Help with wgdc

Rufus bmw

Lurker
May 22, 2020
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My boost dropping off from target from 4k RPM on. I can see wastegate % is relatively low. Do you guys typically increase wgdc base and adder to close the wasegates more and hold higher psi closer to target or adjust PID !?

Thanks
 

JBacon335

Corporal
Nov 7, 2016
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40
Toms River, NJ
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07 335i Sedan, 1988 Mustang GT
I'd add 10% to the base and see how it holds. Load never hits target on that log but there's plenty of headroom
 

Jeffman

Major
Jan 7, 2017
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Do you guys typically increase wgdc base and adder to close the wasegates more and hold higher psi closer to target...?
Yes. This is what I do to get ~22-23 psi boost @ 4500 prior to taper (stock inlets) with WOT from stockers. WGDC is 99%...they haven’t blown yet after all these years!
 
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Rufus bmw

Lurker
May 22, 2020
10
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Yes. This is what I do to get ~22-23 psi boost @ 4500 prior to taper (stock inlets) with WOT from stockers. WGDC is 99%...they haven’t blown yet after all these years!
What load target do you run for 23 psi ?

Do you also expend your wgdc y axis . I can see x axis is maf request and it needs to be scaled up which I did. What does the value on y axis represent ? Thanks
 

Jeffman

Major
Jan 7, 2017
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Here's my latest bin - for Flex Fuel. This is completely home-brewed based on tweaks and various adjustments over the years, including the latest throttle adjustments for an AT. Happy tuning!
 

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Rufus bmw

Lurker
May 22, 2020
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Here's my latest bin - for Flex Fuel. This is completely home-brewed based on tweaks and various adjustments over the years, including the latest throttle adjustments for an AT. Happy tuning!
Thanks for your help. But what
Xdf are you using I tried to open some maps and they all seem to be scewed.
 

Rufus bmw

Lurker
May 22, 2020
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Mine is IJEOS.
Got it. I noticed your wgdc at 401 is value 58. Which I though was fully closed gates . Your adder for 401 is 35.63. how does adder help if your base value is already indicating fully closed wastegates .

Is x axis in wgdc base maf req or maf req wgdc log value ? I am seeing maf req wgdc as high as 520 in my logs. I am best to scale out the x axis into 500s?
Thanks again .
 

Jeffman

Major
Jan 7, 2017
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Sorry, I don’t recall. I haven’t looked at that part of the tune in quite some time.
 

JBacon335

Corporal
Nov 7, 2016
227
107
0
40
Toms River, NJ
Ride
07 335i Sedan, 1988 Mustang GT
Got it. I noticed your wgdc at 401 is value 58. Which I though was fully closed gates . Your adder for 401 is 35.63. how does adder help if your base value is already indicating fully closed wastegates .

Is x axis in wgdc base maf req or maf req wgdc log value ? I am seeing maf req wgdc as high as 520 in my logs. I am best to scale out the x axis into 500s?
Thanks again .
100 would be completely closed in my understanding