Diagram below shows the air pressure accumulation within the Surbo system as the Surbo is activated through Stages 1 to 3.
P1 is the initial inlet vacuum, P2 is the Surbo's pressure setting, and P3 is the back pressure formed by a relatively closed throttle.
| Stages/ {Surbo System Component} | {Surbo (red), presses air into grey pipe} |
{Oil chamber, in orange} | {Throttle, in light grey} | {Intake manifold, in pink} | {Engine, bottom block in pink} | Exhaust (not coloured), with turbocharger |
| initial acceleration (Stage 1) | air flows straight through Surbo | Throttle is gradually opened for acceleration | absolute pressure rise due to larger throttle opening | Engine is sole energy source | the exhaust gases may not be fast enough at a low rpm, so the turbocharger is not delivering boost yet. This is inherent in turbo engines, and is called turbo lag. | |
| pressure accumulation (Stage 2) | begins to output cross-jets and form vortex internally | fills up with engine back pressure | is relatively closed for 1 second to generate a back pressure towards the Surbo | mild pressure buildup due to turbocharger gaining speed | cylinder pressure increases due to lessened acceleration, and yet turbo boost that's just beginning | exhaust back pressure increases, ready to blast air out, and begins to spool up turbocharger earlier than usual, thus cutting turbo lag. |
| vortex (Stage 3) | spins air internally creating deep suction | acts as air pressure accumulator | relatively opened and varied slightly around half way point | increasing pressure boost from turbocharger | higher cylinder compression because of turbo boost | turbocharger blows more air into engine, which puts out a stronger exhaust, which in turn increases the turbo's spinning speed. This is a stronger cycle than before. |
Read the similar study for diesel vehicles.
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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