2011 download

 

What do the top numbers on the chart represent?

 

Just like the XIED site says, stock ECM works fine. I am very happy with the XIED's on my '10 Ultra. Will be adding a SE 255 cam soon, that will really bring the engine package alive!

 

The ECM has no adaptability outside closed loop, in this example with only the head pipe swap it just happens to be rich enough at full throttle, this can and will change greatly with and intake/muffler swap

 

The AFR/Lambda tables are very similar and are calibrated to Stoich (14.6 AFR) in closed loop

 

Yes they do but not by much the AFR for the bikes with cats are 14.4:1 and the pre cat bikes were set at 14.6. They even run a litter richer in the higher rpms too. If I had a newer model I would not tamper with the converter the performance is not noticeable on a stock engine, the converter acts as a "stream straightener" smoothing out the turbulence of the exhaust gas as they flow thru the system. If you simply punch it out without enhancing the design of the inner header you change the flow capability. My only mod to the header would be a ceramic coating or wrap for comfort on long summer rides, i rode one and they are a little bit hotter for the passenger, but the converters are not evil.

 

Jamie, say a person had a SEPST w/vci and was able to record run time data including afr's/O2 readings would those readings be accurate or are those readings skewed? thanks.

 

VCI log data is very accurate as it comes right off the data bus, however it does not log AFR as the the nbO2 sensor is simply a switch that creates a voltage reference which is interpreted and used on the control side of the ECM. Logging VE is helpful as you can log "VE" which is written in the calibration as well as "New VE" which is a channel the ECM calculates/forecasts based on a combination of current VE, O2 integrator, and Adaptive Fuel Value (among others). The closer your VE and VE New logs match, the more accurate your tune.

 

I realize that this probably isn't what you meant, but I've seen it here enough that some people probably do believe it. The EPA doesn't mandate how lean the stock programs run. The EPA has emissions standards that have to be met, however Harley can meet those standards however they see fit.

Now back to your regularly scheduled thread.

 

Very good point, a good example would be in the automobile segment. While closed loop is Stoich (14.6:1 AFR) to maintain emissions standards and fuel regulations, transient throttle and areas outside of closed loop are as rich as 11:1 to prevent detonation on these vehicles