QUOTE(omara86 @ May 7 2012, 10:56 AM)
davidke20.. sry if i'm asking this, i'm malas to search in this thread, can teach me how to read vacuum reading to determine the best fc? thinking of installing it too.. thx...
There are many ways to read vacuum, so I just list some common stuff here. Since I'm US norm, I read INCH. You will have to find out conversion of PSI or CM by yourself. Our vehicle vacuum reading is base on MERCURY, if meter show 10in/Hg meaning every second the intake manifold is sucking in 10inches of mercury(worth of air) into the burning room. Correct me if I'm wrong.
Vehicle idling should read 15 and below(take note vacuum reading is NEGATIVE value,below means 15 and above).My BLM hot idling is 18, cold idling is 15. Aircon compressor weighted 5. If cold idling pasang aircond, vacuum will raise from 15 to 10! Meaning during cold idling 1/3 of the petrol used to supply aircon alone! My Plotong Vila idling 20, with aircon 18(very healthy). My brother's BiBA idling 19, with aircon 17(very healthy). My ISWAGA idling 21, with aircond 19(f*cking efficient). Normal healthy idling reading should be stable(do not switch on aircon), your reading should not deviate too much. If gradually raise & drop, you may have a loosen throttlebody. If the reading rattle unrythmically, you installed hicam ady
Efficient driving, by tapping on the accelerator, throttle body is instructed to open. When throttle body open, vacuum will lose because surrounding air will push in. Therfore an engine uses throttlebody to LIMIT air induction(not as we thought uses it to increase air intake). Our S4P throttlebody is already oversized, therefore cincai step on gas pedal, vacum will raised to 0!!! Every corner we took, every traffic light pickup we did actually cost 2x/3x than other cars! I use vacuum reading to practice my right foot, gradually step into 5in/Hg, when the car start moving then grdually let loose my right foot to achive 10in/Hg. As shift up to top gear, we can easily assume driving range between 10-20in/Hg by controlling the gas pedal. You'll be surprise most of the time if u try to maintain 10in/Hg driving, your travelling speed matches SPEEDLIMIT! For example, at winding road near Kuala Kubu Bharu, 4th gear 10in/Hg and below can only result in 80kmh, max 90. However, at straight highway 5th gear 10in/Hg and below can only result in 110kmh max 120kmh. Anything above that is using more petrol than traveled distance(not efficient).
Downhill vacuum reading become tremendously inaccurate. Piston pulled down by crankshaft create suction, throttlebody is closed, actual vacuumization will put down to horrandous 26in/Hg(burning lean). At this time, engine burning room actually suffering high heat without our knowledge, because water temperature is taken from radiator, whilst you think your radiator reading is dropping, your engine is burning with less fuel at high speed! People always claim they never boil their radiator,how come they fired their gasket? I believe this is 1 of the cause.
Vaccum 10 & above(less than 10) meaning is burning rich, 10 & below is consider efficient, 20 & below is lean. That's all for now. My finger almost patah ady.
May 7 2012, 11:51 AM

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