BoostGuy951

What is the output of the Knock sensor? It is within 0-5v? The Zeitronix has an auxillary input for datalogging, so I was thinking of wiring it in, if its output is between 0-5v and it would be able to be interpreted.

special tool

Dude - start nagging you-know-who. I have been on him for a while to make 0-5, or even 0-1 (for the lambda input) out of that sensor. Help me out.

B951S

According to the AEM stuff I was toying with, the knock volts were a range between 0-5v. Not sure if this is the raw voltage or after filtering / conditioning, but the software graphed kock volts in this range.

Claus Groth

I tried it with the Zeitronix datalogger and got just 0.2 volts when banging on the block next tot he sensor. I now have a toggle switch on the dashboard to switch between fuel computer output to DME and a steering wheel mounted pushbutton to provide a spike (ie: at the start/finish line and another marker) so that I can relate data logging to particular parts of the racetrack.

I use Knocksense for knock monitoring but can't log it.

BoostGuy951

I'm sorry I didnt really follow this. Are you getting .2 volts when you knock on the block and then 0.0 volts otherwise?

I've got a knock display, but I also wanted to be able to datalog.

hosrom_951

Claus: Did you have any logs on the knock sensor from Zeitronix but on various boost levels? maybe that would show some difference.

TurboCab

You have to be carefull with the type of nock sensor you are using. There are two type of sensors, the Broadband Resonant type and the Flat Response Type.
In summary the Broadband Resonant produce a higher output voltage that can reach up to 2 volts but it is tuned for a narrow frequency range. The Flat Response type produce a very low output voltage up to 30mV but it is tuned for a more large frequency range. In my opinion the knock sensor used for the 944 and 968 series is of the Flat Response type. When I installed my Tec 3 in my 968 Turbo conversion, one of the knock sensors was replaced by the type supplied by electromotive for correct operation. Check the logger owners manual or contact them to see what type of knock sensor has to be used. Hope this help.

Dark Lightning

Does it seem accurate and useful?

theedge

That could be datalogged using an input on almost anything (Zeitronix, etc).

Edit: And that looks like a sweet little device. What do you think of it so far?

BoostGuy951

Yeah, but the question is are you gonna be able to interpret it.

theedge

Well it seems the intensity of the flashing indicates knocking, so it would be similar on the line graph. Best way would be to have the light hooked up at the same time.

BoostGuy951

Yeah. I intend to give it a shot. I will report back as soon as I have a datalog with it as a variable. (which should be a while)

NZ951

Why not just log on the Link?

hosrom_951

Instead of see's lights (knock block) or listening to knock, i'd rather see a curve (plot) against rpms and boost.......

mark944turbo

Do a search! Im still working on a device that recognizes a filtered knock, but have been delayed due to running issues. Hopefully by spring I will get my shi@ together.