...so what am I looking at and what does it mean in relation to the discussion (if anything?)

perhaps this explains it better

Now I understand! How clear it is! Thanks! Horray!

Vain

Cheers Will!!! It's good to know there are people that can turn technical rubbish into useful information :P

well, so many of my posts on this forum are useless, i thought i would make a useful contribution once in a while

glad i could be of assistance

Quote:
Originally Posted by T.K.Jode
Has anyone else noticed that leaving the car idle will not use ANY fuel?

I left a FXR sitting for 30-40 minutes... not even a .1% change.

Quote from Bob Smith :

Really? It does for me. Even back on 0.5L I remember the engine stopping about a minute after I'd parked up after a race had finished. It is of course very slow.

I noticed this too today as I took my LX6 out of pits and left it there during qualification for about 20 minutes. No fuel comsumpted meanwhile... Maybe this takes effect only if you leave the pits and dont move your car...
Doesn't affect to racing so I wouldn't be too worried

Quote from Bob Smith :

...so what am I looking at...

It tells you how much fuel the engine is using in all possible states of operation. For example in the point that is marked "7kW/80km/h" the engine is outputting 7kW at 2000rpm and is using 600g of fuel per kWh. Push the throttle more and you have to move up on the graph. The best efficiency is achieved at 2900rpm, very close to full throttle.

Quote from Bob Smith :

...and what does it mean in relation to the discussion (if anything?)

LOL, I'm not really sure. I just think it's interesting to see how fuel consumption works in the real world. Here are two things you could do if you were really bored:

1) calculate the fuel mileage for a full power, top speed run.

2)output a FZ50 (closest to v6) Blackwood raf to Excel and use the torque and rpm values to calculate the fuel consumption for the Opel V6 then compare with LFS.

I don't know a reason why this would be worthwhile though, especially since you would have to somehow get the jpg data into Excel first.

Quote from ayrton senna 87 :

perhaps this explains it better

I knew someone would get it without further explanations.

Quote from Mauni :

Quote:
Originally Posted by T.K.Jode
Has anyone else noticed that leaving the car idle will not use ANY fuel?

I left a FXR sitting for 30-40 minutes... not even a .1% change.




I noticed this too today as I took my LX6 out of pits and left it there during qualification for about 20 minutes. No fuel comsumpted meanwhile... Maybe this takes effect only if you leave the pits and dont move your car...
Doesn't affect to racing so I wouldn't be too worried

i've run out fuel idling when i had my fuel set to be almost empty at the end of the race.

speedfreak227

Generally speaking ANY internal combustion engine is most efficient at peak torque at Wide Open Throttle (WOT).

It's a huge influence on road car engine design and gearing considerations.

Quote from tristancliffe :

Generally speaking ANY internal combustion engine is most efficient at peak torque at Wide Open Throttle (WOT).

It's a huge influence on road car engine design and gearing considerations.

I get really annoyed by people that don't get this important concept you've just hit on the head and assume throttling losses are small. One is a degreed engineer. Go figure.

In practice, many modern engines tend not to be least thirsty at WOT because of open-loop fueling. They tend to work best at that point right before the ECU goes open loop. Full throttle-closed loop is only some new EPA regs away for some of us. Not a good thing for an enthusiast.
...
Re: this thread in general:

I don't think the fuel consumptions for LFS are all that accurate, but I do think a lot of people that have posted here are clueless about the fuel consumption involved in racing....any motor burns a lot of fuel run flat out for any modicum of time.

I just calculated fuel burn for an FV8 on KY Oval because its the simplest case. Gasoline is assumed at 6.35lb/gal, therefore one liter is about 1.677lb, the FV8 world record setup burns 1.875 liters on one hotlap. With a BSFC of .4 (typical for modern racing engine, super high end motors may dip below this) the FV8 is calculated to be producing ~700hp. If you move the BSFC to black-smoke belching turbocar range, it seems more accurate. I haven't tested any other cars, itd be interesting to see the results.