ECMlink 2g Wideband Problem, O2 Not matching ECMLink.

[NitroNomad6969]

New to ecmtuner, let's start with that. Goal is to beat the shit out of it daily winter driver. max effort abuse.

95 TSI

Just got the car, it was an absolute mess. this is my second 2g DSM revival. upgrades. 255pump/rewire, FP regulator, 850cc, 16g, 3'' exhaust, DSMLink V3.

Problem with my AFR not matching DSMLink. Car is running 9.5-10.9 AFR. I can't for the life of me get the car to lean out, even gone to the point of changing the target fuel trims 18-20. I've moved the sensor tried another sensor. Checked for boost and exhaust leaks. Linear wide band with adjustments. I'm using Innovate LM-2 datalogger as a wideband and have even/can/have adjusted the output voltages. wire to pin (I believe 75) rear O2. the wide band is currently in the front O2.

Cleaned the MAF, adjusted TPS, cleaned and cleaned. changing injectors. My ICA is not working properly (Waiting for replacement) I have taken it out and inspected. Tried scaling injectors differently with no or worse changes.

Standalone datalogger as an O2 so I did move the ground to directly next to the ECU no change. Getting power from the radio. voltage reading on DSMLink is exactly what it should be. Move ground directly to ECU case?!

I feel like DSMLink is ignoring the wideband. What setting and i missing here? Going to just throw up a few logs.

YOU WILL NOTICE THE LINEAR WIDE BAND MATCH BECAUSE I HAVE IT ADJUSTED TO MATCH BUT THE CAR RUNS 10.2 all the time. Plugs say the O2 is correct. The wide band LM-2 came off my drag racing bikes and never had any problems. Recalibrated the sensors multiple time with no change.

 

[Justin DuBois]

Are you running a stock Front o2 sensor? Does the car Idle, and go into open closed loop? Are the fuel trims adjusting?

It looks like you have a functional front o2 sensor, and in the idle area, the linear WB looks like it is recording 14.7

Now I see that you are running narrow band sim so never mind.

 

[NitroNomad6969]

Are you running a stock Front O2 sensor? Does the car Idle, and go into open closed loop? Are the fuel trims adjusting?

It looks like you have a functional front O2 sensor, and in the idle area, the linear WB looks like it is recording 14.7

Now I see that you are running narrow band sim so never mind.

Car idles but does idle pretty dang low and is grumpy when its not cold and not warm (Dies when sitting) A couple revs always settles it down at it sits at like 550-600rpm.

Was running a front stock O2 but stock/none = it wasn’t using it. fuel trims are making changes, but DSMLink is compositing for it. The real changes I get it to make DSMLink freaks out and starts changing long and short term trims and my MAF comp gets all crazy.

Linear was adjusted it match on that log but it definitely is running 10.5 in real life. Look at other log

 

[Justin DuBois]

Please create a vehicle profile, with all the relevant mods.

You have to turn off nb sim in order for the stock front 02 to work, you have your linear WB set to the rear O2 channel.

 

[NitroNomad6969]

i did a lil pull in 3rd but i unplug my laptop and it dint save the log.. this is my holding it at 2k rpm and a lil drive down the road. .04 knock blip in the boost ramp but its stable but you can tell the car is chocking fuel down. At high rpm its 9- AFR at WOT 4-9k rpm. What should i do to show you guys fuel corrections that counter product my desired effect.

 

[Justin DuBois]

What is your base fuel pressure? Are you running Gasoline, or E85?
You should zero out the MAF comp global scaler, and evey slider in the MAF Comp tab, and fix your fuel pressure and global fuel and dead times before making any MAF Comp adjustment.

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[NitroNomad6969]

What is your base fuel pressure? Are you running Gasoline, or E85?
You should zero out the MAF comp global scaler, and evey slider in the MAF Comp tab, and fix your fuel pressure and global fuel and dead times before making any MAF Comp adjustment.

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pump gas 91 no ethanol. base fuel pressure is 43psi with a boost reference regulator. injector data and the built in calculator in link seem spot on. I feel like an idiot now and that's why i have been so hesitant to post anything about this. I'm not ecmlink user but have tuned plenty of other things at significantly higher limits. totally different Sofware. I figured it out, I'm going to pull the plugs here in a min when it cools. the wide band is lying to me. ive always trusted it and its defiantly wrong. i focused on Voltage and learned my lambda on the wide band is wrong after logging it on itself. I was under the impression reading that i was total fine using the maff comp. ill 0 it out and start back on injectors. the car is just slow as f*** at 11psi.

 

[NitroNomad6969]

What is your base fuel pressure? Are you running Gasoline, or E85?
You should zero out the MAF comp global scaler, and evey slider in the MAF Comp tab, and fix your fuel pressure and global fuel and dead times before making any MAF Comp adjustment.

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Never mind.. time to start over. I might grab a set of 450cc and a stock pump and ragulator. Starting to wonder if I’m wrong about the pump outrunning the small regulator that’s on the car.

 

[Justin DuBois]

If you can't get your fuel pressure with vacuum hose attached down to 37 or less (engine running) then you have an overrun problem. 43 is a good base pressure without the vacuum hose attached.

 

[NitroNomad6969]

Never mind.. time to start over. I might grab a set of 450cc and a stock pump and ragulator. Starting to wonder if I’m wrong about the pump outrunning the small regulator

If you can't get your fuel pressure with vacuum hose attached down to 37 or less (engine running) then you have an overrun problem. 43 is a good base pressure without the vacuum hose

I just to the car to go get some gas, cleaned the plugs to try and get a fresh reading, still rich. When I took the gas cap off it had a violent amount of positive pressure in the tank. I definitely need to figure that out first thing.

 

[NitroNomad6969]

I have a fuel return line problem, I’m assuming a kink in the line, pump hanger and sending unit are new(used) but good. The adjustable regulator is making to much fuel pressure when the car is running. when I set the pressure with dsmlink none running (12v) it’s not over running 43psi. Starting the car (14v) the pump is over running and not responding to vacuum, constant 49psi at 650rpm. I ran the return line from the regulator to a gas can and the regulator is working fine. Running car had 35psi.

 

[Justin DuBois]

Yeah - Take a look at this sequence from my build thread when I replaced the fuel pump with stock hardlines: You may need to modify the the return syphon.

https://www.dsmtuners.com/threads/itflys-1gina2g.532766/post-153900745

 

[NitroNomad6969]

Yeah - Take a look at this sequence from my build thread when I replaced the fuel pump with stock hardlines: You may need to modify the the return syphon.

https://www.dsmtuners.com/threads/itflys-1gina2g.532766/post-153900745

Very interesting, I just pulled it all apart and yes that hole was small. I drilled it out and have control over the pressure. Thank you.

Yeah - Take a look at this sequence from my build thread when I replaced the fuel pump with stock hardlines: You may need to modify the the return syphon.

https://www.dsmtuners.com/threads/itflys-1gina2g.532766/post-153900745

Everything is responding as it should be expected, I 0 maff out and and jumped back to dead time. Now I can finally get some changes and get it dialed in. Thank you