Bad Fuel Economy

[mass_iv]

Hey guys,

i have a small problem at the moment with my cars fuel eating habits. ever since ive had the new upgrades, i would be lucky to get say about 220kms from a full tank......

i have noticed that it spits out a little black smoke when you give it a hit as in high in the rev range, but i just figured it is running a little rich. there is also a petrol smell, also it back fires a lot more.....

ok im just wondering peoples thoughts on this, and if i should invest in another tune, any ideas on how much a small and simple tune like that would cost????

cheers

Mass

[R31Nismoid]

do a search i think would be best for this one

There will be many little different things.

They have all been covered @ length

fuel reg/tune/o2 sensor etc etc

[mass_iv]

yeh i figured that it maybe things like that, but the thing is i have a new o2 sensor, new fuel reg, and i just had it tuned, thats why i was thinking its prob the tune...

the reason for this thread is i was after some thoughts/comments from those who have similar mods to me, and how their fuel economy is, in other words what i should be expecting..

[paulr33]

the tune will be for WOT max power most likely and they havent touched or checked light load AFR's

[mass_iv]

i dont know if was for max power as it runs rich. there is also a small flat spot at about 2000rpm...

[WetGTR]

yeh i figured that it maybe things like that, but the thing is i have a new o2 sensor, new fuel reg, and i just had it tuned, thats why i was thinking its prob the tune...

the reason for this thread is i was after some thoughts/comments from those who have similar mods to me, and how their fuel economy is, in other words what i should be expecting..

<{POST_SNAPBACK}>

Better fuel economy then what your getting!!!

If its recently been tuned maybe speak to the tuner and get them to check it out. Backfiring, popping & black smoke are all tell tail sign of it running rich. There might be other factors to consider - did this suddenly happen or was this straight after your tune.

Something like your O2 Sensor, Airflow meter, Fuel Reg, vacuum leak, clogged injectors could be having an effect.

If straight after your tune - speak with them as a re-tune is needed or the fault has to be found before this can be sorted.

[mass_iv]

Better fuel economy then what your getting!!!

If its recently been tuned maybe speak to the tuner and get them to check it out. Backfiring, popping & black smoke are all tell tail sign of it running rich. There might be other factors to consider - did this suddenly happen or was this straight after your tune.

Something like your O2 Sensor, Airflow meter, Fuel Reg, vacuum leak, clogged injectors could be having an effect.

If straight after your tune - speak with them as a re-tune is needed or the fault has to be found before this can be sorted.

<{POST_SNAPBACK}>

yeh it was after the tune.. i can eliminate all those factors, as i have all the following new:

Air Flow Meter, 550cc injectors, Fuel Reg, o2 sensor, and new vacuum lines....

i think i have to speak to the tuner, it does pop and crackle a lot...

[R31Nismoid]

just cause parts are new doesnt mean much.

if the odd chance one is faulty... well.. you know the rest

[mass_iv]

any ideas on how much i should be getting out of a full tank?

as my signature states, i have a GT30R with almost 250rwkw.....

[WetGTR]

You might have 250rwkw but this dosen't mean you should have bad economy.

If everything is working, correct installation, a good tune and good driver behaviour your fuel economy should be good, I believe 400+ km at least, some people I'm sure are getting alot more or a bit less.

[mass_iv]

yeh i thought so, i was thinking arond the 350 mark should be right, so u guys think i should get it re-tuned? or take it back to my prev tuner?

[WetGTR]

Take it back to where you got it tuned.

Give them the chance to help you, hopefully its a simple problem and they might be more then happy to help. I might be too optimistic but I hope they don't want one of the cars they have tuned runing like that.

If not, then you can cross that bridge when it comes but I'm sure there are some reputable tuners that will get it right.

Your car runs as good as the tuner that tunes it!!

[mass_iv]

thats so true, im sick of cleaning the black residue off the back bumper and boot.

[R31Nismoid]

it depends on how you drive it mate.

i can get 200 to a tank or 400+, its all in how you drive it

[mass_iv]

yeh i know that, trust me i dont drive it hard at all, maybe every now and then ill give it a hit.

[R31Nismoid]

put a full tank in and dont hit it once

like, really concentrate or let your mrs/mum drive it for a week and see what they get.

For ages i could neve get over 300, stuck the mrs (at the time) in the car... 440 right off the first tank. Ive never beaten it yet!

[WetGTR]

Well said!! ^^^^^^^ ^^^^^^^^^

I say let the mum drive it!!!

[MYS013]

Can you PM me who tuned it please?

[mass_iv]

MYS013 ill get back to u on that

[mass_iv]

and trust me i dont always give it a hit, u cant drive it any diff, it just chews fuel....