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Old 01-23-2008, 02:06 AM   #1
CenCali07sti
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Member#: 144523
Join Date: Mar 2007
Location: Modesto, California
Vehicle:
2007 Sti
Satin Pearl White

Default questions about unused tables

I figured it would not hurt to view a copy of cobb stage 2 ots and compare it to my stock map just to get an idea of how things work. I have a question though.

Why is it that both on my target boost and initial wastegate duty cycle tables that the only tables that have any change on both are labeled "UNUSED". The other ones labeled A and B on both types of tables there is not difference in numbers when compared to the cobb stage 2 ots?

Target boost for my car according to data logging is deffinetly trying to follow the table labeled unused even though it is overboosting right now by about 1psi compared to the table.

Just to clarify I am just doing this to view and learn I am not messing with cobbs maps because I have no clue what I am doing if I were to change something.

Another question I have is if you have a target boost table why does the ECU just not control the wastegate itself? Why do you also need a duty cylce table? I am sure there is a reason but to such a noob like me when it comes to tuning it seems odd you give the car a target boost but then you als have to tell it how to get there with WGDC tables. Just random thoughts.
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Old 01-23-2008, 02:41 AM   #2
mickeyd2005
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Chapter/Region: NWIC
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Default

The Cobb rom is not a stock rom. Cobb modified it to make room for their realtime tuning. Enginuity is really meant to be used with stock roms.

Do you know how the wastegate actuator is physically controlled? The ecu controls bleed off. That controls pressurization of the actuator. Read up on boost control.

http://forums.cobbtuning.com/forums/...ad.php?t=32552
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Old 01-23-2008, 02:45 AM   #3
Airboy
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Join Date: Oct 2004
Chapter/Region: W. Canada
Location: Calgary, Canada
Vehicle:
2006 WRX
EFR6758

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The "unused" tables are unused in a normal ECU. Cobb uses these tables to store their maps. Something to do with their real time map system, IIRC.

As for the WGDC table, they help speed up the boost control process by starting with values that are "in the ball park".
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Old 01-23-2008, 09:04 AM   #4
Tea cups
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Join Date: Dec 2005
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Cobb's real-time tuning is simple. For the real-time capable maps, they simply redirect the ECU to always read these tables out of RAM which would be written there by the AP (real-time map). Then there's a small chunk of code that copies the corresponding RT tables from ROM (base map) to RAM after a reset (otherwise you would have problems).

The fact that the ECU always reads the RT tables from ram means that for the "base" map tables that have multiple maps in the factory ECU (for example, Target Boost), Cobb can place the "base" table in any one of the multiple maps (and leave the rest stock). So, on a manual transmission ROM, they could place it in the auto tranny map and it wouldn't matter because the ECU will always read the table out of RAM.

The 07 USDM STi is unique in that rather than having AT/MT multiple tables, it has a series of unused maps that the factory ECU never uses (as is). Cobb probably is using these maps as placeholders for the base map. Again, it doesn't matter as it is only used to copy from after a reset. In fact, the only reason I've added the unused tables and the opposite transmission tables (AT tables on an MT rom) for the USDM ECUs is so that users who own an AP can still tune with Enginuity. It isn't rocket science.
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