HondaTec521

Most fuel injected engines go out of closed loop at WOT.The PCM dumps extra fuel for max. acceleration.

kyle_22r

and remember, efficiency doesn't necessarily mean good mileage. the engine may be making more power out of a given amount of fuel at WOT, but you're going to be burning more fuel anyway

Yamaha+Toyota=Fun

I know a few guys from my work (shuksan golf course) that are juniors at western, just thought that id ask if you were one too!

Kyota

That seems to make sense. Although I think that you would accelerate quickly to the desired speed, then, of course, put on cruise, haha.

As someone else said, because of resistance, you get better milegae going slow. Thats what my old 90 Toyota showed too driving in low for about 3/4 tank of gas on dirt roads (30mph and slower).

ewarnerusa

Yes, exactly. More efficient meaning more hp/fuel used, not necessarily more miles/fuel used. I'm an air quality emissions engineer and the natural gas compressor engines that I often test should be run under a high load to achieve the most efficient cumbustion and therefore lower NOx and CO emissions.

mtxride

I hear ya there. It seems like I get the best gas mileage when I'm wheeling around in 4 low too.

Flamedx4

The problem is that even if the engine is more efficient at WOT, you aren't able to effectively USE all that power so you are wasting it and getting poor net mpg.
This is why a small car with a small engine (working harder!) still gets better mileage.

A 'practical' application of this info would be: determine how much horsepower it takes to maintain a steady speed - say 70 mph on the highway. For argument let's say it's 25hp. Put an engine in the car that makes 25hp at WOT. You'll utilize it effectively and get great mileage on long trips. (It'll just take forever to GET to 70 mph, and suck the big one on hills etc....)

Utililizing resources efeectively is not the same thing as utiltizing at their maximum efficient yield - witness my wife's spending habits relative to our credit cards.... :pat: Buying EVERYTHING that's on sale is NOT as efficient as only buying only what you need and only when it's on sale, keeping the rest of your credit power in reserve...

Glenn

4lo will give you less than half the usual mileage because of the gear reduction. My friend had a Jeep Grand Cherokee with a trip computer, and we'd watch the mileage go way down when off-roading in 4lo.

Flamedx4

I think mtx was using something called humor....

Kyota

SO are you saying that Toyota odometers only register properly when they are in high? Haha, I dont think so. So going in 5th high at 3000 rpms is what, arounf 65 mph in my 90 yota. In low, 5th gear about 3000 rpms it goes right around 30. So while you are going down the road in 5-low at 30 mph, the odo moves like you are on the highway? hahahah...yeah...

larsmith

my wife's 2004 honda crv on a trip gets 27 mpg if you stay under 80 miles per hour, anything over that gives you 23 mpg.

ewarnerusa

Wow, old thread resurrection.
I have an '03 V6 TRD Tacoma now since this thread was born. I pretty consistently get 17-18 mpg with mix of city and highway. All highway will flirt with 20 mpg if I keep it at the speed limit or less. Best ever was 24 mpg while cruising for a day at 55 miles per hour speed limits. Totally stock truck, Amsoil oil and air filter. Not much speeding or heavy accelerating.

TacoFitz

I read an article about this, and the conclusion was that wot short shifting produced the best gas mileage. They also put it this way, by doing that you get to your cruising speed quicker, better mpg.

BigBallsMcFalls

doesn't work on the 5vzfe


the most efficient rpm range is 1800-2400 rpm


doesn't really work anywhere. strap computers to your engines and go for some real driving tests before posting garbage

talk to the hypermilers. wot is never, ever good. ever. http://www.hypermiling.com/

TacoFitz

Who pissed in everyones cornflakes?

DailyDrive

Nonsense. The real reason why everyone gets better MPG when taking it slow is because the fuel/engine controls are SLOW, even on the most modern cars. Going through cycles of rapid acceleration with a system incapable of keeping up is pointless. Cruising on the highway yields best MPG because the readings from all sensors settle down and are constant.

Drive on the highway at 65, take foot of gas, get to 45, accelerate back up to 65, take foot of gas, and so on. In theory this exercise should require the same amount of energy as traveling at a constant 65, but in practice, you'll get much worse MPG for the reason explained above.

TacoFitz

http://www.roadandtrack.com/article....&page_number=3

This may not go for every car but in road and track's test this proved the best mpg.

jakob_in

Can someone give me a clear explaination on this idea of WOT? Do they mean, literally, wide open throttle; as in peddle to the floor board? The only thing I can equate this concept to is a dirt bike- where the trottle is kept wide open with only a quick snap of the wrist to cut fuel when shifting. And, as such, do not see how this is at all possible in any normal vehicle.

What I can understand is the height of theoretical efficency on an engine racing to, but not beyond, it's optimal RPM. Without knowing the optimal RPM for a particular engine, I see no relevance to a WOT application as torque rises and falls throughout the RPM spectrum.

The R&T article seems to elluded to this by mentioning short shifting, modest throttle and appropriate gear. The better information, in my opinion, is listed on the preceeding page: "Power requirements grow with the square of vehicle velocity".

Anyway, someone set me straight if I'm reading into this wrong.

88alltrac

at WOT the engine is most efficient. not in mpg but in making the most power with a certain amount of fuel.
i dont see how you could cruise at WOT. you would either keep accelerating and hit the rev limiter and then have to let off the gas or you would be lugging the engine. I can tell you from experience that lugging it at wide open throttle is not very good on gas mileage. I just dont think it is possible. I guess when I am peddle to the floor lugging it along I am probably making the most power possible though in that gear.
and yes drag goes up with velocity squared meaning

88alltrac

oh yea. and really old thread too.