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Turbo Petrol Vehicles Fitted With Surbo

The Surbo is usually fitted for normally-aspirated cars, but there is a growing list of turbocharged vehicles fitted with the Surbo. Aren't turbocharged engines already very powerful? They are when the exhaust gas-driven turbocharger is providing boost when the engine is around 3000 rpm. Below that, the exhaust gases are too weak to turn the turbocharger at a sufficient speed to make it compress the air coming in through the air filter. While this happens, the turbocharger represents a load to the engine via the exhaust, and the time to overcome this by pressing more on the accelerator is called turbo lag.

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.

Petrol turbocharged vehicles fitted with Surbo:

  • Audi Q5 2.0
  • 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.

  • Audi TT 2.0 2008 200 bhp
  • The Surbo was put in the modified metal pipe after the air filter. Lots of boost whenever gear kickdown occurred.

  • Audi A3 1.8 2009 170 bhp
  • The Surbo was fixed in the original pipe parallel to the windscreen. The result was a lighter throttle, smoother power and easier revving.

  • BMW X6 3.0 twin turbo
  • 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.

  • Chevrolet Orlando 1.4 turbo
  • After fitting, the owner said the engine was not so gruff as before.

  • Citroen DS4 1.6 turbo 156 bhp
  • 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.

  • Daihatsu Charade GTti 1.0
  • 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.

  • Fiat Bravo 1.4 Tjet (photo below)
  • This was a semi-auto, and gearchanges became smoother with Surbo. The turbo surge was strong yet accelerator pressure was little. The owner wrote: "The Surbo device is good. I will as my friends to look for you."

  • Infiniti Q30 1.6 turbo
  • This had 154 bhp and the owner, who hardly revved, felt the improved power from a low speed.

  • Mazda CX7 2.3 turbo
  • This was fitted by our Brunei dealer, and he said that the the car felt smooth during acceleration and reacted quite fast.

  • 2012 Mercedes C250 CGi (photo below)
  • 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.

  • Opel Insignia 2.0
  • This car has 217 BHP and 350 Nm of torque and was a rocket with Surbo on, and with low residuals, is a good buy.
  • Peugeot 207 GTi 1.6 175 bhp
  • 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.

  • Peugeot 508 & 3008 1.6
  • The above, with the above engine at 154 bhp, was fitted with a Surbo in its air filter outlet. A 3008 with the same engine also got a Surbo. The driver could finally feel the turbo at low rpm, where he normally drove. It could surge strongly to higher rpm with Surbo. This engine is used on other Peugeot models (308, 5008, RCZ), and also on Citroen (C4, C4 Picasso, Grand C4 Picasso, C5) and DS (DS4) models.
  • Subaru Forester 2.0T
  • When the gears were held, the rpm meter would swing easily to red line.

  • Subaru Forester SH9 2.5 auto
  • 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.

  • Subaru Impreza WRX STi 2.5
  • 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.

  • Subaru Legacy 2010 2.5 GT (photo below)
  • Subaru Legacy 2010 2.5 GT

    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.

  • Toyota Starlet 1.3 turbo
  • Please read the owner's testimonial

  • Volvo S60 T5 2.5
  • This was a repeat Surbo purchaser, the first time for his Alfa Romeo.

  • Volvo S60 T4 1.6 (photo below)
  • This had some initial lag and fuel consumption of above ten litres per 100km, and the owner was hoping to improve it with Surbo.

  • Volvo XC90 3.0
  • 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.

  • VW Tiguan 2.0 (photo below)
  • The owner called to say that there were fuel savings.

  • VW Jetta 1.4
  • The Surbo managed to cut turbo lag for the above model. Another owner said the car became smoother.

  • VW Tiguan 1.4 (up to 2015, twin charged)
  • 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.

  • VW Jetta 1.4 (twin charged)
  • 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.

  • VW Golf 1.4 GT 168 bhp
  • The Surbo is running on the above, owned by an old customer. So far so good, he said.

  • VW Passat CC 1.8
  • The rpm would swing rapidly from 3000 rpm to 5000 rpm when Surbo is activated at half throttle, before gearchange occurs automatically.

    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.

    Click here for list of diesel turbocharged vehicles:

    Related pages:

  • How to reduce turbo lag
  • How the Surbo can aid a turbocharger
  • Surbo system analysed, when fitted on turbo petrol engines
  • How Surbo transforms your car:

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