One of KD-FTV weakness is from it's TBW (Throttle By Wire) system.
You could install Ground Cable with following points :
1. Throttle Body
2. Cyl. Head
3. ECU (behind the dashboard)
4. Injection Pump (there are sensors & actuators around Inj. pump)
5. Injector Driver module (mounted on firewall, engine bay side)
6. A/T unit (if your car equipped with A/T)
My experiment with 2 KD-FTV (Innova D4 D) resulting more accurate throttle response according to "right pedal movement".
I only make small improvements on my engine, like AAI (Auxiliary air Induction with 3 PCVs & 3 mini filters), free flow Simota Air filter, Rounding Down Pipe with 3 inch pipe near Turbo, semi free flow muffler, dialed TPS, Rizor Max. 2B Turbo Lag eliminator & Rizor RFP Injection Pump assist (RFP is a mini fuel reservoir installed after fuel filter, it receives fuel from filter also fuel return from fuel rail + injection pump and send them back to the Injection Pump) and lengthening wastegate hose by 5 cm.
I use Max. 2B because 2 KD-FTV is using conventional non VGT Turbo.
Dialed TPS (Throttle Positioning sensor) is enlarging bolt holes on the TPS unit, so the TPS could be dialed like Ignition distributor in gas. engine, resulting better response on low to mid RPM.
Result is satisfying for daily driving, also improves mileage. :D