The Best Wideband Gauges (Review) in 2022 (2023)

FAQs

What wideband to use with HP tuners? ›

The 30-0334 X-Series OBDII Wideband Gauge is validated to work with HP Tuners VCM Suite! The X-Series Wideband AFR OBDII Gauge includes an OBDII pass-through connector and Bosch 4.9LSU sensor that can be free-air calibrated or used with the factory resistor calibration.

We use Bosch 4.9 LSU sensors in our wideband controllers. Our sensors are individually laboratory-calibrated by Bosch and never require free air calibration!

-At idle or a steady cruise, it is normal for your gauge to display an AFR value of 14.0:1-15.5:1 or 0.95-1.05 in lambda. -A naturally aspirated motor under high load will target an AFR value of 12.5:1-13.3:1 or 0.85-0.91 in lambda.

You need solid data to tune your engine right.

A wideband o2 sensor gives you the data you and your ECU need to be able to tune that properly. While a narrowband can only tell you when it's 14.7:1, and is therefore nearly useless for tuning for anything other than a steady cruise condition.

It doesn't matter. Think about it, you only have 1 map for both banks. You do have 02s for each bank that adjust both sides, but that is a multiplier based off of one table. Dual widebands would only really matter if you were emulating the narrowbands and keeping them there permanently.

Just like micrometers and dial bore gauges need to be calibrated on a regular basis, wideband O2 sensors must follow a consistent calibration regimen to ensure maximum precision.

AEM's wideband UEGO air/fuel ratio sensor kit includes a Bosch 4.2 LSU Wideband UEGO sensor, connector plug, pins and plugs, and mild steel O2 bung.

Best performance for most vehicles is in the 12.5 to 13 AFR range. Going too rich will have the opposite affect and decrease your performance.

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The 14.7:1 ratio is perfect for idling and light throttle cruising conditions as it's the most efficient mixture possible, meaning the best fuel economy and lowest emissions.

What is the best AFR ratio? ›

We mentioned the stoichiometric air-fuel ratio (14.7:1) that is the ideal ratio for lowest emissions, but this isn't the best ratio for power. It used to be that 12.5:1 was considered the best power ratio, but with improved combustion chambers and hotter ignition systems, the ideal now is around 12.8:1 to 13.2:1.

Checking your lambda sensor with a multimeter

When you start your engine, a reading between 0.4–0.6V should appear. Once the engine is up to temperature, the reading should alternate between 0.1–0.9V. The ideal engine speed for the best measurements should be at 2,500rpm.

On production vehicles it is common for these sensors to last for over well over 100,000kms.

Narrowband systems typically have lower data rate transmissions, whereas wideband systems support relatively higher data rate transmissions. To put simply, wideband systems allow for faster communication.

You could never tune WOT without a wideband and have any hopes of guessing your fueling 100% correct. You may be commanding 11.96 AFR but there is a good chance that that is not the true real time AFR that engine is seeing. The wideband is a must to dial in fueling.

A wideband sensor looks similar to a Narrowband but typically has 6 wires and a bulkier mating connector to the engine harness. It also needs rather complicated electronics to control the magic inside the sensor (while the narrowband signal can be read by a simple ECU input).

On aftermarket scan tools that lack this test function, you can use the following procedure to test the A/F sensors: Idle the engine for 30 seconds, then raise the engine speed to 2,500 rpm and hold steady. Watch the voltage reading for the sensor.

The wideband is connected to the pin on the ECU that the stock narrowband O2 sensor connects to. You can simply cut the stock wire close to the ECU plug and solder the Wideband O2 analog 0-5v wire to the wire coming from the ECU. Or alternatively you can utilize the stock O2 sensor harness.

Set the multimeter to the 1-volt range, back probe the O2 sensor's signal wire with a pin, and warm up your car for about five minutes. Connect your positive multimeter probe to the back probe pin, ground your black probe to any metal surface nearby, and check the multimeter for reading between 100mV to 1000mV.

We always recommend buying OEM parts instead of aftermarket parts. They are a safer bet. But, we strongly recommend it to anyone looking for a replacement oxygen sensor. These sensors serve an important role in ensuring the smooth operation of your engine.

