Fuel Consumption

[chuboy]

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Originally Posted by Riet

he tuned it badly then because fuel consumption almost directly relates to weight and power.

Actually you'll find it can be affected more by wind resistance. Putting an RB20 into a van with no aerodynamic styling will use more fuel at a given speed than an aerodynamic sports car of the same mass.

Weight and power are the same, but the faster you drive, the higher your fuel consumption.

Of course driving style affects it the most - driving a 4WD can use the same amount of fuel as a Falcodore depending on how much you know about combustion and energy use.

[seremify007]

Agreed it's the driving style which matters the most. Tuning can be done to make a car fuel efficient or it can be done to be very wasteful. Depends on the intentions.

[Riet]

True, but wind resistance isnt as important at low speed and most people are talking about city driving. Point is that if his skyline is getting 20L/100 km while driving normally it hasnt been tuned well.

[chuboy]

Originally Posted by Riet

True, but wind resistance isnt as important at low speed and most people are talking about city driving. Point is that if his skyline is getting 20L/100 km while driving normally it hasnt been tuned well.

Agreed 20L/100 is a bit high but also remember that if he has gone to the trouble of tuning his car it's likely that he likes to drive it like a tuner car, i.e. hard acceleration etc. Frequent acceleration like that, especially in the city where the traffic is very much start-stop, could quite easily see you pulling14-17L/100, particularly with a high-capacity engine.

[Riet]

No shit, but why would you say what it does when you drive stupidly? A stock skyline will get 20L/100km if you floor it all the time too.

[chuboy]

Originally Posted by Riet

No shit, but why would you say what it does when you drive stupidly? A stock skyline will get 20L/100km if you floor it all the time too.

Maybe he doesn't think his driving is stupid? If he was asked what kind of consumption he gets in his car he's hardly going to give you an adjusted figure, he'd just tell you what his consumption was.

Kinda pointless saying 'I'd get 13L/100 if I drove slowly', so what? I could say 'I get 0L/100 if I dont drive at all', which is true but doesn't answer the question.

[Riet]

Driving normally is kinda implied.

[seremify007]

Most cars will do 20L/100km if you floor it the entire way I'd imagine...

... but I agree with Riet. We're talking average consumption typically and that involves some connotation of normal regular driving on streets (as opposed to on a track or drag strip... or Parramatta Rd).

[chuboy]

Originally Posted by Riet

Driving normally is kinda implied.

Can I suggest the possibility that 'normal driving' for the Skyline owner might still be considered to be inefficient?

I'm not defending anyone here, all I'm saying is 20L/100 from a tuned Skyline doesn't sound extraordinary.

[seremify007]

Originally Posted by chuboy

Can I suggest the possibility that 'normal driving' for the Skyline owner might still be considered to be inefficient?

I'm not defending anyone here, all I'm saying is 20L/100 from a tuned Skyline doesn't sound extraordinary.

My family has an R34 GTR V-spec and it can drop down to 12-15L/100km with normal driving.

[Riet]

*facepalm*. You're missing the point. Since the aerodynamics aren't changing if it's using that much fuel in normal driving it has been tuned badly.

[Zozo6969]

a tune should really give better fuel economy if its done correctly. most cars run a little rich when theyve come out of the factory and a tune will tend to make the engine run more efficiently

[seremify007]

I've heard the MRT tunes for Subes and Mitsus yield both improved HP and fuel consumption figures!

[David Spade]

my car runs primarily off hopes and dreams and some petrol

[David Spade]

iits like a 70:30 split