Nissan Car Lounge - Almera, Juke, Latio, Qashqai, Sylphy, Teana Owners > Latio
My FC Getting Better With Low RPM
Jazz:
--- Quote from: limck007 on December 15, 2008, 10:52:30 AM ---To my understanding, as long as u depress ur accelerator, the fuel will be injected. BUT if u dont press it, no fuel will be injected loh..
thats y, when i go downslope, i dont depress the accelerator... let gravity do the work for me + i save fuel aka $$$
--- End quote ---
Ha ha ha ...... wrong !! Don't tell me when your engine on idle, no fuel is being injected ? So your engine block is vacuum if you do not step on your accelerator and let it free run, put your gear to D mode and just let it roll. :bleh:
SoL:
When idle, yes, fuel is consumed.
However, when in gear, like D, something called deceleration fuel-cutoff (DFCO) takes place. From what I observed on my 4AT, at speeds above 45, when you lift your leg off accelerator, the fuel injection cuts-off. Instead, the engine is kept running by momentum from the wheels.
Fuel injection continues when your speed is below 45 in D, when the engine rpm isn't enough to keep the engine running. So normally when stopping, i'd go from D to OD-OFF to 2, then stop. Helps save some fuel.
This is not a very good way to go downslope unless you're planning to stop or you're going too fast, as engine braking is still not as good as coasting in Neutral.
This feature has been in cars since 92, if i'm not wrong.
Toalson:
Fuel is being consumed even if you dont step on the acceletor. As long as engine running fuel is consumed but at what rate will depend on rpm.
Didnt one of the fuel saving techniques discourages idling? :bleh:
ralliart99:
--- Quote from: fri13th on December 13, 2008, 08:37:11 PM ---Yes bro but these 2 points are only part of my secret of good FC......pressing hard to reach cruising speed at expressway have to depend on road condition like if its up hill slope i would advise to stay at 2krpm and if its flat or even better if down slope i will press harder to take advantage of gravity to pick up my speed :thumbsup:
For cruising on highway i do not stay at 90km/hr constanly as i adapt my speed according to gravity.....example if i know that i am approaching a uphil slope i will step on the throttle slightly harder to reach maybe 100km/hr to build up my car kinetic energy to go up the hill but i will still stay at highest gear and not press that much to let gear shift to lower range as that would mean that our engine is wasting fuel to fight with gravity and when i reach the top of the slope i will than let the car glide down it to reach speeds up to 110km/hr and very slowly gently ease the throttle to let it reach back to 80-90km/hr :thumbsup:
For normal road actually quite simple to get good FC if we all follow the logic of 'The less u brake the better ur Fc' & 'The moment u release the throttle no fuel is consume untill ur speed fall untill about 30km/hr' soo we try if we can to look further to anticipate traffic and lights and let the engine do the braking and not the brakes to save on the fuel and brake pads :yehyeh:
--- End quote ---
yo guys, did something similiar to the bro's method above,
A) i reach my optimum speed asap and maintain that as long as i could. i keep a distance with the car in front so i do not need to depress the brake in case the car slows down. i just need to release the accelerator.
B) as for main roads, i pickup at rpm to 2 max and maintain speed. try not to have sudden surge of speed
i reach my half way mark and clocked a total distance of 310
i was surprised too at the reading, even double check to see if the reading is correct :bleh:
btw, i'm on 16" 205/50. my previous readings before this experiment is around 13 to 14km/l best. hope can better this :)
on 60 expressway and 40 main roads :smile:
SoL:
--- Quote from: Toalson on December 17, 2008, 12:08:17 AM ---Fuel is being consumed even if you dont step on the acceletor. As long as engine running fuel is consumed but at what rate will depend on rpm.
Didnt one of the fuel saving techniques discourages idling? :bleh:
--- End quote ---
Yes, idling is discouraged because idling occurs when you stop, which means engine rpm is not enough to keep engine running without using fuel.
At high speeds like 45 and above(for me), when u lift your leg off accelerator, fuel injection stop, thus engine braking. If you don't believe, try this:
1.Get your speed up to 70-80km/h.
2.Release accelerator. Your car speed should slow down very fast. This is engine braking, and no fuel is being consumed at this point.
3.At around 45km/h, you should feel a jerk as fuel injection resumes and your car is free wheeling(less engine braking).
This is tried and tested on 4AT. For CVT, your mileage may vary.
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