Whilst waiting for my second replacement diaphragm, I'd bought some new brake pads.
I've tried OEM: so-so, EBC Greenstuff: Not a lot different to OEM, and EBC Redstuff on the 911: Better than OEM, so I thought I would try out Yellowstuff.
Who knows how these will behave but I will keep you posted.
As for the fuel pump saga, so I went around the buoy again.
Rebuild fuel pump - tick.
Reconfigure fuel lines to fit a pressure gauge - tick.
Refit P78 tool to double check float level with new fuel pump. - tick
Change the idle jets from size 57.5 to size 55 to try to increase AFR at light idle loads. - tick
Change the main jets from 122.5 to 130 to try to reduce AFR at WOT. - tick
Now check the fuel pressure - approx 3.2psi - spot on.
Check the float levels are still good - tick.
Check AFR at idle with new jets AFR a little over 15:1 suggesting the reduced idle jets have altered idle mixture - richen up idle screws to get closer to 14:7.1
So how does it run -well a couple of carb spits after first start but all gone after 60 seconds or so. I suspect these are a lean condition whilst the carburettor fuels properly.
Time for a drive and hope the fuel pump holds out!
When cold there is still the lightest of hesitation getting from say 1.5K to 2.5K, but once warmed up seems better.
At WOT the AFR seems to hold around a much better 12.5:1 ( max power ).
Idle sits somewhere around 14.5:1 on average.
Light throttle still seems a bit rich with readings often in the 11:1 to 12:1 range but possibly a little better than before.
Here is the new AFR distribution over my standard test roads.
Whereas previously I seemed to have two peaks either side of 14.7:1, the bulk of the spread seems to be between 12:1 and 15:1.
In my mind I should have moved the previously lean WOT peak to the other side of 14.7:1, and have pulled the idling circuit peak down a smidge.
I may take the car out again and get some more data but it seems to drive pretty well, so will keep with this setup for a while.
It would be interesting to see what the car did if I was to reduce the idle jets from 55 to say 52, maybe I should gamble another £40 on an extra set of jets.