Setting up the vi-pec digital knock box..

[Guest |229|]

Hi.

I have a Rb30DET. (3.0 liter and inline 6). Does anyone know the freq to use? its ~500cc pr. cylender, and is mid 90' design, so should i just use the manuals settting for that? (Start of 90's are one setting while end of 90's are another, mine is in the middle.....) Or is there anything special about this engine? I would rather avoid to use the method of detecting this by recording knock on the engine.

thank you.

[rayhall]

This is from the knock amplifer manual. http://www.vi-pec.com/techdata/VipecDigitalKnockAmplifier.pdf There is a lot more information as well on the setup.

Calculation Technique:

The knock frequency can be estimated by calculation. There are other factors affecting the

knock frequency but this equation provides a general guide:

Knock Resonant Frequency kHz = 1800 / (3.14 * piston diameter mm)

Avoid using this equation on late model cars, as they often have 2nd harmonic tuned knock

sensors.

To find the 2nd harmonic, use the following equation:

2nd Harmonic Knock Resonant Frequency kHz = 3600 / (3.14 * piston diameter mm)

It is recommended that the calculated frequency is checked using the measurement

technique.

General rules can be used to assist filter selection:

6kHz Narrow Band Filter works on most early 90's Japanese manufactured engines with

approximately 500cc per cylinder.

[Guest |229|]

i have read this, but was just wondering if there is something special to my engine, as its middle in 90's.

My plan was to use the 6khz narrow band.

How do i dint out is my knock sensor is a 2nd harmonic or not. its a nissan engine from the middle 90's.

[Guest Hic]

There is nothing special to your engine.

Just use 6kHz and try to listen the engine.

Your knock sensor is not 2nd harmonic, just plain knock sensor, as I am aware.

[Guest |229|]

Thank you, that was all i wanted to hear...

Thanks