I am trying to find out the following about the GM 3 Port tuning:

1. What WGDC Correction Interval do you guys use? With the pill I use number 1. But the GM 3 port is much faster. Should I use a slower correction interval?

2. As a general rule of thumb, how much lower should the WGDC tables be with the GM 3 port vs. a #65 pill? Is 10% lower a good strating point?

3. What TBEC values are you using in the TBEC table?

Thanks

 

I use correction interval of 1.

I would lower it 15% and see what it does. It is pretty sensitive so might as well start low and work your way up.

 

1. I use 2, but i think most people use 1.

 

I have had success on 1 and 2, lower the BEC percentages b/c the 3 port is a fast ****.

 

I had oscillation problems at 1. I'm actually using 3 for mine. 3 ms is so much faster than the turbo can respond it doesn't matter.

I pulled my WGDC to 40% across the board and inched it up until I got what I wanted. Set all the positive correction factors to zero (leave the negative ones) and see if you can get close to the boost curve you want. Then add in the positive factors. Once you add the positive stuff in you may start seeing oscillation. Tweak the WGDC to get rid of as much WGDC correction as you can and any oscillation should go away.

 

Hey Naji, I havent figured out where this WGDC Correction table is, but im running whatever it is stock, and it changes very quickly. Much more responsive than the stock BCS.

can anyone link me up to a thread, or let me know the address of the WGDCC table?



OOOOOHHH.... duh... thats the first table in the Turbo section. "Boost Solenoid" or something...lol. duh...
https://www.evolutionm.net/forums/sh...=288408&page=3
/post

this is what i came up with. Its the stockish boost curve on teh WGDC side, adn it doesnt overshoot the BDEL. If you add back in the boost adding on the TBEC, it will bost 20psi in 3rd-5th.

 

3 is not 3ms AFAIK. It's ~0.3 seconds. 3ms is 0.003 sec. FWIW..

 

Good Luck

 

Thanks guys.

One more question: What TBEC values are you guys using?

 

Then why the F do they put (ms) next to it in ECU flash?

I'm guessing its processor loops then? It only looks at boost error every x number of times it gets to that point in the code.

Either way, 1 was too fast for my car. I got a repeatable 3-4 psi oscillation. Changed it to 3 and it works beautifully.

 

I am using 0.2 sec. 0.1sec was too fast for me.

 

NJ, for now i run a baseline WGDC that hits boost where i want it and then use TBEC to help prevent overshoot and have very minimal if any under correction. I dont mind having a winter and summer BWGDC though. I will eventually be fine tuning it but i have used small, 1-2% for correction where boost is +- 1-2psi off

 

I dunno, Mrfred defined those tables, there's no name for one tenth of a second besides he said 1 equals ~0.08-0.1 sec... So he just put "ms" in there i guess. Better than nothing

 

this should get you started

also if your using load based boost, hook up your rom with mrfred ecu boost mods

 

I usually set the correction interval to 4 for the GMBCS

I usually see about 10% or so less WGDC needed, depending on flow mods.

The error correction table I use usually ends up something like this:

0
0.5
1
2
1
0.5
0
0
0
0
0
-0.5
-1
-1.5
-3.5
-5.5
-7.5