Cylinder pressure is overkill. Use acoustic, or crank angle. Plug reading and individual egt sensors are a good method as well.

 

None of those can directly measure preignition, in all those cases, assumptions are made then interpreted to get to what you are looking for. Think of it like when you were a kid and one person starts with a statement and tells it to the next, then they pass it on. By the time it gets to the end its either completely different or changed.

 

I agree it's not direct, but if you know how to use the tools correctly it's 100% reliable.

 

MoTeC has a new knock detection system. They will only sell it through certain tuners and the estimated dyno time to set it up is in excess of 8 hours.

 

HMM, I would love to find more on this, I think this is the first gas engine with pressure sensors in production. Audi and Volkswagen are using them in their Diesel engines but they have justified the cost to reduced need for urea and other emissions devices.

I have read several articles on in cylinder pressure monitoring and my favorite quote was from an executive of on the major auto manufactures that referred to the technology as the

 

I read this a while back and it is no different that what Honda uses, unfortunately it is not very sophisticated. I would be happy just to have something similar to the systems used in Subaru's, Dodge, Audi............ I have a feeling with Turbo's becoming standard we will keep seeing more of these advances trickle down from the OEM

 

It's the same technology as the common knock sensor but the implementation is far in excess of the stock sensor. Of course so is the cost to purchase and tune it.

You probably know this already but the stock sensor is useless in an FI environment. 95% of "pings" will be false positives.

 

WOW, I bet this is what people used to say about stand-alone ECU's too. People would say, why when a piggy back or just a rising rate FPR is good enough.

Trust me my friend. This is the future. You will look back and laugh at the fact you used to use EGT's and just one knock sensor to monitor all cylinders.

AEM or some main stream company will come out with this technology and its going to change the scene. Suddenly numbers that before people would call " " on will be reality. Imagine a constantly varrying ignition curve. Our fuel curves are this way, isn't then intuitive that the ignition curve should be also for the changing conditions through the rpm band?

Just my thoughts.....

J. R.

 

[QUOTE=dsddcd,May 13 2009, 01:44 PM] HMM, I would love to find more on this, I think this is the first gas engine with pressure sensors in production. Audi and Volkswagen are using them in their Diesel engines but they have justified the cost to reduced need for urea and other emissions devices.

I have read several articles on in cylinder pressure monitoring and my favorite quote was from an executive of on the major auto manufactures that referred to the technology as the

 

Easy. I didn't say it was junk, and by acoustic I didn't mean the useless knock sensor.