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Wideband O2 Sensor - AFR gauge

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gr3mlin
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Wideband O2 Sensor - AFR gauge

Post by gr3mlin » Tue Nov 09, 2021 10:10 pm

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

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Martyn
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Wideband O2 Sensor - AFR gauge

Post by Martyn » Wed Nov 10, 2021 9:38 am

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.

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Wideband O2 Sensor - AFR gauge

Post by Beedub » Wed Nov 10, 2021 11:26 am

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.
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gr3mlin
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Wideband O2 Sensor - AFR gauge

Post by gr3mlin » Thu Nov 11, 2021 11:21 am

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.

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Wideband O2 Sensor - AFR gauge

Post by pokeybritches » Mon Nov 15, 2021 3:07 am

Beedub wrote: Wed Nov 10, 2021 11:26 am 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.
Supercharged Z4 3.0i, 2x Supercharged Z4M

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Beedub
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Wideband O2 Sensor - AFR gauge

Post by Beedub » Mon Nov 15, 2021 8:17 am

pokeybritches wrote: Mon Nov 15, 2021 3:07 am
Beedub wrote: Wed Nov 10, 2021 11:26 am 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.
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gr3mlin
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Wideband O2 Sensor - AFR gauge

Post by gr3mlin » Mon Nov 15, 2021 9:15 am

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

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Wideband O2 Sensor - AFR gauge

Post by Beedub » Mon Nov 15, 2021 7:22 pm

gr3mlin wrote: Mon Nov 15, 2021 9:15 am :o - 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!!
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gr3mlin
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Wideband O2 Sensor - AFR gauge

Post by gr3mlin » Tue Nov 16, 2021 3:23 pm

Beedub wrote: Mon Nov 15, 2021 7:22 pm
gr3mlin wrote: Mon Nov 15, 2021 9:15 am :o - 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

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Wideband O2 Sensor - AFR gauge

Post by gr3mlin » Wed Nov 24, 2021 1:10 pm

Martyn wrote: Wed Nov 10, 2021 9:38 am 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.

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Wideband O2 Sensor - AFR gauge

Post by Martyn » Thu Nov 25, 2021 3:22 pm

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

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Wideband O2 Sensor - AFR gauge

Post by Beedub » Thu Nov 25, 2021 3:46 pm

Martyn wrote: Thu Nov 25, 2021 3:22 pm 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.
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Wideband O2 Sensor - AFR gauge

Post by Martyn » Thu Nov 25, 2021 3:54 pm

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

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Wideband O2 Sensor - AFR gauge

Post by gr3mlin » Thu Nov 25, 2021 9:35 pm

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 :evil:

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Wideband O2 Sensor - AFR gauge

Post by Vanne » Fri Nov 26, 2021 8:54 am

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.
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