Okay, anyone who knows me can tell you I like to prepare myself and read everything I can before starting a new project. After much reading and much deliberation i am going to take the plunge here in the next few days and try my hand at setting up my 2bar SD tune. Since I have off work until the 8th, this should give me the time i need to get the tune some what close (I hope)... So what I am looking for now is anything from you EFILive guys (or those familiar with EFILive) with any suggestions or personal helpful tips that may be useful when doing this. It is my understanding that i will be using a few more tables to better control timing and fuel. I will have an added spark table that will reduce timing after i reach the 105kPa level, as well as an added VE table to help control fuel after 105kPa. So one of my questions is once i have this set up according to the tutorial, whats my next step? Can i then do my auto VE tuning if i richen up the new expanded (boost) VE table? Do i go back to my original VE table and fix the 105kPa column i was using to compensate for the boost region? Basically, what i am asking is once i get the new OS loaded and populated with preliminary data, whats my next step(s) to get the tune dialed in? Once i get started, be prepared for questions overload.....LOL... Just trying not to blow my engine up....yet.....

ALSO: Can i revert back to my old tune (non COS) after the 2bar MAP sensor is in if i run into problems? Or will i need to put the 1bar sensor back in?

 

well, I got my autoVE tune setup and ready to go as well as my autoVE Map. Just a matter of installing the 2bar sensor and flashing it in. Still looking for any tips anyone can offer. Been doing a bunch of reading about this and there seems to be a bunch of little things not mentioned in the tutorial that I am trying to put together here so I have as little down time as possible. I will let you know how it goes. There still seems to be a few bugs in the 2003 COS3 according to a few people so I am considering going with a partial SD tune and just having the MAF fail over at around 8000hz instead of 1hz. Also, if there is anything i need to do to the tune aside from what the tutorial lends, please let me know.

 

From what I have read ( I've looked into 2 bar, even bought the sensor) you cant go back to 1 bar without swapping the sensor back. It works on a different voltage signal that the PCM wont understand.

 

If you try to go back to a stock tune from a 2-bar tune you will need to change the sensor . If not the pcm will think it is only getting about half the MAP that it actually is. Either sensor reads about the same voltage scale of 0 to 5V but to the 1 bar it equals 0 to 105Kpa and to a 2 bar it equals 0 to 200 Kpa.

 

okay, so everything would need to be scalled at 50% if i went back using the 1bar, makes sense. Can i go about normal autoVE tuning once the 2bar sensor is in place and not worry about hitting boost? I know autoVE tuning with the 1bar sensor is a no-no in boosted applications because if you go into boost, your not going to get the fueling you need with the MAF disabled. Using the COS3 with the extra VE (Boost) table (A0009), that shouldnt be a problem. Assuming I have that (A0009) table populated correctly, right?

 

Yes and No. It's a bit more complicated than just scaling it back 50%. If you're using the VE % units in the VE table, doing that would leave you VERY lean. If you change units to g/cyl, then you could do that. You'll also likely run into harder starting and have to adjust the MAP offset to allow you full resolution into lower kPa regions. Advice would be to only use COS3 with the 2 bar sensor installed, and use either COS3 or stock with 1 bar sensor installed.

And yes, assuming that you've taken the 105kPa column from the normal VE table and populated the 105kPa column of the boost VE table, then filled that out to the 285kPa column, you will have no problem running in boost in SD mode. That's the big perk of being 2 bar. I'd work my way into boost though. Start out ve tuning the lower load regions and work your way up into boost progressively. Do it this way so that you can spot and lean trends and fix them before something breaks.

 

Justin is the boost VE table filled out to 285 Kpa or 205 Kpa on a 2 bar tune? Typo ?

 

I prefer ju to fill out the whole table. Fill the 105kPa Column, copy to the 285kPa column and increase that column by 180%, then fill linearly from 105 to 285.

 

here is a shot of what my preliminary boost VE table will look like.

 

That looks descent to me. What I like to do is set my PE table to 14.7 all the way down and then set the B3647 to something like this. This has a little lean cruse built into it, but you don't need to do that.

One VERY important thing you need to do that's not clear in the tutorial, is to set the table to 14.7, NOT 14.68 or 14.63. If its 14.68 or 14.63, it will use short tern fuel trims to adjust fuel and you won't get an accurat BIN map.

I also like to do some quick short logs creeping into boost to get an idea where the boost VE table is wanting to be and set it close to there only a tad richer, then do a long log with lots of cell counts to get good averages. No since in doing long, overly rich bin number logs when you can do short ones and get close and save a lot of time.