i find this very cool! thanksI'm visiting from the SVX forums and I thought I would share a little discovery we made in the hope it will be useful to you guys.
I've never seen an USDM Impreza, so I'm making an assumption that some of you have the 4EAT automatic gearbox and that it is similar to the one fitted to USDM model SVXes.
The USDM 4EAT has a power mode that comes on when you kick down on the gas. The power mode causes the gears to shift at a higher RPM for increased acceleration when overtaking.
The JDM 4EAT in my cars also has a power mode, but it is activated by a switch. I traced the wiring and found that the switch connects pin A4 of the TCU to ground. That's the 4th pin of the 1st connector.
After I posted that on the SVX forums, a guy called Nomake Wan compared the wiring on his USDM car and found pin A4 was not connected. So he grounded it to see what would happen. When he put shifter in D, the power mode came on, just like the Japanese cars.
Since then, a lot of USDM SVX owners have started connecting up switches to enable power mode and the feedback has been overwhelmingly positive. It makes the car feel much more responsive and sporty to drive.
A few guys on the Legacy forums also tried it, but with mixed results. It works for some but not for others. It depends on the firmware version of the TCU.
Maybe it will work for you, maybe not. But it is probably worth trying.
ive have had mine done since my post on 9/17 and have not seen a decrease only thing thats going to hurt gas milage is how heavy your foot isso this mod keeps it in this "sport" mode consistently? sounds like its not the best idea ever for gas-mileage concscious people, but if its as simple as grounding the pin then installing a toggle shouldnt be that difficult, either. anyone have input on that theory?
<not the best with electronics :lol: