SEPST experience so far, and a question or two
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Tourer
Joined: Jul 2009
Posts: 269
Likes: 1
From: Madison WI
SEPST experience so far, and a question or two
Ok, I've had and been playing with my SEPST for a couple/three weeks so far, I think I've got my VE tables in pretty good shape. over 100 miles of data runs (broken into several runs).
09 ultra - SE air cleaner (stage 1), and SE Fatshotz pipes.
I was anxious to start fiddling with some of the other tables...started by raising the CLB +60 across the board, didn't feel much different (butt dyno), but gas mileage went up.
This morning i took all the closed loop afr cells, and dropped them to 14.2 - a balance of power vs mileage. Bike felt like it ran much smoother.
I think I like this map so far, but need to check the mileage to make the final determination...I'd like to stay around 40 mpg for my everyday riding.
Question - why would one want to stay in a closed loop? Is this stricly epa requirments? (I've never hugged a tree in my life, so If i'm emitting more pollutants...i don't care..hehehe)
Are there any disavantages to running open loop?
Oh, in an open loop does the ecm just ignore any input from the O2 sensors?
Thanks!
09 ultra - SE air cleaner (stage 1), and SE Fatshotz pipes.
I was anxious to start fiddling with some of the other tables...started by raising the CLB +60 across the board, didn't feel much different (butt dyno), but gas mileage went up.
This morning i took all the closed loop afr cells, and dropped them to 14.2 - a balance of power vs mileage. Bike felt like it ran much smoother.
I think I like this map so far, but need to check the mileage to make the final determination...I'd like to stay around 40 mpg for my everyday riding.
Question - why would one want to stay in a closed loop? Is this stricly epa requirments? (I've never hugged a tree in my life, so If i'm emitting more pollutants...i don't care..hehehe)
Are there any disavantages to running open loop?
Oh, in an open loop does the ecm just ignore any input from the O2 sensors?
Thanks!
Thread Starter
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Tourer
Joined: Jul 2009
Posts: 269
Likes: 1
From: Madison WI
meant to add, I got the engine temp to run at 230 - cruising down a hgihway, it goes up into the 240's when running twisties hard...
That seem like a good head temp to you guys? or should I bring 'er down some more.
That seem like a good head temp to you guys? or should I bring 'er down some more.
Ultimate HDF Member
Joined: Nov 2008
Posts: 6,682
Likes: 12
Subscribing beacuse I want to learn more about tuning.
To the OP, for what it's worth to you, I've got the 09 you see in my sig with the setup you see below it and I just put the 255 cams in and had it tuned. My AFR's are as close to 14.1 all the way through the rpm band as possible if I understand what the guy who tuned my bike is telling me and I'm getting about 41.5 mpg so far.
To the OP, for what it's worth to you, I've got the 09 you see in my sig with the setup you see below it and I just put the 255 cams in and had it tuned. My AFR's are as close to 14.1 all the way through the rpm band as possible if I understand what the guy who tuned my bike is telling me and I'm getting about 41.5 mpg so far.
Road Warrior
Joined: Jul 2009
Posts: 1,579
Likes: 144
From: SC
Check the user's guide on the CD for the SEPST to better understand closed loop versus open loop. The closed loop only works at VE table settings of 14.6 (highlighted red). I have an 09 Road King with the 103 Pro Stg 2 103 kit with 255 cams, jackpot DT mufflers, and stock head pipe (non cat). I have my map still targeting 14.6 per the original AF table, and then tweaked the closed loop bias table to alter AFR under throttle. I get 44 mpg at 55 mph, and shifting conservatively. If I ride interstate to work at 75-80 mph, the mpg drops to 38.
Road Captain
Joined: May 2009
Posts: 642
Likes: 0
From: Haslet, Texas
I left my AFR table alone and ran smarttune for about 4 hours of riding. I then took the closed loop bias table and added 15% across the board. The wife and I rode 320 miles yesterday on the Blue Ridge Parkway and got 240.7 miles when I stopped for gas, Low light had not come on yet, it took 5.002 gallons to fill her up. 48.1 mpg. Thats two up in the mountains. Sounds good to me, I think I am done for now. I have a 2009 Street Glide with an Arlen Ness big sucker stage1, Rush slip ons 2" baffle, SEPST. Amsoil in all three. Absolutely wonderful ride. Perfect weather. Bike runs good no decel popping and stays reasonably cool for a newer Harley. SEPST software reports temps of 230 to 250 on data runs.
Road Warrior
Joined: Dec 2008
Posts: 1,639
Likes: 2
From: Australia
you want to keep the motor in open loop when cruising.
closed loop means the bike is looking at the oxygen sensors, adjusting mix to run nice and lean when cruising.
If you run open loop all the time the motor will run richer and waste fuel.
My bike runs 12:1 AFR when at full throttle, but backs right off to 14.6:1 when cruising and as a result gets 38 to 42mpg when cruising and low 30s when ridden hard.
There is a bit on AFR here:
http://www.daytona-sensors.com/tech_tuning.html
closed loop means the bike is looking at the oxygen sensors, adjusting mix to run nice and lean when cruising.
If you run open loop all the time the motor will run richer and waste fuel.
My bike runs 12:1 AFR when at full throttle, but backs right off to 14.6:1 when cruising and as a result gets 38 to 42mpg when cruising and low 30s when ridden hard.
There is a bit on AFR here:
http://www.daytona-sensors.com/tech_tuning.html
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