Single channel O2

Signman · 07-15-2011, 04:46 PM

"Frank, I run mine in speed density mode. Almost nobody else does. I set my maps to 3 Kpa and 500 RPM break points. It runs off a different row when the baro changes. It takes a while to run it in that many different conditions, but once you have it pretty much adjusts it's self. Everybody else I know uses Alpha N. It's for sure simpler."

Am now using Fast XFI 2.0 Set it up on chassis dyno to run Speed Density. Last weekend tried Load Based Speed Density but will more likely go back this weekend. Your comment about needing to let it see different conditions over time makes sense.
Many are using Alpha N for simplicity but if you go on the right chassis dyno (tuner) your high gear map will be good from the start. All the runs and data logging necessary to get close will cost you more than the day on the dyno!!!

The issue am having a lean spike when it leaves (footbraking) Then it goes rich and then lean again. Tough deciding how much acceleration enrichment is too much or not enough, and with the short time it takes to go from stage RPM to stall to shift point, exactly which cells in the map need to be leaner and richer. Considering the delay that has to exist from the actually event, when the O2 sees the ex gas plus the electronic delays. On the data log the event is well under 2 seconds. Even with my slow s**t.

07-15-2011, 04:46 PM	#18
Signman Senior Member Join Date: Oct 2003 Location: Lower Slower Delaware Posts: 535 Likes: 22 Liked 269 Times in 99 Posts	Re: Single channel O2 "Frank, I run mine in speed density mode. Almost nobody else does. I set my maps to 3 Kpa and 500 RPM break points. It runs off a different row when the baro changes. It takes a while to run it in that many different conditions, but once you have it pretty much adjusts it's self. Everybody else I know uses Alpha N. It's for sure simpler." Am now using Fast XFI 2.0 Set it up on chassis dyno to run Speed Density. Last weekend tried Load Based Speed Density but will more likely go back this weekend. Your comment about needing to let it see different conditions over time makes sense. Many are using Alpha N for simplicity but if you go on the right chassis dyno (tuner) your high gear map will be good from the start. All the runs and data logging necessary to get close will cost you more than the day on the dyno!!! The issue am having a lean spike when it leaves (footbraking) Then it goes rich and then lean again. Tough deciding how much acceleration enrichment is too much or not enough, and with the short time it takes to go from stage RPM to stall to shift point, exactly which cells in the map need to be leaner and richer. Considering the delay that has to exist from the actually event, when the O2 sees the ex gas plus the electronic delays. On the data log the event is well under 2 seconds. Even with my slow s**t. __________________ Frank Ferrucci I/SA 1271 "Be Thankful for the Gifts You are Given"