I think I'm heading in the right direction. I've posted some scatter plots below, showing data from full test drive sessions. It shows AFR reading for various manifold pressures. I think it bettter shows the result of multiple pulls rather than one example pull like I've been posting before.
Here's data from a test drive from several modificattions ago...
![Image](https://i.imgur.com/jcuaXkD.png)
Then the next test drive data set is from after the first needle profiling work. Note that the 'hole' in the top right of the scatter plot is growing - ie there are fewer data dots in the mid-range boost and high AFR section, suggesting some improvements when immediately on the throttle.
![Image](https://i.imgur.com/qralaAZ.png)
And then after some further needle profiling. I worked further down the pointy end. Note the hole is growing bigger. and the hole is growing twoards the high boost area - ie fewer high AFR data points in the high boost area.
![Image](https://i.imgur.com/xjO2Bsk.png)
So I'll do a bit more of that profiling including a little more towards the pointier end of the needle.
One thing to note though, these are prettey small sample sizes, about 5 or 6 WOT pulls. So I'm taking the data with a grain of salt, but it does look like its making progress. The low AFR section is growing though, as I richen up the needle, there are 11.5:1 data points in the mid and hi boost area now, but I guess that's the trade-off of modifying the needle?
Here's an example pull from teh last test run session so you can see the improvements in the trace...
![Image](https://i.imgur.com/edz5ilt.png)