Ignition timing
Thread Starter
MBWorld Fanatic!
Joined: Dec 2013
Posts: 2,394
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E63
Ignition timing
I have a question, what do you guys who view or datalog your sensors see for timing at the OBD port?
I am seeing timing always in the negative values and it's throwing me off. I am used to seeing timing in the 30s to 40s for EVERY OTHER car I have looked or tuned, but for the E55, I am seeing negative 20s to negative 30s and the same under WOT (mid to low negative 20s).
Is this normal??? Are OBD scanners simply reading in reverse?
I am seeing timing always in the negative values and it's throwing me off. I am used to seeing timing in the 30s to 40s for EVERY OTHER car I have looked or tuned, but for the E55, I am seeing negative 20s to negative 30s and the same under WOT (mid to low negative 20s).
Is this normal??? Are OBD scanners simply reading in reverse?
Junior Member
Joined: Jan 2014
Posts: 30
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AMG
Timing should show up in negative values since its degrees before top dead center. When I used to log my BMWs it would show in negative values also. But with forced induction engines it should be way lower. I would guess in the upper teens or low low 20s. N/A cars will be in the 30-40 range.
Thread Starter
MBWorld Fanatic!
Joined: Dec 2013
Posts: 2,394
Likes: 239
E63
Interesting BmwBob, I have logged many a cars but never a European car. All the american and Japanese cars I've logged always showed values in the positives unless something was very wrong
Junior Member
Joined: Jan 2014
Posts: 30
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AMG
I am used to seeing the negative numbers with my previous cars so I think that's just how the germans do it. What are you using to log with? I will be in the market to some such equipment soon and any insight would be appreciated.
