7-13 counts of knock and timing still advances

[Ryan H]

Now I seem to have tuned the knock out, but still it will come back depending on conditions, but I noticed that if I get knock, say 7-10 or so counts my timing still advances or at the very least holds. Now as far as I know timing should be retard once you hit 7 counts, whats the deal with this? I'm not worrying about anything,just curious.

As well while on the topic is it bad to have too much timing advance, I know too much is bad, but say that I'm getting as much as 25-26 timing advance, averages 22 tho as well as no more than 6-7 counts of knock, usually 0 knock.

...just curious..

 

[kpt4321]

You cannot really have too much advance, but beyond a certain point (~24 degrees) you will not such as high gains for increased advance.


....Kyle T.

 

[loreak]

well a low inj DC will make the ecu advance timing more then it should, thats what people with big injectors have problems with, as well as only being able to go 50% on the afc.

you only have 550's though i wouldnt think it would be a problem, on my 660's ive had it go as high as 29 degrees under WOT and even with like 20 counts of knock i was at 20 degrees, i read into it cuz i didnt understand why it was doing that. mine seems to be normal tho, im running richer then i was when i did that logging

 

[nowayout]

big injector will cuase timing to advance or be highe than smaller injectors.

here is my log with 780cc at 18 psi of boost on a 60-1S trim
RPM Knock Timing O2 Inj P/W TPS
4156 0 28 0.84 8.462 80
4250 0 27 0.84 10 86
4312 7 24 0.84 12.051 88
4438 13 18 0.86 14.103 91
4500 12 17 0.88 14.615 92
4594 12 17 0.88 14.872 92
4625 12 17 0.88 14.872 92
4688 11 18 0.88 14.615 92
4750 11 18 0.88 14.872 92
4844 11 18 0.88 14.872 92
4938 11 18 0.88 14.872 92
4969 11 18 0.88 14.872 92
4969 10 18 0.88 14.872 92
5188 10 18 0.88 14.872 92
5156 10 18 0.88 14.872 92
5188 11 19 0.88 15.128 92
5281 10 19 0.88 15.128 92
5219 10 18 0.88 15.385 92
5469 10 19 0.88 15.641 93
5531 10 19 0.88 15.641 93
5438 10 20 0.88 15.641 93
5656 9 22 0.88 15.641 93
5594 9 21 0.88 15.897 93
5656 9 21 0.88 15.897 93
5719 10 21 0.88 15.641 93
5812 10 21 0.88 15.897 93
5688 9 23 0.88 15.897 93
5781 9 23 0.88 15.641 93
5969 9 23 0.88 15.641 93
5938 9 24 0.88 15.385 93
6000 9 24 0.88 15.641 93
5969 8 25 0.86 15.385 93
5969 8 25 0.88 15.385 93
6125 8 23 0.86 15.385 93
6094 8 24 0.86 15.128 93
6094 9 24 0.86 15.128 93
6156 9 23 0.86 14.872 94
6281 8 23 0.86 14.872 94
6406 8 23 0.86 14.615 94
6375 8 24 0.86 14.615 94
6438 8 23 0.86 14.103 94
6375 8 23 0.86 14.359 94
6594 7 24 0.86 14.103 94
6594 7 21 0.86 13.846 94
6594 7 23 0.86 13.846 95
6719 7 23 0.86 13.846 95
6625 7 21 0.86 13.59 95
6781 6 22 0.86 13.59 96
6938 6 24 0.86 13.59 96
6844 6 22 0.86 13.59 96
6750 6 21 0.86 13.333 96
7125 6 21 0.86 13.333 96
6844 5 22 0.86 13.333 96
7000 5 21 0.86 13.077 96
6969 5 21 0.86 13.077 96
7094 5 21 0.86 13.077 96
7062 5 21 0.86 12.821 96

 

[blkreaper]

Here's some tips on advanced timing http://howto.henryvo.com/timing.html. It's for a celica but it should apply here also.

 

[MNGSX]

Using the biggest injectors you can get away with helps.

Fuel goes in at a higher rate. Even if you are using the same amount of fuel it goes in in less time. So more fuel goes in when intake flow is highest and it has more time to atomize and get dispersed around the combustion chamber which is why it can tolerate more timing at the same AFR.

You want as much advance as possible but there is a point of diminishing returns where you don't make any more power if you advance it more. This is also dependant on the initial timing.

Usually its between 30 and 40 BTDC. Total timing. So about 24-20 degrees of advance thru the ECU is pretty much the max range where going past it wont get you anything even if it doesn't knock.