Allan S
Simple African lad with a Rocket
Allan, how can the O2 sensor access outside air at any throttle position ?
The DP system is an add-on after the stock header, the O2 sensor is situated in the tail end of the Stock header.
As I think I mentioned to you in an earlier email, I have been getting help for my MAP from @Ulf Penner. He sent me a fantastic map for my setup that changed the way my bike ran completely- It was like fire had been breathed into it. To perfect it and get it ready for your exhaust system, we decided that I would put a PCV and AT on. I did the install really easily and used his map as the underlying map. We started the PCV with a zero map as the stock PCV ones weren't close enough to my setup and let the AT do its work. After a ride where the bike ran fantastically well I came back and checked the tables. I accepted the trims (a lot of which were very high 15-20) and rode again. This time there was spluttering and lumpiness at lower throttle settings. I came back , accepted the trim(high again- which should have warned me) . Next time I rode the bike was un-rideable. Stalling on pull off and black smoke and backfiring when It didn't stall- and beautiful at higher RPM and throttle settings. I sent the trims and tables to Ulf and after checking there were no leaks in the exhaust we zero'd everything and started over with a slightly modified base map and a zero PCV map- target table remained the same. Bike flew like a homesick angel.
I attached my laptop and ran the motor. Looking at the live PCV fueling reading on the right side, under Ulf's direction I blocked the right hand exhaust with a towel and watched the reading. It changed bigly; as soon as I removed the towel from the right exhaust it went back to where it was. That let us know that there was a change in the reading at the sensor when you prevented it from "seeing" the air that was sucked back into this very open system. We set the fuel table and trim table to zero then set all cells below 40% in the throttle opening columns on the target tables, forcing the AT to ignore readings at lower throttle settings and to rely solely on the map in the ECU. Have ridden about 1000km since and the bike runs really beautifully. The trims in the higher throttle settings are relatively modest and so I haven't accepted them yet. The plan is to get a good read over time at the higher throttle settings from the AT and then to extrapolate those trims back to the lower throttle settings at which time I may remove the PCV and AT.
Ulf Penner has been an invaluable help in getting my bike to run the way it does. I "swapped " bikes recently with another Rocket owner here for a few miles and he couldnt believe it was the same bike as hi. The difference is remarkable considering he has TORS and Ramair but no Penner map or PCV.
Right now I'm happy with how its running and a little disappointed in the AT performance but its not the sensor that is at fault. Power Commander help desk agreed with Ulfs assessment and suggested that perhaps moving the AT O2 sensor closer to the motor from where it is (although it doesn't look like it would fit easily) would probably help. I was thinking that probably around the bend in the middle of the DP crossover would be a good spot that would keep it out of the way and away from the opening of the right exhaust enough to make a difference and allow it to do its work properly.
What are your thoughts?