The stock ECU has gear dependent boost control!
#31
EvoM Guru
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In the ROM there are definitions for 4 BWGDC tables, 3 are actually referenced by code, and 2 are actually used.
I guess when people where discovering the tables from the ROM they didn't/couldn't look at which tables where actually being used by the code, so they just put all 4 in the XML...
I guess when people where discovering the tables from the ROM they didn't/couldn't look at which tables where actually being used by the code, so they just put all 4 in the XML...
#32
EvoM Staff Alumni
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Your Avatar says you have an Evo IX, but it sounds as if you are asking about an Evo 8. Either way, there are only two sets of tables that are used. For the Evo 9, its set #1 and #3. #2 is never called by the code. For Evo 8s, I'm not sure which two of the four tables gets called because I've never bothered to go through the boost control code in detail on an Evo 8. tephra might be able to answer, but otherwise, I recommend figuring it out by trial and error.
#33
Evolved Member
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I haven't messed with PSI targeted boost control yet, just the load targeted setup but I certainly see where different boost in 1st gear is useful, 2nd & 3rd have their own and 4th gear has its own for the 1/4 mile fellas. I hate having 3rd gear dialed in to the max but its too much for 4th gear and I get knock up top before I cross the finish line
#35
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Hmm. Did you not read the entire first post? Boost Control Limiting Speed is an incorrect interpretation of the ROM code. RPM/MPH crossover point is the correct interpretation. The Boost Control Limiting Speed entry in the ECUFlash xml files should be deleted because its wrong.
I tried this today: changed the crossover to 105 modified bdel & wgdc#1 and #3 with different values but the logged wgdc remained the same in gears 1-3
#36
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If there was a way to take this finding and make some kind of wgdc table/target boost table for each gear it would be the greatest thing since sliced bread........
dunno how possible that actually is though..
dunno how possible that actually is though..
#38
EvoM Guru
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possibly.
but I go to great lengths to ensure what we are removing (in this multi wgdc map case) wasn't being used.
Every ROM i have seen has had 0xFFFF set for the BLCS, which effectively disables it. Thus removing it didn't "hurt" anything.
But now we have a better understand of its capabilities I will see if I can add it back in
but I go to great lengths to ensure what we are removing (in this multi wgdc map case) wasn't being used.
Every ROM i have seen has had 0xFFFF set for the BLCS, which effectively disables it. Thus removing it didn't "hurt" anything.
But now we have a better understand of its capabilities I will see if I can add it back in
#41
I did read the post ...I just made an observation since I was curious to know if it had relevance since the values changed, I guess not then.
I tried this today: changed the crossover to 105 modified bdel & wgdc#1 and #3 with different values but the logged wgdc remained the same in gears 1-3
I tried this today: changed the crossover to 105 modified bdel & wgdc#1 and #3 with different values but the logged wgdc remained the same in gears 1-3
I've been through the ignition map selection routine, and there's no algorithm for map selection based on gear ratio. Turns out that the rpm/mph variable is used in only a few places. The boost control algorithm is the only place its used for map selection.
#42
I did read the post ...I just made an observation since I was curious to know if it had relevance since the values changed, I guess not then.
I tried this today: changed the crossover to 105 modified bdel & wgdc#1 and #3 with different values but the logged wgdc remained the same in gears 1-3
I tried this today: changed the crossover to 105 modified bdel & wgdc#1 and #3 with different values but the logged wgdc remained the same in gears 1-3
#43
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FYI, the auto cars heavily rely on gear dependance for not just the boost, but also main fuel and ignition map selection. They use one map for 1st and 2nd gear and another for 3rd, 4th,5th gears. Maybe some browsing through the code may help to see if the same can be applied to other roms to allow the same feature.