Yesterday the C2 went back on the dyno to further fine-tune the mapping. The car performed very well on the @nuerburgring last weekend, but I noticed that the car was running a bit rich. This was confirmed when we measured the emissions.
Props to unlimited tuning in Amersfoort for fine-tuning the afr even further. But unfortunately this didn't solve the problem of the high emissions. In spite of a perfect afr programming of 0.88, the car reverted back to a afr of 0.7...(Which is a MOT fail)...
But while dynoing, Jeffrey from Unlimited Tuning and Edgar from EH Autoservice pinpointed the culprit. Because I run a aftermarket MSD ignition coilpack, which sparks al four cilinders at once and doesn't send timing info to the ECU, the engine switched from the OEM sequential injection to phased injection 20 seconds after start up. This didn't affect performance, but resulted higher emissions because of unburnt fuel getting into the exhaust due to the phased injection sequence. This isn't really solvable with the OEM ECU.
So now Edgar from EH Autoservice has spliced in a super seal connector so we can run the OEM ignition coil on the road and switch to the MSD unit in just a matter of minutes for track use! 🤘🏻 (De MSD ignition is far more reliable than the OEM one under heavy use and at high temperatures)