Case study: Chevrolet Captiva 2.4
Having installed the Surbo, the owner of the above car immediately noticed that the knocking noise during acceleration was gone. It is possible that for more power, car manufacturers are increasing engine compression to the limit. Vehicles have also become heavier due to added equipment and the load causes the engine to work harder and so the chance of knocking goes up.
A Nissan Latio 1.5 CVT turned up with an extra hot engine. The owner confirmed that there were knocking noises when he accelerated. After the Surbo was installed, he noted that the knocking noises were gone. The accelerator felt lighter, and he was actually pressing less so the tendency for over-fueling, and therefore knocking, had decreased. Through a corner, he said that the power did not slump as before (reason being that the Surbo charges air when the accelerator is held still). The gearbox would also find a lower ratio more readily when he accelerated while cruising.
A petrol engine knocks when compression is so high that the air fuel mixture ignites by itself before the spark occurs. The result is a flame front coming down at the piston that is still on its way up, and this causes noise and power loss, and even damage to the cylinders. When is knocking (otherwise known as pinking or detonation) likely to occur, and what can you do?
1. When too low an octane is used. Normally, petrol with octane number (RON) that is too low can't be used in high compression engines, because the petrol under pressure can ignite itself prematurely. However, if you use a Surbo, you can use petrol with a lower octane than recommended by the car manufacturer, because the accelerator is often pressed less, resulting in less fuel injected, so the chance of knocking is reduced.
2. When some fuel additives are used. These may make the fuel too easy to burn and so knocking occurs, audibly as a "clack clack" sound. If you use a Surbo, this may be less likely, because the accelerator will not have to be pressed as much for the same acceleration. If the purpose of using the additive is to save fuel, then it may not be required as the Surbo saves at least 10% fuel.
3. When too high a gear is used and the engine cannot turn fast enough, and the accelerator depressed too much in an effort to move the vehicle. As a result, the fuel that is injected is excessive and can cause knocking. For example, in second gear at a low rpm, it is often difficult or even impossible to shift down to first gear, acceleration is poor and overfueling and knocking can occur easily. If a Surbo is used, the air intake pressure is raised, and low rpm torque significantly increased, so the tendency for knocking is reduced. For automatic tranmissions, in such instances the gearbox is more able to kick down to first gear with slightly added pressure on the accelerator, which sends more of the Surbo's pressured air into the engine, allowing for higher rpm required for a lower gear.
4. Whenever the accelerator is pressed too much. With a Surbo, the driver may never have to floor the accelerator, because the Surbo sends the engine to its rpm limit with just 1/2 accelerator pressure. The engine with Surbo does not have to work as hard as before, as it is aided by the air pressure from the Surbo. The increased torque means that the accelerator does not have to be pressed as much as before, so the fuel injected and heat created in the engine is less, and the likelihood of engine knocking is reduced.
10% fuel saving with mixed driving and more on highways
Faster acceleration, especially from standstill for automatic cars
Higher top speed, which means easier cruising
Higher RPM capability, rev limit possible with just 1/2 throttle!
Instant automatic gear kickdown
Safer, more confident overtaking
Better hill climbing power
Less diesel smoke, even with more speed
Reduced CO2 emissions from vehicles
Money saved, more than from fuel savings
Transferability. Use your Surbo on your next car
Lifetime warranty on both the Surbo and installation
How Surbo works
What is Surbo?
The Twin Surbo, 2 Surbos in series for even more low rpm torque
Surbo versus other engine accessories and parts
When the Surbo is most useful
Dynamometer Test Results
How Surbo increases engine compression at low rpm and prevents excessive compression at high rpm
How Surbo increases engine efficiency
How Surbo prevents harmful engine knocking
How Surbo may help your engine so it can last longer
FAQ: Frequently asked questions
How Surbo works for diesel engines
How Surbo's increased air density enhances diesel technology, and raises peak RPM
Diagram: Surbo's effect on the whole vehicle
Diagram: Surbo on petrol turbocharged engines
Diagram: Surbo on diesel engines
Diagram: Surbo on turbo diesel engines
Some vehicles recommended for Surbo
Automatic cars fitted with Surbo
Manual cars fitted with Surbo
Surbo5 for larger engines
Petrol turbo cars fitted with Surbo
Petrol CVT cars fitted with Surbo
Petrol hybrid cars fitted with Surbo
Petrol supercharged cars fitted with Surbo
Natural gas car fitted with Surbo
Diesel and turbodiesel vehicles fitted with Surbo
Motorcycles fitted with Surbo
Photos of Surbos installed in various cars
Why choose Surbo?
Surbo will pass vehicle inspections due to lower emissions
30 day money back guarantee
What happens during the Surbo installation
List of Surbo dealers by country
Buy Surbo online with installation guide, if there's no dealer near you
Join us as dealer for your area
Surbo on racing gokart
Surbo on Honda Civic (runner up in Singapore race)
Surbo wins India race
History of the Surbo company
How the Surbo came to be
Aftersales service and advice, on accessories or compatible vehicles
User guide for Surbo
Automotive engineering and other applications of Surbo