Lead your diesel engine with air, not fuel!
A diesel engine's fuel feed is proportional to how much the accelerator is pressed, because the fuel governer is directly controlled by the accelerator. So, a diesel engine is fuel-led. We must ensure that there is enough air to meet any diesel injected. (this is unlike a petrol engine, which is air-led, and has fuel injected depending on how much air is measured as it goes into the engine, using the air flow meter, or manifold absolute pressure sensor).
In a normal diesel engine, air flow is fixed at idle, with some spare air to allow for additional fuel for acceleration without smoke. The excess air is limited, and to prevent or lessen smoke, a mechanical stop on the accelerator may be used, to limit accelerator travel. Or, sensors may be used to calculate the maximum fuel permissible to prevent smoke, but this can result in serious curtailing of engine power. It's probably better to provide more headroom by making more air go into the engine.
A normal diesel engine smokes, indicating that for that particular level of acceleration required, there is not enough air to fire with the fuel at the same time. All the oxygen that is available or can be found in time by the fuel is already used up and that is the natural limit for power. Therefore it is imperative to provide greater air headroom and air flow scaleability to always keep ahead of diesel fuel injection. That is, to let air supply lead fuel supply, like in a petrol engine. But is this possible?
Even if the diesel engine is turbocharged, for sudden acceleration or before the turbo is on, the engine can still smoke. The problem gets worse if there are leaks in the pipes connecting the turbo, intercooler and engine.
A paradigm shift
With Surbo, this air headroom is increased, shown by a higher idling rpm. This reflects the Surbo's higher air compression and efficiency. With more air flowing through the engine, with some accumulated in the oil chamber which is part of the Surbo system, more fuel can be put in to accelerate harder and to a higher rpm without smoking. Once the accelerator is slightly released and the Surbo is back pressed to generate compressive air jets, less work is required from the engine, which can continue to accelerate without smoke. Therefore, in a Surbo-powered diesel vehicle, the engine is no more entirely fuel-led, but running lean with higher compression due to increased air flow. So, the performance gets a whole lot better.
Even in the case of a leaking turbo pipe, the Surbo can make a difference because the air taken into the engine is above normal intake pressure (reflected by the higher idle rpm). This was the case for a Surbo-equipped Mercedes vito 111, which showed even more power after the turbo pipe was changed. Having all engine-connected air pipes, including the turbo ones, airtight, improves the back pressure required for Surbo charging.
Owners can have the pipes checked first, or come for Surbo installation first, and with our experience we will be able to tell you if your turbodiesel vehicle is in tip top condition.
- Diesel & turbodiesel vehicle list
- Related: diesel smoke reduction
How Surbo works for diesel vehicles
- Surbo system's energy analysis for diesel engines
- Surbo system's energy analysis for turbo diesel engines
How Surbo transforms your car:
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
User testimonials (with original source):
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