if so.... no .... dosnt affect it at all, PWR will let your car kick back a gear easier to climb, ect will struggle till you stomp your foot then react the same i guess.
going downhill... i would turn your O/D off i guess? use a little bit of engine braking
Joined: 12 May 2008 Posts: 2211 Location: Southside, Adelaide
Posted: Tue Jul 14, 2009 10:39 pm Post subject:
I used to leave mine in power all the time, but I figure it would use less petrol on normal mode (seeing as I drive to speed limits most of the time anyway like a commoner)? I think this has been discussed before and there wasn't a whole lot of difference, but it spends more time at lower revs so I guess it could?
Joined: 26 Jun 2008 Posts: 1485 Location: SE Melbourne
Posted: Wed Jul 15, 2009 7:48 am Post subject:
It does not affect WOT at all, that is a separate setting.
I used it for towing once, used a lot more fuel and i didnt really notice much better pulling power, not worth the extra fuel IMO. Now i just drive it in normal all the time.
Joined: 17 Feb 2009 Posts: 153 Location: adelaide sa
Posted: Wed Jul 15, 2009 12:24 pm Post subject:
Warfare wrote:
I used to leave mine in power all the time, but I figure it would use less petrol on normal mode (seeing as I drive to speed limits most of the time anyway like a commoner)? I think this has been discussed before and there wasn't a whole lot of difference, but it spends more time at lower revs so I guess it could?
leaving it in "economy" will actually make it use more fuel... changes gears earlier, but requires more throttle, thus more fuel to accelerate at same rate or maintain speed... if you have a boost gauge, test it out.... or better still, to really test it, shift manually and watch your boost... you'll run much lower boost whilst driving "normally" and yet your car will accelerate the same, if not quicker with identical throttle settings than what it does in econo mode... (PWR off)...
PWR off, the engine is loading up more at lower revs, thus using more boost, more fuel... _________________
Withus, goest thou australia, in your bumpy cars, in the middle of the night...
Joined: 22 Mar 2009 Posts: 260 Location: Newcastle
Posted: Wed Jul 15, 2009 10:49 pm Post subject:
stafka wrote:
Warfare wrote:
I used to leave mine in power all the time, but I figure it would use less petrol on normal mode (seeing as I drive to speed limits most of the time anyway like a commoner)? I think this has been discussed before and there wasn't a whole lot of difference, but it spends more time at lower revs so I guess it could?
leaving it in "economy" will actually make it use more fuel... changes gears earlier, but requires more throttle, thus more fuel to accelerate at same rate or maintain speed... if you have a boost gauge, test it out.... or better still, to really test it, shift manually and watch your boost... you'll run much lower boost whilst driving "normally" and yet your car will accelerate the same, if not quicker with identical throttle settings than what it does in econo mode... (PWR off)...
PWR off, the engine is loading up more at lower revs, thus using more boost, more fuel...
Sorry but thats bullshit
Power mode will see it drop to a lower gear at the slightest aceleration and hence higher revs and more boost = higher fuel consumption
for instance i can be cruising up a small incline in economy mode at the speed limit sitting in 4th gear, flip it to power and it drops back to third and uses more revs and more fuel
also when in power mode it will rev higher before changing gears if you just drive normally with a low throtle %
Joined: 17 Feb 2009 Posts: 153 Location: adelaide sa
Posted: Thu Jul 16, 2009 8:57 am Post subject:
LewyTheFlyJZS147 wrote:
stafka wrote:
Warfare wrote:
I used to leave mine in power all the time, but I figure it would use less petrol on normal mode (seeing as I drive to speed limits most of the time anyway like a commoner)? I think this has been discussed before and there wasn't a whole lot of difference, but it spends more time at lower revs so I guess it could?
leaving it in "economy" will actually make it use more fuel... changes gears earlier, but requires more throttle, thus more fuel to accelerate at same rate or maintain speed... if you have a boost gauge, test it out.... or better still, to really test it, shift manually and watch your boost... you'll run much lower boost whilst driving "normally" and yet your car will accelerate the same, if not quicker with identical throttle settings than what it does in econo mode... (PWR off)...
PWR off, the engine is loading up more at lower revs, thus using more boost, more fuel...
Sorry but thats bullshit
Power mode will see it drop to a lower gear at the slightest aceleration and hence higher revs and more boost = higher fuel consumption
for instance i can be cruising up a small incline in economy mode at the speed limit sitting in 4th gear, flip it to power and it drops back to third and uses more revs and more fuel
also when in power mode it will rev higher before changing gears if you just drive normally with a low throtle %
this all chews up more fuel
it's pretty much dependant on throttle setting and load... not revs... try it next time your driving, particularly on a hill. drive up the same hill in 4th gear. measure throttle setting, and check how much boost your using. then click O/D off, continue up hill in 3rd and maintain the same speed. you will be running lower boost, and using a lighter/lesser throttle setting to do it... the only difference with boost, is that it comes on boost QUICKER at high revs when throttle is moved.
