I did some logging the other day my 1st pull was in 3rd gear@40ish mph , I only got 1 knock cout@5-6K per evoscan . So iam very happy with my re-tune .

But I did one more log 10 mins after the 1st . It was the same road , mph , tem.... as the 1st log . But this I got 6 count of knock from 3.5-4.5k and then tapered down to 2 couts @7k .

So this is like the 3rd time ive ran into this where the 1st log is great then the 2nd log get knock .

Iam trying to post up the 2 log , lets see if i can swing that

Thanks for any info guys


Iam a computer r-tard , when i try to upload the logs i get "Invalid File " iam looking at it in "excel" right now

 

u had 6 counts of knock consistently in those rpms?

 

Iam still trying here is the 1st log
RPM KnockSum
3031.25 0
3468.75 0
3937.5 0
3906.25 0
3843.75 0
3812.5 0
3812.5 0
3781.25 0
3750 0
3781.25 0
3750 0
3718.75 0
3718.75 0
3687.5 0
3687.5 0
3656.25 0
3656.25 0
3656.25 0
3625 0
3625 0
3625 0
3593.75 0
3656.25 0
3687.5 0
3750 0
3812.5 0
3906.25 0
4062.5 0
4218.75 0
4406.25 0
4625 0
4812.5 0
5000 1
5156.25 1
5312.5 1
5468.75 0
5625 0
5750 0
5937.5 0
6062.5 0
6218.75 0
6312.5 0
6468.75 0
6625 0
6750 0
6875 0
6968.75 0
7062.5 0
7218.75 0
7312.5 0
7437.5 0
6781.25 0
6156.25 0
5625 0
5125 0
4687.5 0
4281.25 0
3875 0
3468.75 0
3093.75 0
2750 0
2406.25 0
2156.25 0
1875 0
1562.5 0

2nd log

3656.25 0
3625 0
3593.75 0
3593.75 0
3625 0
3593.75 0
3593.75 0
3593.75 0
3656.25 2
3625 6
3750 6
3875 6
4000 5
4125 5
4312.5 5
4500 5
4687.5 5
4843.75 4
5000 4
5187.5 5
5375 5
5500 4
5656.25 4
5843.75 4
5968.75 4
6156.25 4
6312.5 3
6437.5 3
6593.75 3
6750 3
6875 2
7031.25 2
7156.25 2
7281.25 2
7406.25 1
7500 1
7593.75 1
7656.25 1

 

One thing I noticed is that in the second log, you start at 3600 rpm rather than 3000 rpm. Not saying this is the case, but you may be hitting a lower load cell with more timing when you get on the gas at a higher rpm, or just hitting a different load cell with more timing in it.

If that is just the way you pasted the files... then I would think that you are putting heat into the engine and turbo on the first pull and it is not cooling off enough between runs, so you are starting off the second run in a "heat soaked" condition.

I would back off a degree in the problem area and see what the result is, you could just bee too close to the edge of what the ecu considers knock. Maybee try a colder plug if dropping the timing a degree or so does not get you the constancy you want.....

 

good info , btw 1st run temps were 182 droping to 176 and load was 299 peak droping to 210 .
2nd knockong run was temps were 179 droping 176 and the load was 293 peak droping to 205

 

any other ideas ? I mean it pulled 3* of timing in the 3.5-4.5k rpms , and thats from 140-290 loadcells .
btw airtemps were 61 droping to 58 1st run and 61 to 56 on the 2nd run

 

it sounds like you're tuned on the ragged edge and need to back off the boost/timing a bit or fatten up the afr some. That's why it's incosistent, when you get it right you'll be able to beat on it back to back to back and get the same results.

 

^--^ +1

 

I allways get at least 1 count at around 3700 rpm, IPW at about 20 - 21 and load 285 - 300. Sometimes I get 5 counts but pull off when the widget needle hops.

Might as well tune just below or at the timing pull threashold with boost. That way as soon as the A:F is smooth (timing is set), I will pull back the boost 2 psi.

 

If I understand you correctly, I don't think that strategy will work. Reducing the boost 2 psi is going to put you in lower load cells where your A/F or timing maybe still cause knock if you didn't tune those load cells.

 

What boost level are you running? Alky?

 

Quote:

Originally Posted by matt55

good info , btw 1st run temps were 182 droping to 176 and load was 299 peak droping to 210 . 2nd knockong run was temps were 179 droping 176 and the load was 293 peak droping to 205

[QUOTE][/QUOTE.

Where are you gathering those temperature readings from? Are you referring to charge air temp, and, if so, is the sensor located before or after the IC? Is it a factory temp sensor and are you reading it from the ECU´s datastream? I´m just trying to get a clear picture. I assume it is degrees F., not Celsius.

 

No alky , 23 peaking droping to 21ish on 93 .

 

[QUOTE=sparky;3926458]

Quote:

[/QUOTE.

I was talking about coolant temps , per evoscan .
Air temps were 61 droping to 58 1st run and 61 to 56 on the 2nd (knocking)run , aslo per evoscan . and iam presume its at the maf.

BTW iam running 5*@ 4000rpms



Today I fattened up the cells where i was getting knock at , Iam now runing 8.6 and 8.7's in the high load cells up from 8.8s .

Ill try out the richer tune and if that dont do it ill have to bite the bullet and drop my timing back down some more where iam knocking .

The whole piont of this therad was to try to undersatnd why under the *same* condison 1 log would have NO knock and the next time I get 8 counts ?? I spent a long time looking at both logs and the only thing i could see that differed was the "MAPAFR" on evoscan . On the log with the knock it looks like it "MAPAFR" didnt ramp up as quick as they did on the log with out knock ??

 

Your right but there are few options, tune below the threshhold but pull timing back one degree, or give it fuel? Boost changes 2 psi due to small barometer changes anyways.