Which O2 sensor is closest to the engine? ›

Sensor 1 is the sensor closest to the engine. Sensor 2 is the downstream oxygen sensor. It is always going to be located after the catalytic converter. Its job is to monitor the oxygen content exiting the catalytic converter in order to determine if it is operating efficiently.

Each oxygen sensor has its own unique characteristics specific to its application. One generic oxygen sensor that may appear to be the same cannot be used to replace a range of these specific oxygen sensors.

In a real engine, a 14.7:1 air-fuel ratio is a little too lean. To compensate for incomplete combustion, and to reduce NOx emissions, modern automobiles are tuned to run more rich, sometimes dipping as low as 12:1 or even richer during high-load situations.

So what is meant by a rich or lean AFR? A lower AFR number contains less air than the 14.7:1 stoichiometric AFR, therefore it is a richer mixture. Conversely, a higher AFR number contains more air and therefore it is a leaner mixture.

For optimum fuel economy 16-17:1 is usually best, leaner than that and the car will begin to misfire. Maximum power is usually found between 12-14:1, but this may be too lean for safety on many engines. For maximum reliability at full power, air fuel ratios from 10.5-12.5:1 are considered best, depending on the engine.

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A naturally aspirated engine, running on pump gasoline will normally make the most horsepower at an AFR of about 12.8 – 13.0. An AFR of about 14.6 will produce the best fuel economy.

​In the absence of other limiting factors, maximum engine torque occurs at about 13.5 AFR. Under wide open throttle (WOT) conditions, a richer mixture (12.5 to 12.8 AFR) is generally required to reduce cylinder head temperatures and avoid detonation.

Is lean or rich better for power? ›

A rich mixture is more common and not necessarily detrimental to your engine. In the case of a slightly rich mixture, you may notice reduced engine efficiency and worse fuel economy, but the rich mixture will generate more power and actually burn cooler.

The theoretical air–fuel ratio mixture for a gasoline fueled engine, for complete gasoline fuel combustion, the stoichiometric air–fuel ratio is about 14.7:1. In order to completely burn 1 kg of gasoline fuel, the combustion process needs 14.7 kg of air.

What they really detect is the ratio of oxygen to ideal oxygen for a stoichiometric combustion (the 9.8 AFR for E85 or 14.7 AFR for a typical E0 fuel). So if your AFR is set for Gasoline, it should read close to 14.7 AFR even if you are using E85 that is really 9.8.

8, the AFR of gasoline will be 11.76 and E85 will be 7.8. That's cool, but what else does it do? There are many other benefits to running E85 besides its energy output. For starters, it has an octane rating of 105 or higher and is incredibly resistant to engine detonation.

If the mixture contains too much oxygen for the amount of fuel (a lean mixture), lambda will be greater than 1.00. If a mixture contains too little oxygen for the amount of fuel (a rich mixture), lambda will be less than 1.00.

Unless you're shooting for emissions go as rich as needed to have reliable, solid idle. For light throttle cruising, you should be around 1.1 or even as lean as 1.2 with some engines - that'll give the best fuel economy and also minimise oil dilution, plug fouling, and other potential problems.

Use the sensor socket to tighten the O2 sensor to three-quarters turn past finger-tight, depending on the manufacturer's recommendation.

Narrowband systems typically have lower data rate transmissions, whereas wideband systems support relatively higher data rate transmissions. To put simply, wideband systems allow for faster communication.

You need the MPVI2, two credits, and downloading the VCM suite which includes the scanner and editor. The scanner is for data logging and the editor is for making changes to ECM. The two credits will allow you to do one vehicle. Cost will run you $400.

The HP Tuners MPVI2+ is similar in what it can do to the MPVI2, but with the addition of the “+” comes an array of connectivity upgrades. Most notably, MPVI2+ features Bluetooth 5.0, allowing support for select iOS and Android applications.

Can I upgrade my MPVI2 to pro? ›

Any existing MPVI2+ standard can be upgraded to a Pro Interface with a simple firmware upgrade and Pro Link (included with purchase).

Most vehicles require between 2 and 6 credits to license. Universal credits can be used for any vehicle we support, regardless of year, make, and model. Older MPVI units used brand-specific credits. Those credits are still valid and will be accepted if they have not been used.