I ran into an odd problem using PSI boost control with the 96530706 rom. While the WGDC baseline table works fine (switching gears, etc.), the boost error is almost always positive no matter what I set the boost target to. As a result, I get essentially no boost when I put non-zero values in the boost error adjustment table, since the ECU tries to "correct" my boost to a bogus error value.

Take a look at this log (2&3 gear pull without error correction turned on). The target boost is set to 23 psi (+14.7 PSI boost adder), but the boost error is always max positive.



Just to make sure it wasn't Evoscan logging wrong, I did turn on boost control and did a 3rd gear pull - you can see the ECU "correcting" the boost as low as possible (last column).



for reference, here are my settings and desired boost table:





any idea what might be causing this and how to fix it?

 

Looks like you boost adder is wrong. The scaling you are using is +7.4 so you can go to 32 psi on the boost map. That means your boost adder needs to be 14.7 + 7.4 = 22.1

Make that change and you should be good to go.

Read this thread that I posted so you will understand: https://www.evolutionm.net/forums/8092815-post1543.html

 

Thanks phenem - I have never used/edited map scaling before and did not realize it was there. Looking around in the ROM I went to the "Boost Desired Engine 'PSI'" table, then "edit" and "Edit Map Definition". Under "Scaling" it currently shows "PSIa8 OMNI4barMAP-Adj".

Since I never boost over 26psi, I don't need the extra headroom and would like to set my boost simply as "boost adder" + "target_value" = "total pressure" (using 14.7 as the adder since I'm at sea level and adding the desired boost value of 23 psi). In order to accomplish this, is all I need to do change the "Scaling" to "PSIa8 JDM3barMAP" in the drop down menu? Also, do I change just the one table or are there more I need to change to make this work?

Thanks again for all the work you put into this!

 

You need to match the scaling depending on the MAP sensor you have. I am using Omni4barMAP scaling for my Omni 4 bar sensor.

 

You're right, I missed that step. I'm using a JDM 3bar and the scaling in the boost adder and the target boost table were set to the Omni. After I changed it, all the values in the table updated to 12 psi for the boost adder and 12.7 psi peak for the boost target, which made my absolute pressure target 24.7 psi (~10psi boost), which is exactly what the ECU was trying to correct to -> mystery explained. Thanks everyone!

 

I have looked in various areas, I see scaling for JDM 3 Bar and OMNI 4 bar. Is there a specified scaling for the AEM 5 bar map? Or able to scale the AEM as a 3.5 bar etc?

 

I am quoting myself again, but it seems I also have accel/decel enrich/enlean problem as other USDM EVOs with 96530706 rom.

I tried possible solutions posted here and there in this forum (such as decel fuel cut delay), but no success yet.

What would be the difference between 05 EDM EVO and 03 USDM EVO hardware-wise?

I know all ISCV stepping motor unit and throttlebody part numbers are different between 05 and 03-04 EVOs, but is there any other hardware changes that might affect fueling?

 

If you are going to 9653 with an VIII 03 or 04 you need to make sure all of the tables match 9417 settings before attempting to tune anything. (The exception here is the Peripheries as they differ greatly....leave the 9653 peripheries as they are)

As for the gear based boost control, you need to make sure to set up the "RPM Speed to Gear" table properly.

0 6
43.3186 5
61.9912 4
84.6903 3
117.301 2
176.195 1
2899.78 0

"Main Map Wastegate Duty" for the 0 and the 6 gear columns should be all 0

Lastly, your MAP sensor must be set up correctly as well.

 

Boost control (using the JDM MAP sensor with PSI control) is now dialed in and working well for me, thanks for all the help everyone!

However, I've run into a snag with my idle: while the car idles fine in most situations (cold start, neutral, etc), whenever I clutch in and come to a (near) stop right after hard acceleration/braking, the idle momentarily drops very low (close to stalling).

Any ideas what table to tweak to fix this? My current (self-tuned) ROM is linked here if you want to look at stuff. Thanks!

 

Usually an indication of a boost leak unless you are SD too?

 

Hmm ... I'm not running SD, just PSI based boost control with the JDM3bar. Might be time to do a leak check, although I don't remember having this problem before I switched to v7. Still worth a try though - thanks.

 

here is a quick check of what is different, although it occurs to me you may be going lean or...

better send me you email, can't upload(?)

iscv and decel are a lot different

 

ralph(at)open-aerospace(dot)org - thanks!

 

here, try this;

https://docs.google.com/leaf?id=0Bz5...NDgwZTA4&hl=en

https://docs.google.com/leaf?id=0Bz5...MTA5NGUz&hl=en

https://docs.google.com/leaf?id=0Bz5...MTEyMGE5&hl=en

 

Anyone seeing an issue with the gear based boost crossover. No 6 th gear here, and I just copied what was in the 5th gear location to 6th gear? Same goes for the 0 column...? Does this function work strictly off of the speed to gear? I hope I dont need the MAT sensor upgrade. I am still on MAF. I assumed when i read the initial post by MFRED that it would run on the stock MAF.

Also, trying to tune and the boost error in my logs stays the same, -3.048...any thoughts?
The boost is registering, the WGDC is registering, I have verified the EvoScan deffinitons are correct, running out of thoughts.

My ROM deff is 94170715.

Thanks in advance.