| Author | Message | ||
     Bombardier |
Was doing a little web surfing and found a site called RB Racing-RSR.com. They advocate that the O2 sensor should always be placed in the exhaust header from the front cylinder as it will be prone to running lean on closed loop because it runs cooler . I noticed on the American Sport Bike exhaust shootout that the O2 sensor is mounted in the front exhaust header as well. Is it tucked away in the rear header just for appearances or is there another reason I do not know about? Any takers? | ||
| Reepicheep |
Seems to me like the O2 sensor would just give you a reference point to allow the ECM to know where it is, and that pre-compiled models would be used to drive engine behavior from that information. So I think you would want the O2 sensor to be wherever the designers of your ECM expected it to be. | ||
| Blake |
I agree with Bill (Reepicheep). It sounds like some may be assuming that the front and rear fuel mapping is identical. It isn't. | ||
| Al_lighton |
The sensor bungs in the pipes in the exhaust shootout were located for easy access during tuning. We put the wideband sensors in those bungs to independently measure front and rear cylinder A/F ratios, since each cylinder is mapped independently. That is much more reliable than running copper tubes up through the muffler for connecting to the the dyno gas sample O2 sensor hose. Al | ||
| Bombardier |
I understand however the front map has a range of enrichment based on the head temp of the rear cylinder. If the rear cylinder gets hotter that allowed range then the front should start to lean out due to the rear wanting to reduce the amount of fuel to avoid an overly rich mixture. |
