The Surbo is known to raise the idle rpm of engines even at idle, because it concentrates air suction through the air filter, and it is activated by throttle back pressure during acceleration. At idle, as the throttle is opened just slightly to allow the engine to run, the throttle back pressure created works up the Surbo slightly, and the resultant exhaust pressure increase pushes the turbocharger to a higher speed and momentum. Therefore initial turbo lag is reduced, the car takes off smartly, and when the Surbo is properly activated by relatively closing the throttle, the thicker exhaust gases that result press the turbocharger to spin faster, and so significant boost comes earlier. Fuel is saved due to the reduced throttle pressure, as is emission.
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The Surbo was fixed in the original pipe parallel to the windscreen. The result was a lighter throttle, smoother power and easier revving.
The Surbo was installed in the pipe after the air filter. The owner said he could feel the Surbo, even when operating at very low rpm.
The Surbo was installed in the pipe after the air filter. There was quite a turbo surge with Surbo on, considering that it was such a heavy car.
The Surbo was put in the modified metal pipe after the air filter. Lots of boost whenever gear kickdown occurred.
The Surbo was put at the inlet of the air filter and managed to impress the owner, said he would tell his M3 friend about it.
After fitting, the owner said the engine was not so gruff as before.
Strong surge after Surbo activated, and with minimal throttle pressure. More power than most people need so accelerator will be eased off soon and fuel saved, as reported by owner. Pic similar to Peugeot 508 below.
At red line, the owner exclaimed that the turbo was not even on yet. In this case, the turbo was worn, leaking or not working well, and the Surbo was able to make the engine come alive again due to increased axial (straight-line) pressure made at the turbo's fresh air inlet and extra exhaust pressure spinning the turbo, and also raising compression in the engine itself.
This car has a 7 speed auto transmission and a 1.8 litre turbocharged engine making more than 200 bhp. The owner said that the idling became smoother. He wanted more turbo boost below 1800 rpm, and said that the Surbo made some improvement, like giving higher revs and a lighter throttle. There was little deceleration even with the foot off the accelerator, and easier automatic down shifts. Also, overtaking was simpler to prepare and safer, because with the Surbo assisting the engine, it was easier to feel when the turbo was coming.
The 2007 Mercedes A class turbo was fitted with Surbo. It brought back some of the turbo's drama.
The Nissan Qashqai 1.2 and the Pulsar 1.2 where both equipped with Surbo, which helped the low end power, as both were CVT cars which did not rev much.
This Surbo user told a story when he came again to have the Surbo installed in his wife's Peugeot 307 later. His story was that in the past, he had a Subaru Impreza WRX STi, which he had driven back to and left behind in India, meaning he was a fast car driver. What he did was on a trip to Penang Malaysia in the Surbo-equipped 207 GTi, he started off in Johore Bahru with a friend in another STi, but he finished an hour in front of the STi at Penang. Perhaps it was because he saved so much fuel that did not have to stop so many times at petrol stations, or that the 207 GTi ran cooler than the STi, which had to stop more often to cool its turbo.
When the gears were held, the rpm meter would swing easily to red line.
The owner said that as backing off the throttle made the Surbo work harder and the car go even faster, this was at a new level. The blow off valve used to activate at 2500 rpm, but using the Surbo with less accelerator pressure, blow off occurred at 3500 rpm instead, giving more headroom. He would be going to tune the turbo system settings to take advantage of the new found power.
The owner of the Subaru Impreza WRX STi 2.5 said that with the Surbo, fuel consumption was lower and there was some mid band improvement. Another 2.0 automatic WRX (2007) fitted with Surbo had a 20 kph increase in top speed.
The driver had come looking for a lighter throttle feel, and found it with the Surbo. The turbo came easily, by accelerating and just holding the accelerator (which got the Surbo on). With the Surbo, which he said was a lot of fun a week later, the turbocharger's blow-off valve did not activate anymore. It was possible that the Surbo was aiding the engine to rev faster, and so the engine would run ahead of the turbo, and therefore the turbo boost did not build up to its limit. This will help to avoid the turbo lag that occurs immediately after blow off if acceleration is continued, because the turbo's pressure would fall and it takes time to build up pressure again.
Please read the owner's testimonial
This was a repeat Surbo purchaser, the first time for his Alfa Romeo.
This had some initial lag and fuel consumption of above ten litres per 100km, and the owner was hoping to improve it with Surbo.
In the case of the Volvo XC90 3.0, the improvement was more power over second gear humps, as the rpm was too low for the turbocharger to be properly spooled. The Surbo helped to cut some of the turbo lag at very low rpm, by delivering a denser exhaust stream that spooled the turbocharger up earlier.
Done by our dealer in Thailand, this 407 bhp supercharged and turbcharged hybrid had a "violent first gear" and could reach top speed very quickly. Videos to be uploaded soon.
The owner called to say that there were fuel savings.
The Surbo managed to cut turbo lag for the above model. Another owner said the car became smoother.
The Surbo, together with the original supercharger and turbocharger, made this 1.4 seemingly stronger than the 2.0 above! Gearchanges and pace through corners were terrific. Fortunately roadholding was good.
The result was very intense turbocharging even at a low rpm. For another Jetta doing 9 km per litre with a turbo that its mechanic said was worn, with Surbo at half throttle, it could zip from 3000 rpm to its rpm limit in a split second, both in first and second gears. No more road to test in third gear on that day. If third gear and subsequent gears were made shorter and more gears added, we think that the performance would be scintillating.
The Surbo is running on the above, owned by an old customer. So far so good, he said.
The rpm would swing rapidly from 3000 rpm to 5000 rpm when Surbo is activated at half throttle, before gearchange occurs automatically. Pic similar to Tiguan above.
As the Surbo brings the engine to the rpm red line with just half throttle when the gear is held constant, and since the throttle is not floored, it means that the pressure in the turbocharger could still be well below the blow-off pressure value even at red line, and therefore therefore a higher rpm limit may be set by car makers, so extending the peak power of the turbocharged vehicle.
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.
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