Hey guys,

I need a little help, Ecu boost control is new to me. I think I have the answer but want someone to dbl check my understanding of the process.

Currently peaking about 26psi but correction appears to be kicking in and making it rise and fall while the ecu is adjusting.

If you look at my logs and tune, this is what I notice:

1. load peaks at 278 while the BTEL is set for 260 (60 + 200 offset)
2. Ecu sees load is 18 over target and tries to lower boost by 5psi.
3. Actual boost drops 4psi and then rises again while ecu adjusts.

So, do I need to just adjust BTEL to 80?

Log here:

http://sites.google.com/site/tsitalo...edirects=0&d=1

Tune here:

http://sites.google.com/site/tsitalo...edirects=0&d=1

Thanks in advance guys!

 

Your boost offset is set at 60? Thats not right.

 

No boost offset is 200

 

It is doing it's job. You need to adjust the Passive Solenoid Base in that rev range to a lower value

 

Let me see if I understand your thoughts.

You suggest I lower the passive solenid DC so that it prevents the boost from spiking past the BTEL in the first place right?

But IF I wanted 26psi (and load of 278), then would I not simply adjust BTEL to 80?

 

Correct. Set your BTEL based on what load you see, assuming that your boost is set as you like based on your WGDC's. To make tuning easier at first, you can set your BTEL higher than what you expect to hit. Then log and make adjustments closer to reality, but just make sure you don't go overboard with the boost levels.

EDIT: Also, do you really need a 200 offset? That seems a bit high and makes it impossible to set the lower boost targets correctly (part throttle, etc). FYI, most people set the offset to 100. With an offset of 200, even if you have a "0" value in the boost target engine load table, you are really telling the ECU to try to push 20 psi approximately. The car can't do it, so it probably doesn't matter, but for most people, a 100 offset makes more sense.

 

Thanks LA!

As for the offset, these parameters were passed to me when I bought the boost pill, so, I'll stick with them for now. Car is almost right where I want it so I don't want to have to rescale all my maps right now

I'll play around here shortly and post my results, thanks again guys!

 

Not if you have " Total Upward WGDC Correction vs TPS" zeroed.

- Bryan

 

My BTEL is maxxed out @ 159.xx .... so the other way is then to increase boost offset above 100 ?

 

yes indeed.

- Bryan

 

Ah, never thought of that Is that something you would recommend doing? Honestly I haven't tried very hard to set my part-throttle BTEL, so it's probably correcting upwards. Is this something I should log/tune? I've only monitored to make sure I don't get knock at part throttle.

 

thx bryan, just getting to know ahead when i could increase my power !! hehhee

 

I was looking at your log and your PSI sure rises and falls a lot man. I mean from 26-22 back to 26psi.

Check out mine. (Now this is my winter boost setup)


Also at 5000ft too. 91oct

 

Yeah, I don't have my logs with me, but by adjusting BTEL I have got it ALOT more stable....

I only fall about 1.5 psi now, I am still fine tuning, I'll post up my results when I get done.

On a side note, I seem to be running leaner at high rpm. I am going to log IPW to see if I'm running out of pump. I believe that should be impossible on a stock car with TP and a catback with a K&N filter--Fuel pump relay was also replaced to newer version months ago...

Can anyone point me toward getting my Target A/F (in ecu flash) to match the Actual A/F (WB02)? They seem to be by a good margin. Scaling in ecu flash is 532. I know it down't really matter, I just feel more comfortable when there matching.

 

You won't get your AAFR and your MAFR to be same. That's why you use (DAFR X MAFR / AAFR) to get it to where you need it at in your maps load cell/RPM. One thing to do when tuning your boost turn Error correct off (copy and paste it somewhere and 0 it out) get everything where everything should be then turn it back on (copy it back into it) just be carefull when turning it off and do small changes when your just starting out with this sh*t.

Also on running out fuel I doubt it. I heard one guy say he had upgrade his stock fuel system.