Dynamometer Test Results For The Surbo

    This may take a few minutes to download. You might want to take a break. 1 Surbo vs no Surbo 4x zoom In the development Surbo car, the Peugeot 405 1.6, the Surbo was dynamometer tested to prove that it gave more torque and power than the same car with no Surbo. The graph above shows increased torque and power over the whole rpm range (thick line=Surbo, dotted {faint} line no Surbo). The torque increased by 108/93 Nm, or 16%, and is more accessible as it peaked at 3300 rpm instead of 4300 rpm. Power was up by 69.4/65=6.7% at the maximum.

    Twin Surbo vs no Surbo 4x zoom The Twin Surbo (thick line) was even more torquey, as its torque peaked at an even lower 2850 rpm (103.5/87.7=18% more at this common cruising speed). This makes driving or overtaking feel good on the highway.

    1 Surbo vs Twin Surbo: rpm 4x zoom This graph shows that the Twin Surbo was stronger in torque from 2450 rpm to 3150 rpm. Therefore for those who do not rev much, or who cruise* in 5th between 90 kph and 115 kph, the Twin Surbo will help them save more fuel. For superhighways where speeds exceed 115 kph (such as the Malaysian highway at an allowable 125 kph), the single Surbo will save more fuel due to greater torque. This also means that the single Surbo is better for revving between 3150 rpm and 4900. The Twin Surbo's power peaked at 5100 rpm, earlier than the single Surbo, and this may mean different tops speeds depending on the gearing.
    *Gearing (5th of this car): 110 kph at 3000 rpm, or 36.67 kph/1000 rpm, or 22.63 mph/1000 rpm.

    1 Surbo vs Twin Surbo: time 4x zoom This is the time graph comparison between the single Surbo and the Twin Surbo. The Twin Surbo (faint line) had more torque than the single Surbo (thick line) from 1.5 seconds to 2.7 seconds. The single Surbo led from the 3rd to close to the 6th second. The Twin Surbo reached its peak power of 69.2 HP in 6 seconds but the single Surbo took 8 seconds to hit it maximum of 69.4 HP. The physical significance of this difference can only be seen by road testing.

    Full Power With Surbo Activation 4x zoom Power is maximised when the Surbo is activated (as far as possible like in How It Works). The peak power was 71.65/65=10% more this way.

    Note: The testers were fixed in place of the wheels. 4th gear was used and the engine was run at steady speed before it was pushed to cutoff in 8 seconds each time. The closely-spaced time stamps show that the car was tested with two surbos, one surbo and no surbo, in that order. This removes any long-term run-in effects, (eg. possible carbon cleaning due to higher air mass flow) or changes in engine condition due to servicing or modifications. The efficiency loss of around 20% (from the factory 90 bhp) could have been due to drivetrain losses and engine wear. Despite these, improvements were reflected.

    For a counterpoint, please also read the Better Performance page for acceleration and top speed test results.

    About Anything (Quick Reply) Email Us! Surbo HQ Home No Obligation Have Your Car Assessed Inform A Friend About Surbo Pass It On!