We had the opportunity today to tune another V6 STi with a Vi-pec already installed in it.

The original tune in it had AFR of 9s! We revised the tune with the correct AFR the engine wanted and wala, the vehicle made extra 20hp, using 20 percent less fuel.

Although overall Torque only made 6Nm more, we tuned the engine so that the Torque was smoother throughout the WOT and also on overall driveability. By doing this, the effective Torque will be holding longer and more consistently, thereby increasing overall response as well. If you look at the graphs at 6000rpm, the inital torque was at 345Nm and after the tune, the torque was 365Nm.

We also fine tuned all the AFR and Ignition load sites to make sure driving response was better.

First Graph:


Final Run:


Regards,
Mao