Target Boost A/B, WGDC A/B, etc

nsfw · **Joined:** Thu Nov 23, 2006 2:23 am **Posts:** 2565

I was just reading some posts over at NASIOC and IWSTI...

http://forums.nasioc.com/forums/showpos ... count=1424

Quote:

As I said, the timing advance B multiplier is also involved in the map switching for "Target Boost A/B", "Initial Wastegate Duty A/B", and "Primary Open Loop Fueling A/B" and the portion of these maps used would be determined as follows:

Final target = (Map A Target * (1.0 - Map Ratio Multiplier)) + (Map B Target * Map Ratio Multiplier)

http://www.iwsti.com/forums/ecu-tuning- ... aps-2.html

Quote:

You can quite easily tell which map is being used (or a portion of each) by logging "Map Ratio (Primary)" in RomRaider. This map ratio between Target Boost A/B (and several other maps) for the usdm 04-06 STi is the same multiplier applied to "Timing Advance Additive (Maximum)". This multiplier determines the additive advance added to primary advance and will be higher (closer or equal to 1) when conditions are less likely to result in knock and lower (closer or equal to 0) when conditions are more likely to result in knock. A value of zero would entirely use map A, while a value of one would entirely use map b:

* Final target = (Map A Target * (1.0 - Map Ratio A Multiplier)) + (Map B Target * Map Ratio A Multiplier)

From this I gather that "Target Boost A" is used when the ECU has detected significant knock, and "Target Boost B" is used when the ECU has detected negligible knock.

But, I have before me a tune from the Base Maps forum in which the "A" boost and WGDC tables are pretty aggressive and the "B" boost and WGDC tables are stock. That seems backward in light of the above. Is the tune backward, or is something backward in the text above, or have I gotten something backward?

Since the time of those postings, the Open Loop Fueling A/B tables have been renamed "Primary Open Loop Fueling" and "Primary Open Loop Fueling (Failsafe)," but the Target Boost tables remain "A" and "B." So, I propose that the Target Boost tables also be renamed in the next (or next-next) definition update:

Target Boost A ==> Target Boost (Failsafe)
Target Boost B ==> Target Boost

And the WGDC tables:

Initial WGDC A ==> Initial WGDC (Failsafe)
Initial WGDC B ==> Initial WGDC

This would make it somewhat easier to ensure that the tune has the right boost settings in the right tables.

What do you all think? (Merchgod, in particular, since he owns the definition updates...)

merchgod · **Joined:** Thu Mar 30, 2006 2:38 am **Posts:** 5336

That is only relevant to the STis. I do not know what causes the switching (if any) for the LGT, but I do not think it is the same logic (the LGT does not have additive advance maps). Even for the STi, the map switching/ratio is used based on the portion of the additive advance used. Although that is based on the relative absense of knock or conditions that might contribute to knock, it is not really a failsafe/non-failsafe situation.

If you have an LGT, you may want to look at the map ratio and see if it changes at all.

nsfw · **Joined:** Thu Nov 23, 2006 2:23 am **Posts:** 2565

Do STIs use this logic for the target boost A/B tables at all, or only for the timing A/B tables?

merchgod · **Joined:** Thu Mar 30, 2006 2:38 am **Posts:** 5336

The additive advance map ratio multiplier is the same as the target boost a/b, initial wgdc a/b, primary ol fueling a/b map ratio for the USDM STis.

nsfw · **Joined:** Thu Nov 23, 2006 2:23 am **Posts:** 2565

Thanks!

SUPERAnimal · **Joined:** Sat Feb 21, 2009 6:44 am **Posts:** 21

I hate to dumb this thread down but i cant help it. I am not understanding all of what is being said above. I have read both the links above but i still don't know for sure which map is being used. I have a 2004 sti and under timing i have base a and base b, timing advance additive (maximum), timing advance primary 1(maximum) and timing advance primary 2 (maximum). When you say that for the sti the map switching ratio is based on portion of the additive advance used. Are you talking about the timing advance additive table or something else?
The only tables that i am too worried about are the timing advance tables because these are noticably different. The other maps are all pretty much the same (except polf failsafe).

nsfw · **Joined:** Thu Nov 23, 2006 2:23 am **Posts:** 2565

merchgod wrote:

If you have an LGT, you may want to look at the map ratio and see if it changes at all.

That's the most important thing in this thread.

I watched it for a while and never saw it change. So I just make A and B tables identical just in case the are conditions that cause the map ratio to change. Like, lots of knock.

merchgod · **Joined:** Thu Mar 30, 2006 2:38 am **Posts:** 5336

I was looking at this closer recently and map ratio should never change from 1.0 for the usdm lgts, as far as I can tell. Just needed someone to confirm this. I think the reason why there are two tables is it is setup this way for the non-usdm lgts that have the ECO mode and then it is simply disabled in the usdm lgts.

wrxsti-l · **Posted:** Wed Mar 18, 2009 11:59 pm

If you are note sure which of the A/B target boost and wgdc tables to use, would it be a bad thing to set them both the same? There are other failsafes that will come into play if there is knock so I don't see any problem leaving the target boost and wgdc tables identical for simplicity.

Please explain if this is bad in any way (and why).

nsfw · **Joined:** Thu Nov 23, 2006 2:23 am **Posts:** 2565

What is "ECO mode?" Economy?

Can it be re-enabled without much work?
Can it be manipulated to do fun things?

merchgod · **Joined:** Thu Mar 30, 2006 2:38 am **Posts:** 5336

NSFW wrote:

What is "ECO mode?" Economy?

Can it be re-enabled without much work?
Can it be manipulated to do fun things?

They have some button or something on the dash for ECO mode. I was reading about it on some guy's blog in Japanese (translated with google so it wasn't exactly easy to understand). He was also logging the map ratio with RomRaider.

mickeyd2005 · **Joined:** Wed Oct 25, 2006 4:32 am **Posts:** 3040

Oh.... that would be nice...

maxouni · **Posted:** Sun Jan 08, 2012 5:24 am

merchgod wrote:

I was looking at this closer recently and map ratio should never change from 1.0 for the usdm lgts, as far as I can tell. Just needed someone to confirm this. I think the reason why there are two tables is it is setup this way for the non-usdm lgts that have the ECO mode and then it is simply disabled in the usdm lgts.

My JDM LGT does not change map ratio by switching ECO mode. I have never seen map ratio other than 1.0 in my logs.
It would be nice to have map switching button.

RomRaider

Target Boost A/B, WGDC A/B, etc

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