WBO2 values inconsistent in MegaLogViewer? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 07-29-2016, 03:26 PM   #1
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Default WBO2 values inconsistent in MegaLogViewer?

Started my new engine today for the first time, also the first time using MS. The MS is MS2(PNP) built by braineack. I've 670cc EV14 injectors installed on the car, but besides that there isn't any changes in fuel/spark. Engine is much hated 1.6l with 1mm overbore 10.6:1 supertech and manleys. Also running bmw vTPS.

I'm almost certain that for some reason my used LC-1 controller is setup for narrowband and thus showing only 2 values, but haven't confirmed this and just wondering if someone more familiar with MS could analyze this. So, for my eyes/logic the AFR readings in different graphs(note the diagram below) seem inconsistent:




The AFR readings on the XYZ chart seem logical, but for some reason the readings on my LC-1 gauge and MS dashboard are not showing anything but 7.7 and 22.3 afr. I guess the possible narrowband setup is explaining this? Even though I bought this LC-1 from a guy who was running the gauge and a wbo2 sensor on his MS. The sensor is brand new 4.2 LSU, all the calibrations are made for LC-1/LC-2 according to braineacks instructions and only change I made in the tune was change REQ fuel and dead time from 1.0 -> 1.2. The engine started idling after the change on injector DT.

The diagram values just look a lot like narrowband changes for me, but I'm not familiar with ECU's or MS, so this is just based on some information I got from a friend/interwebs. I attached the log if some1 could take a look.

Sry for the quite possible confusing layout, I did have some beer since this is the first engine I've ever built and it WORKS(so far).
Attached Files
File Type: msl 2016-07-29_18.07.51.msl (96.1 KB, 21 views)
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Old 07-31-2016, 02:40 AM   #2
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Have you connected the right output from the LC-1? By default, the yellow wire (analog 1) is configured as a narrowband signal, the brown (analog 2) is wideband. This is opposite to how the LC-2 does it (which has wideband on analog 1 and narrowband on 2). It's possible the previous owner reconfigured it somehow, in that case just hook up a serial cable and make sure it has a sane config. RTFM here.

Also it is beyond me why anyone would buy a used LC-1 and a LSU 4.2 instead of a new LC-2 and LSU 4.9, but whatever. It still works, it's just not as good.
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Old 07-31-2016, 02:20 PM   #3
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Quote:
Originally Posted by jstck View Post
Have you connected the right output from the LC-1? By default, the yellow wire (analog 1) is configured as a narrowband signal, the brown (analog 2) is wideband. This is opposite to how the LC-2 does it (which has wideband on analog 1 and narrowband on 2). It's possible the previous owner reconfigured it somehow, in that case just hook up a serial cable and make sure it has a sane config. RTFM here.

Also it is beyond me why anyone would buy a used LC-1 and a LSU 4.2 instead of a new LC-2 and LSU 4.9, but whatever. It still works, it's just not as good.
I checked the LC-1 controller settings today with the program, and both outputs were setup for wideband outputs with the default WB settings(0V=7.35 AFR and so on). I also checked that showing some butane torch to the sensor gives readings in MS and the gauge. So I'm guessing there's just some weird programmed input in those Z cells there. I read some threads from other forums about the LC-1 warm up and I'm thinking that my wiring setup or just feature of the controller is causing the issue here. I got this controller cheap from a friend and at that time I wasn't planning on engine build or the 300whp I'm hoping, but already regretting the little money I spent on it. Probably changing it for a AEM X-series before turbo, or if the problem persists I will just get one and kill the LC-1 with fire. Also I only had the exhaust manifold bolted on the head, which might really affect alot here, but I've to test when I have the car back together. I don't like to idle it since the engine is just built and needs a break-in. Kinda worried actually if I don't get a reading while idling for few minutes, I can't continue the break-in.... LC-1 what a carbage.
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Old 07-31-2016, 04:05 PM   #4
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As long as your unit isn't defective, an LC-1 + LSU4.2 is far from garbage. Only been using an LC-1 on a different car a few years ago (before MTX-L or LC-2 came out) and an LC-2 now, but it seems to me the LC-2 + LSU4.9 kit is a bit more responsive and gives slightly more stable readings. Not sure how much of that is due to the controller (LC-1/2) or the actual O2 sensor (Bosch LSU 4.2 / 4.9). If an LC-1 is installed and works I wouldn't change it, but I wouldn't spend any money or effort on an older kit.

All O2 sensors need to be warmed up to work, that is not a property of the LC-1. Most sensors are heated (including all widebands I've ever seen) and heat up in 10 seconds or so, some old narrowband sensors are not heated and may require a couple minutes. The warmup time of the LSU4.2/LC-1 didn't seem longer than any other wideband sensors I've encountered.
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