log boost with JDM MAP sensor (updated instructions)
May 5, 2010, 03:35 PM
#751
From the factory 1 bar to the JDM/X 3 bar.. are they visually different at all? I bought a used evo that had a fair amount of tuning and work done to it, so I'm curious to know whether I have the factory or the JDM sensor, before I go hunting to buy one. Thanks if anyone has both and can inspect, or knows another way to tell.
Jun 13, 2010, 07:11 PM
#753
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From the factory 1 bar to the JDM/X 3 bar.. are they visually different at all? I bought a used evo that had a fair amount of tuning and work done to it, so I'm curious to know whether I have the factory or the JDM sensor, before I go hunting to buy one. Thanks if anyone has both and can inspect, knows another way to tell.
If you look at the sensor you will see the part number on it. If it is a jdm\X sensor then you will read 1865A052 if you have the one bar sensor it is md305600.
The new ralliart also have the jdm sensor.
Jun 15, 2010, 12:08 AM
#755
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Jun 16, 2010, 05:36 AM
#756
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it shows something wrong... There is 30.9 psig everywhere when the boost present. May be i should change the formula in evoscan or something else?
Does anybody knows it?
Does anybody knows it?
Last edited by Nsk; Jun 25, 2010 at 11:54 PM.
Jul 18, 2010, 12:08 PM
#757
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JDM MAP Changes USDM Evo IX(88590015 )
When using ROM ID: 88590015 and trying to change all the values from the USDM to the JDM values:
0.51 20
0.90 40
1.29 57
1.68 78
2.07 97
2.46 117
2.85 138
3.24 158
3.63 255
I have an issue setting the some voltage in the tenth value. This is the closest Im allowed to choose. When trying to manually set the value; it defaults to the closest lower value;
0.51 20
0.90 40
1.29 57
1.68(1.67) 78
2.07(2.07) 97
2.46(2.45) 117
2.85(2.84) 138
3.24 158
3.63 255
How safe would it be to set it to the higher value:
0.51 20
0.90 40
1.29 57
1.68(1.69) 78
2.07(2.08) 97
2.46(2.47) 117
2.85(2.86) 138
3.24 158
3.63 255
I also have an issue seeting the MAP Comparison table. It only takes 14.5 or 14.7
Or is there a way to tweak it to the correct exact value: PLEASE HELP!
0.51 20
0.90 40
1.29 57
1.68 78
2.07 97
2.46 117
2.85 138
3.24 158
3.63 255
I have an issue setting the some voltage in the tenth value. This is the closest Im allowed to choose. When trying to manually set the value; it defaults to the closest lower value;
0.51 20
0.90 40
1.29 57
1.68(1.67) 78
2.07(2.07) 97
2.46(2.45) 117
2.85(2.84) 138
3.24 158
3.63 255
How safe would it be to set it to the higher value:
0.51 20
0.90 40
1.29 57
1.68(1.69) 78
2.07(2.08) 97
2.46(2.47) 117
2.85(2.86) 138
3.24 158
3.63 255
I also have an issue seeting the MAP Comparison table. It only takes 14.5 or 14.7
Or is there a way to tweak it to the correct exact value: PLEASE HELP!
Last edited by 23r0k001; Aug 11, 2010 at 08:25 PM.
Sep 9, 2010, 09:43 AM
#760
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couple small issues
I recently installed the JDM 3 bar in my 04 EVO (ROM ID 96420011). There wasn't an exact patch for my specific ROM, so I just used the 96420008 patch and changed the settings according to what mrfred suggested in his post. The logging aspect works great. I made the altitude corrections to the formula in EVOScan and I'm reading .0003psi with the engine off and key ON, which is pretty damn close in my book. 
The problem I'm having however is with startup and driveability.
When the car cold starts the RPM sits @ 2k for a little while, where previously it would drop down to 900ish right after start up. Not sure how long its sitting @ 2k RPM because I ususally start moving after I start the car, but I would guess a couple minutes or until the car is warm enough.
The next issue I'm having is with driveability. It seems at low RPM the car likes to buck now, and doesn't feel as smooth as it used to. Things are fine higher in the R's, but down low at slower speeds its def. not a smooth as it was before I changed the settings for the sensor. The last issue I'm having is that the car will drop the idle down to like 500 RPM sometimes when sitting at a light. It will feel like it wants to stall, and has done it once.
I know these issues have something to do with the patch/setting, and me not using the correct ROM, because before I did all that the car was super smooth with the V5.10. I was hoping someone could tell me what settings I need to adjust on the new MAP tables in order to fix, or attempt to fix it. Or atleast where I should start looking.
I can probably work around this by adjusting things not related to the sensor maps, but I'd rather not start messing with my timing & fueling maps in that area because I spent a lot of time previously on them before I changed the settings, and like I said the car was BUTTER smooth to drive previously. TIA for any help.
