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Mazdaspeed Miata Wideband Install/Narrowband access and removal w/ Megasquirt MS3Pro
Hi all, I have some quick questions regarding installing the AEM Wideband sensor and gauge with Megasquirt MS3Pro in a Mazdaspeed Miata.
What is the best way to access the stock narrowband sensor? See the images below for my quandary.
Also, I have a Flying Miata Boost Gauge and wanted to know if I could attach the hose from the back of the Megasquirt to the nozzle on the multicomp pressure switch seen in the picture below:
There's a lot to address here... but I'll try and give you the best info I can based on what I believe you're trying to accomplish.
The upstream O2 on the MSM is notoriously challenging to get out even in optimal conditions. I've never actually done it myself, but every account of it that I've read involves lots of swivels and wobble extensions, even more swearing, and even then it's likely to break while you're taking it out. The "easy" way to get to it would involve pulling the turbo, which actually has its own "easy" way of being removed by pulling the entire exhaust manifold with it
That said, the instructions for the Megasquirt or your wideband sensor would advise that the factory location for the upstream O2 is way too close to the turbo for an optimal reading (I believe most state they should be at least 24 inches away). So I would skip removal of the factory sensor and look toward either adding a bung to the stock downpipe in front of the sensor, or replacing the downpipe altogether as most of the aftermarket ones have an additional provision for a wideband sensor.
Regarding the MAP sensor port for your Megasquirt, and the integration of the boost gauge with the FM signal modifier: Remove the signal modifier altogether from the car; it won't be doing anything at all with the MSPNP controlling things. My preference would be to tap the boost gauge line somewhere in the engine bay from a new source so the ECU MAP sensor has its own uncorrupted reading.
There's a lot to address here... but I'll try and give you the best info I can based on what I believe you're trying to accomplish.
The upstream O2 on the MSM is notoriously challenging to get out even in optimal conditions. I've never actually done it myself, but every account of it that I've read involves lots of swivels and wobble extensions, even more swearing, and even then it's likely to break while you're taking it out. The "easy" way to get to it would involve pulling the turbo, which actually has its own "easy" way of being removed by pulling the entire exhaust manifold with it
That said, the instructions for the Megasquirt or your wideband sensor would advise that the factory location for the upstream O2 is way too close to the turbo for an optimal reading (I believe most state they should be at least 24 inches away). So I would skip removal of the factory sensor and look toward either adding a bung to the stock downpipe in front of the sensor, or replacing the downpipe altogether as most of the aftermarket ones have an additional provision for a wideband sensor.
Regarding the MAP sensor port for your Megasquirt, and the integration of the boost gauge with the FM signal modifier: Remove the signal modifier altogether from the car; it won't be doing anything at all with the MSPNP controlling things. My preference would be to tap the boost gauge line somewhere in the engine bay from a new source so the ECU MAP sensor has its own uncorrupted reading.
Amazing! Thanks for the quick response. I have flying Miata's little enchilada kit installed (previous owner), and looking at the images on FM's website, I believe the exhaust has a bung ready for the wideband sensor. I will also remove the signal modifier. Thanks again!
08-22-2024, 04:58 PM
Mazdaspeed Miata Wideband Install/Narrowband access and removal w/ Megasquirt MS3Pro
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