In the halcyon days of turbocharging, Porsche, Mazda, Subaru, and Toyota all offered cars with twin sequential turbos. Now only Bugatti does it.
has a fabulous explanation of the 959's complicated plumbing system, but all we really need to know here is that the system reduced turbo lag significantly. If the driver went to wide-open-throttle at 2500 RPM, the 959 would reach its maximum 14.2 psi of boost in two seconds, whereas with a simple parallel twin-turbo setup, the same would take 6.5 seconds. Out around Sonoma, the 959 felt like nothing else.
So, does sequential turbocharging work? Yes and no. At the time, these setups were a huge technological step forward, and we were extremely impressed at the time, but by today's standards, sequentially turbocharged cars feel odd. You wouldn’t call them super laggy, but the introduction of the second turbocharger is never 100-percent seamless. It's almost as if there's a momentary flat-spot in power delivery, then wham! Off to the races.That's not the main issue, though.
Papadakis Racing exclusively uses single turbos in its 2JZ builds, as simplicity and reliability in its motorsports-prepped engines is more important than low-end response. Many still build twin-turbo 2Js, but it's rare you'll find one with the sequential setup intact. Most tuning the RX-7's twin-rotor ditch the sequential turbo setup for the same reasons, and because the Mazda system is unreliable.
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