this was what i was told by a friend. just that they are controlled to a minimum so we don't actually feel it. is this true?

edit/ from what i understand the engine management operates at conservative levels so there isn't actually any knocking... hmm...

I can't imagine that being the case. Otherwise engines wouldn't last very long at all.

ever used a tuning scope or microphone? last time i was tuning a mates RB we did a before mods tune to make sure everything was in tip top shape and it was pinging slightly from what i could hear. my motor does the same thing mildly but because its down low in the rpm and VERY mild knocking its actualy safe. i dont think EVERY motor does it, but 2 of the few ive tuned do it, mainly because they run alot of timing out of the power range to get econemy out of them and lean ratios.

definatly not audible to the ear without tuning tools and knock sensors tho! if it was then yes it would be rat**** in a few years.

I am using software on a TR that can read information from the ECU.

The ECU counts the number of knocks and responds accordingly

The knock sum scale is given to represent the signal from the knock sensor to the ECU. The ECU then calculates the amount of detonation present. The higher the knock sum the more the ECU retards timing to get rid of the knock.
With a knock sum of:
3 or below, the ECU will advance timing.
Between 3 and 7, the ECU leaves timing alone.
Higher than 7, the ECU will begin retarding timing. Higher knock = higher retard, with the possiblity of seeing less than 4deg total advance at the maximum knock sum of 43.
One important note to remember is the knock sensor can detect "false" knock and retard timing. This is most commonly caused from the noisy lifters but anything it can audibly pick up could cause this.

From the last log on done on my ECU during a 1 hour drive there was probably 10-15 times when the ECU recorded the engine knocking

yea what gst74 said was basically what my friend said. maybe every engine does knock, only it is minimised by the ecu's ignition timing to a point where we cannot feel them nor will it be significant enough to affect the engine's lifespan.

I am using software on a TR that can read information from the ECU.

The ECU counts the number of knocks and responds accordingly

The knock sum scale is given to represent the signal from the knock sensor to the ECU. The ECU then calculates the amount of detonation present. The higher the knock sum the more the ECU retards timing to get rid of the knock.
With a knock sum of:
3 or below, the ECU will advance timing.
Between 3 and 7, the ECU leaves timing alone.
Higher than 7, the ECU will begin retarding timing. Higher knock = higher retard, with the possiblity of seeing less than 4deg total advance at the maximum knock sum of 43.
One important note to remember is the knock sensor can detect "false" knock and retard timing. This is most commonly caused from the noisy lifters but anything it can audibly pick up could cause this.

From the last log on done on my ECU during a 1 hour drive there was probably 10-15 times when the ECU recorded the engine knocking

This wouldn't have anything to do with the **** idle that the AstronII has, would it?
Does the 3.0l (tr-ts) have knock sensors also, or not?

This wouldn't have anything to do with the **** idle that the AstronII has, would it?
Does the 3.0l (tr-ts) have knock sensors also, or not?


I wouldn't think so. On what I have seen at idle there is no knocking happening as the timing is not that advanced. The knocking that I have seen has been when the timing has advanced up around 50-55deg btdc.

Rough idle problems are more likely to be ignition components, dirty injectors or vacuum leaks.

No idea if the 6cyl has a knock sensor but i imagine that it would.

Just have a listen to nearly all small japanese 4 cylinders pull up a hill at low speeds, they nearly all ping their rings off. I dare say it's cause our fuel is 4 or 5 points lower on the RON scale and they dont retard the engines enough when they release them in aus.

Matthius

Which cyclinder/s were pinging? Reckon it's due to the manifold/plenum design with the TB end-mounted?