Twin Turbos.....

638 Views 14 Replies 9 Participants Last post by HIBBoyScott, Nov 14, 2000

EricK

Discussion Starter · Nov 13, 2000

When you look at cars like the 3000GT VR-4, 300ZX turbo, Mazda RX7 turbo, and Toyota Supra turbo (all since extinct by the way) they all have dual turbos. In the 3000GT and 300ZX you get the boost of both turbos at the same time. However, the RX7 and Supra have a sequential turbo system in which you get the first turbo intially and the second one further up the RPM range.... Which is better...?? I have driven the Toyota Supra turbo and have noticed that second surge around 4000 RPM's or so. I'm not sure about the S4, but when my friend drives his I don't notice that the individual turbos are activated sequentially (due to the linear power deliver...... Just a thought for you guys to ponder. Personally I liked the turbo system of the 300ZX more than I did the Supra (with the boom.. BOOM)..
Eric....

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EricK

Discussion Starter · #6 · Nov 13, 2000

Well I remember back in 1988 reading a Car & Driver magazine road testing a Ferrari F40 (twin turbocharged V8) & Porsche 959 (twin turbocharged Flat 6) in Europe... They said that there was a 4000 RPM wakeup call in both cars at which point the engines accelerated like crazy to the redline (7750 RPM = redline for the F40).... So I'm assuming both of those engines had sequential turbo systems as well...
Eric....

side note (although F40 was released in Europe in 1987, it didn't hit our shores till 1990).....

[This message has been edited by EricK (edited November 13, 2000).]

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EricK

Discussion Starter · #8 · Nov 13, 2000

Originally posted by fishtail:
i think the S4 is a bi turbo which means that each turbo is rigged to only apply boost to one bank of cylinders (3) which is why the boost is seamless and available at low rpms... can anyone confirm this???

Yes, I can confirm that... you're right... http://www.chip-tuning.com/usa/fzg/ukaudis4.html
Eric...

[This message has been edited by EricK (edited November 13, 2000).]

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EricK

Discussion Starter · #11 · Nov 14, 2000

Thanks for that description Scott...

Eric...

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