Running UEL untuned?

[Donbrz]

Originally Posted by 86Hiro

Which O2 sensor needs the eliminator plug? Mine has the CEL after I installed it

The extender needs installed with the O2 sensor closet to the overpipe

[FRSBRZGT86FAN]

Originally Posted by Rifle

One of the oldest FRS' out there, (first one in VA might I add), is at ~115k miles, 60k of them w/ an untuned UEL. Why? no idea but he's my buddy so I have to accept him lol.

No harm to do it. Won't get the 'performance' aspect of the header until it's tuned, however. And if you CEL comes on, say bye-bye to cruise control. Won't work until you clear the codes.

Honestly, at that point doesn't he feel the next step for a power bump would be a good tune anyway? That's the next logical step to get power out of the rest of the mods he may have

[Alltezza]

You'll be fine, since you live in FL you dont have to worry about emissions. So you can run without a tune. I'm sure your ECU will adapt. I ran mine for 200 miles before I got a tune.

[BRZach]

Originally Posted by Ultramaroon

This is not a classified ad. Your question and the answers have now become part of the vast body of knowledge that is ft86club dot calm.

ahh good to know

[tzbang]

I put that exact header on my car months ago and I haven't got a CEL yet. Car runs fine. I will get it tuned once I decide what time doing OFT/Ecutek

[BRZach]

Originally Posted by tzbang

I put that exact header on my car months ago and I haven't got a CEL yet. Car runs fine. I will get it tuned once I decide what time doing OFT/Ecutek

Great! Glad to hear! Gonna throw mine on with my over-pipe this weekend!

[tzbang]

Update - I now have the CEL :-( Man, that took ages to come on! About 3 months.

[steve99]

Originally Posted by tzbang

Update - I now have the CEL :-( Man, that took ages to come on! About 3 months.

It depends on lots of factors, including placement of second o2 sensor often aftermarket headers space the second o2 out of direct exhaust flow, type of driving you do , if you dont do much highway it seems to take longer to come on.

[tzbang]

yeah it wasn't until I went out on the highway for the second or 3rd time before it came on and gave me a fright.. until I remembered the cat

[Aztec]

Originally Posted by mrk1

Will it run, yes. Is it the correct thing to do, no. Are you getting your money's worth from your header, no. Best off containing your excitement however long it takes to save up for a tune. Why not look after your car.

@Chen have you gotten a tune for your header yet??

[Chen]

Originally Posted by Aztec

@Chen have you gotten a tune for your header yet??

To be honest I haven't been driving it much. But right now the car is at the dealer for a p0016 code. Before that the car ran fine without a tune.


For some backstory on my car. I was one of the originals (August of 2012) and the early models all had issues with that code, I thought I was lucky that it never came on up until 40k miles. The CEL isn't due to running an untuned car with a full exhaust.