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60wt:
Since you already have the XIED's you do not NEED the dealer's Stage 1 download for your bike to run richer. The Stage 1 download does have some adjustment to the timing which may or may not help with your pinging issue. The other additional thing it will give you is a 6200 RPM limit instead of the stock 5500 RPM limit.
If you have a few minutes to read, here is a post I wrote a couple of months ago which may help your understanding of open loop/closed loop:
The 2006 Dyna Series and all of the 2007 and 2008 Harleys are fuel injected and have oxygen sensors in the exhaust pipes to control and limit emission in compliance with EPA regulations. The maximum legal air fuel ratio is 14.7:1. This is very lean and as a result, these bikes tend to run hotter than earlier bikes.
For these 96" twin cam motors, the factory ECM operates in 2 modes - closed loop and open loop. In closed loop the O2 sensors tell the ECM how rich or lean the exhaust gases are and the ECM adjusts the fuel flow to each cylinder to maintain the A/F at 14.7:1. Closed loop only works in the range where the throttle is open from 0% to about 40%. This is where most of us ride normally. Above about 40% throttle, such as at high cruising speeds or fast acceleration, the ECM operates in open loop mode and the O2 sensors have no effect. The ECM then gets signals from other sensors in the engine and it does a decent job adjusting the A/F to a much richer range than 14.7:1.
On these bikes adding an air cleaner and mufflers that flow better than stock causes the bike to run leaner than 14.7:1, resulting in a hotter running engine. The ECM and the O2 Sensors can no longer adjust the closed loop A/F ratio back to 14.7. On my bike the A/F was 15.1 in closed loop mode after adding these two items. You need to do something else to correct the lean running. The Harley Stage 1 download adjusts the timing, raises the rev limiter from, I believe, 5500 RPM to 6200 RPM and somehow (but no one knows for certain how it does this) brings the Air/Fuel ratio back to the legal limit of 14.7:1.
If you want a little more performance than stock and are concerned about maintaining your warranty, I recommend the SE A/C, the SE street legal slip-on mufflers and the dealer installed Stage 1 download. From my personal experience, this setup definitely provides some performance benefit. However, it does not provide any cooling benefit over a stock bike.
Unless you are planning to go beyond a new exhaust and air cleaner with your bike, you really only need to concern yourself with richening the closed loop mode.
There are many ways to get your bike to run richer (ie: cooler) and there are as many different opinions as to how to best accomplish this as there are Harley riders. If you are not concerned about maintaining your warranty, you can skip the Stage 1 download and just go with one of the popular methods, some of which are mentioned below.
On the '07 & '08 bikes, the least expensive way to get the bike to run cooler (and easiest to install or remove) is to add the Nightrider O2 IED's or the XIED's. The O2 IED's will slightly richen the closed loop A/F to 14.2:1. The XIED's will richen the closed loop A/F to 13.8:1. These only affect the closed loop mode. Either of these will make your bike run cooler. You can use them with or without the Stage 1 download.
Disclaimer: I have no financial interest whatsoever in Nightrider. I am only a happy customer with a cooler running bike.
As I said above, many people have many opinions on how to make their bike run cooler and/or better. Your choices depend on how deep your pockets are. You can have your dealer install a SERT and set up your bike on a dyno, You can add a PC III, or a V&H Fuel Pak or other similar devices made by other companies. Some of these may require dyno tuning to set them up properly. Another choice might be a Twin Max or other similar device that is self programming.
Some of these are add-ons to the factory ECM and others replace the factory ECM. Some of these use the factory O2 sensors and others require you to disable, remove or replace the factory O2 sensors.
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