adjustable fuel pressure regulator...

previously i had overheating problems if maintain at speed 140kmh above... after several discussion with local mechanics, they suspect my ignition timing is a bit too high... i lowered the timing till 10 degrees advance (previously was 25 degree advance)... overheating still occurs... after several consideration, overheating was not mainly due to ignition timing as i suffer no detonation or pinging even at 25 degree advance... AFR was quite stoich refering from my previous dyno run... so, i guess its my tiny radiator problem... a few lines possibly stuck inside due to accumulated rust...

since i had previously bought my fuel pressure regulator, why not try bump up the fuel pressure a bit... richen the AF ratio a little... this allows a bit better cooling as fuel has cooling effect...



currently boosting 2.5 bar...



overheating solved... maintain 150kmh also no overheating... AF is a bit rich... hence, low end torque lost a little...

reinstall thermostat...

previously when i did my engine, my mechanic afraid the engine will face overheating issue... hence, he removed the thermostat for better water flow... this is in fact the wrong method of solving overheating issue... thermostat is there for a reason... it allows the engine to work at proper operating temperature... cold is not always the best...

anyway, i went and bought a normal thermostat rated 82oC... means at 82oC, the valve will open, allows water to flow through it and circulate to the radiator for cooling...



process of installing back the thermostat should be very easy... the thermostat housing is held by just 2 bolts... but in the end i need to remove the fuel rail, throttle body, front strut bar and throttle body coolant lines...



when i install back everything, i noticed my ISC socket is kinda loose... no wonder i had cold start difficulties... now my car warms up faster...