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OBWB8m · wideband controller

It’s already talking to your ECU.

A wideband sensor on every cylinder, sent straight into the ECU you already run.

Find a dealerSee what it does
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OBWB8mPer-cylinder wideband controller

A wideband sensor on every cylinder.

Cylinders don’t always breathe alike. Small differences in injectors, ports and the manifold can leave each cylinder on a slightly different mixture. A reading from each one shows you which cylinder is off.

All eight readings go straight into your ECU over CAN.

Connects to

  • Holley EFIHP · Dominator · Terminator X
  • FuelTechFT450 · FT550 · FT600

Another ECU? Ask us. The list is still growing.

Close-up of the OBWB8m case: channel lights 1, 2 and 3 glowing green above a sensor connector. 3D rendering, interim.
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Every cylinder, seen

One sensor per cylinder, not one average.

A single wideband reads the whole bank as one number. When one cylinder runs lean, the others pull that number back to where it looks fine. With a sensor on each cylinder, a lean one has nowhere to hide.

Each channel has its own light on the case. Green means the channel is active.

The OBWB8m face-on, with four sensor lines coming in from each side and one line leaving it for the ECU. 3D rendering, interim.

Eight channels in. One line to your ECU.

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How it fits

Three parts. Nothing new to learn.

How it fits: eight sensors in, one line out to the ECU The OBWB8m seen from above, drawn to scale from its CAD model: a flanged case with a mounting hole in each corner, a large sensor connector on the left and one on the right, two round ports between them, eight channel lights in a row along the top edge and the power input at the bottom. Four exhaust runners on each side each carry a wideband sensor. The four sensors on the left run into the left connector as channels 1 to 4; the four on the right run into the right connector as channels 5 to 8. One cable leaves the right-hand round port for the ECU. The sensors and the ECU are not to scale. 12345678 ECU CAN OBWB8m sensors sensors
OBWB8m drawn to scale from CADsensors and ECU not to scaleinstalled photo to come

  1. A sensor in every exhaust runner.

    Each cylinder gets its own wideband sensor. The sensors plug into OberBuilt harnesses, so the sensor wiring goes together without crimping.

  2. It arrives set up for your car.

    The unit ships set up for your sensor type, your AFR units and your ECU.

  3. One cable to your ECU.

    All eight readings share one CAN connection to the ECU you already run.

rendering · interimgeneric ECU shownsimulated dataset

In the log you already keep

Your ECU sees every cylinder.

The readings travel on the CAN bus your ECU already reads, as its own inputs. Each cylinder’s lambda shows up where you already tune, and your logger records it the way it always has.

Installed photo to comeThe OBWB8m fitted in a real engine bay, wired to the ECU.
Diagram: a phone and a laptop join the OBWB8m’s own Wi-Fi The unit sits on the right. Wi-Fi arcs link it to a laptop and a phone on the left, each showing the unit’s page in a browser. its own page, any browser OBWB8m its Wi-Fi
diagram

Look inside from your phone or laptop

No app. No software. Just a browser.

When you want to look inside, join the unit’s own Wi-Fi and open its page on a phone or laptop. There is nothing to install.

On the bench, it can also record a log straight to your laptop.

More about the OBWB8m

Analysis EngineLog analysis for Holley EFI HP and Dominator

Got a Holley EFI HP or Dominator log? Find out what it says.

Tuning leaves you with a log. Export it as a CSV, upload it to the Analysis Engine, and it runs its checks, then lists what it found, each finding marked “Looks good” or “Needs attention”. Your log’s channels are there as charts, so you can check the finding yourself.

It reads Holley EFI HP and Dominator logs, with or without an OBWB8m on the car. Open by invitation from the waitlist for now.

See a sample verdictHow it works
A log goes in, findings come back with a chart A log file is uploaded to the Analysis Engine. It returns a findings card: one finding marked Needs attention, one marked Looks good, and a chart of the log underneath with the stretch that needs attention shaded. your log Needs attention AFR bank agreement Looks good
illustration · not a real finding
Analysis Engine findings list: AFR bank agreement, Needs attention, drift on the closing full-load pull; Fuel pressure vs boost, Needs attention; Knock activity, Looks good, 0 events across the session. Sample data.
real app screensample data

Where to get an OBWB8m

Find a dealer.

The OBWB8m is sold through dealers: five shops across the United States.

Find a dealer

Run a shop and want to carry it? Email support@oberbuilt.ca.

  • Autotrend EFIDiamond Springs, CA
  • The EFI StoreLake Havasu City, AZ
  • Redline MotorsportsBloomington, IL
  • Big 3 RacingWest Salem, OH
  • TNT Performance AutomotiveOwego, NY
The OBWB8m seen side-on at eye level, a thin line of light along its edge. 3D rendering, interim.
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Built in Winnipeg

Designed and built by OberBuilt, Winnipeg.

A small Canadian engineering shop. We make the OBWB8m and run the Analysis Engine, and questions about a fitment, an ECU or a log come to us at support@oberbuilt.ca.

Full specificationAbout OberBuilt