I was out today working on a base 93 octane map. Presently, I am using a GM 3-port in manual mode (have not yet implemented load or psi based control yet). What I am finding is that regardless of where I set WGD in the table, the log shows WGDC decreasing as rpm rises, and yes, boost tapers along with it (Omni MAP). I'm not sure why that would be the case. Now, I am assuming logged WGDC is determined from the ECU signal to the BCS. I would think that regardless of what is happening with the boost, the logged WGDC should be exactly what I specify in the table, but obviously, this is not the case (should be 75, not 58 at high rpm). What am I misunderstanding here?

Setup is in signature.

2nd gear WOT log and ECU Flash settings follow:

 

Unless am missing something, your WasteGate Duty Cycle is decreasing because you are surpassing your Desired Load.

Is LoadI?.. in your log, Load1Byte. Can't see full name.

 

"LoadM" on the log = 2-byte load (LoadMut2byte)

"159.4" is the max possible value in the "Boost Desired Engine..." table, and isn't a factor. But yes, I'd say that 418 load slightly exceeds that...

 

Since the rightside of your TBEC table is non-zero, you're not in manual mode. Your log shows that boost error is very high, so the ECU is pulling back WGDC. I'm actually surprised that it didn't pull back much more WGDC than what it did. You must still have the WGDC correction interval set to the stock value of 10. Zero the right side of the TBEC table, and the WGDC will exactly follow the baseline WGDC table.

 

Ok, that makes sense, thanks! Actually, I suspected that might have had something to do with it, and even made a map where the right side of the TBEC table is zeroed, but I wanted to consult you guys before I attempted it. I'll do that and drop the WGD values waaaay down.

As for the WGDC correction interval, where is that setting found, and what do you recommend? I ask because I am going to psi based control soon, so I am assuming that will be a factor.

 

Always good to start with low WGDC values. :-) The release version of the ECUFlash xmls only has a few ROMs with the correction interval listed. I think if you look in my psi-based boost control thread or my "boost control mods" thread, you'll find a definition for the correction interval (along with perhaps a few other goodies depending on your ROM).

I set my interval to 1. I forget exactly what that equates to in time, but my recollection is about 0.08 seconds.

 

Just so you know, the Boost Desired Engine Load + Boost Load Offset = target load

So currently yours is 159.4 + 100 so 259.4 target load.

Since you are actually hitting 400+ load I would recommend setting your Boost Load Offset to 300 and your BDEL table to whatever equals the load.

So an example (going off that log you posted) would be Load Offset at 300 and BDEL @ 110 @ 6000 rpm which would be 410 target load.

I would also recommend setting your additive correction vs TPS at zero.

Make sense?

- Bryan

 

Yep, now I remember. That mechanism (BDEL+BLO=TL) completely slipped my mind. So many things to remember.

Anyway, I made the changes and dropped MAX WGD way down, and will start over.

Thanks!