how-to: ECU-based direct boost control
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Your 2-byte load is 250 at 7800 rpm. I'm guessing the boost is close to 23 psi which is pretty good for 7800 rpm. Adding a restrictor pill in the WGA line will only slow the responsiveness of the boost control system. There are a few things that you can try that fall into category "C":
1) Ditch the stock airbox for a good cone filter setup. razorlab has found it makes a substantial improvement in high rpm power when going from the stock airbox to his GST cone filter.
2) Install an aftermarket O2 housing. I prefer the Titek as its very well made and there will be no boost creep issues with it.
1) Ditch the stock airbox for a good cone filter setup. razorlab has found it makes a substantial improvement in high rpm power when going from the stock airbox to his GST cone filter.
2) Install an aftermarket O2 housing. I prefer the Titek as its very well made and there will be no boost creep issues with it.
Correct on the 23-24psi at 8k, was just hoping i could keep it flat up there.
BTW do the alt maps work for map switching when using PSI based? Not sure how all the "correction tables" (boost adder, baseline boost) go into play..
Guessing I just run the different wastegate duties, and the "correction part" works for both persepctively? Thanks!
Last edited by tnt1106; Oct 15, 2008 at 09:36 AM. Reason: adding pic for baro
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I have a heavily ported SS O2 with ported stock ex manifold. My baro isnt dropping due to my "modified airbox"
Correct on the 23-24psi at shift point, was just hoping i could keep it flat up there.
BTW do the alt maps work for map switching when using PSI based? Not sure how all the "correction tables" (boost adder, baseline boost) go into play..
Guessing I just run the different wastegate duties, and the "correction part" works for both persepctively? Thanks!
Correct on the 23-24psi at shift point, was just hoping i could keep it flat up there.
BTW do the alt maps work for map switching when using PSI based? Not sure how all the "correction tables" (boost adder, baseline boost) go into play..
Guessing I just run the different wastegate duties, and the "correction part" works for both persepctively? Thanks!
For alt maps with psi-based boost control, all that's needed is to use the "psi" scalings with the alt map boost tables.
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From: Dallas, TX
I added pic with baro line at top. it tapers some but i didnt think enough for boost to fall off. (92.61 is lowest at 8297rpm)
.[/QUOTE]For alt maps with psi-based boost control, all that's needed is to use the "psi" scalings with the alt map boost tables.[/QUOTE]
I am missing that in my rom? for alt maps boost related i have Alt base wastegate duty. and alt BDEL table.
[quote]If you are keeping 23-24psi up top that is great.[quote]
More please ^
Last edited by tnt1106; Oct 15, 2008 at 09:56 AM.
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The psi-based boost control system stores the table data in the same place as the stock boost control system, so changing from BDEL to baseline boost only requires changing the scaling in the table definition. Same for BCLO and Boost Adder. And same for the WGDC correction table.
Post up the altmap boost control definitions, and I'll modify them for you.
Post up the altmap boost control definitions, and I'll modify them for you.
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Evolving Member
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From: Dallas, TX
The psi-based boost control system stores the table data in the same place as the stock boost control system, so changing from BDEL to baseline boost only requires changing the scaling in the table definition. Same for BCLO and Boost Adder. And same for the WGDC correction table.
Post up the altmap boost control definitions, and I'll modify them for you.
Post up the altmap boost control definitions, and I'll modify them for you.
<table name="RPM" address="722e" type="Y Axis" elements="16" scaling="RPM"/>
</table>
<table name="Alternate Boost Desired Engine Load" category="Mods" address="4a158" type="2D" scaling="Load8">
<table name="RPM" address="722e" type="Y Axis" elements="16" scaling="RPM"/>
</table>
So that is way more than I should have at those rpm?
Yes 23-24 psi past 7000 you should be happy. Can't get much more than that on the stock turbo and even if you did, it's not always going to provide a gain.
We set up a 05 to run 26psi straight across on a heavily ported Evo 9 turbo. It made more power tapering down to 23 psi then holding it at 26psi. And yes I tried a ton of different tuning strategies.
We set up a 05 to run 26psi straight across on a heavily ported Evo 9 turbo. It made more power tapering down to 23 psi then holding it at 26psi. And yes I tried a ton of different tuning strategies.
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Yes 23-24 psi past 7000 you should be happy. Can't get much more than that on the stock turbo and even if you did, it's not always going to provide a gain.
We set up a 05 to run 26psi straight across on a heavily ported Evo 9 turbo. It made more power tapering down to 23 psi then holding it at 26psi. And yes I tried a ton of different tuning strategies.
We set up a 05 to run 26psi straight across on a heavily ported Evo 9 turbo. It made more power tapering down to 23 psi then holding it at 26psi. And yes I tried a ton of different tuning strategies.
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<table name="Alternate Baseline Boost" category="Mods" address="4a158" type="2D" scaling="psia8">
<table name="RPM" address="722e" type="Y Axis" elements="16" scaling="RPM"/>
</table>
Alternate Wastegate Duty table does not need to be changed.
<table name="RPM" address="722e" type="Y Axis" elements="16" scaling="RPM"/>
</table>
Alternate Wastegate Duty table does not need to be changed.
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From: Dallas, TX
max/ alt baseWGDC
baseline / alt boost
Boost adder
Boost error correction
So i could get rid of TBEC, BCLO,BDEL?
Evolving Member
Joined: May 2008
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From: Dallas, TX