Open Header on Y7 NA
08-25-2014, 11:22 PM
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Open Header on Y7 NA
So my old mani had the notorious crack right where the o2 bung is; so I replaced it with a DC header; little did I know that the donut gasket was a 2 in, and I needed a 2.5 gasket for my new downpipe. So I ordered a new donut; but until that gets here, I'm running open header. My question is does running open header make your MPG extremely horrible? Cause this **** is going through gas like V8 ever since I replaced it. I have my primary O2 hooked up and the car runs fine, no idle problems; just loss of torque for obvious reasons.
08-26-2014, 10:30 AM
#4
Re: Open Header on Y7 NA
Assuming it's a real DC Sports header, the bung is right there near the collector. without an exhaust attached to it, you're getting a lot of oxygen sweeping backwards over the O2 sensor, which is confusing your ECU, and making it run rich as a pig.
08-26-2014, 10:58 PM
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Re: Open Header on Y7 NA
Ayy! lol probably all three honestly. I floor it more, and yeah there's no collector till I get that new donut and it is a real DC sport header and the o2 is right next to where the collector bolts up so yeah lol. It's an OBD2 in a 96 Sedan DX
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