7300rpm on my kia forte thanks to sfr. and jay heres a quick video battery died more videos to come
KIA uses CVVT (continuous variable valve timing).bluej wrote: do you know if they can remap timing, fuel or vvt?
actually, does anyone know how the vvt on the 2.0 or 2.4 works? is it a map, switch, or hydraulic? combo?
thanks gripphard, that's exactly the info I was looking for. so if it's pwm, there's a map in the ecm that we should be able to altar. Imho, just altering the cam sensor wouldn't be very effective (be like altering base ignition timing vs. ignition advance) and could also effect other systems (ignition timing).KIA uses CVVT (continuous variable valve timing).
Continuous Variable Valve Timing (CVVT) system advances or retards the valve timing of the intake and exhaust valve in accordance with the ECM control signal which is calculated by the engine speed and load.
By controlling CVVT, the valve over-lap or under-lap occurs, which makes better fuel economy and reduces exhaust gases (NOx, HC) and improves engine performance through reduction of pumping loss, internal EGR effect, improvement of combustion stability, improvement of volumetric efficiency, and increase of expansion work.
This system consists of:
- the CVVT Oil Control Valve (OCV) which supplies the engine oil to the cam phaser or runs out the engine oil from the cam phaser in accordance with the ECM PWM (Pulse With Modulation) control signal,
- the CVVT Oil Temperature Sensor (OTS) which measures the engine oil temperature,
- and the Cam Phaser which varies the cam phase by using the hydraulic force of the engine oil.
The engine oil getting out of the CVVT oil control valve varies the cam phase in the direction (Intake Advance/Exhaust Retard) or opposite direction (Intake Retard/Exhaust Advance) of the engine rotation by rotating the rotor connected with the camshaft inside the cam phaser.
CVVT Operation Principle:
CVVT System Mode:
You maybe able to (find) install an adjustable exhaust cam sprocket, that will alter only the exhaust cam timing. Since, intake cam timing is controlled by the ECM, with feedback from a cam sensor on the intake cam. To change the intake cam timing, you need an ECM re-flash, or to reposition the intake cam sensor up or down somehow.
Hope this helps
- put together with aid of kiatechinfo.com
Reflash is totally worth it, especially if you can manage to get a programmer that has 3 different tunes on it. Have one for 87 with fuel economy tune, one with 93 street performance, and another one for 93+ track performance. Not to mention you can go back to stock tune when taking your car in for maintenance.So...had anyone actually done this yet? Are there any dyno charts/numbers? what exactly could I expect out of a 2.0 auto with CAI/muffler? Anything proving this is worth the $?