Hi All,
After many attempts to change the AFR from 14.63. I have come to terms with myself, (Ha ha) that it cannot be done in closed loop. I have fiddled with the PE and that seems to meet my needs. It is a fine line to where i map WOT and general good throttle response. I have keep the values above 2,500rpm for WOT. I also made PE come in quicker when PE is enabled and at lower MAP. It still needs a little fine tuning. I am also working on the spark table.
Another interesting issue I noticed, is the high level of intake valve temp on cruise. On a really hot day I got up to 175 DegC. This made the engine very susceptible to knock. So I have drastically reduced spark at lower MAP range from 50 Deg to 38 Deg. This has made the INVT drop to 155 DegC, which has allowed me to increase spark on the acceleration. This was only done once I had properly calibrated my MAF and VE. The car is very smooth at cruise and seems to be better on throttle response. This was where I came up with trying to increase AFR to 14.00 so I could increase spark at lower MAP and keep temp in Chamber down.
please could some comment on this as to whether I am opening myself up to issues I am not aware of when reducing cruise spark
Regards
Mark