Recommendations for pre-turbo WBO2 controller

[ptuomov]

Can anyone recommend a wideband oxygen sensor controller that would not destroy the sensors in a month and would allow for pre-turbo individual runner AFR measurement? Needs to do run a factory spec correct startup sequence for sensor heating. Also needs to implement the pressure correction using a separate sensor.

Never tried one, but AEM seems to have an unit.

Has anyone used anything that has been reliable?

[David Redszus]

Can anyone recommend a wideband oxygen sensor controller that would not destroy the sensors in a month and would allow for pre-turbo individual runner AFR measurement? Needs to do run a factory spec correct startup sequence for sensor heating. Also needs to implement the pressure correction using a separate sensor.

Never tried one, but AEM seems to have an unit.

Has anyone used anything that has been reliable?

We have used and sell the AEM unit. It works.

[ptuomov]

Can anyone recommend a wideband oxygen sensor controller that would not destroy the sensors in a month and would allow for pre-turbo individual runner AFR measurement? Needs to do run a factory spec correct startup sequence for sensor heating. Also needs to implement the pressure correction using a separate sensor.

Never tried one, but AEM seems to have an unit.

Has anyone used anything that has been reliable?

We have used and sell the AEM unit. It works.

Thanks, good to know. Does it do the pressure compensation internally or does a downstream logic step need to be added?

[ptuomov]

This is becoming timely again.

I looked at AEM website and I don't see their four channel controller there anymore. I was going to look into it more now that I am actually in a position of having to install some lambda sensors. I am thinking that that it would be a bitchin' setup to run a pre-turbo lambda sensor, pre-turbo pressure sensor, and a post turbo lambda sensor -- on both sides. If for no other reason, as a science experiment. But now the product no longer appears on the AEM web site.

[dfarr67]

https://www.14point7.com/

[Rick!]

http://www.ecm-co.com/product.asp?lcan

[ptuomov]

https://www.14point7.com/

Do they have a model that can do the pressure compensation for pre-turbo installations per Bosch LSU ADV spec?

[ptuomov]

http://www.ecm-co.com/product.asp?lcan

Do they have a version that uses the more temperature resistant LSU ADV sensor?

[ptuomov]

Just to clarify, ideally I would like find a controller that uses the Bosch LSU ADV sensor, heats it correctly at startup per the Bosch spec, comes with an exhaust back pressure sensor that can take pre-turbo heat, and pressure corrects the LSU ADV data per the Bosch spec.

[David Redszus]

Bosch provides such a controller: LT4 ADV for use with the LSU ADV.

The Bosch sensor LSU ADV has no trimming internal resistor and can handle a wider
temperature range: max 1030C deg.

Exhaust gas pressure will affect sensor accuracy. Within spec for pressures up to 36 psi:
higher pressures reduce accuracy.

Depending on sensor location, the exhaust pressures (pre Turbo) will consist of max and min
pressures often ranging from 40 to 65 psi, within one cycle.

Do you have exhaust gas temps and pressures (pre Turbo) for your application?

[ptuomov]

Bosch provides such a controller: LT4 ADV for use with the LSU ADV.

The Bosch sensor LSU ADV has no trimming internal resistor and can handle a wider
temperature range: max 1030C deg.

Exhaust gas pressure will affect sensor accuracy. Within spec for pressures up to 36 psi:
higher pressures reduce accuracy.

Depending on sensor location, the exhaust pressures (pre Turbo) will consist of max and min
pressures often ranging from 40 to 65 psi, within one cycle.

Do you have exhaust gas temps and pressures (pre Turbo) for your application?

Thanks. Currently, I do not have EGT or cycle average pressure sensors on the car when I am driving it. On the dyno, yes.

Let me explain a little more what I was planning on. I want to measure the individual cylinder lambda. I have cast-in bosses in the exhaust manifold for each runner stub, and those would simply need to be drilled and tapped. I would get the approximate pressure reading from the exhaust manifold but from the turbo inlet section, not individual runners. Although there’s variation in pressure and it’ll reduce accuracy, I think this setup of would be Informative. As reference, I’d also have lambda and pressure sensors in the down pipe, they already have been tapped and used on the dyno, too.

[ptuomov]

I can't get anything decent delivered these days, I don't know if it's covid or general incompetence.

In any case, because I was bit of a hurry and my old controller units are either not working or not here, I bought AEM 30-0334 gauge with an integrated controller just to finish tuning the cold starts and idle. Of course, turns out it doesn't come with the full wiring loom to data log from. As I am looking into the connector, it appears that the both the controller and the sensor/sensor heater are powered thru a JST 2mm pitch double row connector (http://www.jst-mfg.com/product/pdf/eng/ePUD.pdf) that takes in SPUD-001T-P0.5 pins for 22-26 AWG wire. Does it give anyone any pause that this connector has 3A current rating and they instruct connecting it to 5A fuse and then power the sensor heater thru it?

[Rick!]

Bosch LSU 4.9: 7.5W, H+ volts = 7.5V
Bosch LSU 4.2: 10W, H+ volts = 9V

NTK→good luck getting the right data from them

In my experience, the ceramics crack (due to thermal stress cycling and/or moisture impingment) and go open and don't short to ground.

[ptuomov]

Bosch LSU 4.9: 7.5W, H+ volts = 7.5V
Bosch LSU 4.2: 10W, H+ volts = 9V

NTK→good luck getting the right data from them

In my experience, the ceramics crack (due to thermal stress cycling and/or moisture impingment) and go open and don't short to ground.

I read somewhere that the maximum allowed current draw of then 4.9 sensor is about 0.5A.

Anyone got “AEM Electronics Inline Wideband UEGO Controllers 30-0310” in stock?

[David Redszus]

While a Lambda sensor accuracy can be affected by changes in pressure, I would be inclined
to ignore its effects. Changes in baro are very small compared to pipe pressures.

But the exhaust pipe pressures can be seen to fluctuate wildly, from cylinder to cylinder, cycle to cycle,
and even within a single cycle. So to, do Lambda values...IF the signal is measured at
a sufficiently high sample rate.

Small errors in Lambda are meaningless in the face of much large cyclic variations.

Perhaps of most importance is the pressure ratio across the valves during overlap.
Combustion which occurs in the exhaust header doesn't make much power but does
produce substantial pipe temps. And breaks things.