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Message: <blockquote data-quote="^pomen_GTR^" data-source="post: 1063319166" data-attributes="member: 92301">simple..answer for 1: its all because of the velocity...and flow efficiency...imagine u were on a road with several traffic light that have same distant....and the light turns into green as u cruise by slowly with minimal traffic....that was on low rpm...but when try to drive past all the light in high speed on sam traffic u can past some light..but not all because u have to stop/slow down to wait the slow-next green light...short time frame for green light also making u slower when high traffic...the capacity of traffic was even small because all of them would be slower and slower since too many trafficthis means the engine starving on high rpm..compared to low rpm relaxed condition...and u cant go fastanswer for 2: same traffic light on that stretch...but one day u were cruising like normal,suddenly one of the light on red longer......even the green was longer by the time u start to move the next light have already turns red..have to wait long again before move on slow speed cruising....but if u drive fast enuf u can go through past all the light easily.....so when even high traffic capacity travelling at high speed all of you can co through the light sap sap sui....but imagine got hoggers and all have to drive slow in heavy traffic..sure cannot go through all the light..still stuck at some...this mean the engine was good at high rpm...compared to low rpm "hogger"....u have to go fast but if u go slow then it wasn't smooth...takes time to accelerate after slowing down...answer for 3: why FC affected so much???stock camshaft lift and duration have been calculated by the engineer to balance power,torque and acceptable fuel consumption in mind....when u change to higher lift+longer duration..but this means higher fuel sucked.....coz higher lift+Longer duration sucked more fuel+air during intake stroke....but longer duration waste the sucked fuel+air during compression stroke because the mixture already escaped through the late closing exhaust valve....there u goes wasting money on fuel....on idle......still,since the powerband move to higher rpm...u have to rev higher to get the car moving from stop...rev higher means higher FC...more,since it was higher lift+longer duration to get more power by allowing more fuel+air during intake at higher rpm..and u have drive it on high rpm to maintain the powerband...it simply means higher FC in any way u drive a modified camshaft car...be in mind....a camshaft only have theorytical optimum range around 2000rpm range....like 3k-5k range...2.5k-4.5k 8k-10k rpm range....so if u get "this much" in specific rev range...u cant get the same on other rev range....this is why v-tec,mivec,vvt,vvti,dvvt etc etc invented.....to give a broader optimum range of a camshaft.....to the engine</blockquote>

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