The problem I'm having however is with startup and driveability.When the car cold starts the RPM sits @ 2k for a little while, where previously it would drop down to 900ish right after start up. Not sure how long its sitting @ 2k RPM because I ususally start moving after I start the car, but I would guess a couple minutes or until the car is warm enough.
The next issue I'm having is with driveability. It seems at low RPM the car likes to buck now, and doesn't feel as smooth as it used to. Things are fine higher in the R's, but down low at slower speeds its def. not a smooth as it was before I changed the settings for the sensor. The last issue I'm having is that the car will drop the idle down to like 500 RPM sometimes when sitting at a light. It will feel like it wants to stall, and has done it once.
I know these issues have something to do with the patch/setting, and me not using the correct ROM, because before I did all that the car was super smooth with the V5.10. I was hoping someone could tell me what settings I need to adjust on the new MAP tables in order to fix, or attempt to fix it. Or atleast where I should start looking.
I can probably work around this by adjusting things not related to the sensor maps, but I'd rather not start messing with my timing & fueling maps in that area because I spent a lot of time previously on them before I changed the settings, and like I said the car was BUTTER smooth to drive previously. TIA for any help.
Sep 9, 2010, 05:50 PM
#761
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to hopefully help in figuring out my problem, here are the table values that were different in my ROM compared to the instructions.
instructions say:
MAP Test 4: Max Minus Min -- Change from 1.80 volts to 0.51 volts.
my ROM had the original value of 1.50 instead of the 1.80 above
instructions say:
"EGR MAP Offset #1" should read:
750 97
1000 86
1250 75
1500 67
1750 52
2000 56
2500 65
3000 63
3500 60
my ROM originally read:
1500 97
1750 86
2000 75
2559... 67
1364... 52
2559... 56
1373... 65
35 63
750 60
here is a screen shot for reference. modified ROM on the top row and original ROM on the bottom.
78309649.jpg?1284079536
I just noticed I never disabled the EGR test. I'm going to do that now and see if it makes a diff. I doubt it, but its worth a try.
instructions say:
MAP Test 4: Max Minus Min -- Change from 1.80 volts to 0.51 volts.
my ROM had the original value of 1.50 instead of the 1.80 above
instructions say:
"EGR MAP Offset #1" should read:
750 97
1000 86
1250 75
1500 67
1750 52
2000 56
2500 65
3000 63
3500 60
my ROM originally read:
1500 97
1750 86
2000 75
2559... 67
1364... 52
2559... 56
1373... 65
35 63
750 60
here is a screen shot for reference. modified ROM on the top row and original ROM on the bottom.
78309649.jpg?1284079536
I just noticed I never disabled the EGR test. I'm going to do that now and see if it makes a diff. I doubt it, but its worth a try.
Sep 12, 2010, 10:24 AM
#764
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I "think" I may have figured out how to fix my problem, or atleast part of it.
I noticed the RPM scaling was the part of my EGR map that was all screwed up, with that I guessed maybe the address for RPM wasn't right in the formula for my ROM. So I took the values in that definition and looked thru the ROM to find another RPM address that matched. Turns out the Baro pressure compensation table is similar in the number of elements it uses. So I just copied that address over to the EGR map tables. Using the Baro RPM address changed the RPM values on the EGR MAP to what the baro MAP was showing, but I just changed them back and modified the baro MAP values.
I also changed the defination in the ROM itself to point to the new address. Still haven't flashed the car with the new rom yet. Can anyone tell me if it might work or not?
I noticed the RPM scaling was the part of my EGR map that was all screwed up, with that I guessed maybe the address for RPM wasn't right in the formula for my ROM. So I took the values in that definition and looked thru the ROM to find another RPM address that matched. Turns out the Baro pressure compensation table is similar in the number of elements it uses. So I just copied that address over to the EGR map tables. Using the Baro RPM address changed the RPM values on the EGR MAP to what the baro MAP was showing, but I just changed them back and modified the baro MAP values.
I also changed the defination in the ROM itself to point to the new address. Still haven't flashed the car with the new rom yet. Can anyone tell me if it might work or not?
Sep 14, 2010, 07:16 AM
#765
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following up on my own progress here 
what I posted above with regard to the RPM address didn't seem to fix the problem.
Guess I'm left with two options here, remove the 3 bar, change back the code and just continue to log boost in LogWorks w/my GM 3bar, or switch to a more supported ROM for my VIII...
what I posted above with regard to the RPM address didn't seem to fix the problem.
Guess I'm left with two options here, remove the 3 bar, change back the code and just continue to log boost in LogWorks w/my GM 3bar, or switch to a more supported ROM for my VIII...
