Need INPUT Ecmlink LOG

[BadManGSX]

I just put in my new bluemax1250cc injectors. I also rewired my fuel pump, and added my wideband as well. I had to use a crazy high deadtime to get the thing to run as good as it is now. For some reason I can't get the airflowperrev to stay a steady .25.. it fluctuates as you will see in the log. Any input would great so that I can do another cruise log and get things better before going WOT.

*note*- My fans are on in this and makes my isc higher than normal. I have it set at -30 when no fans are on.

 

[Imback]

Looks fine to me. I would add some dead time cause it hit's the 9's. I would try to lower that temp if anything cause if your around 206-210 at idle i can only imagine were you would be at WOT.

 

[BadManGSX]

Yea.. I am making a custom coolant overflow. My problem lies in me not having one at the moment. I should have it all fabbed up today. It stays nice and cool around 186 while driving. It just needs a little air going through.

 

[Calan]

That's some pretty high deadtime, especially at the low end of the voltage curve in the InjBatteryAdj table. Have you logged your battery voltage to see where you're at under different conditions?

Those 1250's should have come with a test sheet from FIC that lists latency at several voltage points. On mine, I did some interpolation and transferred the times on their test sheet into Link as DT values, and they run great. Might want to try that...

 

[snowborder714]

The only thing I really find odd in that log is how your CombinedFT "cycles" from as low as -6 to as high as 10 (at a quick glance). You should take a look at the bottom of this wiki page and play with the adjustment rates to slow down the fuel trim adjustment rates.
v3narrowbandsim [ECMTuning - wiki]

I'm assuming you have the sensor installed downstream and not in the front o2 spot?


And in case you haven't seen the AEM page, it's worth checking out in case values aren't lining up between log and gauge.
aemwb [ECMTuning - wiki]

 

[BadManGSX]

CALAN... You make a good point. I did not understand the whole injector latency thing that was given to me on the sheet with the injectors. But I looked in ECMLINK and found where I could put those values so I will def. be making that correct.

SNOWBOARDER714.... I actually installed my o2 in the front o2 location. From the best I can tell the gauge reading and LINK reading are the same. Of course it is kind of hard to see if they are exact since the AF/Rs are jumping around so quickly at any given second. I will try adjusting the fuel trim rates and see what that does.

Thanks for looking guys! I will have to just keep playing with it to try and get it closer to where it needs to be. Should I lean out the fuel sliders any? Or save that for when I do WOT pulls?

 

[Calan]

Remember that global deadtime (on the fuel tab) gets added to the value at each voltage point in InjBatteryAdj. So the total deadtime at each voltage point should be roughly equal to the latency value shown on the test sheet.

Note that the voltage points in ECMLink and the test data from FIC won't line up exactly, so you'll have to do some interpolation. Also, this is just a ballpark value; each setup is different and it may not work in your situation. Mine happened to be almost perfect when using this approach, but YMMV.

 

[BadManGSX]

Awesome.. Thanks CALAN. I will be giving it a try tonight. We'll see what happens and I'll post another log.

 

[BadManGSX]

Ok. So I set my INJBATTERYADJUST to what my injector sheet called for and I got my dead time down to about 325. Seems to have more consistent combinedFT as well. I still need to figure out what values I need for the STFT adjustment rate (for idle). Other than that.. Still drives well under cruise conditions. I converted to a 2g timing map to have less radical advanced timing. I went ahead and lowered some of the values and went for a quick WOT pull. For some reason my cable came disconnected while doing it and it stopped logging, so I'll just post what I have. So what should be my next step? Fuel trim sliders? I am only running off the wastegate @ 13lbs with no loss through the whole rpm. I know I still need to lower some of the timing values for the random knock I am getting during some of the part throttle cruise sections. The actual "pull" is at the end of the log. THANKS

 

[Calan]

A few observations:

1. What fuel are you running, and what base fuel pressure? If you have 880cc injectors at 37 psi on pump gas, you should be somewhere around -49% on the global fuel correction; not -64%.

2. Either airflow, fuel, or both still need to be calibrated. You said you are only running 13psi of boost, but BoostEst shows something around 20 psi at peak VE.

3. Why is your MAF set to 3.5" GM? (and that is a bizarre looking MAFComp curve, even for a GM MAF).

 

[BadManGSX]

My current injectors are FIC 1250cc Blue Max ( I will have to update my mod list). Base fuel pressure is 37 psi with 93 Octane and I am running a GM 3.5" with the Ecmlink cable to ECU. I would agree in saying that the MAFCOMP adjustments are a bit crazy, but for whatever reason it is what ECMLINK gives me for a template to use after I log a long cruise.

After typing the first paragraph however, I am now sitting here trying to remember if I actually did a new MAFCOMP adjust after I dropped the dead time from my new injector latency input. My dead time went from an insane 725 to a much more reasonable 330. I know I went for a cruise after his adjustement with my open loop thresholds raised to have a new fresh log for MAFCOMP adjust but very well might have totally failed in actually adjusting it. That will be the next thing I will check, as I am sure MAFCOMP will probably be quite different. Would I be correct in saying this? Would this ultimately bring my "BOOSTEST" closer to my actual?

Thanks for all of your help. I do appreciate this! Unfortunately I was born and raised on carburetors!! I will get this! I understand the concept....just need help getting there for the first time.

 

[Calan]

My current injectors are FIC 1250cc Blue Max ( I will have to update my mod list).

DOH! I guess I knew that huh?

Unfortunately I was born and raised on carburetors!

Right there with ya. I built my first small block Chevy somewhere around 1981.

 

[BadManGSX]

Well I wasn't even a twinkle my mothers eye at that time haha. My parents were old school drag racers so I quickly got involved though. It doesn't take much talent these days to build a 400-500hp SBC. I wanted to do something somewhat challenging and build a high HP 4- banger. SO here I am....just need to get the whole ecu programming thing down haha. I'll get it eventually.