Hondata - Return to Idle (9th December 2010)

Problem is really solved now. Here what I did

1. Tune the idle air-con on and air-con off to the same afr using O2 (sensor overlay worked best) . Used a richer mixture (race cams, exhaust reversion) - O2 swing/STRIM didn't look so good at richer mixtures, but engine likes it. This made a big difference
2. Checked the ECU was bumping up INJ and IGN, the instant ACSW=0
3. Fined Tuned the IGN in the idle air-con off and idle air-con, and the trace area between to the two areas, such that the IGN always goes up (e.g. from 30 deg air-con off to 33 degrees air-con. This made a big difference
4. Dumped fuel in 12kPa load area 1800 rpm to 3,000 rpm
5. Set over-run TPS (MAP) to 8KpA 500rpm to 4000rpm - i.e minimum setting as possible
6. Quicken STRIM rate of change

Not as easy as "no name" after market ECU, but learned alot!

My return to idle on throttle lift off at 4,000 rpm, clutch in is now ALWAYS a glide path back to target idle - 1,300 rpm