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how-to: ECU-based direct boost control

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Old Aug 15, 2009 | 12:55 PM
  #736  
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From: Trinidad
bump for help still overboosting
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Old Aug 15, 2009 | 08:42 PM
  #737  
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Originally Posted by rolly1818
mfred

need your input here: i moved to SD with 88570008 - JDM rom that jscbanks made. car idles great, dries normal (AFRS look fine).

however, my max WGDC on the Alt map and main map are both set below where i should be (at 20) i should be getting 12 psi as normal, however, i am seeing 29 psi!

i tested the wastegate solenoid using evoscan and it clicks!

here are some pics of my settings:

...

the only thing i can guess is the BDEL has more of an effect for SD????

Thanks
In the RPM range where its possible to get 29 psi, you've got a target load of 158 (BCLO) + 158 (BDEL) = 316. What ROM where you using before?
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Old Aug 15, 2009 | 11:57 PM
  #738  
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From: Trinidad
thanks for the reply i was on 85880014, i had it configured for BDEL on my map.

i always thought the BDEL was just to make it spool faster and the WGDC controls the actual amount of boost?

hmmm maybe with SD the BDEL has more influence?

so i should drop my BDEL Level to desired and try from there?

BTW: any chance on doing direct boost control for 88570008 (JDM IX)?
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Old Aug 18, 2009 | 11:58 AM
  #739  
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From: Trinidad
Originally Posted by rolly1818
thanks for the reply i was on 85880014, i had it configured for BDEL on my map.

i always thought the BDEL was just to make it spool faster and the WGDC controls the actual amount of boost?

hmmm maybe with SD the BDEL has more influence?

so i should drop my BDEL Level to desired and try from there?

BTW: any chance on doing direct boost control for 88570008 (JDM IX)?
bump for help!
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Old Aug 18, 2009 | 02:43 PM
  #740  
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From: Ca
Rolly,

your "BCLO" (boost control load offset) + "BDEL" (boost desired engine load) is what your target load should be.
When I was running "load based control" I set up my BCLO to 200, and 95 in the BDEL, up to 3500, and taper to whatever load levels your hitting.

And then from there, "WGDC" is what is used to achieve that target load/boost... So if your not hitting target load, you need to add WGDC...
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Old Aug 18, 2009 | 02:59 PM
  #741  
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From: Trinidad
Originally Posted by nonschlont
Rolly,

your "BCLO" (boost control load offset) + "BDEL" (boost desired engine load) is what your target load should be.
When I was running "load based control" I set up my BCLO to 200, and 95 in the BDEL, up to 3500, and taper to whatever load levels your hitting.

And then from there, "WGDC" is what is used to achieve that target load/boost... So if your not hitting target load, you need to add WGDC...
yup i know what i am asking is: does the BDEL and BCLO actually control how much boost i hit? or cause me to overboost?

i doubt it, once the WGDCs are all 20 like in the picture i attached earlier i should be fine and be hitting wastegate boost right?

unless the dual solenoid bit adds some complication
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Old Aug 18, 2009 | 03:08 PM
  #742  
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From: Hayward
Originally Posted by rolly1818
yup i know what i am asking is: does the BDEL and BCLO actually control how much boost i hit? or cause me to overboost?

i doubt it, once the WGDCs are all 20 like in the picture i attached earlier i should be fine and be hitting wastegate boost right?

unless the dual solenoid bit adds some complication
If you have error correction on, then BDEL + BCLO will add or subtract WGDC depending on how over/under you are from their target.

Does anybody read the how-to in the first post anymore?
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Old Aug 18, 2009 | 03:20 PM
  #743  
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From: Trinidad
If you have error correction on, then BDEL + BCLO will add or subtract WGDC depending on how over/under you are from their target.

Does anybody read the how-to in the first post anymore?
i read it

i tried with zero correction! thats why i posted its a weird issue
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Old Aug 18, 2009 | 03:24 PM
  #744  
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From: Hayward
You will need less WGDC on the passive secondary solenoid.
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Old Aug 18, 2009 | 03:29 PM
  #745  
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From: Ca
Originally Posted by rolly1818
yup i know what i am asking is: does the BDEL and BCLO actually control how much boost i hit? or cause me to overboost?

i doubt it, once the WGDCs are all 20 like in the picture i attached earlier i should be fine and be hitting wastegate boost right?

unless the dual solenoid bit adds some complication
BCLO is ONLY an offset value, since the ecu can only read load up to 159. Some1correct me if Im wrong...

BDEL + BCLO is the "target" for how much load/boost you wanna run.
MWGDC is what actually controls if you will reach your target load/boost.

Tune the car w/ the + corrections off, and when done working on your boost profile, then add the + corrections back in, and go at it again... Now if your BDEL is too low for that rpm/load range, you will overshoot, and corrections will take place... Remember to give yourself ~ 5 - 10 load points, just in case you do, overshoot... Ex. If you hit 280 load in your log, put in 85 in your table (if you have 200 as BCLO)

I Hope Im helping, and not telling you things you already know...

edit: do you have the secondary solenoid? If so, listen to GST!
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Old Aug 18, 2009 | 03:57 PM
  #746  
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From: Trinidad
car HAD a secondary boost solenoid....

now it is the 3 port boost solenoid.

You will need less WGDC on the passive secondary solenoid.
those are the answers i am looking for! so for example, theoretically!:

WGDC #1/1 = 70 (hoping for 21 psi)
WGDC #1/2 = 0 (being "passive")?
WGDC #1/3 = 0 (being "passive")?

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another problem is how am i gonna do this in tephra's mod!
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Old Aug 18, 2009 | 09:24 PM
  #747  
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So here's a question. If WGDC can't be greater than 100%, how do you eliminate massive taper when you're already maxing the wastegate? Here is a log I took tonight:

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Old Aug 18, 2009 | 09:33 PM
  #748  
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u can get a 3port bcs - that will hold a bit more boost up top..
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Old Aug 18, 2009 | 10:08 PM
  #749  
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Surely there must be a way without that. I mean, here Mr.Fred is running on the stock boost solenoid and his boost is tapering a lot less (in fact this is really the profile I'm looking for as well).

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Old Aug 18, 2009 | 10:14 PM
  #750  
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mrfred runs a funky pill setup...

i dont know the specifics, but 3port will produce the same if not better result..
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