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Old 04-10-2014, 04:38 PM   #1
dirtcollector
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Default Question regarding the DAM after ecu reset

Hey guys I was doing some maintenance on my vehicle (05 sti) and disconnected my battery prior to me working on it which of course reset my ecu and put it in learn mode. So... when the value in the DAM column goes back to 1 does this mean my car is back to normal so to speak and has regained full power or am I way off here. Right now my DAM is at 0.6 and I am seeing positive corrections in the fine knock learning from 0.3 to 1.4 while cruising. Is this normal after an ecu reset? Can someone shed some light on this for me. Thanks!
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Old 04-11-2014, 07:19 AM   #2
DeviAnt985
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Don't take this as me offending you but have you watched this video yet? It explains a little bit of what you're asking about. Just trying to help any way I can without my personal input and/or lack of knowledge on the subject, as I am learning as well

http://youtu.be/rjEGZ-4dsDY
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Old 04-11-2014, 07:25 AM   #3
ride5000
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it depends on how the tune was made.

for example, the tuner may have decided that with full ignition advance (DAM=1) there should still be some knock margin left on the table. this will create a situation in which given repeatable octane the car never knocks. however, it also means that the ecu will not attempt to increase advance and net additional torque.

the tuner may have also decided to rely on the knock detection and ignition learning to pull back timing a little bit during average octane/driving. this is how FHI sets up the maps, so it is a perfectly viable method. it DOES mean that the ecu will continually attempt to push the timing back up and will do so until knock is detected. that knock will show up as DAM<1, and may show some fine learning corrections, either positive or negative. the advantage here is that you know you're pretty much running the maximum timing advance (iow, torque) for a given set of conditions.
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Old 04-11-2014, 09:10 AM   #4
dirtcollector
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Double post..

Last edited by dirtcollector; 04-11-2014 at 09:17 AM. Reason: double post
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Old 04-11-2014, 09:12 AM   #5
dirtcollector
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Quote:
Originally Posted by ride5000 View Post
it depends on how the tune was made.

for example, the tuner may have decided that with full ignition advance (DAM=1) there should still be some knock margin left on the table. this will create a situation in which given repeatable octane the car never knocks. however, it also means that the ecu will not attempt to increase advance and net additional torque.

the tuner may have also decided to rely on the knock detection and ignition learning to pull back timing a little bit during average octane/driving. this is how FHI sets up the maps, so it is a perfectly viable method. it DOES mean that the ecu will continually attempt to push the timing back up and will do so until knock is detected. that knock will show up as DAM<1, and may show some fine learning corrections, either positive or negative. the advantage here is that you know you're pretty much running the maximum timing advance (iow, torque) for a given set of conditions.
Thanks ride5000 good info! That clears things up for me!
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