Corolla Ae 110 Fuel Consumption Issues?

[lkshan]

Dear Friends,

I owned Toyota corolla ae110(L-Grade) 1998 model which is automatic transmission. the problem is it does 9km/l maximum in city area. everybody says this model does 12km/l.

I have tied to driven it by changing different methods like managing the RPM, controlling the speed & gear shift timing. but the problem still exist.

I kindly requesting advise & Help from you experts to get my problem fixed.thank you in advance.

some more details as follows,

Engine-5A FE (done 200,000km)

the repairs recently have been done

Engine tune up

fuel filter & Air filter replacement

Timing belt replacement

(mechanic said the spark plugs can do some more KM as it still show pure white on the ceramic tip without any sign of worn but one more thing that i can see the distributor has been adjusted(advance) more than 3/4)

Edited November 14, 2012 by lkshan

[chan5]

@ chan5,

thanks for the informative reply.

Is there any formula for friction which include surface area?

As far as I know static and kinetic friction only differs because of "U" (coefficient of friction) not the surface area.

The wider tire in off road use is probably because they are not sinking in mud.

And the tire surface is NOT moving relative to road surface in a given point unless the tire is slipping.

Just see following link

http://ffden-2.phys.uaf.edu/211_fall2002.web.dir/ben_townsend/staticandkineticfriction.htm

Yes, correct facts and wrong application i guess.

1 - wide tyres in off roaredrs reduce pressure on surface so it doesn't sink easily, (you may notice that driving in sand needed less air pressure , just to wider the tyre ).

And yes it increases the limiting frictional force.(that ú depends on surface nature)

2 - when driving , the friction acts along the way car drives , ex-forward when you drive forward.

So yes, engine produces the power and force for it,in case the friction higher, yes the fuel consumption drops.

(you can experience this when using a wider tyre , it always reduce the fuel efficiency)

3-yes , limiting friction is the one which holds the car down to road, not the static(dynamic) friction.

[Charith H Jayasinghe]

Nano31,chan5, congratulations to your physics explanation +1 for that.

I like to add some and correct me if I'm wrong.

1. When using wider tires their weight high and as more constituents at the outer area makes tire angular momentum high which makes it needs more energy to rotate.

2. Tire, specially radial won't work as exact circle at its bottom become flat therefore continues change in shape will happen so when it comes to lager and wider that will waste more energy.(IMO tyre noise also waste energy)

3. Wider surface contact itself, according to Web as well as in physics mildly affect fuel consumption but but will increase traction depending on the constituents and tread pattern specially on wet surface (IMO I think that will help to keep coefficient without letting drop or might increase) therfore handling.

http://m.voices.yahoo.com/how-wider-tires-effect-cars-fuel-economy-handling-3973758.htmlhttp://www.waltersforensic.com/articles/accident_reconstruction/vol1-no8.htm

Any corrections opinions accepted.

[Rumesh88]

Nano31,chan5, congratulations to your physics explanation +1 for that. I like to add some and correct me if I'm wrong. 1. When using wider tires their weight high and as more constituents at the outer area makes tire angular momentum high which makes it needs more energy to rotate. 2. Tire, specially radial won't work as exact circle at its bottom become flat therefore continues change in shape will happen so when it comes to lager and wider that will waste more energy.(IMO tyre noise also waste energy) 3. Wider surface contact itself, according to Web as well as in physics mildly affect fuel consumption but but will increase traction depending on the constituents and tread pattern specially on wet surface (IMO I think that will help to keep coefficient without letting drop or might increase) therfore handling. http://m.voices.yahoo.com/how-wider-tires-effect-cars-fuel-economy-handling-3973758.htmlhttp://www.waltersforensic.com/articles/accident_reconstruction/vol1-no8.htm Any corrections opinions accepted.

Just to add my 2 cents

1. Correct but it is the inertia (I) NOT the mass (m) (although for the identical profile the wheel with higher mass would have more inertia) that matters in angular kinetic energy.

2. In addition a greater portion of energy loss on a rotating tyre is due to the standing wave which form on the side wall. For example - http://www.etyres.co.uk/glossary-tyre-terms?term=standing-wave

3. Correct.