Here is log made from about 3400 to 5400 with lots of knock first column is octane second is knock third is timing. Timing started at 9 and should have gone to 8 then to 9 again by the end of this run. Timing was pulled by 15 degrees at 1 point. This all took place in 5.1 seconds.


100 0 8
100 7 4
100 20 0
100 27 -3
100 36 -6
99.60784314 36 -6
99.60784314 36 -6
99.60784314 35 -5
99.60784314 35 -5
99.60784314 35 -5
99.60784314 35 -5
99.60784314 35 -5
99.21568627 35 -5
99.21568627 36 -7
99.21568627 36 -7
99.21568627 36 -7
99.21568627 35 -7
99.21568627 35 -7
98.82352941 35 -7
98.82352941 35 -7
98.82352941 35 -7
98.82352941 35 -7
98.82352941 35 -7
98.82352941 35 -7
98.82352941 34 -6
98.43137255 34 -6
98.43137255 34 -6
98.43137255 34 -6
98.43137255 34 -6
98.43137255 34 -6
98.43137255 34 -6
98.03921569 34 -6
98.03921569 34 -6
98.03921569 33 -6
98.03921569 33 -6
98.03921569 33 -6
98.03921569 33 -6
98.03921569 33 -6
97.64705882 33 -5
97.64705882 33 -5
97.64705882 33 -5
97.64705882 33 -5
97.64705882 32 -4
97.64705882 32 -4
97.25490196 32 -4
97.25490196 32 -4
97.25490196 32 -4
97.25490196 32 -4
97.25490196 32 -4
97.25490196 32 -4
97.25490196 32 -4
96.8627451 31 -4
96.8627451 31 -4
96.8627451 31 -4
96.8627451 31 -3
96.8627451 31 -3
96.8627451 31 -3

 

You have to remember that timing is still being pulled due to knock irregardles of the octane number. Think of the octane number like a fuel trim, but only for knock. The octane number is a somewhat long-term learned trim for knock.

Timing will still be pulled, though, even well below your low octane map (as shown in the log above), depending on how much knock you have and your low map numbers. This timing is being pulled by the ECU's knock correction.


Eric

 

Wow, thats alot of knock and hardley any octane # loss. Picture is worth 1000 words as they say. Much clearer now. Can't wait to get excel. I logged my wife's IX today with a mail in flash and got a headache and dizzy. LOL

 

from the looks of that, the octane number had nothing to do with how much timing was pulled, infact it almost seems pointless, but ya thats a ridiculous amount of knock, im just wondering whats the highest knock count somebody has seen?

 

I asume that was your car? Was the engine OK? What happened to cause so much knock, and I would suspect you could hear that much with the naked ear if the stereo was off and your exhaust not too loud. Sorry

 

Some jerkoff turned up my MBC without my knowledge. No I heard nothing, my knock-link did flash briefly and engine is fine. Octane went back to 100 after a few minutes as boost was adjusted back down.

 

36 is the highest knock sum.

It will keep decrementing the octane number on a timer whilst the knock sum is 6 or higher. As said by Eric it is a long term trim and is very effective at what it is designed for. It is not surprising that it comes down slowly during a sudden knocking event, it is programmed to do that.

Note also that the knock sum decrements gradually as well - even after the knocking event has passed. This also makes sense.

 

i am wondering how many tuners keep HI\LO octane maps the same?? I pulled my ecu Rom tonight and found out that they are the same. Going to a bigger turbo setup so will be completely retuned then.

 

Wow. Great info. Guess I can tune a bit closer to the edge than originally expected. What knock link you running? got to get me one of them for sure. I like the TXS but fill me in with more detail bro.

I just talked to a tuner tonight (Clark Turner). He specializes in Subies but tunes lots of evo's. He's good and safe IMHO. Made 348whp/tq on a mustang dyno using Ecutek on a IX with TBE and MBC only. I was impressed. (damn MIVEC) Anyway, he said the evo's basicly ride the knock sensors and remain quite safe compared to others like subies. Although he tunes for 0 knock, If the customer wants it more aggressive, he is not as hesitiant to do so because of the dual safety nets (timing pull, octane #) Basicly said if your going to go aggressive, ignore 1 and 2 counts. (at your own risk ofcourse)

 

From all I've looked at, only one tuner had it like that. Who tuned yours like that?
(Pm is fine if you want to avoid the political BS)

 

http://www.vividracing.com/catalog/p...roducts_id/399

 

Knock link is garbage... Buy mine if you want one. It has absolutely nothing to do with the ECU, knocksums or ECUFlash. It will not help.

 

Oh, I wanted to clarify. My TXS "knock sensor" is built in to the utec using the stock knock sensor so it works great for my rex. But I know they have another, havent researched to see if it has its own sensor or not. With the tuner pro that used its own sensor, it wasn't nearly as reliable. so I just removed it. And I agree, the knock link isn't appropriate for the stock ECU. Agree 100%
This is obvious if your got that much knock and you only saw it flash "briefly". But at least you were logging and saw it on the laptop.

 

Tell us about yours. Can't find it on your website.

 

He meant buy his knock link.