Added 25% more fuel everywhere above 1250 rpm. Brought the AFR to within a point? ie; 13.2 when the AFR table wants 12.2. Next question is how close does it have to be for LTT to take effect? All FM says is "in the ballpark", a fine statement, but essentially useless to a noob. I can't find it in the ECU manual either.

You only want the long term trim to be +/- 1-2%. The better your fuel table, the lower the long term trims. So if you’re targeting 11.8 at 7psi, you should be 11.6-12.0

fyi, you can devide your actual afr by target for a percentage. So using the above 11.8 example, if you’re at 12.8, 12.8/11.8=1.085, multiply the fuel table by 108.5%.

Thanks curly, working on it. Should I zero the long term trims every time I change the fuel table? If I have it correct the datalogged AFR's will include the LTT trims assumimg the LTT is active, introducing an error in the correction factor, albeit a small one.

Just to update. In the stupidity awards, I should get an honourable mention. I decided to pull the plugs to check on them 1-3 looked normal, 4 looked like it had never seen combustion. It hadn't. It was sparking, but no fuel. There is no continuity in the wire from Hydra to the injector. There is one splice in there, made by me, with the harness on the bench. In other words, ideal conditions. Now I get to take the fuel rail out to repair it. A smart man would have bench tested it. Once I have a four cylinder engine again, I will zero the long term trims, put back in FM''s base map and start over. Still surprised at how well it idled, considering. No longer surprised how sucky it was under load.

Wiring fault was not my splice. Problem was at ECU. The wires are quite fine and the connector had been crimped with too much enthusiasm, breaking the wire. Fortunately I had ordered spare connectors and the tool, as earlier on in the build as FM had not included a wire for the VICS. I know....., I should have ditched the VICS.