timing advances on its owne
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Joined: May 2009
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From: mnt vernon ny
timing advances on its owne
hey,so i randomly walk with my laptop to log different roads and driving scenarios (yes slowly becoming a tuning geek 
) and i did a w.o.t pull coming from school and my timing at P.T/P.B was maped at 4 and logged at 6.. there are a few places as well that the timing jumped a degree or two as well. but is this normal? i mean i would think it would be extremely consistent. i only saw this "anomoly" once so let me know if its normal thnx in advance.
) and i did a w.o.t pull coming from school and my timing at P.T/P.B was maped at 4 and logged at 6.. there are a few places as well that the timing jumped a degree or two as well. but is this normal? i mean i would think it would be extremely consistent. i only saw this "anomoly" once so let me know if its normal thnx in advance.
could be a few things.
1. are you higher than sea level? case where I live. We need to make an adjust ment to the mut table so 2 byte load will log load off baro pressure and intake temp. The other setting will always log as if the car is at sea level showing a much higer load than actual. ( I have a theroy on that which is if the ecu reads that false load area it will adjust timing and afr's that specifice area. Even if the car is not hitting that load)
2. sometimes the EGR will advance timing to help out emissions. I have only seen that on my car during regular driving at a constant speed/ load. The map will say 35* but I will log 43* that is the EGR advancing for emissions.
1. are you higher than sea level? case where I live. We need to make an adjust ment to the mut table so 2 byte load will log load off baro pressure and intake temp. The other setting will always log as if the car is at sea level showing a much higer load than actual. ( I have a theroy on that which is if the ecu reads that false load area it will adjust timing and afr's that specifice area. Even if the car is not hitting that load)
2. sometimes the EGR will advance timing to help out emissions. I have only seen that on my car during regular driving at a constant speed/ load. The map will say 35* but I will log 43* that is the EGR advancing for emissions.
Thread Starter
Evolved Member
Joined: May 2009
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From: mnt vernon ny
Yea I'm logging 1 byte load x=1.3 umm seeing 290 ish load were I leve I'm about 300-700 ft above sea lvl. Also I have all my egr stuff disabled because of my old car withe the swap use too do it alll the time. I mean I don't mind the advance if the car takes it. I just want want consistency. And to address the false load reading I retarded the timing to speed up spool up and there are no 6's in that rpm zone haha. Ill post the log as soon as I get out of class and check out the log I did on my way to school(I was late)
Last edited by hediki12; Apr 2, 2010 at 09:34 AM. Reason: typing realy fast on phone bad spelling
I don't think you understood what I was saying...
You may be logging a different load than the ECU uses to look up timing. For example, if you are logging 1byte uncompensated load, that isn't the load the ECU uses to look up timnig.
The ECU uses baro+temp compensated load for timing when intake temps are < 77F. When > 77F, then baro compensated load is used.
You may be logging a different load than the ECU uses to look up timing. For example, if you are logging 1byte uncompensated load, that isn't the load the ECU uses to look up timnig.
The ECU uses baro+temp compensated load for timing when intake temps are < 77F. When > 77F, then baro compensated load is used.
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Thread Starter
Evolved Member
Joined: May 2009
Posts: 522
Likes: 2
From: mnt vernon ny
I don't think you understood what I was saying...
You may be logging a different load than the ECU uses to look up timing. For example, if you are logging 1byte uncompensated load, that isn't the load the ECU uses to look up timing.
The ECU uses baro+temp compensated load for timing when intake temps are < 77F. When > 77F, then baro compensated load is used.
You may be logging a different load than the ECU uses to look up timing. For example, if you are logging 1byte uncompensated load, that isn't the load the ECU uses to look up timing.
The ECU uses baro+temp compensated load for timing when intake temps are < 77F. When > 77F, then baro compensated load is used.