IAT Correction in Fuel
Posted: Thu Jun 18, 2020 9:46 pm
Hello,
I am working on tuning my supercharged 2007 S2000, and I did ~8 iterations of the tune in about 80 degree ambient weather. I tuned to 11.8:1 and through the iterations, never had to adjust more than 2%. It was making 14.1 PSI with IATs @~113 degrees by the last log.
The next morning, I went out and did a datalog @ 50 degrees. To my horror, the tune was WAY lean. 13-13.5:1 at the top, even with 9% higher FDC. It made 16.9 PSI and IAT was @~65 degrees.
I assume this means I need to adjust the IAT Fuel High Load table to offer a good bit more fuel at lower temperatures. Is this table in % fuel? Is this the correct place to be making adjustments for the cooler IAT and higher boost I see in cold temperatures?
Thank you.
I am working on tuning my supercharged 2007 S2000, and I did ~8 iterations of the tune in about 80 degree ambient weather. I tuned to 11.8:1 and through the iterations, never had to adjust more than 2%. It was making 14.1 PSI with IATs @~113 degrees by the last log.
The next morning, I went out and did a datalog @ 50 degrees. To my horror, the tune was WAY lean. 13-13.5:1 at the top, even with 9% higher FDC. It made 16.9 PSI and IAT was @~65 degrees.
I assume this means I need to adjust the IAT Fuel High Load table to offer a good bit more fuel at lower temperatures. Is this table in % fuel? Is this the correct place to be making adjustments for the cooler IAT and higher boost I see in cold temperatures?
Thank you.