Power/fuel usage at various speeds in an 80 (1 Viewer)

[turbocruiser]

I guess I shouldn't tell you that I've filled it 512 times for a total of 8,958 gallons then, should I?

Wow, I'm humbled and happy; humbled that someone out there is even more anal than myself and happy that I can tell my therapist to fawk off now that I know that!!!

 

[Gold Finger]

I log every tank of fuel noting gallons £cost and milage and then calculate the consumption since owning the vehicle. a few have been missed by my wife and she was told off especialy since on those occasions she drove very steadily inside the legal limit on long trips and a good opertunity was lost I thought for calculating will being driven carefuly. I have one figure for here localy at near to 22mpg imp

 

[perk]

I think that driving at where the maximum torque of the engine produces the best fuel efficiancy and ideally this would be at a speed that does not require to much power to overcome drag. So it is a ballence. Torque bands are reasonably broad so finding a suitable turing speed should be easy enough. It may be easier on the diesles perhaps as the band peaks at about 1800 rpm with 266ft-lbs.

Anyone know what rpm/torque the gas powered FZJ80 engine has the easiest time running at?

 

[IdahoDoug]

Perk,

No such thing as "easiest time running at" though I heard it alluded to earlier. An engine has outputs measured as torque and horsepower and these vary by RPM. I do know that Toyota Australia was sued over the introductory ads for the new 1FZ because the copy claimed (rightly) that the new LC engine put out more torque just above idle than the Land Rover V8 produced at its max. Heh.

DougM

 

[Beowulf]

Here is the torque curve for the 1FZ-FE

-B-

 

[Gold Finger]

Here is the torque curve for the 1FZ-FE

-B-

The legend Beowulf, has shown on his reproduction of the torque power graph that the engine has a broad spread of torque between 2,000 and 4,000 rpm and if the engine was kept between these revs then it will produce good efficiency but the best efficiency is probably about 3,200 or 3,300 rpm as torque appears tok earehe G. phracas ben l atlitmie easlngdiec bseauf oe thosch senlecahi w mch eayhampzesiha cctraisercstio titsu m aufantuacs remsai M. ufantuacrsreav hgee raney llfia tixa oonman muxiHPm hi w ichres lyalea mngnissleor fhe taj mitorofy se u arswes en tnod tot ti s acktht Rat aPMits il wmel banh otinmaintag inarneo tximam mum rpd anhia sghedpesp eiaecy ll ainow pfuercal ir,alde mlyimax tumquorwie blldee gnsi tedcoo esrrndpoit wa h odgond ase ul fuurtog ineespthd iatses ibns tlemao tain, in lisalegnd as it no fsot as tasino r cugehura dwhg h ic aweeegread ierlinr eacrs sepoexntnelliawiy sthedpe I. ist bo a eutcaduontiwh, matteat trsuso os most IMHO is a broad torque distribution which enables a larger choice of speeds and not to peaky so it is easy to find and maintain, and a sensible RPM for this torque to appear at, it would be no good for you in the US or here in the UK if that was at 100mph or more, maybe in Germany on the Autobahn perhaps. Maximum torque is also were the engine feels happiest.

 

[perk]

No such thing as "easiest time running at" though I heard it alluded to earlier. An engine has outputs measured as torque and horsepower and these vary by RPM.

ok...how about when considering fuel usage? Does more torque equal less fuel used? If so, is the best way to use the least fuel while around town driving, to quickly get the rpm's and torque built up, then start feathering and coasting as much as possible?

 

[Beowulf]

Perk,

You're thinking about this waaaay too hard. To improve mpg, do a good tune-up, clean your fuel system with something like Red Line, air up your tyres to 50 psi, remove all unnecessary weight from the passenger and cargo areas, run street tyres, remove air drag (no lift, no rack.) Drive like an old grandma.

You can hook up one of those amber/green LED vacuum gauges and try to keep it in the green. They came on mid-80's Caddy's.

-B-

 

[landtank]

With my up coming injector swap I put my summer tires which are 315s BFG AT/Kos back on and checked them at 45psi. I ran a couple tanks of gas through the truck and just finished a 300 mile drive yesterday. Got 15.2 mpg at speeds of 70-75 through some hilly terrain. We'll see how the truck performs after the swap.