May I ask, for racing purposes or for normal cruising purposes?

waja 4G18 max torque should be at 3000rpm.

You should shift abit after 3600 rpm so then when it drops,the engine will still be at the max torque band area.

waja engine sucks.Nuff said.You want power go for MIVEC or like one guy did,transplant a Mitsubishi Galant MIVEC V6.Didnt even know its possible to do that.Saw it on sale in mudah for Rm30k

Even though you get max torque around 3000rpm, and the torque starts dropping after that rpm, the torque you get is still higher than any rpm you get on higher gears, little chance you get higher torque than lower gears unless you are using really close ratio gears, which is not your case.

You need to figure out your torque graph for each gear by figuring out the gear ratios & dyno testing, and determine at which rpm the next gear tend to give less dip in torque.

erm,I dont understand the rational of why you need to bother at what speed you change gear? Does your job requires you to constantly race against time that you need to shave off valueble seconds to reach ur destination?

Just let your muscle automatically coordinate.I believe if you drove a manual car lots of time,your timing to shift gear becomes automatic without needing to look at the RPM meter.Just be natural.

Your car definitely launches faster (and accelerate more) when high power (usually hi rpm->peak hp). Whether you have the force to pull your car (FF) forward is another thing, and whether your tire bites the floor is also another thing.

Actually i notice campro sweet spot is between 2.8 till 4k for my iafm that is