Fracked Global

My global is absolutely retarded and I have done so much to try and figure out what might be causing it.
I have followed the guide of how to tune a 1g SD without a MAF and this is where I got.
Any guidance is greatly appreciated!!

https://www.dropbox.com/s/rcql60tjvb0lvp4/log.2014.10.15-06.elg?dl=0

Hello Bryan

Talk to me "Goose". What Injectors are you using and what is your Base Fuel Pressure at???

I did a quick review and you need to adjust your DT.

I have been using SD for a few years and could help you but we have to start with the basic.

Sorry if I ask this question but willing to help.

Ghislain

Thanks Ghis, the injectors are RC 1000s, I had them flow tested and they were rated at 930cc.
Base fuel pressure is at 37.5, and now realized I had planned to bump it to 43.5 before I left but forgot. Also should not I am running 91.

From what I had read my DT should be around 440, so I usually start around there (this is the third time I have done this) and my STFT usually zeroes out just under 100.

Appreciate the help, I am tempted to pick up some injectors from someone who has been running them and knows the stats so I can confirm that it's not the injectors or is.

You should just set your Global to -54.7 and tweek with deadtime.

I did, and my dead time ends up in the same place. When I start off at 440 my STFT is usually in the high teens, and doesn't get around 0 till under 100.

My global is where it is from doing WOT runs and running super lean.

How lean are you calling super lean?

Like my expect estafr is 9.3 and I am running low 12

Are you following this guide? This method has worked very well for me to get the injectors dialed in.

https://www.dropbox.com/s/41lbia8fw...20LINK%20with%20no%20MAF%20V1-3.pdf?dl=0

Yeah exactly, everything feels good but the numbers are just not matching in the global fuel and dead time

Try this;

First I would suggest that you return your SD Table to their original values.

Then input anywhere from 380 and 440 of DT and -52 of Global. That is where things "should be". Idle till operating temp then observe your AirFlow/Rev and adjust the Global only till you get about .25 AirFlow/Rev.

From there you could tweak your DT a bit but I recommend not to for the purpose of this exercise. If you still decide to change your DT by a bit make sure you do not change it by much; do not alter the SD while you are doing this initial set up. Consider these set up as your initial and from there do not change them. Changing them will make you alter your SD Table to compensate, then initial set up will have to be altered. You will get in that vicious cycle that most of us get into.

Once the AirFlow/Rev is where you are satisfied go for a drive and ONLY alter the SD Table using the Wizzard; SD VE Adjust (CombinedFT). Start by driving the car very slow through 30, 40, 50 km and on. That will help you to correct the SD Table for your set up. WOT once you are satisfied with the LTFT Lo and Mid.

Again do not alter your initial set up after you have chosen values that give you an Idle with cycling o2 signal and .025 of AirFlow/Rev.

Hope this helps.

Ghislain

Thanks Ghis, I will give this way a try once we return from vacation, this is definitely different than I have typically done it so hopefully will have some more luck.

Ghis, what if my STFT is -15 like it has been still leave the deadtime?

I would also suggest that you reset your FT after you Idle the Car.

Every set up is different and I would not expect my suggestion to yield a -15 STFT. If that is the case we'll look into it and go from there.

I know that you have been here for a while and that you are no "Spring Chicken" but think that starting from scratch using basic set up will either yield good results or will point toward a certain direction.

Again; use this as a basic exercise. We more than often go into a complex direction when the solution is simple.

Enjoy your vacation.

Ghislain

This here is where I learned to to do it. It's basic, but has yet to fail me.

Pretty much what I'm suggesting.

We'll nail this!!!

Ghisain

Bryan were you tuning your A/f's with deadtime and global before?

I was following the guide that Jason has posted.
Set what you think it should be, let the car warm and idle, then adjust deadtime to get STFT close to zero. The when WOT I used global to line up my est afr with my afr

The link that Jason posted is the same one I used never did I read adjust the global or deadtime for WOT. The write up is pretty vague on WOT tuning. But its maxoctane for knock and VE for A/F's deadtime and global for idle tune. Atleast thats how I did it.

well looks like I will be adjusting my theory, maybe this why I struggle so much.

Different way to adjust but what I'm suggesting is to find a Global and DT that works. Adjust the SD Table to match the targeted AF and then adjust the Timing so it does not knock.

Jumping back and forth makes you chase your tail.

Ghislain

I could be wrong I intrepided as Global and DT as your base setting. Like base idle and base timing. Then use your maxoct table for knock and SD VE for Air/fuel. I can't remember if the wizard works for WOT. But I used it for cruise.

Yes Global and DT as initial or base settings. Second would be to use the "Wizzard" to tailor the SD Table for LTFT LO and Mid at first, then do WOT.

My suggestion is to find what works for him at first and do WOT later.

Ghislain

The wizard inside ecmlink is borderline retarded though.

Oh Ghiz I totally argee with you. Set the basic first. I Bryan was adjusting the wrong thing to achieve his result.

Stephan, the "wizard" is what was making me change my idle and criuse cells to high 70's!

remember the car is using more then 1 cell all the time anyway, varing an average of what ever cells it is, was and could be using.. so its not that percise.

This is why Im going back to Maf. Ill make just as much power, with half the effort. plus the wizard works much better with the Mafadjust.

But My tuning formula was..

Set Global and dead times for your idle and tip in.
and sorta let the wizard deal with cruise(where i was having issues)

then once you can drive around smoothly, thenn work on WOT

I use the formula New VE = Old VE(Current AFR / Desired AFR) for WOT. I set my MAxoctane a little rich, tune my VE table till my Afr and aAFR est are matching in my logs.. then lean out and add timing for more power.

Wizard works but one need to smooth "near" cells.

Again; the suggestion is basic and simple. Lets not guide him through 1000 different directions.

Also; lets take WOT out of this topic at the moment.

Ghislain

Yeah agreed with Ghis, I need to focus on my base tune first and then once I get that figured and good then we can discuss WOT.

And Stephen I agree I think I was just off on my understanding which would explain my frustration, hopefully this approach will give me some good results.

Hey Bryan,
How healthy is your fuel system? Can your fuel system hold pressure after pump shut off? Can you log/see FP while driving? I would look into that first before attempting to adjust in ecm link

That's the one thing I want to log and am not logging right now.
I think I may pick up a pressure sending unit and log it so I can confirm that pressure is rising correctly.
Fuel pressure kind of holds after it is off usually holds at 5 or 10psi, I may need to crack open my fuel filter and see if the filter need to be cleaned.

Well I went with what you had suggested ghislain and I was at about -37 by the time I was sitting at 25.

So either these injectors are a piece of sh!t and somehow they didn't catch that when they were tested.
Or I have a top secret air leak that seems to be impossible to find.

You got you DT to -37? To achieve .25 afperrev. Cause you should be moving your global.

Global to that, and my AFR was sitting at 11 the whole time.

Leave your global alone. Adjust DT to achieve .25

Sorry I typed should.. but meant shouldnt touch your global in the previous post.

Set your global as per injector size and fuel pressure then adjust DT to get afperrev to .25.

Ok will try that tomorrow, what if she is still idling pig rich after i do that?

Haha Terry, starting to look like a good idea!

LOL