Alrighty everyone, today it is 75 degrees and low humidity. I spent about 2.5 hours tuning with the afc2 and the plxm300. I definately found out something interesting....
Our ECU is smart. The stock ecu WILL curve it's on fuel under closed loop. Now, I am sure many of you know that already, but I wish I did before I spent 1 hour tuning the low throttle to 12.5 all the way to 4K!! Sure enough, I turned the car off to get gas....turned it back on, and WHAMMY...back at 14.0-14.5 the whole drive home. I am thinking...HMM...that is weird (I checked and all of my fuel % values that I plugged in were still there)...so I test it.... I begin to change the % at idle and get it to about 12.3 and I let it sit...sure enough....after about 10 minutes into it, it had worked its way back to its 14.0-14.5 ratio on it's own. The ECU changed it back to it's on curve. SOOO...at that point, I just set all RPM A/F % to zero across the whole LOW throttle board from 1000-7600. I focused on the HIGH throttle at that point. I do believe that somewhere around 75% throttle is when the ECU goes to open loop, therefore, providing me with my window to actually tune MY values in. I did notice that under 100% throttle between 2800 and 4000 it liked to spike a little lean, so I added fuel. About 5% at 2800 and 3% at 3400. Below are the other values:
4K: -11%
4600: -12%
5200: -14%
5800: -16%
6400: -20%
7000: -20%
7600: -20%
With these values, I have consistant AF's of about 11.8-12.7 Pull after pull on the street. I have yet to get to the dyno. I am going to try and refine these even a little more, but I definately feel a nice power gain, especially between 5k and 7k. These numbers are with the mods listed below on the stock twins at 13-14psi. DAMN, i wish i wasn't so stupid about trying to tune the low throttle...oh well...this is my first real tuning experience on the afc2 and on the 1jz period.
Trev
Our ECU is smart. The stock ecu WILL curve it's on fuel under closed loop. Now, I am sure many of you know that already, but I wish I did before I spent 1 hour tuning the low throttle to 12.5 all the way to 4K!! Sure enough, I turned the car off to get gas....turned it back on, and WHAMMY...back at 14.0-14.5 the whole drive home. I am thinking...HMM...that is weird (I checked and all of my fuel % values that I plugged in were still there)...so I test it.... I begin to change the % at idle and get it to about 12.3 and I let it sit...sure enough....after about 10 minutes into it, it had worked its way back to its 14.0-14.5 ratio on it's own. The ECU changed it back to it's on curve. SOOO...at that point, I just set all RPM A/F % to zero across the whole LOW throttle board from 1000-7600. I focused on the HIGH throttle at that point. I do believe that somewhere around 75% throttle is when the ECU goes to open loop, therefore, providing me with my window to actually tune MY values in. I did notice that under 100% throttle between 2800 and 4000 it liked to spike a little lean, so I added fuel. About 5% at 2800 and 3% at 3400. Below are the other values:
4K: -11%
4600: -12%
5200: -14%
5800: -16%
6400: -20%
7000: -20%
7600: -20%
With these values, I have consistant AF's of about 11.8-12.7 Pull after pull on the street. I have yet to get to the dyno. I am going to try and refine these even a little more, but I definately feel a nice power gain, especially between 5k and 7k. These numbers are with the mods listed below on the stock twins at 13-14psi. DAMN, i wish i wasn't so stupid about trying to tune the low throttle...oh well...this is my first real tuning experience on the afc2 and on the 1jz period.
Trev
