Why choose Surbo? With and without Surbo Achieve red line by 1/2 throttle for manuals, and higher revs than usual for autos! What is Surbo? Surbo price in Singapore

How to calculate tyre size

How would you know if your tyre size is speedometer correct? That is to say, is the rolling diameter correct?

If the original tyre rating (found on the door sticker) is 195/65/R15, then its rolling diameter is 15 x 25.4mm plus 2 x 195mm x 65/100, which is 634.5mm.

If the current tyre rating (found on the tyres) is 225/45/R17, then its rolling diameter is 17 x 25.4mm plus 2 x 225mm x 45/100, which is 634.3mm.

The ratio of the latter over the former is 0.99968, meaning it is speedometer correct. Most importantly, it will not represent an increased load to the engine, other than any weight differences. Oversizing of tyres can affect performance, with top speed dropping by as much as 30 kph for 3 percent oversizing. Cruising is affected, and fuel consumption goes up.

The Surbo works on half throttle to generate a back air pressure wave for jetting and vortex formation, which results in max engine rpm with half throttle. If the engine is overloaded with tyres with excessive rolling diameter, half throttle activation of the Surbo is not possible. Therefore, if your tyres are oversized, you might make it speedometer correct first before Surbo installation. When choosing tyres, use our formula to calculate the rolling diameter.

It is ok to go lower than the recommended tyre size, such as to 98% especially when much larger and heavier wheels are used, provided comfort is not compromised. This is also useful if your car is worn and has lost some power, or it has the smallest engine in its range, or if you have some modifications that have taken away the low rpm power and fuel economy.

Standard tyre sizes from door sticker of some cars in Singapore

175/65R14 Toyota Vios 2006, Honda Jazz 2006, Daihatsu Sirion 1.3 2006.

165/65R13 Chery QQ 0.8 semi auto

185/55R15 Mitsubishi Colt Plus Turbo

185/65R15 Nissan Sunny 2008, Hyundai Avante 1.6

195/50R15 Proton Saga BLM 1.3

195/55R15 Chevrolet Optra 1.6

195/60R15 Mitsubishi Lancer CS3, Subaru Impreza TS 1.6,

195/65R15 Fiat Bravo Tjet 1.4, Mazda 3, Subaru Impreza 1.5 2008, Toyota Wish 2010 and Altis 2008, Honda Accord 2007,

205/65R15 Honda Stream 1.8 2007, Renault Fluence, Hyundai i40 1.7 turbodiesel

205/55R16 Honda Civic 2006 1.6, Subaru Impreza RS 2.0, Mazda 3 2010,

205/60R16 Chevrolet Cruze 1.6 2011, Mitsubishi Lancer 1.5 EX 2007, Toyota Picnic 2006 2.0,

215/60R16 Subaru Forester, Toyota Wish 2009

235/60R16 Chery T11 2.0

215/55R17 Honda Oddysey 2.4 RB2

225/65R17 Toyota Harrier 2.4 2007, Honda CRV 2.0 2007

235/60R17 Chevrolet Captiva 2.4

245/45R17 Mercedes E200 2007

245/40R18 Audi TT 2.0

It's still best to take the tyre information from the sticker around your own car door if it is still there. This list will be expanded.

How Surbo transforms your car:

Benefits using Surbo

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

Technical Details

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

Vehicles using Surbo

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

Surbo sales

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 racing

Surbo on racing gokart

Surbo on Honda Civic (runner up in Singapore race)

Surbo wins India race

About Us

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

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