ATH

stethoscopes, like Dustin was using in my car this weekend.

<a href="http://www.autospeed.com/cms/article.html?&A=0353">How to build one</a>

<a href="http://home.netcom.com/~bsundahl/knock/sound/KnockSounds.htm">How to analyze the sounds</a> Listen to the sound clips here too

However, I don't see how it would be easy to slign a spectrogram with a CF and KV log in ECUx - I guess with someone else in the car operating both you could start recording at the exact same time...

This could be an interesting project, since some people see high KV's and low CF's, and other people have the opposite, so we might be able to figure out when knock is truly occuring (and hopefully that it's not).

Imolavirus@BuehnEngineering

what sensors are used when running something like standalone?

ATH

<ul><li><a href="http://www.jandssafeguard.com/">http://www.jandssafeguard.com/</a</li></ul>

ATH

<center><img src="http://www.jandssafeguard.com/images/Dyno2W.jpg"></center><p>

Imolavirus@BuehnEngineering

them.

Imolavirus@BuehnEngineering

that looks fun

ATH

It would be nice to find out where specifically CF's come from - if the ECU is always correct, then I suppose we could ignore KV's and just look at CF's, right?

Woland

of the detonation shock wave which you can get from digikey.com The resonant frequency depends mostly on the cylinder bore and in the 2.7T it is around 16kHz. You can do as easy as take a laptop and have a mic with a long extension and just tape it close to the engine and then do a fourier transformation on the data and try and find something around the 16kHz and its harmonics. People in the old days used to do it with a stethoscope kind of thingy that was screwed to the block, but you need a trained ear for that. Knock sensors are basically narrowband microphones that are sensitive to a particular frequency range only.

BillS4

In my supra I run the AEM EMS. It uses the two OEM knock sensers, a GM Intake Air Temp, and a Kelico 3.5 bar map senser along with an FJO wideband O2 senser. The AEM datalogs everything you could imagine and also gives you total control over every feature of your car. It's not plug and play and requires a learning curve, but having one is very helpful. For instance, I have my meth injection wired into the AEM so that at 16 psi I start spraying. AEM also has full NOS control, two step, and traction control. All nice extras. If they every make a plateform for the Audi I would be all over it.

Captain Matt, I be

it'd be a lot easier to compare the results to a KV or CF log from a controlled environment.