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Old 06-24-2009, 09:36 AM   #1
BigT
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Noob trying to use ECUflash to tune boost.

While i'm not new to tuning a turbo car, I am completely new to using ECUflash. I've read through most of what's posted on the other board in the ECUflash forum, but almost all of what is posted is for the evo 8 and 9. It seems that the evo X has a few more maps to mess with. So, please help an ECUflash newbie out and answer a few questions.

What do each of the boost maps do? ie. Boost Target Engine Load 1A 1B and 2, Reactive Selenoid Base WGDC map 1A 1B and 2, and the Passive Selenoid Base WGDC map 1A 1B and 2.

I'm trying to keep a few more psi up top but have absolutely no clue where to start. I've spent hours sitting on my laptop and reading, but have not come to any conclusions just yet. Thanks for any help.
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Old 06-24-2009, 02:19 PM   #2
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Reactive solenoid is already maxed out at 100% from the factory at WOT, so you don't need to adjust that. The passive solenoid you can raise percentages (do all 3 maps the same) to get more boost.

The boost target engine loads are used for boost error correction - if you hit a higher load than the target, then it will reduce the reactive WGDC to lower the boost. Theoretically, it can also raise the reactive WGDC if you are hitting less load than desired, but since the reactive WGDC is already maxed out at 100%, it can't do anything. Also, keep in mind that the boost target engine load is the sum of what's in the table plus the boost control load offset. Stock, the offset is 80, so you add 80 to what's in all of those tables. As long as boost target engine load is set high enough, it shouldn't really come into play. Again, make all 3 tables the same.
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Old 06-24-2009, 02:57 PM   #3
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Yup, the hardest part of using EcuFlash is figuring out what the tables actually mean / do. Heres a quick stab at it:

BTEL 1a, 1b and 2
:
These tables are 3d maps that are Engine Load x RPM x Throttle Position. The Values in the cell are DESIRED target engine loads and work in conjunction with the load offset value in the Boost Control Offset table. At a very high level, this map is telling the ECU that if your at 3000rpm and you put the throttle down as far as it goes, to hit a desired engine load of 124 + the Boost Control Offset value. From a stock map this would be:

124+80 = 204

For a stock car, the load cell you hit is roughly equal to the absolute pressure you would see in the engine in kPa. 204 kPa = 29.5 PSI. Subtract atmospheric pressure from that (14.5psi roughly) to get the actual BOOST you would see in your boost gauge. In this case it would be roughly 15psi of boost.

To help you connect the dots, note that the 204 desired engine is then the value you could use to look up what ignition timing you should be running at that point. 3000RPM x 204 Load = 8 degrees of timing on the stock map.

Map 1a and 1b should be made identical though 1b is thought to never be called / used. Map 1 is used under "high gear" conditions. Map 2 is used under "low gear" conditions.

WTF does a boost solenoid do anyway:
This article has a pdf posted in post #1 that really details how solenoids work:
http://www.cobbforums.com/forums/showthread.php?t=32552

You may or may not need the info, but perhaps others that read this thread might. Its for subie's, but the theory and concepts hold.

Reactive Solenoid WGDC:
The evo contains 2 boost control solenoids. The reactive solenoid allows a fine degree of control since it has a 3d map, whereas the passive does not and is a 2d table. The reactive table is a duty cycle % x rpm x throttle % table. The higher the cell value (up to a max of 100% duty cycle) the more your solenoid is trying to remain open. When the solenoid is open, it is trying to shunt air / pressure AWAY from your wastegate actuator so that it remains closed, and thereby builds boost. If you look at the stock maps you will see that the reactive tables are maxed out at 100% from 2750rpm to redline. Tune this and the passive table to both get your boost up faster, and hold it longer.

Passive Solenoid WGDC:
The passive solenoid works (from a mechanical perspective) in the same way the reactive one does. The higher the duty cycle, the more pressure its trying to shunt away from your waste gate actuator. The key difference here is that its a single column of values. You can set a desired WGDC per RPM, but not per RPMxThrottle position.



