Category Archives: Intake & Exhaust

Intake and exhaust tuning

The best intake, fuelling & exhaust modifications

The engine intake and exhaust are probably the least appreciated engine modifications. We examine the best tuning options to improve your cars fuelling, air intake and exhaust.

We’ll also look at some of the common myths and misunderstood aspects of car intake and exhaust tuning.

[description]Best modifications to improve the intake and exhaust on a high performance engine. The headers and exhaust dimensions are critical to fully reaching the peak power of your engine.[/description][keywords]intake mods, induction kits,air filters,intake upgrades,exhaust mods,sports exhausts,performance intake,performance headers[/keywords]

Benefits and drawbacks of engine water injection systems

You’ve finished tuning up your engine but you find that at full throttle the engine splutters or stalls. When you get the car on a diagnostic you find that the knock sensor is kicking in to protect the engine.

Engine knock is a condition where the fuel inside the engine ignites prematurely and occurs within an engine running at high compression. (It can also be caused by other factors including low octane/poor quality fuel or hot spots within the engine.) Read More...

Big valve kits – larger intake valves.

The heads primary job is the mixing of fuel and air and delivering this to the combustion chamber.

Any turbulence or drag can restrict the air flow into the engine starving you of power. So this TorqueCars article will focus on the intake valves and how they can be improved.

The aim of head tuning is both to maximise the amount of air and fuel that gets into the engine, and to improve the mixture. Read More...

Fuel and fuel additives octane and pressure boost valves.

Choice of fuel becomes more critical in a high compression or turbo engine.

"One of my Pet(rol) hates!"

Fuel: this is regulated by a pressurise valve at the engine end – generally more fuel means more power but you also need more air as well – certainly an induction kit on larger engines and preferably a turbo or supercharger.

If the mixture is too rich a catalyst would be destroyed as unburned fuel enters the catalyst and burns inside it melting the catalytic structure so there is a delicate balance to maintain. … Read More...

Adding NoS nitrous oxide to boost power gains.

Giggle gas – something to put a smile on your face.

"Giggle Gas – Nitrous Oxide (N20) the power button!"

NB: NoS is a brand name of a company but many confuse this with the name of the gas Dinitrous Monoxide AKA – Nitrous Oxide N20, Dinitrous Monoxide, Dinitrogen oxide also referred to as Nitrous or giggle gas (from its medical usage as an anaesthetic.

It was used in wartime to boost the engines in aircraft and later became a big hit in drag racing in the Pro Mod class. Not a flammable gas in itself it is injected into the intake manifold where it mixes with air & fuel.  The main benefit of Nitrous comes as it burns and becomes an oxidiser releasing more oxygen into the engine.… Read More...

What is an induction kit and what does it do.

As induction kits are probably one of the most popular modifications for car tuning projects we thought we should add a introductory article to explain what they are, what they do and the theory behind them.

An induction kit is quite simply an air filter. Most cars have air filters mounted in an air box. These filters are generally constructed of paper which filters out the particles from the air and prevents these from getting into the engine. The airboxes are designed to reduce the noise of the engine and have various vanes and angles cut to maximise this noise reduction. Read More...

Fuelling uprating the fuel pump, injectors and fuel pressure regulator

Fuel systems

"A car with a drink problem!"

Cars need a precise mix of oxygen and fuel to burn effectively. Much of the engine tuning done by TorqueCars members involves increasing the cars capacity to burn the air and fuel mix. Much attention is generally given to the air intake and we have discussed the various aspects of forced induction.

We should not overlook the fuelling as it is essential to keep the mix right. Power is lost when the engine adjusts itself to stop it running too rich or lean. Many power losses at certain points in the rev band can often be traced to a fuelling issue.… Read More...

Particulate filters and FAP Performance gains.

The particulate filter is a stand alone unit. It is located upstream of the cat in the exhaust system and its purpose is to remove soot particles from the gas stream. The cat the proceeds to do its usual job of converting CO to CO2 and is in no way dependent or relied upon by the particulate filter.

In diesels the cats are two way devices and run in unregulated mode (ie. no O2 sensor like a petrol car). Read More...