CVT Knock count enquiry

[Markusc]

Hey guys,

I know several members of the forum have posted about "Knock count" and the little importance it does have when monitoring the health of your tune, however recently I've had a large increase in the actual knock count numbers and I was hoping Ktuner could give some details around it in a public forums so others can benefit from it.

I'm using the base map 16/21psi tune and have been for months. Thoroughly enjoying the tune.

My usual mountain run I might see the knock count to tally around 3-5 times however my most recent two trips Ive tallied up to 20 in a matter of minutes.

Below I'll list some details about the scenarios to maybe help diagnose.

Outside temp: 34 °C
IAT 2 temp: 43-46°C
Knock control: Consistent at 0.49. occasionally rising to 0.53
The car also has a solid transmission mount

This is probably the hottest my car has been running ever due to a heat wave we've experienced this weekend.

Essentially my questions to Ktuner are:
1. What EXACTLY is the knock count measuring? Is there a sensor it's recording?
2. Does a large number of knock counts come as a concern when it's never been before?
3. Would having A/C on or having a solid transmission mount be putting strain on the engine and therefore causing this to occur?

I unfortunately didn't get a log otherwise I would have emailed through, I'm hoping to just get more context on whether "knock count" should ever even be considered for the health of the car?

@KTuner

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[kytos]

IAT past 40ºC can lead to knock more easily although you should look at knock control value, if it doesn't skyrocket from 0.49 to 0.8 in one step it's probably fine.

 

[KTuner]

Knock control is what to watch on this platform and your range is good.

 

[dc2turbo]

if you are worried about the knock control going up. You can retard the timing a little as it gets hotter. something like this

 

[kytos]

if you are worried about the knock control going up. You can retard the timing a little as it gets hotter. something like this

I don't have those options lol

 

[gtman]

I don't have those options lol

That's odd. I wouldn't suspect that IAT corrections (lack of) would vary from ECU to ECU.

 

[Markusc]

Knock control is what to watch on this platform and your range is good.

Thanks for the peace of mind

Are you able to comment on the knock count at all? It seems odd that it shot up into the 20s.

Would you have any speculation as to how/why this would occur? And what exactly is the knock count "counting"?
(I like to know context behind why these things are the way they are)

 

[KTuner]

Knock count is not a useful indicator unless they're climbing by hundreds. Think of how many ignition events occur per minute at any given RPM.

 

[KTuner]

Any ECU that was added for initial support will get additional items as updates are released!

 

[kytos]

Any ECU that was added for initial support will get additional items as updates are released!

Thank you, I think it would be great to have a list of all supported ecus and the current level of feature support that each ECU model has.

 

[MrMonkey]

I hear that Ktuner has a lot of good tuning options for us cvt owners. Confirm? Does Ktuner have a carb legal tune available?

 

[gtman]

I hear that Ktuner has a lot of good tuning options for us cvt owners. Confirm? Does Ktuner have a carb legal tune available?

Ktuner is fantastic with the CVT in terms of drivability upgrades. I had a CARB Flashpro and Ktuner has many more features. But, at this time there is no CARB legal Ktuner available.

 

[Markusc]

Knock count is not a useful indicator unless they're climbing by hundreds. Think of how many ignition events occur per minute at any given RPM.

Ahh thank you! Basically I was saying I had no idea what it meant. But now that you've mentioned that I assume the count is literally 1 revolution out of thousands per minute. That clears things up thanks Ktuner

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