![]() The concepts are similar, but I'm sure the detail on the programming has differences. So far I'm happy (once I figure out this decel poping, I can not find an exhaust leak anywhere) and have learned alot about EFI but still a novie (or 1st grade if you think about it in a school perspective).Ĭlick to expand.Agree. The one thing the TTS is better at, it has a broad range of base maps to choose from and the SEPST uses just HD SE parts, you choose the closest calibration and go from there. I'm thinking the SESPT w/ Smart Tune is similar in concept to the TTS w/ V-Tune. Most of the changes have been in cruise area where closed loop is, but that is where most of my riding is at. I'm hoping in about 3-4 more runs in different rpms/MAP areas, I have some good VE numbers (where the changes are small). My VE tables have been changing as I done some recorded runs and ran Smart Tune. My Closed Loop Bias table is set at 762, so in closed loop the CBLs will richen it up some. 14.6 is the switch to run in closed loop. ![]() I'm no expert but, my AFR table is set 14.6 for the majority of the cruise mode up to 3750 and up to 75 MAP. I checked and do not have an exhaust leak, so it's the open pipes and tune is the culprit prob (work continues) Got some decel poping when the throttle is closed using the engine as a brake around 2K (higher up in the RPM range when going faster), but I'll keep tweaking it. My first tank full with the first reflash was 41 MPG, so pretty good. It's a little hard to get all the cells filled up when your on the road, but I'm getting there. I'm going to keep recording, running Smart Tune and reflashing until I get some good VE #s where they do not change that much from the previous map. Still a novice but love the aspects of learning this stuff. I'm learning all about the different data points involved in our EFI bikes. I love the ability to review live recorded data of the runs. I've run Smart Tune on both front and rear VE tables, saved a new map and reflashed. I've made 3 recorded runs using the VCI (orange box plugged into the data port). Taking me a few days to figure it out, but I had the dealer install a base map for me. ![]() ![]() More to read, which I love as I'm 2 yrs new to EFI bikes and a novice for sure compared to other folks out there. After tuning with MyTune, the maximum difference is 4% and often the VE and expected VE are right on top of each other.Great link, Randall. Before tuning with MyTune, you can see his VE and expected VE are off up to 35%. You can then program this tune into your bike and give the ECM the best data to work with.īelow are two graphs of the VE and the expected VE from an independent user that used MyTune to tune his bike. MyTune will read the old and new VE values, apply custom designed algorithms to them, and create a tune specifically for your bike. The closer the VE values stored in the ECM are to the actual values that the engine needs, the more accurate and better your bike will run in all conditions. However, the ECM has a limited amount of range that it can correct. It is using this feedback to correct the volumetric efficiency (VE) of the bike in real time. The engine control module (ECM) in a closed loop EFI Harley Davidson is constantly getting feedback from the narrowband oxygen sensors installed on the bike.
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