ECU Tuning on 2GS for Headers
06-10-24 | 01:53 PM
#16
Thread Starter
10th Gear
Joined: Jul 2023
Posts: 12
Likes: 0
From: MN
Well that's a relief. All I've been hearing is "If you get a header, you need a tune or you'll melt your pistons!" lol
Thank you for taking the time to type this stuff out. Google Fu is what I've been doing so far, but as I'm quickly finding out, I don't know what I don't know lol
One last question, if that's alright; I've noticed a huge argument in every forum I look for on the topic of whether or not you can delete the downflow O2 sensors and replace those with the wideband ones on catless headers, while plugging O2 sensor emulators into the original downflow harness. Would you recommend doing it this way, or would you drill a new hole for the wideband sensors?
Thank you for taking the time to type this stuff out. Google Fu is what I've been doing so far, but as I'm quickly finding out, I don't know what I don't know lol
One last question, if that's alright; I've noticed a huge argument in every forum I look for on the topic of whether or not you can delete the downflow O2 sensors and replace those with the wideband ones on catless headers, while plugging O2 sensor emulators into the original downflow harness. Would you recommend doing it this way, or would you drill a new hole for the wideband sensors?
06-11-24 | 12:49 PM
#17
Driver
Joined: May 2020
Posts: 83
Likes: 23
From: the Netherlands
No worries man, we're on here to help each other out
Yep what you are saying will work. Having no cat upstream of the wideband sensor is the important part though, otherwise it will mess up the readings. The sensor being placed a bit more downstream than what was intended from factory (compared to the original upstream narrowband) will be a bit detrimental to response times and accuracy, but I don't think it will be significant.
Drilling and welding a new hole for the wideband is the best option though, but not always an option depending on the skills available to you.
Another option I have ran on my own car for a while is that I just replaced the primary upstream o2 sensor with the wideband sensor. For this to work you need a wideband sensor/controller with integrated simulated narrowband output. You then use that output to replace the original narrowband o2 sensor signal and feed the stock ECU.
However after a while I was having some issues with my wideband I never managed to fully resolve (mostly due to lack of interest in fixing it) where it sometimes lagged out for a while and then recovered again. But since it was feeding the ECU with this data the engine would stall out when that happened.
No bueno but getting an aftermarket header was in my plans anyways so I got one with dual o2 sensor holes and was able to keep both the narrowband (for ECU signal) and wideband (for monitoring) pre-cat.
I personally don't like running fully catless because of the smell and I am too lazy to swap one back in for the yearly governmental inspection emission tests.
Yep what you are saying will work. Having no cat upstream of the wideband sensor is the important part though, otherwise it will mess up the readings. The sensor being placed a bit more downstream than what was intended from factory (compared to the original upstream narrowband) will be a bit detrimental to response times and accuracy, but I don't think it will be significant.
Drilling and welding a new hole for the wideband is the best option though, but not always an option depending on the skills available to you.
Another option I have ran on my own car for a while is that I just replaced the primary upstream o2 sensor with the wideband sensor. For this to work you need a wideband sensor/controller with integrated simulated narrowband output. You then use that output to replace the original narrowband o2 sensor signal and feed the stock ECU.
However after a while I was having some issues with my wideband I never managed to fully resolve (mostly due to lack of interest in fixing it) where it sometimes lagged out for a while and then recovered again. But since it was feeding the ECU with this data the engine would stall out when that happened.
No bueno but getting an aftermarket header was in my plans anyways so I got one with dual o2 sensor holes and was able to keep both the narrowband (for ECU signal) and wideband (for monitoring) pre-cat.
I personally don't like running fully catless because of the smell and I am too lazy to swap one back in for the yearly governmental inspection emission tests.
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