In a petrol engine, when the accelerator is pressed more, the vacuum in the engine manifold drops. However, the vacuum is the only force that draws air into the engine. When the accelerator is pressed fully, the vacuum falls to zero, and air induction force is minimized. Also, with the accelerator on the floor, fuel injected is maximized, and over-fueling occurs. Acceleration quickly becomes zero for the gear, and a gearchange up is necessary for further acceleration. Acceleration begins to slow significantly from third gear, and in the top gear, the rpm limit cannot be reached. Therefore, the top speed of a typical 1.6 litre sedan is only about 190kph.
Since the accelerator is never floored, manifold vacuum does not fall to zero, but continues to draw air into the engine forcefully together with the Surbo's jets and vortex, so acceleration is extended till the rpm limit is reached. With this 3-force (vacuum, jets and vortex) air induction system, the Surbo-assisted vehicle is so strong that it will reach the rpm limit even in the top gear, and top speeds of 220 kph for 1.6 litre sedans are routinely reported by customers.
Below: testimonial from owner of Subaru Impreza WRX 2007:"Boss the Surbo is really good and fun. Remember the top speed I said I could go, and last week I tried, and it went 20 kph more."
The following cars have been recorded by customers at speeds higher than their original top speeds (for everyday use, it also means easier cruising and fuel saving because cruising speed is a fraction of the top speed).
| Make Of Car | Original Top Speed | Highest Speed With Surbo | Achieved In Gear | Remarks |
| '01 Citroen Berlingo 1.9 Diesel | 130 kph | 140+ kph | 4th or 5th | With aircon on |
| '89 Honda Civic 1.3 GL | 170 kph | 185 kph | 5 | |
| '97 Mitsubishi Lancer MR 1.6 | 210 kph | 220 kph | 180 kph in 3rd | R Wong |
| '93 Opel Vectra 1.6 | 190 kph | 205 kph | ||
| '98 Proton Wira 1.6A | 160 kph | 180 kph | 4 | K H Tan |
| Peugeot 106 | 115 mph | 118+ mph | 5 | UK-Cruise |
| '89 Peugeot 405 1.6 | 180 kph | 188 kph | 5 | 3/4 throttle only, 6 on board |
| Proton Gen2 1.6 | 190 kph | 220 kph | 5 | Mizlan |
| Proton Putra 1.8 | 208 kph | 215 kph | 5 | |
| '96 Rover 416 HHR | 190 kph | 220 kph | 5 | |
| '95 Skoda Felicia 1.4 | 96 mph | 100 mph | 5 | Peter Allen |
| '07 Subaru WRX | +20kph | Owner in testimonial above | ||
| Toyota Starlet 1.3 16v turbo | 120 kph | 150 kph | 3 | Chris of Kota Kinabalu |
| Toyota Starlet '89 1.0 | 150 kph | 170 kph+ | 5 | |
| Toyota Corona '98 1.6 | 190 kph | 220 kph+ | 5 | 245+ with race cam and higher rpm limit, on Pasir Gudang track in Johore Malaysia |
Note: "+" indicates that the throttle had not been put to the floor yet. For more reports on improved speed for automatic cars, see the Petrol Automatic page.
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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