- Sun Aug 07, 2022 12:51 am
#58036
Check if your WBO2 controller has delay or averaging that is compounding the issue. BTW, I always start with Simple, as it can be used to find correct or stable settings. This is true for me even if planning to move to a different control scheme, e.g., PID, as it ensures the new control will work better. Have fun!
justthetim wrote: ↑Sat Aug 06, 2022 9:34 pmI did several road trips with no issues. One day I was fully loaded with camping gear + thick gf , top down and I spent 3 hours at 4krpm and still averaged 24mpg oh and it was ~30C out.Awesome! So, here's some feedback of mostly concepts on some areas you played-with, for if it helps in continued tuning and troubleshooting. They may or may not apply to your issues directly.
My best has been 26mpg. Overall daily driving average around 23mpg.
justthetim wrote: ↑Sat Aug 06, 2022 9:34 pmEarly in the month I did have a much more aggressive tune with advanced timing, but I dialed it back because my NC broke and I had to make sure my NA would reliably get me to work.Timing only has one value at any specific load and rpm—correct. Aggressive or conservative (advanced or retarded) from the best value is counter-productive to efficiency and can be dangerous, making the correct timing the most reliable as well.
justthetim wrote: ↑Sat Aug 06, 2022 9:34 pmOne thing I want to point out is that my tunes VE Table is set to Multiply VE value by MAP Ratio : Baro. I believe the base tune is different. I found that this option made all my acceleration problems go away.I did not check all the current base tunes, but default for Speeduino is MAP:Baro ratio. This provides greater tune stability. Why yours is/was different I don't know. This is one reason shared tunes are usually not a good idea—you don't know what or why something has been changed. Frustration follows. I like that you're finding what works and sharing your findings. Keep the info updated as you make new or better findings.
justthetim wrote: ↑Sat Aug 06, 2022 9:34 pmI have IAT completely disabled. It's just not worth the headache. Heatsoak on the IAT pretty much guarantees that you'll be chasing your tail. Even if you got it right, there's very little gain in performance (as in mpg).Another sensor with data that stabilizes the tune, if placed and set with tuned corrections. It takes some work, but again adds accuracy and stability to the tune. Setting flat-line above a certain IAT can help it ignore heat-soak in non-boosted apps. As another off-the-wall example, I have always used IAT, but often moved it to a cold-air inlet area. The IAT sets global fueling change, and the tune corrections compensate for running changes. Not perfect, but much better than fighting heat-soak, and better than no IAT for stability. Either manipulation might be something to try.
justthetim wrote: ↑Sat Aug 06, 2022 9:34 pmI also keep DFCO ON at all times. This is worth +1 to 2mpg per tank. Also it keeps the engine temps down.Agreed, after the tune is finalized. Most everything I run gets DFCO, and it is just an added running interrupt to a good thing. Exceptions are typically racers that can't complicate smooth torque response on feathering or decel for handling.
justthetim wrote: ↑Sat Aug 06, 2022 9:34 pmAnd I keep EGO correction on with PID. I don't know how or why it works well on my car, but it does. If I use SIMPLE it sucks ass. It causes the closed loop feedback to go sinusoidal. PID works great.When Simple EGO cycles, it's typically the delay reading time is wrong, so it gets out-of-sync. It's reading values too early or late, compensating, but then it's too quick or behind for the next read and throws it further out. If it's set incorrect, it will be several cycles before it is back to a properly synced read, tries to correct a few cycles, over-corrects a few cycles, and there's your sinusoidal.
Check if your WBO2 controller has delay or averaging that is compounding the issue. BTW, I always start with Simple, as it can be used to find correct or stable settings. This is true for me even if planning to move to a different control scheme, e.g., PID, as it ensures the new control will work better. Have fun!
-= If it was easy, everyone would do it =-