View Full Version : fuel economy problems
wastedhello
12-11-2007, 01:15 PM
well I've ran out about half a tank now with my new pod box and EZ boys pipe.
before i did this i was getting about 12.5L/100km now I'm on about 16L/100km
is this because the ecu needs to adjust to the new intake or does it mean i have a problem with a leak somewhere?
mad082 magna
12-11-2007, 01:26 PM
well it will be because of 2 things. 1: you are probably giving it more gas to feel the power. 2: the more air you let into the motor, the more fuel that has to go in to keep the afr right. any intake mod usually results in a slight loss of fuel economy, depending on how you drive.
wrexed03
12-11-2007, 01:38 PM
Let the ecu learn its new operating parameters.
Also recheck your installation.
Also get 02 sensor checked or replaced.
All else fails revise driving habits.
Regards
wastedhello
12-11-2007, 01:51 PM
well so far i haven't driven it past 3000rpm on this tank.
driven it easy as.
but 4L/100km so far is heaps.
I had the impression sticking a pod in was good for fuel economy.
I've got a small dent in the mesh for the airflow meter (see attached. with a pod where the airflow isn't straight could this small dent have much of an effect?
might try and get 80mm pipe. the 90mm pipe quite fit right.
mad082 magna
12-11-2007, 02:12 PM
it isn't just rpm that determines fuel economy. load does too. if you have been using more throttle percentage than normal but only going to 3000rpm you will still use more fuel.
Boozer
12-11-2007, 04:06 PM
CAI usually increases fuel consumption as well, as colder air is more dense, there will be more fuel mix to get to the right AFR
opilot87
12-11-2007, 04:35 PM
CAI usually increases fuel consumption as well, as colder air is more dense, there will be more fuel mix to get to the right AFR
Agreed, but only if your goign to use that extra power. Your not going to travel 10kmh faster just because your car is giving you more power. From the sound of it he hasnt been driving hard, and is driving the same as usual. Havign a CAI in these circumstances may have a slight reduction in fuel consumption because of the increased efficiency.
However I have heard POD filters can cause problems because of the way the airflows through the AFM or something, and it cannot read it accurately. Your increased fuel consumption may be caused by this or another independent problem.
Ollie
wrexed03
12-11-2007, 05:11 PM
Grab a screw driver take out the honeycomb mesh use an end of a paper clip and you should be able to get it back into shape. This is an easy fix. It may affect air fuel readings as it is in its damaged state. On a side note mine has been repaired multiple times after numerous lpg backfires lol. It looked like scrunched up bit of foil but i got it back into shape as best i could so yours is definetly salvageable.
Give it time your consumption may settle down.
Regards
wastedhello
12-11-2007, 08:05 PM
well I've straightened out the mesh already as best i can.
i will run this tank out and with the next tank i will see how it goes. if it's still a big problem then i might just go get a v8...
think my CAI piping my need replacing. might try something some 3" piping if my fuel problem persists. and if there is a leak somewhere then hmm. i dunno.
well i will post here in a week or so with the update.
thanks for the input
Trotty
12-11-2007, 08:13 PM
i heard that pods interfere with the way the AFM works, and can lean out a car?Or does it richen it up? i know it plays havoc.
wastedhello
12-11-2007, 08:47 PM
well heaps of people have them so unless they are all running with bad fuel economy there must be a way to fix it.
i was getting about 12.5L/100km now I'm on about 16L/100km
If your figures are based on info from trip computer remember to take it with reserve. There are many variables which will affect readings.
To get more accurate figures about fuel consumption fill the tank full and record kilometers from the odometer. Drive as usual and than when you need to fill again go to the same pump (if possible) fill the tank full and record kilometers from the odometer again.
Calculate how many km you traveled. Record how many liters you poured into tank (if not on the receipt) and then calculate average fuel consumption.
e.g. 42.71 liters of petrol , 376 km traveled. Divide 4271 with 376 and you get average fuel consumption of 11.35 l/100 km
There are still many variables but this is more accurate than what you read from trip computer.
If you find that your consumption is somehow higher than it was, try to go back to factory intake setting and calculate consumption with it. If consumption with factory setting is considerably lower that will exclude possible O2 sensor problem.
Dave262
13-11-2007, 05:55 PM
i heard that pods interfere with the way the AFM works, and can lean out a car?Or does it richen it up? i know it plays havoc.
Most the mitsu cars (if not all) use a vortex style air flow meter. You can't just stick a standard POD or air filter on them, as it stuffs up the air flow into the sensors and the whole vortex concept doesn't work properly. You need to get a filter designed specifically for the Magna that is in an oval shape.
hedgie
14-11-2007, 05:52 AM
i heard that pods interfere with the way the AFM works, and can lean out a car?Or does it richen it up? i know it plays havoc.
yeah i think that because its sucknig in the air through the pod and not flat panel it makes the flow heaps different( whirlpooling?) buggering up the afm and therefore has a lean out that is pretty bad isnt it? like dave said the whole vortex concept doesn't work properly
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