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TurboXS KnockLite
TurboXS KnockLite


 
MSRP $129.00
Our Price: $116.10
Savings: $12.90

Availability: Currently Unavailable
Product Code: GSX-TXSKNOCK
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Description
 
As any tuner knows, the demise of numerous engines, particularly highly tuned, forced induction engines has been attributed to engine knock. Even though highly tuned forced induction engines are at most risk, engine knock is a condition that should be avoided for all engines.

What Exactly is Knock? - The semantics of knock, pre-ignition, or detonation can be argued among automotive engineers, however it is basically an uncontrolled ignition of the air fuel mixture. The uncontrolled part means that it doesnメt occur at the desired time in the combustion cycle. Normally the timing of the ignition is designed to maximise pressure in the cylinder so that it will push the piston down with the most force. Knock can cause high cylinder pressures at times when it actually counteracts the force and also cause shockwaves within the cylinder. It is the shockwave that emits the characteristic "tinkling" sound you often hear when the engine is knocking. In reality by the time you hear knock the chances are that the engine has been knocking for a while. Car manufacturers are continuously researching better ways of detecting knock and in the future we may see more direct methods such as pressure sensors and ionised current measuring however the majority of cars still use an indirect method of detecting knock by listening to the ringing sound of the cylinder using a piezoelectric knock sensor.

KnockLite Development - TurboXS has developed a series of engine management computers called the UTEC, which supplement the factory ECU. The WRX, STi and EVO UTECメs all have a knock detection circuit and software which provides active knock control when knock is detected plus a visual warning of knock to the driver. It has been a favoured feature of the UTEC and TurboXS has received numerous positive comments about it. The KnockLite evolved from the knock detection work that was done on the UTECメs with the aim to provide the same functions but in a smaller and more universal package. The KnockLite is also a standard item supplied with the TurboXS DTEC range of Fuel and Boost computers. TurboXS tested various knock detection units on the market and it found that many units only had one level of sensitivity regardless of RPM. This could easily give the false impression of no knock at low RPM.

How the KnockLite Detects Knock - The task of detecting knock is to detect the characteristic sounds of knock above the background engine noise. By filtering out the engine noise, it allows the detection of knock at the earliest stage possible. The task of filtering out the noise is no simple task as the level of engine noise changes with RPM. Thus for a knock detection system it is important to be able to vary the sensitivity over RPM. If you only have one setting then the knock detection will be sensitive to knock at high engine noise (high rpm) but there will be a reduced sensitivity at low RPM.

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