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Do you have the ability to measure the frequency off the sensor in realtime? If not, I'd stick with the stock resonant sensor, else finding the knock frequency is going to be a fun time. Look at the response of the plots posted already, the resonant type gives 66 times more signal at ~6K than the wideband. If 6K is the knock frequency, that's the one you want.
Haltech will let me log all frequencies off the sensor in realtime via a scope, while adding a button to temporally advance into knock, hopefully. With a wideband knock sensor I'd be able to set it's filter frequency higher or lower than 6K if needed. If it were 6K, I'd probably switch back to the resonant type, because it naturally filters noise a hell of a lot better.
That's how I use the sensor with my 1500. You can find the base frequency with a formula (https://phormula.com/knock-frequency-calculator), but I have heard you may want to monitor the second order frequency.
I was pulling my original info from an m.net thread circa ~2004 so can't comment on the validity there. Guess someone could hook a stock sensor up to an oscope or datalogger to find out. Delphi definitely makes both varieties.
Either way my money is on the bosch motorsports sensor having better bandwidth, linearity, stability, and environmental ratings than the mazda/saturn delphi sensor. Like socals/deezums said, haltech makes it pretty easy with the elite 1500/2500 to play with settings using a real-time spectrogram readout
I had 50 made, so I made more than enough. The bosch knock sensor has a height of 18mm, so this leave perfectly (with a little space left over) for a nut. Please send me a PM if you're still interested. As i'll be out of town until Tuesday, I won't start shipping until Wednesday. I still need to figure out the cheapest way to ship an item as i've never done so before.
If USPS is competitive with UPS and FedEx, I like PirateShip.com for the commercial discounts (it's free). Not that it matters here, but they also insure with ShipSurance for bigger stuff and I had no problem with a >$1k claim.
Excuse my ignorance, but I have a 99 NB. Would using a Bosch knock sensor work with an MS3 Pro PNP, or is the knock detection software not up to the task on that ecu?
08-23-2021, 12:22 PM
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