After spending half a day hunting lambda sensors (prices in this country vary from $300USD for genuine, down to $80USD for Chinese, and nothing used so far) I finally found a Chinese AFR sensor that works!!
I took the boat out yesterday for the first time in over a year with the intention of fault finding and ironing out issues. Unfortunately the babysitter called in sick at the last minute so I was a little limited in the testing I could do. After a few hours on the water swimming around and doing a few runs I found that the boat goes as well as it did previously.
The main areas to work on now are:
1) Working out how to stabilize the idle when the throttle is suddenly closed (when a skier falls)
2) Adjust AFR to target across the VE table
Idle Stabilization
In regard to idle stabilization there are probably a number of ways to do it with the VE table, idle and idle advanced settings. I'm curious on the VE table the roll of the far left vertical column and the lowest horizontal column when it comes to idle stabilization. In my case when the throttle is closed it dives to the bottom of the VE and then shoots across to the left column where it seems to be 'searching' for something?
The table I'm working for looks like this:
Screen Shot 2023-04-29 at 11.06.25 AM.png (377.35 KiB) Viewed 972 times
Apollard I notice that your VE table is leaner at low RPM and mid to high kpa.
Screen Shot 2023-04-29 at 11.09.38 AM.png (374.98 KiB) Viewed 972 times
Is this for starting or idle recovery purposes?
General Tuning
Going forward I'm looking for a solid tuning strategy. Starting and idle is pretty good and the boat accelerates and cruises pretty well. It's rich in some areas and lean in other areas.
Should I drive at a specific idle and adjust the VE to hit the target AFR or should I use the autotune feature on TS?
How should I think about the "tip in" where the VE table moves too quickly to capture the right AFR?
How should I address the idle stability after the throttle is closed quickly, is it VE, idle, advanced idle or a combination?
Once again thanks for all the input, this is a slow moving process but I feel I'm heading in the right direction.