spAdam

iTrader: (1)

The obvious answer is, of course, to use a wideband.

But here's where I'm at with this build. At this time, I'm just trying to get the new motor in and running, the stocker is puking more oil by the day due to shot rings. I eventually plan on running Neptune, but at the moment I'm going to use a chipped p28 I have lying around and get a decent basemap for it. The motor is a very mildly built b20 with a p8r head, so its not like I'm running on the doable edge of compression ratio or anything. I just need something to get me by for the break in period and maybe a couple months of light duty daily highway driving.

I've had my eye on plx's sm-afr for awhile, and that's what I'll most likely end up running when I get my engine management project going. The rub is that I currently have a spare project harness apart and have the chance to fully integrate the plx into it, in place of the stock narrow band. I like things that are fully integrated.

So my question is, if I install the plx and wire everything according to their instructions, will it work okay on the chipped ecu? I understand that I won't have any logging capability, but in the mean time I can use a gauge to at least monitor things and be able to know if my fuel pressure is good and so on. My main concern is if the narrow band output of the plx (properly installed of course) is truly compatible with what the factory ecu is expecting to see.

I've read around, compared the voltage profiles of the plx's output vs. the stock sensor output, and everything seems like it should work, at least on paper. Really looking for some more experienced insight though.

spAdam

iTrader: (1)

No one has any input?

GhostAccord

If you are using a chipped ECU you can set up the voltage scale in the software to match that of the WBO2s narrow band voltage output exactly. Or some software will allow you to use the full 0-5v wideband voltage output, using a different ECU input such as D12 (EGR lift) or D10 (ELD), to control the ECUs closedloop operation.

Mike Lowwryyy

Im not sure about PLX's capabilities, but Innovate's MTX-L wideband AND simulated narrowband is programmable... So you can match it nicely to stock scaling.

spAdam

iTrader: (1)

Cool. Thanks guys, that was the answer I was looking for.

I've kinda been looking at eh mtx-l too, I'm kinda undecided on which way I'm going to go.

GagnarTheUnruly

iTrader: (3)

Innovate widebands have the advantage of direct logging in Neptune. So if you're planning on getting Neptune that gives the MTX-L a pretty big advantage.

0HAMOTORSPORTS

Go with the MTX-L. It has both wideband and simulated narrowband programmable outputs, comes with a really nice gauge, and very quick/accurate response. You can use the simulated narrowband output to feed directly into your ECU's O2 signal input for the time being until you can get tuned. Plus you can use the MTX-L's serial output for direct serial logging into Neptune with your laptop. Win/Win

spAdam

iTrader: (1)

Price looks to be a little cheaper too. How is the longevity of the included sensor?

What about the cost of the replacement sensors? I know that some systems come with a sensor that I can replace at VatoZone for $40 and others are quite a bit more expensive.

This is going on a daily, so I'm not terribly keen on replacing my O2 twice a year.

Edit: They both come with the Bosch LSU 4.2, and are a stock VW application (available aftermarket for $50-75) so that is a non issue as far as deciding goes. Even though expecting reliability out of a VW part doesn't exactly give me the warm and fuzzies

spAdam

iTrader: (1)

So I was going to post up another wideband related thread but I remembered I had this one.

I ended up purchasing the PLX combo with the sm-afr/ DM-6 combo back in November. The deciding factor, honestly, was that the gauge is separate from the unit and is really thin so I can surface mount without a pod on my pillar that says "come steal me."

I just recently got around to finishing up my harness with the sensor wiring integrated and I have a couple of questions regarding the rest of the hookup. The narrow band hookup is easy. Grey wire from the sm-afr to C16 at the ecu (obd2b). I searched around all f'ing morning and didn't really find the answers I was looking for.

- There are three caps included with my kit, but the instruction sheet doesn't mention
them. I searched around, and not surprisingly, they are intended for noise
suppression. I found an old users manual that showed where to put them on the
gen1:



Do I need to use them with the Gen2? Anyone have any experience?

- Also, as far as the resistors for the O2 heater circuit, should I just run the resistors
from the heater control (C1) up to an empty socket in the grounded side of brown
distribution plug, or do I need to ground directly at the ecu (maybe A2 or A10)?