Can someone explain (timing related Q)
Mar 1, 2011, 07:40 AM
#31
ok... There are 4 tables, 2 for Intake 2 for Exhaust MIVEC.
Basically the ECU works out if the Actual Exhaust MIVEC is less than or greater than the Map Exhaust MIVEC.
Same for Intake MIVEC
Once it chooses which table to get the data from it then multiplies the actual difference by whatever the map lookup results in then divides by 0xA00
THEN it applies that as an ignition timing compensation...
ie, if you had 5* different between actual and map for the exhaust then it would be:
(5 * 32) * (whatever is in these 4 maps, ie 20*) / 0xA00 = 1.25*
so your timing would go up or down 1*
now this doesn't seem to be very much, but I just dont like the looks of these 4 tables:
The values just seem so random, 20 with 0's on either side...
I am thinking of zero'ing out these tables
Basically the ECU works out if the Actual Exhaust MIVEC is less than or greater than the Map Exhaust MIVEC.
Same for Intake MIVEC
Once it chooses which table to get the data from it then multiplies the actual difference by whatever the map lookup results in then divides by 0xA00
THEN it applies that as an ignition timing compensation...
ie, if you had 5* different between actual and map for the exhaust then it would be:
(5 * 32) * (whatever is in these 4 maps, ie 20*) / 0xA00 = 1.25*
so your timing would go up or down 1*
now this doesn't seem to be very much, but I just dont like the looks of these 4 tables:
The values just seem so random, 20 with 0's on either side...
I am thinking of zero'ing out these tables
I see now need for these random values or how they would actually help at all...
Mar 1, 2011, 10:51 AM
#33
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All 0's.
In my car, I run E-85 and when the ECT is cold, it runs very nice with those settings. Before I zeroed out the table, it would hesitate / miss a bunch when cold. My wideband would go massively lean and the engine would feel like it died. Now, it runs perfect when cold.
I used to have to warm it up to 100*f before it would drive normal. Now I can drive it much colder if I have to. I normally like to warm it up though.
In my car, I run E-85 and when the ECT is cold, it runs very nice with those settings. Before I zeroed out the table, it would hesitate / miss a bunch when cold. My wideband would go massively lean and the engine would feel like it died. Now, it runs perfect when cold.
I used to have to warm it up to 100*f before it would drive normal. Now I can drive it much colder if I have to. I normally like to warm it up though.
Mar 1, 2011, 11:12 AM
#35
All 0's.
In my car, I run E-85 and when the ECT is cold, it runs very nice with those settings. Before I zeroed out the table, it would hesitate / miss a bunch when cold. My wideband would go massively lean and the engine would feel like it died. Now, it runs perfect when cold.
I used to have to warm it up to 100*f before it would drive normal. Now I can drive it much colder if I have to. I normally like to warm it up though.
In my car, I run E-85 and when the ECT is cold, it runs very nice with those settings. Before I zeroed out the table, it would hesitate / miss a bunch when cold. My wideband would go massively lean and the engine would feel like it died. Now, it runs perfect when cold.
I used to have to warm it up to 100*f before it would drive normal. Now I can drive it much colder if I have to. I normally like to warm it up though.
On the RA, if i zero it or even half it, I throw the P050B.
Apr 5, 2011, 07:27 AM
#39
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any updates on this? I suffer from excessive timing retard until coolant temp rises just a little bit... car falls flat on its face and goes lean, and I believe it is related (I knew there were more coolant related timing maps than met the eye)
Apr 5, 2011, 04:02 PM
#40
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Tephra, back to your original post question, warmup advance (adding), most aftermarket engine management have a 2D table to add timing when the coolant is low.
I believe it is to help with the slower burn rate of gasoline when cold.
Adding advance when cold certainly has hepled in these circumstances, so I was always curious as to why a corresponding table was not found in our ROMs.
Seems like it was there all along - will have to start searching again I guess.
I believe it is to help with the slower burn rate of gasoline when cold.
Adding advance when cold certainly has hepled in these circumstances, so I was always curious as to why a corresponding table was not found in our ROMs.
Seems like it was there all along - will have to start searching again I guess.
Apr 12, 2011, 08:21 AM
#41
Tephra, back to your original post question, warmup advance (adding), most aftermarket engine management have a 2D table to add timing when the coolant is low.
I believe it is to help with the slower burn rate of gasoline when cold.
Adding advance when cold certainly has hepled in these circumstances, so I was always curious as to why a corresponding table was not found in our ROMs.
Seems like it was there all along - will have to start searching again I guess.
I believe it is to help with the slower burn rate of gasoline when cold.
Adding advance when cold certainly has hepled in these circumstances, so I was always curious as to why a corresponding table was not found in our ROMs.
Seems like it was there all along - will have to start searching again I guess.
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