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Excess Fuel Consumption

Houdini
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andy65b Veteran

andy65b

Posted
Posted
hmm i bet that suspension was fun andy! lol

most fun I have had in a long time in the car. 25kmh hairpins and 45-55kmh narrow bends.... manual in 2-3rd all the way. So much fun steering with the right foot.

Angus Smart Grand Master

Angus Smart

Posted
Posted
I got around 8.5-8.8km/L on the trip to the snow on the weekend and that included some really fun driving coming back from Mt Selwyn. 25km of winding roads up and down a valley around the Tumut dam. Then off on another 120km of back roads with logging trucks doing 115km/h so over taking was fun.

I then filled at Goulburn, set the cruise on 120km/h and got 11.4km/L back into Sydney. Got to love that.

But it is going down fast now driving in Sydney traffic again.

good to finally meet you too :D

will be back down there this weekend.. midstation at 10:30 if your around haha.

i had a good run back on sunday 3h50m berridale to sydney ;)

andy65b Veteran

andy65b

Posted
Posted
good to finally meet you too :D

will be back down there this weekend.. midstation at 10:30 if your around haha.

Yes, good to meet you also.

Not this week but I will be back down in the next 3 weeks. I have some new boots to show customers.

My way back was not short and also sent the wrong way which got me on this great road so it was soooo much fun even though I was driving all day.

LordMidol Collaborator

LordMidol

Posted
Posted
Yeah, that's about what I am getting at the moment with city driving and giving it a bit of stick here and there (gotta test if the CAI makes a difference... over and over and over :) )

I mostly lose fuel when someone else drives my car, sister and mum both have lead feet. If they owned my car I doubt they'd even manage 400km to a tank ;)

Most of my driving is from Mapleton -> Noosa Heads. So about 1/3 of it is highway, the rest depends on how many knobs are on the road to slow me down.

pyro-ns Community Regular

pyro-ns

Posted
Posted
I mostly lose fuel when someone else drives my car, sister and mum both have lead feet. If they owned my car I doubt they'd even manage 400km to a tank :ninja:

Most of my driving is from Mapleton -> Noosa Heads. So about 1/3 of it is highway, the rest depends on how many knobs are on the road to slow me down.

so far i think we're gonna struggle to make 450 :P unless the girl's been flogging it, i've only punched it twice up to 100 :P

  • 4 months later...
pixel8r Mentor

pixel8r

Posted
Posted

Thought I'd dig up this old thread...

Went from 14.4L/100kms to 13L/100kms just by putting new tyres on the car. The old ones (Firenza = crap) made a lot of road noise and basically would've had higher rolling resistance. The new TOYO's are super comfy and quiet too. Highly recommended!!

I'd still like to improve on 13L/100km if possible - just because that was kind of a "best case" figure - after babying the car around for a week.

I recently came across a thread in the V35 section talking about all the carbon build-up in the intake manifold and how it can affect things like power and fuel economy. I intend to try the "subaru upper engine cleaner" sometime to see if that helps without having to take it all apart.

Today I grabbed some caltex techron 5000 ($13 from any caltex servo) and put it in the tank to see how that goes...

Apparently this stuff is also added into Caltex Vortex & Vortex 98 fuels (in much smaller qtys) as a cleaning agent - maybe why some people mentioned black stuff coming out the exhaust when using this fuel?? Could be cleaning all the crap out of the engine?

The caltex down the road from where I live has just got Vortex 98 so I think I'll give that another go to see if it improves with ongoing use.

Just some little things that should hopefully clean up the engine internals :) can only be a good thing.

Has anyone else used the subaru upper engine cleaner? where do you spray it in? is there any reason not to use it on the M35?

ssshonky Grand Master

ssshonky

Posted
Posted

I'm with him ! :D

See the Stagea Dyno thread and you can see how rich some of the Stageas get when they are approaching max boost. Bear in mind running rich= less power :) and less $ in your wallet

we are in the process of trying to get ours to do better than 16.4 L /100k :woot:

go look at the dyno graph and come back here to laugh :)

BP ultimate, Mobil Synergy 8000 or Shell Vpower are the fuels to use

Id strongly suggest replace the oxygen sensor, reset battery/ecu, and then get it on the dyno with a reputable workshop to see why its chewing so much fuel.

pixel8r Mentor

pixel8r

Posted
Posted
I'm with him ! :D

See the Stagea Dyno thread and you can see how rich some of the Stageas get when they are approaching max boost. Bear in mind running rich= less power :) and less $ in your wallet

we are in the process of trying to get ours to do better than 16.4 L /100k :woot:

go look at the dyno graph and come back here to laugh :)

I've run nothing but BP ultimate in it, at least for the past 3 months.

ECU has been reset recently - no difference.

Only thing I can try is o2 sensor - but I'm guessing that is near impossible to do myself on the M35 - can anyone confirm this?

Other than that, its really not worth my while taking it to a workshop for the sake of hoping for ~1-2L/100km improvement - which is why I was looking at DIY options...if I cant improve it I'll just put up with it.

I've heard a LOT of good stuff about the subaru engine cleaner. I'll give it a whirl next service - which should be due in the next few months.

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