audio = 100ks less per tank??

[revhead2011]

hey guys and girls, about a month ago i installed a half decent audio set up in my VY S II and since then i have noticed my distance travelled per tank has dropped a fair bit.
i always fill up with 95 fuel, i used to get anywhere between 450-560ks per tank before i would fill up depending on how "interesting" i made my driving haha.

after the sound went in im only getting low 400's - 460ks per tank which is really sad for me so if anyone can help out why that would be great

cheers guys and girls of just comm!

[Nic92]

i have no idea lols, maybe the alternator is more stressed to power the audio, which uses more fuel, like using more acceleration to charge quicker, idk its only my guess im probably wrong haha, good thread thou, i think there was a thread while back on this topic

[sweefu]

a half decent audio set up

What is in a half decent audio setup? I'd say its a coincidence. The only real thing could be a little more fuel consumption due to more strain on the alternator, but that should only be if you are running something to massively drain current (300amp plus draw) which is highly unlikely. Or the extra weight which again, would be fairly unnoticeable unless you have a few hundred kg of stereo in there, which again is unlikely. What components are you running? May as well ask.

[wraith]

Your alternator doesn't have a clutch so is active all the time so I fail to see how it can be the cause. What it most probably will be is you not keeping an eye on revs etc while your driving.

[aaronevolution]

How much does this set up weigh? Adding even 100kg would throw out your consumption a little.

[sweefu]

Not 100km per tank.

[CORNYY]

Hahha this is such a funny thread!

How much does it weigh? That could be a issue
Maybe also with your blasting sound you are now driving with your window down making sure everyone can hear an this is creating wind drag?
Goodluck! This seems crazy

[calais24/7]

as if it could give you 100 kays less per tank

[MAG00]

Fully sick subwoofa = tough as driver = lead foot = more consumption? Ayyyyeee.
In all seriousness, have your driving methods changed since installing the system?

[Nic92]

MAG00 sounds stoned LoL.

[wraith]

MAG00 sounds stoned LoL.

All these car audio threads have driven him to it.

[MAG00]

MAG00 sounds stoned LoL.

That was the general idea haha

[Jesterarts]

I have 2 suggestions.

1. How much does the system weigh? This could account for part of the decrease.
2. In order to install the system would would have needed to disconnect the battery, which would reset the ECU. I remember that with my VX whenever I disconnected the battery for an extended time the ECU was reset or whatever and for about the first tank of fuel it would drink more.

[revhead2011]

wow wasnt expecting so much feed back but thanks everyone for your comments and wow there are some funny ones in hear hahaha!
ok,
my sound system does not weight +100ks lol
im running:
- alpine cda117e headunit
- JL front components c2-600
- JL rear 2 ways c2x-600
- JL 5ch 700Wrms amp
- Polk MOMO 12" 425Wrms sub
- dynamat in front doors and boot lid
- custom ported box (big btw, takes up half the boot but not that heavy, pics on "my ride thread")

at first i thought it was the alternator, but then i quickly threw that idea out the window cos the alternator is being powered by a pulley which is driven buy the engine revs which can only change with my foot, not my sound system.

i know all about this learning computer in the vx/vy onward commodore models and it should not effect my fuel that much. i have filled up at least 6 times since the stereo so my car has had plenty of time to "re-learn"

and i do like to have fun occasionaly il admitt that so revs can get pretty high, but only sometimes!! not all the time!! i seem to look at my revs alot while i drive, car tends to change into 2nd at 3-3500 rpm when i leave the lights and 2-3000 rpm for every other change depending on how hard i push my foot down.

im really confused about this fuel thing, im one line off the half way mark atm and im sitting at mid 200Ks so far which is good but... i have been doing alot of continuos high-ish speed drives along highways and through 70+km/h zones lately so il keep everyone updated as to how many ks i get to this tank.

thanks for all the input, keep it coming!

[sweefu]

I'd rule out the stereo as the cause of your bad fuel consumption mate.

[revhead2011]

Yeah, I'm hoping outs not my stereo because if it is that would be pretty stupid. It had just occurred though just as it was all installed do just throwing s possibility out there.

[drift-it]

i get 3-350 around town! sound system and all do i have the same problem.......actually now that i think about i like boost whine right foot is to blame for me

[revhead2011]

Well of I had a supercharged v6 I guess I would have that problem too haha, but I don't so it must be something else

Sent from my GT-I9100 using Tapatalk

[drift-it]

maybe you need one of these

eBay Australia: Buy new & used fashion, electronics & home d

[revhead2011]

Bahaha what the hell is that lol. Anyone who believes in that crap should honestly not item a car haha

[johnno010684]

maybe you need one of these

eBay Australia: Buy new & used fashion, electronics & home d

if i install ten, will my car run 10's? haha

[revhead2011]

Ok, I filled the car up to day. I was suprised to see that I got 480ks to this tank but... I had to drive like an 80 year old woman to get that? I never used to drive like that and I would see 500ks sometimes before filling up. I don't know what had changed to effect my fuel like this??

[mint]

Mate, seriously. Just listen to your ipod, and turn the thing off for a tank and measure the difference.

Anyone who thinks the alternator's load on the engine doesn't change because the alt is not clutched is, well... wrong - or worse.

[DmanVT]

i highly doubt it is the sound system unless as most people have said your foot gets heavier when listening to music that gets you pumped up, but also the large power being drawn could be a problem... possibly.

An alternator is just a coil of wire and magnet basically, As you increase the power being drawn, the alternator becomes more difficult to turn, ( F=NxBxIxL ) and therefore the computer needs to put in more fuel to turn the alternator at the same rate. This means you don't need to be putting you foot down for it to be using more fuel.

Maybe invest in a capacitor? like i said i'm not 100% sure but large current or power being drawn can result in larger fuel usage.

sorry if i'm wrong but just a suggestion/thought

Cheers

[wraith]

i highly doubt it is the sound system unless as most people have said your foot gets heavier when listening to music that gets you pumped up, but also the large power being drawn could be a problem... possibly.

An alternator is just a coil of wire and magnet basically, As you increase the power being drawn, the alternator becomes more difficult to turn, ( F=NxBxIxL ) and therefore the computer needs to put in more fuel to turn the alternator at the same rate. This means you don't need to be putting you foot down for it to be using more fuel.

Maybe invest in a capacitor? like i said i'm not 100% sure but large current or power being drawn can result in larger fuel usage.

sorry if i'm wrong but just a suggestion/thought

Cheers

I love misinformation. Please enlighten me how the alternator can cause more strain on the belts when it's spinning at a fixed rpm in accordance with the motor. I'm pretty sure if the tension changed even just a little bit it would throw everything out of whack.