3rd gear pull dsmlink opinions - Page 2

chadnum1 · 10-22-2009, 05:38 PM

update. did blt and its good, did compression check and its good. new plugs today. Attaching an idle log and 3rd gear log. question, Im showing knock in the same area but now my boost gauge which is set to knock doesnt move and the check engine light doesnt flash, so shouldnt those 2 things still be showing knock if Im getting it?

JeffGST · 10-23-2009, 02:32 AM

You didn't make any of the changes I suggested in the last post. The airflow sliders are still unchanged.

Your fuel trims are still just about maxed out positive.

You need to verify base timing. Please post what you have timing currently set at. Coolant temps are a little high but not to the point that it would cause the knock that you are seeing. According to the Front O2 readings, you are not running that lean either. I would still suspect that base timing may be off a degree or two.

The reason why you don't see the CEL flashing on your dash, is because you have it set to flash only when you have knock retard levels above 5.0 degrees. The highest knock I see in that log is 4.6 degrees. I would lower the setting to 3 degrees while you are still tuning.

JeffGST

chadnum1 · 10-23-2009, 03:54 AM

I did those pulls before I saw your post. My base timing is at 5 degrees. Accorsing to your formula for adjustments I added 19 tp the 50 slider and 17 to the 150 slider.

JeffGST · 10-23-2009, 02:53 PM

Quote:

Originally Posted by chadnum1

I did those pulls before I saw your post. My base timing is at 5 degrees. Accorsing to your formula for adjustments I added 19 tp the 50 slider and 17 to the 150 slider.

If you are positive that base timing is set at 5 degrees BTDC, then I would make the follow adjustments to the timing sliders.

5500 RPM = -1 degree from where it is right now
6000 RPM = -3
6500 RPM = -5
7000 RPM = -5
7500 RPM = -5
8000 RPM = -5

Then be done with it.

chadnum1 · 10-23-2009, 06:15 PM

Ok here are some logs with all the stated changes made. Idle and 3rd gear pull.

JeffGST · 10-24-2009, 03:53 AM

Quote:

Originally Posted by JeffGST

1) Add MAFraw to your captured values
2) Add 12% to your 50Hz slider from where you are currently at
3) Add 11% to your 150Hz slider from where you are currently at
4) Check base timing and tell me where it is currently set at.

Repost the log after a days worth of driving.

JeffGST

Why did you raise the 50Hz slider all the way up to +19%? I told you to go to +12% and LTFT lo would have been perfect. LTFT mid will level out close to 0%, if you followed step #2 on my post. Bring that 150Hz slider back down to +11% and your fuel trims will be perfect after a day full of driving.

Notice your 3rd gear pull look just about knock free.

JeffGST

chadnum1 · 10-24-2009, 04:11 AM

The info you gave me said to add stft to ltftlo and that would give me the adjustment. I was just following the formula. Knock is improving and I really appreciate the help Jeff.

Ok I adjusted the sliders as you suggested and drove all day. ltft lo seems to be about zeroed out but ltft mid is still hovering around 10. Whats my next move, the rest of the mid sliders? Heres an idle log after about 40 miles worth of driving.

JeffGST · 10-25-2009, 04:07 AM

Quote:

Originally Posted by chadnum1

Ok I adjusted the sliders as you suggested and drove all day. ltft lo seems to be about zeroed out but ltft mid is still hovering around 10. Whats my next move, the rest of the mid sliders? Heres an idle log after about 40 miles worth of driving.

Idle logs will not show any valuable information about LTFT mid fuel trims. I want to see a log where you are at 75Hz-150Hz MAFraw. But then again, I really don't need to see it, since I know after a few days of driving on the highway that LTFT mid will eventually level out close to zero.

PATIENCE. If you notice that STFT's are -8% to -10% when MAFraw is in the 75-150Hz range, then LTFT mid will eventually level out.