Below is a testimonial from the owner of a 4AT Nissan Latio with Surbo:"My dad in law says more power. RPM can hit almost 7000 rpm haha."
In another comparison of 2 cars with the same weight, a 125 BHP Honda Civic ESi with Surbo outran a 160 BHP Civic VTi, so that seems like a power increase of 30 percent!
To get higher rpm, there must be faster air flow, so that the pistons are not held back. The Surbo helps to take in more air, to push the pistons to a higher speed.
1. After initial acceleration, upon slightly closing the throttle, the back pressure causes the Surbo to turn and jet the air at an angle (a press force), spinning air within itself into a suction vortex (a pull force), and a third (engine vacuum suction) force comes when the accelerator is pressed again. With three forces, air passes through the engine faster. By 1/2 throttle, the engine will reach the rpm limit!
At this rpm limit, the fuel cut-off will occur for most fuel-injection engines. For carbureted cars, there is no such limit so the revs can be extended straightaway. For diesel vehicles fitted with Surbo, the red line on the rpm meter is achieved easily with the accelerator pressed halfway, and many achieve 5000 rpm.
The Surbo also helps automatic cars rev higher. Automatic gearboxes normally change up at 3000 rpm in D mode. However, the Surbo extends the revving in D mode, with half throttle sending the rpm meter to at least 4500 rpm for most makes, and even to the red line in the case of Kias and Hyundais, which have rather sporty gearbox programs.
For continuously variable transmission (CVT) cars, the rpm will go to 3500 rpm instead of 2500 rpm during acceleration, shortening the time to get to speed. At cruising speed, due to increased torque from the Surbo, the rpm may go lower than normal, indicating a higher gear ratio, but as soon as acceleration is needed, a light prod on the accelerator will cause the rpm to rise again (gear kickdown) for faster pickup.
Examples of rpm-delimited Surbo-equipped manual petrol cars
Related page:
Surbo System's Energy Analysis shows how the Surbo can take your engine to its RPM red line with half throttle, and even past the RPM limit.
Watch the video above showing how an engine revs with Surbo. Or watch it with the How it works page.
Above: video of Volvo XC90 T8 with Surbo, sprinting to 130 kph.
Above: video of Volvo XC90 T8 with Surbo, sprinting to 211 kph.
Above: video of Volvo XC90 T8 with Surbo, sprinting to 224 kph.
More torque and BHP (dyno test)
Quick revving (1/2 throttle to RPM limit)
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