Delco 16183082 resistor removal for wideband logging

[Charlescrown]

Hi I am trying to find the pic of the resistor on pin D8 that needs to be removed for accurate wideband logging. I believe from AI that this ECU has one and suggest I remove it for accurate logging.

[Charlescrown]

I hunted around and found this diagram for 11P from a previous post by VL400 and it's identical to one ECU I have here but my ECU is 16183082. I measured the resistor and it's 50K. Am I on the right track?

[antus]

The '3082 is an 808 style ECM, for 12P. It does not have the resistor to remove that the '424 has.

But you will want to check and calibrate your values. Most widebands give a fixed pattern on boot up so start logging then power it on. The manual for the wideband should tell you what voltages are output in the boot sequence and what AFRs that represents. Then you change the wideband AFR voltages in the tune and test again until it looks correct.

The 424 overview documentation for 11P shows the '424 location. It looks nothing like what you have there.

If you can link where you got that picture we can check the context, its possible there is benefit to removing it, but I don't recall needing too on my car with 12P.

[vlad01]

I recall the 808 had one going back to that discussion years back, but Ant has me 2nd guessing now. But I found with the 0-5v and the calibration, you can get it spot on anyway with no mods whatsoever. The key is to use both 0v and 5v in combo to scale in or out and also to offset up or down. Changing 0 and 5v in opposite directions scales the range, moving both in the same direction offsets one way or the other. A combo of both does exactly that, a mixture of scaling and offsetting and any amount of each.

So you can literally get it dialed in perfect just in the tune. I just did it by feel, but I am sure the maths people could calc exactly what values are needed to get the right result the first time, I'm too dumb for that, but I know with 99% certainty that it can be.


Also, that pic you posted looks 100% like an 808 to me, the hex screws and wrinkly solder mask is a dead giveaway. 305 and newer used torx screws and from 082 the PCB and tracks are much more modern and lack the wrinkly solder.

[Charlescrown]

Thanks for the reply vlad. I did remove the resistor and do think the wideband output is more stable than it was on other logs but that may be me wishing. Anyway it's gone and all still works and logs fine. I did a lot of research on the 0 to 5 volt scales and from what I can see it's now both the same wideband gauge and delco logger so I am happy thinking i"m on the right track. The newest issue is a noise as it comes onto boost. Not sure if it's mechanical in the turbo or being generated by rich exhaust gas. Had that before where a rich mixture was burning in the exhaust. Did a log today not moving but revved the engine to 3 grand and the fuel mix was rich up high so now it's time to put in many hours of logging and changes.

[Charlescrown]

Thanks for the reply vlad. I did remove the resistor and do think the wideband output is more stable than it was on other logs but that may be me wishing. Anyway it's gone and all still works and logs fine. I did a lot of research on the 0 to 5 volt scales and from what I can see it's now both the same wideband gauge and delco logger so I am happy thinking i"m on the right track. The newest issue is a noise as it comes onto boost. Not sure if it's mechanical in the turbo or being generated by rich exhaust gas. Had that before where a rich mixture was burning in the exhaust. Did a log today not moving but revved the engine to 3 grand and the fuel mix was rich up high so now it's time to put in many hours of logging and changes.
Hi antus It's on this site by VL400 and I'll have a hunt around to try and find it again. It was about 11P but as vlad said the pic is definitely an 808 and yes the later ECU is identical to the pic and not an auto ECU.

[antus]

Yeah I think the reason was different from the 808 types and the 424 types. I think the 424 was a lot harder to get in range without the mod, particularly for some wb02 types, and the 808 probably does have it and we probably did talk about it, and VL400 would have posted that picture but it affects things much less so you generally don't need to do it. I would not expect it to affect stability, that is usually more to do with the quality of the power and signal connections. But maybe there is something in the wb02 that likes it better that way. I have not done it in my car with 12P and an AEM wideband and it is working properly with just voltage calibration in the bin.

[vlad01]

That's a good point, some WB controllers might have a lower output drive current, so the resistor drags the voltage down more perhaps.

Just out of curiosity, I checked one of my tunes which still has the 0-5v settings from when I last used the WB. It's 10.10 and 21.50 to get the perfect 10 and 20 at each end of the sequencer.

[Charlescrown]

The wideband gauge I am using is a Chinese 30-300X and I compared the output to my Innovate and with the range settings I have for the logging their both displaying the same readings so I guess I'm lucky with that considering where it was made. I don't know much about what's what with the gauge outputs but can say the output did fluctuate a lot more with the resistor and is definitely more stable without it. It's gone now so theres no turning back.

[antus]

cool, sounds like a win