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.
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.
The KnockLite system connects to a broadband frequency knock sensor such as a Bosch knock sensor, but it can also be connected to a suitable factory sensor. Likes Received: 23 Trophy Points: Likes Received: 38 Trophy Points: PMed ya. SubieDave , Feb 11, Josh, could I bother you to get a pictur thru or into the muffler on the Megan Black? That's still too awesome a deal to pass up.
Also, the piping diameter as well please. Shibbs , Feb 11, ImportImage , Feb 12, ImportImage , Feb 13, ImportImage , Feb 17, Likes Received: 0 Trophy Points: ImportImage , Feb 20, Hello, its Saturday! Check out the new Subaru Turbochargers section! More turbo kits, more suby goodies added! ImportImage , Feb 23, Hello, its Tuesday morning! ImportImage , Feb 26, I can has muchos bumping of all of my threads too!? ImportImage , Feb 28, ImportImage , Mar 3, Hmm looking I used a TurboXS knocklite, with a Bosch wideband knock sensor.
Joined Jul 9, Messages Location Indiana. Double Post. Last edited: Aug 21, Thats pretty sweet. I will be waiting on your updates. Im interested to see how much knock you encounter. Very good info. Ashley This is a pretty cool project. I guess actually testing it would be hazardous to your Cobra engine. Is there any way to confirm that it works? This sould have been a "no brainer" for Ford since they had one on the Mustang GT.
I think they were having problems with the sensativity of the knock sensor they were using. All the noise the valve gear and the blower make was overwelming the system.
The ultimate set-up would be to have it retard your timing. Parhaps your tuner can plumb the signal in to your ECU to accomplish this. Avoid handling the KnockLite in areas that have floor or work-surface covering capable of generating a static charge. The KnockLite is designed to be mounted in clear view of the driver. The KnockLite should be positioned so that it does not obstruct vision to the road or to instruments, but be clearly visible with your peripheral vision.
Use the adhesive Velcro tape to mount the KnockLite to your chosen location. KnockLite Setup Before using your KnockLite, the wiring must be completed and the following parameters must be setup for your vehicle. To minimize this risk, ensure that your engine is at operating temp and in good running order. Do not adjust the KnockLite whilst driving. Have a passenger assist in programming or bring the vehicle safely to a standstill before adjusting the KnockLite.
The ability of the KnockLit to detect knock is dependent upon the knock sensor used and the location of the knock sensor. The KnockLite has three programming points for background noise threshold detection. Read the whole procedure before beginning. Start the car and warm the engine up to operating temperature. Entering Programming Mode Press the KnockLite programming button four 4 times in moderately rapid succession.
The LED should flash Red at about a 1 second interval to indicate knock programming mode. If the LED fails to flash red as described, try pressing the programming button 4 times again. Programming Engine Sound Threshold 1 With the car at idle, press the programming button once.
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