A SUMMARY:
Driven the usual way, a Surbo-equipped automatic vehicle will accelerate from rest instantly, rev a bit higher, and be able to kick down gears easily. The improvement will be as in the Dynamometer Test Results, or just about 7 percent improvement.
1. Just accelerate to pull the air straight through the Surbo, then 2. release the accelerator slightly to cause the air to turn through the Surbo and become pressurizing jets, and then 3. press the accelerator slightly again to send the air pressure in for more speed.
DETAILED EXPLANATION:
Accelerator pressure controls the opening of the throttle. The Surbo (in red) is fixed tightly in the air pipe and does not move. Its sharp output end faces -> the throttle, so that air flows -> through the Surbo towards the throttle and then into the engine.
Stage 1: when the accelerator is pressed, the throttle opens and the air will go straight -> through the Surbo's straight corners, and through the throttle opening.
Stage 2: once the car has gathered speed, the accelerator can be eased off slightly, and the closing throttle causes the air to press <<-backwards towards the Surbo, resulting in a back air pressure, and the straight flows avoid the back pressure and turn anti-clockwise under the Surbo's curved fins and converge to become jets at their sharp tips, matching ->><<- the back pressure.
Stage 3: if the accelerator is stepped on slightly again, the throttle opens a bit more, and the compressed air enters ->> the engine and it revs faster. This results in a pressure ahead of the Surbo, so the air streams continue to duck under the Surbo's sharp tips and jet, maintaining the pressure, and the engine revs higher. This turning of the air causes the round inlet of the Surbo (nearer to the air filter) to form a vortex which sucks more air in, hence the name Surbo (suction-turbo). The higher revs enable easier progress in the following gear (because that will start from a higher, stronger rpm). Cruising speed is reached sooner, so fuel is saved, at least by 10%.
If the gear is held constant (such as for manual or semi-auto gearboxes, or if the automatic gearbox allows high revving), the Surbo can send the engine to the rpm limit with just 1/2 throttle!
Watch the video above showing how an engine revs with Surbo. To return to this page afterwards, click the "back" button. A Surbo-ed motorcycle has been chosen so that the throttle action and revving on the tachometer can be shown together. Note the very slight accelerator movements (press accelerator/ release accelerator slightly/ press accelerator) to make the Surbo compress the air. For cars, just use your right foot to vary the throttle opening in the same way.
Related pages:
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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