vague" comment at the beginning.
I also refer back to my comment about the application and how the system is set up being more important than which method of forced induction is chosen. btw, a sequential turbo setup, like the Supra, can get pretty darn complicated, and is pretty rare to see, especially in a kit form for a vehicle that was not originally turbocharged.
QB]
Points well taken Rara.
As far as the seq. turbos, you are definitely right about the complexity of the system.
I see I also started something by the looks of the post about "twin turbo".....
answer:
Early 90's import sports cars were using twin turbos or sequential in the case of Toyota, in the hopes of reducing turbo lag.
The lag seems to be mostly caused by the need to accelerate a turbo from lower rpm at idle to much higher rpms like at full throttle. With the sequential system, I kinda described my understanding ofwhy they used it in the earlier post.
I believe the twin turbo systems were just trying to beat the lag problem by using two smaller turbines to provide the output of one bigger one becuase the smaller ones could be spooled quicker due to their lower mass.
I suppose you could use twins or sequentials, but as Rara pointed out the complexity is much greater. Cost is also an issue. There is another factor today about the materials. The materials used today (almost 10 years after the twin turbo nissan 300zx) are much stronger and allow turbos with less moving mass to produce outputs like older more massive ones.
warmonger
