Well I certainly did not have a particularly good day at Sydney Motorsport Park South circuit yesterday. All my own fault of course. I should have spent a day at my local circuit tuning the fuel map to suit the massive drop in inlet air temperatures I have now with the air/water intercooler.
I ran out of time and instead spent some time driving around the pit area and letting the auto tune function adjust the map at slow speed. The plan was to use the practice session to tune the map at all rpms. I lined up at the back of the grid and when I drove on to the circuit the car ran rough at first till extra fuel was added and it gradually smoothed out. The plan was to increase speed and rpms each lap till the car sorted itself out. This circuit is hilly and a few corners straight into a climb. The engine stopped when it hit a lean spot and I could not restart, the battery was too low. I had to get towed. To make matters worst I got towed all the way through the pits! 73 starter at the event, about 12 in my group.
The new extra water pump probably draws about 5 amps and this is just too much for the alternator with the large pulley it has at the moment. Way back I blew up an alternator because it was reaching 26,000rpm for short periods and I slowed that down with a large pulley. Page 13 message 241. Now I only have 11.5 volts at idle [1500]. That's not good enough and I have a 70mm pulley in the mail.
The bad news is when the engine stopped I lost all the changes to the fuel map. I do have a data log though and with the video I should be able to get into the ball park. In the next couple of weeks I will spend a day at my local circuit just driving around at all speeds and sorting the lot out like I should have done!
The good news is the new air inlet temperatures. It was a hot autumn day at 31 degrees C. The data log showed the new IAT as 33C and it never varied. On this circuit previously it varied between 80C to 100C. Quite a bit of fuel was added so I'm expecting some extra power at the top end.
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