Megasquirt tuning, part 1

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I set the timing yesterday, and today earthed the LC-1 wideband 02 sensor to the same spot as the Megasquirt - it's in the engine bay, beneath the washer bottle. I then reprogrammed the LC-1 output to wideband (by default, it emulates a narrowband), and I've now got what looks like a reliable AFR reading.

The car was starting and idling well, so it was time for more gentle tuning... except the fuel tank was almost completely empty! What a muppet! There was little option but to drive it to the petrol station, about a mile away... and it was FINE. I then got Mrs B to drive it a little while I meddled with the fuelling, using the Required Fuel calculator mostly. It ran weak when set for a target AFR of 14.7, but using 12.7 (as recommended by DIYautotune) fixed that. Idle drops to 500rpm after a run though, it soon returns to 800 but I don't know why it does this yet. I took it for a longer gentle run this evening and collected some data, don't now what to make of that yet either. Lovely pretty graph though.

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