I wasn't able to find these instructions anywhere in an "idiot-proof" version, so I thought it may be useful to share how these modifications can be done step-by-step. A big thanks goes out to JohnBradley, jcsbanks, and Ralph for their hard work in developing and sharing these methods.

2-Byte Load
Why?
This is a more reliable way to capture the true engine load being measured in the ECU than with the calculated methods used by EvoScan and Mitsulogger. This tutorial will address capturing the 2-Byte load via EvoScan.

How?
1.) Ensure that you have EvoScan v.99 installed along with ECUFlash v1.3.
2.) Next, update the ECUFlash XML file located at: C:\Program Files\OpenECU\EcuFlash\rommetadata\mitsubishi\evo\ 88590015.xml (or whatever Evo IX ROM ID you have)
using FrontPage or other XML editor to include the following two table entries so the code ends like this:

<table name="2 byte load high bit" address="3EE86" category="Misc" type="1D" level="1" scaling="uint16" />

<table name="2 byte load low bit" address="3EE8A" category="Misc" type="1D" level="1" scaling="uint16" />
</rom>

Save the changes.
3.) Open ECUFlash v1.3 and a version 15 ROM image. Scroll down to the Misc section and you'll see two new entries: "2 byte load high bit" and "2 byte load low bit."
4.) Enter 27458 as the value for "2 byte load high bit."
Enter 27459 as the value for "2 byte load low bit."
5.) Save the ROM file. Flash the ROM onto your IX and begin logging 2-byte load using EvoScan v.99.

************************************************** *****
FOR VERSION 13 and 14 ROMs, insert the following table entries instead of the ones shown above:
<table name="2 byte load high bit" address="3EE66" category="Misc" type="1D" level="1" scaling="uint16" />

<table name="2 byte load low bit" address="3EE6A" category="Misc" type="1D" level="1" scaling="uint16" />
</rom>

When you change the values in ECUFlash, the *stock* values should appear as:
high byte table value = 27169
low byte table value = 27168

FOR VERSION 8 ROMs (Evo VIII), refer to the following how-to:
https://www.evolutionm.net/forums/sh...d.php?t=272246
************************************************** *****

Lean Spool Disable
Why?
When in open loop operation, the factory ECU artificially leans the fuel mixture by about 1 full ratio point which can cause difficulty in tuning for proper AFR. Disabling "Lean Spool" will also allow for your map AFR numbers to more closely align with your actual measured AFR.

How?
OPTION 1
1.) Open ECUFlash v1.3 and a version 15 ROM image. Scroll down and expand the Misc section.
2.) Right-click somewhere within the Misc section and select "New Map."
3.) Click the evo9base tab at the top.
4.) Enter the map Name "LeanSpoolEnable"
5.) Select the Type as "1D"
6.) Enter the Address of "1281"
7.) Select the Scaling entry "unit8"
The form should look like this:

8.) Click Apply then OK

Now do the same thing to make a "LeanSpoolDisable" map that looks like this:


9.) Click the box next to LeanSpoolEnable and change the value to "48" (which translates to 1500rpm) and change LeanSpoolDisable to "48" as well.
10.) Save the ROM file. Flash the ROM onto your IX and begin tuning your AFR with a much more logical and predictable foundation.

OPTION 2
1.) Go to "boost enhancement (anti-lag) Stop RPM"

2.) Right click on it and select "edit map"

3.) Change the address to "1284", click apply, then OK

4.) Make both the "boost enhancement (anti-lag) Stop RPM" and the "boost enhancement (anti-lag) Start RPM"
the same. For example, set both to 1500rpm.
5.) Save the ROM file. Flash the ROM onto your IX and begin tuning your AFR with a much more logical and predictable foundation.
--------------------------------------------------

Here are the lean spool tables for the Evo 8 94170008:

------------
<table name="Lean Spool Start RPM" category="Misc" address="1680" type="1D" level="1" scaling="RPMStatLimit"/>

<table name="Lean Spool Stop RPM" category="Misc" address="1684" type="1D" level="1" scaling="RPMStatLimit"/>

<table name="Lean Spool Load Threshold" category="Misc" address="39A2" type="2D" level="1" scaling="Load8">
<table name="input value" address="63DA" type="X Axis" elements="14" scaling="RPM"/>
</table>

<table name="Lean Spool Trailing Time (Rich Side)" category="Misc" address="397A" type="2D" level="1" scaling="uint8">
<table name="input value" address="63DA" type="X Axis" elements="14" scaling="RPM"/>
</table>

<table name="Lean Spool Trailing Time (Lean Side)" category="Misc" address="398E" type="2D" level="1" scaling="uint8">
<table name="input value" address="63DA" type="X Axis" elements="14" scaling="RPM"/>
</table>

<table name="Min Temp for Lean Spool" category="Misc" address="167E" type="1D" level="1" scaling="Temp"/>

<table name="Lean Spool Enable Load Hysteresis" category="Misc" address="167C" type="1D" level="1" scaling="Load16"/>

<table name="Lean Spool AFR Mapping" category="Misc" address="39B6" type="2D" level="1" scaling="AFR">
<table name="base AFR" address="6400" type="X Axis" elements="7" scaling="AFR16"/>
</table>

<table name="Lean Spool AFR below Enable" category="Misc" address="1682" type="1D" level="1" scaling="AFR16"/>

<table name="Lean Spool Clip Value" category="Misc" address="1686" type="1D" level="1" scaling="AFR16"/>
------------

You'll also need to add this line to the "evo7base.xml" file:

------------
<scaling name="AFR16" units="AFR" toexpr="14.7*128/x" frexpr="14.7*128/x" format="%.1f" min="8" max="20" inc="0.1" storagetype="uint16" endian="little"/>

 

" the factory ECU artificially richens the fuel mixture" should read
"the factory ECU artificially leans the fuel mixture"

 

Excellent, one correction:

"When in open loop operation, the factory ECU artificially richens the fuel mixture by about 1 full ratio point which can cause difficulty in tuning for proper AFR."

Change to "artificially leans"

Sorry cross posted with the above. At least we agree

 

Thanks, guys. I've fixed the original post. (Duh) Forgive me, I'm totally jetlagged and am operating on 3 hours of sleep over the last 40 hours.

 

Is there some negative effect for disabling lean spool? It would seem that Mitsu wouldn't just put it there for no reason ...

 

Have the addresses for the 2-byte load been documented for the 9417008 Evo 8 ECU?

l8r)

 

This is only for your particular rom correct? Or can I use the exact same directions on my 94170014 rom?

 

Hahha yea the that id is all over the dam place lol

 

Awesome! Thank you for the write up!

 

Each Rom is different. The patch for my 05 Evo 8 Rom is different than the one posted here.

 

Just to check this means I can now use "Load MUT 2Byte MOD" in Evoscan?

What do I need to do to use the "RPM MUT 2Byte MOD"

Also to try and get our map back to where it was before lean spool was disabled should we lean out the fuel map about 1 full point at all RPM's that fall within the start and stop lean spool rpms?

 

You have to check your rom id first. The addresses are different in each rom. I have been trying to figure out how to find mine, but I am clueless and I have seen no one with my id.

 

my rom image is - 88590015, just as this how to documents.

 

good stuff...nice write up...

 

nice job.