Does anyone know why my afRatioEst is off the charts at idle? It's at the end of this log.

Thanks
Tony

probably because you have a bad VE value in there...

Run the adjustment tool and it is calling for 40.5% VE and your at 54% in the cell corresponding to idle... didn't you just say you dialed this in? in another post a few minutes before this one?

I don't see one place where your wideband and AFRatioEst are actually aligned...

What exactly have you done to dial this in?

rabenne said:

probably because you have a bad VE value in there...

Run the adjustment tool and it is calling for 40.5% VE and your at 54% in the cell corresponding to idle... didn't you just say you dialed this in? in another post a few minutes before this one?

I don't see one place where your wideband and AFRatioEst are actually aligned...

What exactly have you done to dial this in?

Click to expand...

That was the cruise log before I used the VE adjust tool. I think I figured it out. Do you have to rescale injectors when you switch from maf?

I thought it was better to have separate posts for two different questions but you're right, one would be best.

I can't think of why you would have to re-scale the injectors when going to SD. I didnt have to a couple weeks ago when I made the plunge. There may be cases where it is required.... so hopefully someone else chimes in.

Does the AFRatioEst parameter still peg to 21 after the ve adjust tool changes?

You don't have to rescale when going to SD. You should reset fuel trims periodically so you can get a new look at the values you are adjusting with the adjust tool. Sometimes the tool is close but not good enough for me so I play with the VE table until she runs smooth and then I interpolate the surrounding cells to make the graph "pretty". Just how I do it. I am firing up LINK here at work and will look at your log Tony.

rabenne said:

I can't think of why you would have to re-scale the injectors when going to SD. I didnt have to a couple weeks ago when I made the plunge. There may be cases where it is required.... so hopefully someone else chimes in.

Does the AFRatioEst parameter still peg to 21 after the ve adjust tool changes?

Click to expand...

I only did the adjust and loaded it. I'm open downpipe right now and one of my neighbors works third shift and don't want to piss her off. I'm going to my buddys after work so I'll post another log later. Thanks for the input.

1990TSIAWDTALON said:

You don't have to rescale when going to SD. You should reset fuel trims periodically so you can get a new look at the values you are adjusting with the adjust tool. Sometimes the tool is close but not good enough for me so I play with the VE table until she runs smooth and then I interpolate the surrounding cells to make the graph "pretty". Just how I do it. I am firing up LINK here at work and will look at your log Tony.

Click to expand...

Ok. I will disconnect the battery, take a log and post sometime later tonight. It seems to be running fairly well but it's open downpipe and it's freakin loud AF so hard to tell. Violently vibrates right under my at 4k but I haven't got on it yet. Thanks, Marty!

Tony, I would play with your deadtime until you get the STFT's within 5% plus or minus from zero. It is what I do for tuning, then move on. Get the motor up to temp (180*) and the O2 sensor cycling and the fuel trims will start displaying. Play with the settings and then look at what the STFT's are doing. Are they getting closer to zero or farther away? If they are getting farther away, move the DT in the other direction.
Give it a shot, and for me, an "est" is just an estimate anyway, so when the wideband is telling you the right numbers and the fuel trims are good, I really don't care what my estimates say. That's just me though and I am no pro, just gets me by.
Good luck and I will help if I can.

1990TSIAWDTALON said:

Tony, I would play with your deadtime until you get the STFT's within 5% plus or minus from zero. It is what I do for tuning, then move on. Get the motor up to temp (180*) and the O2 sensor cycling and the fuel trims will start displaying. Play with the settings and then look at what the STFT's are doing. Are the getting closer to zero or farther away? If they are getting farther away, move the DT in the other direction.
Give it a shot, and for me, an "est" is just an estimate anyway, so when the wideband is telling you the right numbers and the fuel trims are good, I really don't care what my estimates say. That's just me though and I am no pro, just gets me by.
Good luck and I will help if I can.

Click to expand...

I will do that. Forget which way the STFT went when I lowered it. It was idling rich 11/12ish so I lowered deadtime to 380 from 480ish. That got my idle afr to 14/15. Before this log, I lowered the VE idle area and it didn't seem to do much. I will play with both and report back. Thanks fellas!!

rabenne said:

probably because you have a bad VE value in there...

Run the adjustment tool and it is calling for 40.5% VE and your at 54% in the cell corresponding to idle... didn't you just say you dialed this in? in another post a few minutes before this one?

I don't see one place where your wideband and AFRatioEst are actually aligned...

What exactly have you done to dial this in?

Click to expand...

I will try lowering the VE to 40.5 and report back. Thanks, Rabenne!!

Tony, you can reset the fuel trims with the tab at the top.....

1990TSIAWDTALON said:

Tony, you can reset the fuel trims with the tab at the top.....

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Click to expand...

SaWeeeeeet!!

Think I'm ready to turn her up? What do you think?

I rescaled my injectors to get a global of -48.4, lowered deadtime and VE table for idle. Did a WOT pull and afr's close. Cleaned that up and loaded new VE. AFRatioEst came down once all the above was done. Will wot later.

Thanks for you help gents!!

Also, Are there any items that I should be capturing on my logs?

wherever WB factor deviates more than +/-3 is where you need to focus as you develop the WOT part of the SD table.

helps to setup your LC1 and AFRest as fat dashed lines in your log so you can easily pick up on where they drift apart as you go over it

21psi 16* 42lb/min on 93 feels niiiiice . Can't imagine what >25psi on E85 would feel like.