Think about it.
if you have your foot down, and boost pressure is up at low revs...
The throttle is open, thus allowing more fuel through the engine.
Boost is up, thus forcing more fuel through the engine.
The engine is straining and loading up at lower revs, thus working harder to make power lower in the rev range...
all equals more fuel consumption...
if you run a boost gauge on your car, watch it next time you are driving NORMALLY. as the revs come up, the boost drops off. why? the engine is under less load, as it's making more power. thus requires less throttle, which means less boost being produced. = less fuel going into the engine, but the engine is still revving higher....
if you have the engine running at higher revs, its making more power with less effort. UNLESS, and it's a big UNLESS, you have your foot flat to the floor...
at the end of the day, an engine under moderate load, eg going up a hill, uses less fuel when run at lower throttle settings at higher revs, than it will when run at higher throttle setting, with lower revs. has to work harder to do the same job, is under higher load, requiring more fuel, thus uses more fuel.
why do you think a manual version of ANY car uses less fuel than an auto version. all fuel economy tests for any car done by the manufacturer, and fuel economy figures published by a manufacturer, are ALL using manual cars. Why? because manual cars drain LESS power from an engine than an AUTO box. A manual boxed engine doesnt have to work as hard at lower loading and throttle settings than autos, and generally a manually driven car will, on the whole, rev HIGHER MORE CONSISTENTLY than the same auto car...
higher revs dont = higher fuel consumption.
Load at low revs = higher fuel consumption...
If you labour an engine, it uses more fuel. if you dont labour an engine, and use revs to provide power, not throttle, it uses less fuel. IE: an auto box shifting at low revs, but trying to accelerate at the same pace as an auto box shifting at higher revs, will use more fuel.
i do digress, however, that the only time higher revs = higher fuel consumption is at prolonged high rev situations. eg sitting on 110kph on the freeway for hours, in 3rd gear with an engine running little to no load, at 4000rpm, will use more fuel than the same engine, sitting on 110kph under little to no load, in 4th gear at 2200rpm.
one of the few times running at lower revs = lower fuel consumption...
anyone else care to offer any other explanations on this one? _________________
Withus, goest thou australia, in your bumpy cars, in the middle of the night...
Joined: 17 Feb 2009 Posts: 153 Location: adelaide sa
Posted: Thu Jul 16, 2009 10:11 am Post subject:
LewyTheFlyJZS147 wrote:
the length of your post doesn't increase the accuracy
power mode = more fuel consumption
higher revs = higher injector duty = more fuel consumption
length of my post wasnt intended to increase accuracy.. ha ha..
i disagree that in everyday driving, at moderate throttle settings power button equals higher fuel consumption, and i base that purely on my experience with the 12 auto and manual cars that i've owned, particularly the R33 i had that used 16l per 100km with an auto box, which dropped to 13l per 100km when coverted to a manual gearbox with no other mods, the fact that the aristo i own myself uses less fuel when driven in the same spirit and shifted manually at higher revs (down to 14-15 ltr per 100km as opposed to the 17-18ltrs it uses in ECT/PWR-off mode to do 100km), and countless tests in every motoring magazine across the world that proves beyond doubt that manual cars, which generally run at higher revs before gear change than an equivalent auto car, use less fuel...
mate it's one of those subjects where everyone will always disagree... redheads vs blondes/ turbo Vs superchargers/ riding scooters or sleeping with fat chicks, which is less embarrassing? etc etc... i've just found with this particular model of car, it uses less fuel with the pwr button on... which will probably also vary car to car, and driver to driver...
all you have to do is check out the "K's to a tank" thread to see that every car on here gets different economy... _________________
Withus, goest thou australia, in your bumpy cars, in the middle of the night...
Joined: 14 Mar 2008 Posts: 668 Location: melbourne
Posted: Thu Jul 16, 2009 10:20 am Post subject:
manual cars have less drive train losses.
(may also weigh less)
rate of change is an important issue with fuel consumption.
(think EVO...)
that is changing engine speeds rapidly.
Joined: 17 Feb 2009 Posts: 153 Location: adelaide sa
Posted: Thu Jul 16, 2009 10:23 am Post subject:
LewyTheFlyJZS147 wrote:
mate i have checked out the k's to tank
i drive about 20mins to and from work each day and it gets far less mileage in power mode, ive tested it
forget about manual cars
we are talking about the aristo auto in power vs economy
how about someone else has some input because this is just gonna go back and forth
yeah fair call re manual cars.
ok, discussing specifically aristos, between pwr mode on and off, mine uses less fuel with PWR on...
but yeah, like Lewy said, anyone else wanna weigh in on this one, i'd be interested to know if anyone else finds their car uses less fuel with PWR on? _________________
Withus, goest thou australia, in your bumpy cars, in the middle of the night...
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