how-to: ECU-based direct boost control

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Jun 11, 2009 | 08:12 PM

#721

RoadSpike

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From: Sacramento, CA

Quote:

Originally Posted by RoadSpike

Here's my current scaling does this look correct to you?

<scaling name="psi16(5bar)" units="psi" toexpr="(x*0.3555) - 23.569" frexpr="(x + 23.569)/0.3555 " format="%.2f" min="0" max="60" inc="0.26" storagetype="uint16" endian="big"/>
<scaling name="psi8(5bar)" units="psi" toexpr="(x*0.3555) - 23.569" frexpr="(x + 23.569)/0.3555" format="%.2f" min="0" max="60" inc="0.25" storagetype="uint8" endian="little"/>

<scaling name="BoostErrorPsi(5bar)" units="psi" toexpr="((x-128)*0.088875) - 23.569" frexpr="((x+ 23.569 ) /0.088875) +128" format="%.2f" min="-10" max="10" inc="0.5" storagetype="uint16" endian="big"/>

Bump for a little love on the boosterrorpsi scaling

I'm guessing the others are correct but i really have no idea.

Jun 11, 2009 | 10:06 PM

#722

rolly1818

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From: Trinidad

Quote:

Bump for a little love on the boosterrorpsi scaling

I'm guessing the others are correct but i really have no idea.

are u trying to verify u got the right scalings?

if so, i can in the morning, i dont have my xmls on this pc.

Jun 12, 2009 | 09:42 AM

#723

RoadSpike

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From: Sacramento, CA

Quote:

Originally Posted by rolly1818

are u trying to verify u got the right scalings?

if so, i can in the morning, i dont have my xmls on this pc.

Yep but this is for a 5 bar sensor so its a little wierd

Jun 12, 2009 | 03:12 PM

#724

rolly1818

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From: Trinidad

Quote:

Yep but this is for a 5 bar sensor so its a little wierd

lol i am no help then

it should really be some adjustment calculation wise IMO. where there was the psi for a 3 bar=32psi. is should be replaced with the psi rating for your map sensor.

Jun 12, 2009 | 11:04 PM

#725

RoadSpike

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From: Sacramento, CA

Quote:

Originally Posted by rolly1818

lol i am no help then

it should really be some adjustment calculation wise IMO. where there was the psi for a 3 bar=32psi. is should be replaced with the psi rating for your map sensor.

Well that would be nice but if the bits represent 5volts i need to figure that out first

Jun 15, 2009 | 01:34 PM

#726

rolly1818

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From: Trinidad

Quote:

Quote:
Originally Posted by RoadSpike View Post
Here's my current scaling does this look correct to you?

<scaling name="psi16(5bar)" units="psi" toexpr="(x*0.3555) - 23.569" frexpr="(x + 23.569)/0.3555 " format="%.2f" min="0" max="60" inc="0.26" storagetype="uint16" endian="big"/>
<scaling name="psi8(5bar)" units="psi" toexpr="(x*0.3555) - 23.569" frexpr="(x + 23.569)/0.3555" format="%.2f" min="0" max="60" inc="0.25" storagetype="uint8" endian="little"/>

<scaling name="BoostErrorPsi(5bar)" units="psi" toexpr="((x-128)*0.088875) - 23.569" frexpr="((x+ 23.569 ) /0.088875) +128" format="%.2f" min="-10" max="10" inc="0.5" storagetype="uint16" endian="big"/>
Bump for a little love on the boosterrorpsi scaling

I'm guessing the others are correct but i really have no idea.

free bump for help

Jun 19, 2009 | 12:35 PM

#727

silex

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From: San Diego, CA

Is there a way to do ECU controlled boost with a GM 3bar MAP sensor?

Jun 24, 2009 | 03:46 AM

#728

shadow1

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From: Laurel, MD

Has anyone noticed that the highest value that can be entered for max WGDC is 127.5%? Does any value over 100% actually do anything more?

Jun 24, 2009 | 04:00 AM

#729

tephra

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From: Melbourne, Australia

Jun 24, 2009 | 10:42 AM

#730

GST Motorsports

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From: Hayward

Quote:

Originally Posted by shadow1

Has anyone noticed that the highest value that can be entered for max WGDC is 127.5%? Does any value over 100% actually do anything more?

100% is the max

Jun 24, 2009 | 11:14 AM

#731

shadow1

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From: Laurel, MD

Quote:

Originally Posted by GST Motorsports

100% is the max

Common sense dictates 100% is the max but I thought it was interesting that more than 100 can be entered. Question, do most folks using mrfred's method of boost control use 100% WGDC and peak boost targets in the low rpm ranges (500-2500)? I have my set up that way with an Ingersoll-Rand 3 port solenoid and I do not have any boost spikes.

Jun 24, 2009 | 11:19 AM

#732

GST Motorsports

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From: Hayward

Quote:

Originally Posted by shadow1

Common sense dictates 100% is the max but I thought it was interesting that more than 100 can be entered.

Yup. It is 100%, anything more doesn't do anything.

Aug 14, 2009 | 11:59 AM

#733

mrfred

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From: Tri-Cities, WA // Portland, OR

OMNI 4-bar compatbility added

The instructions have been updated to include the scalings needed to use an OMNI 4-bar for direct boost control.

Aug 14, 2009 | 01:49 PM

#734

rolly1818

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From: Trinidad

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 Alt Map:

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