Jamie,

I don't see those drastic changes in boost with those small temp changes. Are you sure something else isn't going on?

can you post your WGDC table?

 

Unfortunately, there is no such table in the OEM ROM. We could make one though. :-)

The thing about more boost in colder temps is well known. MBCs require seasonal adjustment because of this. In general, the WGDC correction system will compensate for this. A table to make an air temp based adjustment to the baseline sounds cool, but we all need to keep in mind that the more code we add to the ROM, there will be fewer adjustments to the engine control in a given unit of time (i.e., the ECU will react more slowly) which is not good. Granted that we are talking about a tiny bit of code to add, but everything adds up.

 

Well what can be deleted to make more room

 

Disable OBD-II routines. I'll be looking into this soon.

 

i agree with the issue but with the correction table it is just a matter of a couple of pulls in the colder months and couple of pulls in the summer months. I personally dont have an issue flashing a winter/summer baseline WGDC but if you have customers if you can get both cold and warm pulls average them out and set the correction accordingly. That should work right?

 

double post

 

I personally hate fidgiting with the WGDC tables once, forget having to do it every season. In New England the Air Temp constantly is changing from extreme hot to extreme cold. I've had plenty of weeks where its snowing at the beginning of the week and by the end of the week its warm enough for a T-shirt, thats New England for ya.

Bryan, here is my current WGDC table but its far from done. Having the entire curve slowly lose boost as I try to dial it in as the engine compartment gets hotter is killing me. Target is 23-24psi.

 

Jamie, can you also post the boost curves if possible?

You do know that maxing the WGDC table at 6602 caps the WGDC past 6602 at whatever you have in that cell, currently 91%.

Have you tried it with the WGDC table every 500 rpm, more like it is from the factory?

 

off topic - but would this allow "ready" monitors to be a none issue anymore?

 

yeah i hear you. It is really annoying that the car literally feels different from night and day.

I agree with bryan you may want to raise your high limit to 7500ish. I know i need that granulation from 6800-7500.

Here is mine:

 

I have a question about this post. I know you already corrected youself in meaning it would subtract 10% and not add, but I have another issue.

I was under the impression that TPS vs WGDC correction limited that amount of correction that could be applied but it does not directly apply correction itself. If TBEC is zerod out YOU WILL NEVER HAVE WGDC CORRECTIONS MADE.

Is this not correct?

 

Yes it limits the amount of upward correction made, and yes you are correct in that it does nothing if you have the TBEC table zero'd out.

mchuang said he was about to turn TBEC back on, I noticed the load error in the logs and brought it up. Basically if he would have turned TBEC back on it would have been taking as much WGDC % out as he had in the 19.8 cell of the table.

 

Wow did not know that lol, i was still trying to figure it out. Thanks for explaining I guess that is why we 0 out -20 or the top half of the tbec because after you told me to correct it which i did, the negative error will never get corrected.

 

I will post some boost curve screen shots for you to see later. I know the rpm scaling is off because thats what I originally used on my alky map which was stuck at 100% from 6600rpm and up to hold as close to 28psi for as long as the turbo would allow. I will be rescaling it soon, don't you worry

 

Well, I got my car dialed in on the standard maps pretty well at 23-24psi, so now I'm gonna work on the Alt maps and see if I'm having the same issues others are having.

I did a quick pull up to about 5K and right at the end it triggered -.5% boost error correction. I then drove for a good 2 minutes before I did a real pull and the -.5% stayed in effect the entire time I was cruising between pulls and was still in effect when I started the 2nd pull, which made my boost levels a little low and forced positive correction immediately. Shouldn't it reset or something? While cruising I was pegged at -20% load error which is 0 so i understand that it won't re-adjust anything since its 0. Any way to have the BEC reset to 0% under a certain load for a certain time or something?