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Twin Turbos.....

635 Views 14 Replies 9 Participants Last post by  HIBBoyScott
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)..
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Sequential turbo is good for daily driving because you can almost eliminate the feeling of turbo lag, but still have lots of power at high rpm. The problem with sequential setup is its complexity compared to the normal twin turbo setup. I have heard many of the RX-7 owners had problems regarding the vacuum line that activate the second turbo in the sequential setup, so this could be one of the reasons why not everyone is going with the setup yet.
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