Wideband O2 Sensor - AFR gauge

[gr3mlin]

Does the Z4M have a Wideband O2 sensor fitted as standard to be able to wire an AFR gauge to?

[Martyn]

It has a pair of wideband O2s fitted as stock, but you won't be able to wire a gauge in to them. You may be able to get something that reads the AFR via OBD2 though.

[Beedub]

i welded a boss into the S pipe after the headers. Be prepared to keep changing the sensor tho, they dont last long. I need to replace my again.

its very nice to keep an eye on AFR during WOT for long periods... a boosted s54 likes mid 11s-12 AFR ,


visible here in this very old video, ill be pulling my finger out next spring and releasing a proper video series on this car.

Roughly 2.05mins in

https://youtu.be/3UqwEp1U77s

gauge is a stack professional gauge using bosch lsu 4.9 sensor. This data logs back to a stack unit in the glove box.

this gauge was around 360gbp if i remember correctly.

[gr3mlin]

Thanks both,

I’m tempted to go for the P3 vent solution, can only have one read out visible at a time though . .

It’s a shame that the 3D design ashtray pod is NLA. I’ve got a spare ashtray though so might have a go at creating something with that so I can have the 3 separate gauges.

[pokeybritches]

i welded a boss into the S pipe after the headers. Be prepared to keep changing the sensor tho, they dont last long. I need to replace my again.

its very nice to keep an eye on AFR during WOT for long periods... a boosted s54 likes mid 11s-12 AFR ,


visible here in this very old video, ill be pulling my finger out next spring and releasing a proper video series on this car.

Roughly 2.05mins in

https://youtu.be/3UqwEp1U77s

gauge is a stack professional gauge using bosch lsu 4.9 sensor. This data logs back to a stack unit in the glove box.

this gauge was around 360gbp if i remember correctly.

Thermal shock is usually what kills the wideband sensors. The factory sensors won’t start heating up until the engine is actually running. An aftermarket wideband tied to an ignition-on power source will start heating up immediately when the key is turned. Moisture from a cold start contacting a hot sensor can severely shorten the life of the sensor. Additionally, check to see if the “nose” end of the sensor is angled down at least 10 deg, so that moisture drains out into the exhaust rather than pooling on the sensor.

Bosch 4.9 respond more quickly than 4.2 but seem to be less durable.

[Beedub]

i welded a boss into the S pipe after the headers. Be prepared to keep changing the sensor tho, they dont last long. I need to replace my again.

its very nice to keep an eye on AFR during WOT for long periods... a boosted s54 likes mid 11s-12 AFR ,


visible here in this very old video, ill be pulling my finger out next spring and releasing a proper video series on this car.

Roughly 2.05mins in

https://youtu.be/3UqwEp1U77s

gauge is a stack professional gauge using bosch lsu 4.9 sensor. This data logs back to a stack unit in the glove box.

this gauge was around 360gbp if i remember correctly.

Thermal shock is usually what kills the wideband sensors. The factory sensors won’t start heating up until the engine is actually running. An aftermarket wideband tied to an ignition-on power source will start heating up immediately when the key is turned. Moisture from a cold start contacting a hot sensor can severely shorten the life of the sensor. Additionally, check to see if the “nose” end of the sensor is angled down at least 10 deg, so that moisture drains out into the exhaust rather than pooling on the sensor.

Bosch 4.9 respond more quickly than 4.2 but seem to be less durable.

my stack unit actually counts down 20 seconds before it starts to heat the sensor which is a nice feature, however.... ill be lucky to get a year out the sensor, at over 100GBP per time, its a fair investment.

[gr3mlin]

- Not sure I can justify replacing a sensor every year!

[Beedub]

- Not sure I can justify replacing a sensor every year!

id rather this than my engine running lean and not knowing..... you have to pay to play!!

[gr3mlin]

- Not sure I can justify replacing a sensor every year!

id rather this than my engine running lean and not knowing..... you have to pay to play!!

Yeah, would def give peace of mind

[gr3mlin]

It has a pair of wideband O2s fitted as stock, but you won't be able to wire a gauge in to them. You may be able to get something that reads the AFR via OBD2 though.

Played around with DashCommand - Looks like I can get AFR from the OBD2 - PID CALC.AFR_ACTUAL. Not sure how accurate that will be vs a dedicated sensor & gauge though.

[Martyn]

You'll be fine with that! I use the stock WB when logging / tuning without issue.

[Beedub]

You'll be fine with that! I use the stock WB when logging / tuning without issue.

he wants real time monitoring, which would mean having a laptop in the car to view from those feeds.

[Martyn]

Dashcommand runs via an app on your phone etc so no need for a laptop, the data will be real time.

[gr3mlin]

Yeah, it’s a phone app.

I’m looking at getting an AvinUSA android screen (with torque app) to be able to display it / P3 vent gauge. Deals on both for Black Friday

[Vanne]

Both are nice cheap options, Byron has the proper setup which is what i would go for. 100 sterlin a year is cheap insurance. Not sure where the obd2 gets its AFR info from (its probably on the canbus, a mathematical calculation at best), but id like mine from a real time sensor.