Hi everyone,
First time posting here and I'm hoping you can point me in the right direction.
Stock '03 z06 long block, with Vararam & LG longtube headers. The headers moved the sensor about 12" further down and into the collector.
I have basic understandings of tuning but I'm definitely a rookie. I think the P0131 & P0151 errors that I've gotten on a few occasions are because the front O2 sensors warm a little slower when moved downstream. I've been told I could switch to rear O2 sensors because they warm up faster but I'm wondering if I can resolve this with proper tuning. Or perhaps I'll have to install the rear O2's (with necessary front/rear conversion harnesses).
I took the car out for a drive today. I mistakenly closed my initial log (cold->warm and light throttle), but saved and attached a log from later in the drive. Car was completely warm. Made a couple hard pulls but otherwise light throttle cruising. No CEL during the drive.
I found some information in another thread that MIGHT be relevant (but Gen4 engine) and I'm hoping someone can clarify this information.
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Typically with just headers you can lower proportional base airflow by 5 or 10 %, increase integrator delay airflow by 20 or 30 % and then reduce proportional limit down to 1.25 or so to clean up drivability... This is also if the O2's are half again or double further downstream than they were - like I said - everything effects these settings and will require you to log MAF airflow and either increase or decrease specific portions of these tables...
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I have long tubes on my foxbody swap and didn?t change any of the things you mention. If your o2 sensors aren?t switching, you probably have a vacuum leak. I was surprised myself how much a small 1/4 vacuum port threw my fuel trims off.
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