I questioned why the fueling looks lean at low rpm after the mapping and got a very detailed explanation from the tuner: The reason the bike looks lean in the low down rev range on the graph is connected to the exhaust gas speed. On your bike, we have to measure the air/fuel using a pipe to connected to a pump to extract the exhaust gas. In an ideal world we would put a lambda sensor directly into the exhaust, but unfortunately on the cbr1000rr, the lambda bung is too small. At low RPM, the exhaust gas speed is low so when we log it, the reading looks lean. As the gas speeds up the reading becomes quicker and therefore more accurate. To get the fuelling spot on at low RPM we map the bike in steady state. This means the dyno holds the bike at a given RPM for as long as it takes to read to gas accurately, and then we make changes to suit. This method makes the low down RPM fuelling spot on, but unfortunately it isn't logged as the changes are made in real time. We also map all of 2 and 5% throttle in steady state, hence we don't have a dyno graph for those. This is the third bike they have tuned for me ... Absolutely lovely people and really do know their stuff. Highly recommended! http://www.fwdevelopments.com/index.cfm
Maybe you saw my RR5 trackbike as it was also being dynoed yesterday? Apparently it made 175bhp! Not got it back yet as I'm having a couple of other jobs done to it.