Folks: If you see ANYTHING in error in the above PLEASE correct me. I'm hoping to add this to a FAQ i'm working on so not only will edits benefit this thread, but the FAQ as well.
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Last edited by flagg77; 06-25-2009 at 12:56 PM. Reason: Corrections from Bryan @ GST
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Old 06-24-2009, 06:12 PM   #4
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Quote:
Originally Posted by flagg77 View Post


Folks: If you see ANYTHING in error in the above PLEASE correct me. I'm hoping to add this to a FAQ i'm working on so not only will edits benefit this thread, but the FAQ as well.
The different # tables are for gear-based boost, and speed-limited boost, not knock.

Here is a section of a Ecuflash "how-to" I posted on EvoM many moons ago, it might help:

Boost Control:
-----------------------------------------------------------------------------------------

Base Wastegate duty Maps



This table is used to set your base turbo boost level off the first solenoid in the boost control system. It is based off wastegate (solenoid) duty cycle, TPS % and RPM. As you can see it is maxed out at 100% duty cycle at WOT from the factory

Base Wastegate Secondary Solenoid duty Maps



This table is used to set your base turbo boost level off the secondary solenoid in the boost control system. It is based off wastegate (solenoid) duty cycle and RPM.

Boost Target Engine Load Maps



This table is used for the boost error correction system to keep your base boost levels in check. It is based off a target load at TPS % and RPM

Boost Control Load Offset



This table number + the Boost Target Engine Load number = Target Load

Turbo Boost Error Correction



If the engine load is above or below the "Target Load" (see Boost Control Load Offset + Boost Target Engine Load tables) by a certain percentage, then actual wastegate duty cycle is added or subtracted depending on this table.

Boost Control RPM Crossover (Gear based)



This table is used to see the RPM/MPH crossover for gear based boost. In stock form, the GSR model does not take advantage of this feature (but can be tuned to do so). The MR model uses this feature to keep boost lower at approx 3000-5000rpm in 1st gear.

Boost Limit



This table sets the boost limit (fuel cut), based on load.

Boost Cut Delay Timer



This table tells the ECU how long the ECU will let the car be above the "Boost Limit" before it cuts fuel. 1000ms = 1sec

Last edited by razorlab; 06-24-2009 at 06:17 PM.
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Old 06-24-2009, 06:36 PM   #5
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Quote:
Originally Posted by bryan@GST View Post
The different # tables are for gear-based boost, and speed-limited boost, not knock.
I know that this is what it's for, but could you elaborate on which table number is which?

That is, is it set up like:

1a is used below the crossover point
1b is used above the crossover point
2 is used only on Thursdays after 1:30PM
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Old 06-24-2009, 06:46 PM   #6
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Quote:
Originally Posted by xPRimNT View Post
I know that this is what it's for, but could you elaborate on which table number is which?

That is, is it set up like:

1a is used below the crossover point
1b is used above the crossover point
2 is used only on Thursdays after 1:30PM

+1...???
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Old 06-24-2009, 06:47 PM   #7
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Thanks for the tips so far guys. You've been a great help.
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Old 06-24-2009, 07:46 PM   #8
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Quote:
Originally Posted by xPRimNT View Post
I know that this is what it's for, but could you elaborate on which table number is which?

That is, is it set up like:

1a is used below the crossover point
1b is used above the crossover point
2 is used only on Thursdays after 1:30PM
#1 is used for high gear

#2 is used for low gear

crossover point is governed by "Boost Control RPM Per MPH Xover (Gear Based)" table and the number inputted there is based on gear ratio
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Old 06-24-2009, 07:58 PM   #9
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Great, thank you.

So, is "a" and "b" similar to the temperature maps? That is, a warmup map and one that is at temperature?

I understand the gear based boost control, but never really knew which map was actually being used for low versus high gear. Thanks for the input!
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Last edited by xPRimNT; 06-24-2009 at 08:08 PM.
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Old 06-24-2009, 09:57 PM   #10
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Thanks Bryan, exactly the kind of smack down i was looking for

I thought i had that squared away but obviously i missed something. I knew the xover point stuff but thought that was between 1a and 1b.

+1 on xPRimNT's question then from me!

ps: i've edited my post a bit for now,more later.
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Defi Boost Gauge // UEGO WB
Synapse DV // HKS IC Pipes // CP-E HFC // ETS V2 Catback
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