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High Fuel Conumption: Something Wrong Here??


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#46 mk6 fiesta owner

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Posted 13 June 2012 - 10:52 AM

hi lloyd i done mine today the front part its made sound little better but my engine did sound meaty anyway being the 1.6 16v ill also do the baff soon and see how that makes it :) but do post pics after as i would like to see thanks m8

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#47 jnb1

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Posted 13 June 2012 - 03:22 PM

Just finishing de-snorkaling and de-baffling my airbox today. Took her out for a run, and noticed the the idles revs were a tad higher once the engine had warmed up. However, after returning back home, and letting her rest whilst ticking over, it seems that the ECU has now adjusted to the increased flow of air.

In regards to removing the baffle, has anyone noticed any performance losses/gains? I heard somewhere that removing the baffle causes a loss of air pressure therefore reducing overal torque. Can anyone elaborate on this? I don't see how removing the snorkal and/or baffle would have a massive negative affect on performance.

#48 jnb1

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Posted 13 June 2012 - 08:49 PM

So can anyone shine some light on de-baffling and performance?

#49 Louis Davey

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Posted 14 June 2012 - 09:57 PM

What on earth are you all cutting up your car for lol....... you do know to get affect you are after you have to work two parts so if you have more air flow you need a good cat back exhaust with maybe a sports cat also. your moaning about fuel adding more power will burn more fuel. you have a 1.4 its going to be slow as, live with it or buy a faster car, i have a mk7 1.4 titanium and its also slow as and poor with the engine not being very revvy just live with it and stop chopping up your car!

Edited by iNath, 14 June 2012 - 10:21 PM.
Removed swearing


#50 Lloyday

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Posted 14 June 2012 - 11:14 PM

Principle of mass air flow does not rely on the velocity of the air simply the Volume per second. By removing the baffles your adding more air into the airbox, basically turning your stock intake system into an induction kit, spoke to the ex mechanic in my lift share to work today, said it will give a beefier edge to your power and better your fuel economy because the air is in mass and is a purer form. Also another thing he said to do was to block off the EGR valve on the exhaust manifold. Yeah It will need a drive round to adjust, probably about 10 - 20 miles should do it. enough for the ECU to adjust properly, pictures up sunday.

@louis. No point getting a catback exhaust system as the engine won't be pushing the gasses out fast enough to make the difference, best thing to do rather than spend £60-£100 is just remove the mid box and replace it with a pipe.

#51 Lloyday

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Posted 14 June 2012 - 11:19 PM

Per example of my statement, I work on 747 Jumbo's and the engine rely on mass air flow. Even though the aircraft is travelling at a speed of 0.86 mach the airspeed at the fan blades is only 0.4 mach (divergent ducts etc.), the point is that the engine uses that large surface area to burn as much fuel/air mixture as it can per any given moment of time, So velocity is disregarded as it relies on time. Even this 80% of the engines power comes from the Cold by pass air meeting the Hot exhaust gasses, to replicate this, you can add a styling tip as it will partially turn your exhaust into a bypass engine as the cold passing air goes through the gaps in the styling tip then meets the hot exhaust gasses. Surrounding air does the same but not as concentrated. Not sure about that though

#52 Dave-2912

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Posted 15 June 2012 - 09:22 AM

In regards to removing the baffle, has anyone noticed any performance losses/gains? I heard somewhere that removing the baffle causes a loss of air pressure therefore reducing overal torque. Can anyone elaborate on this? I don't see how removing the snorkal and/or baffle would have a massive negative affect on performance.



I haven’t really read the whole of this thread so apologies if this doesn’t make sense but smooth airflow into the engine is important. The parts you're talking about could have helped with smoothing so removing them could make the air entering the engine more turbulent. This means you might not reliably get the same amount of air into the engine cylinders each time as the flow of air isn't at a constant rate. This would have a negative effect on engine power. Just a guess but maybe that’s what your sources are referring to.



Hehe! No problem Matty, looks like a trend is starting. I personally have removed the snorkel (the bit at the front by the grill), and (will be) removing the baffle (the bit in the airbox) tomorrow morning. This gives you a nice engine roar without damaging performance. It actually makes your throttle response crisper. I'm also dropping in a BMC filter tomorrow, and adding some pumaspeed cams, which should sweeten the deal

I did thanks Jamie! Sent you a reply



Good idea! Actually, Pembrokeshire is west Alot of zetec's round here! Before we have a meet, I'm going to put some proper alloy's on, as I can't turn up with the stock Ford alloy's, I'll get laughed out! . Not so keen on adding an exhaust tbh, as I can't be asked paying the slightly increased insurance premium!



On another note, I hope insurance companies have been and will be made aware of the induction modifications, aftermarket cams and non-standard wheels that have been discussed here...

#53 jnb1

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Posted 15 June 2012 - 10:35 AM

@ Louis: I understand your point, and have since replaced the baffle in my airbox, as the car performed better as it was. You would be surprised though, the 1.4 isn't that slow, gave my mates Audi A3 a run for its money. But I am taking your advice, and part exchanging my zetec for a 1.8 VVTi Celica next year.

@Dave: Of course my insurance will be informed, although the new alloys and cams haven't been installed yet. Not sure if I should install them, or keep the wheels for my celica next year.

@Lloyd: I can imagine blocking off the EGR valve would lead to quite a few MAF/emissions issues. Not sure I want to venture down this route. I have now come to the conclusion: Why spend loads of money modifying your car, when you can save that money, and use it to buy a faster car next year. However, drop in a BMC filter if you must though, I love not having to drop down to 3rd from 5th to overtake, the torque is lovely :)

#54 Louis Davey

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Posted 15 June 2012 - 02:57 PM

i know each to there own but i wish to god i didnt buy the car lol FAMILY is the only reason :( i watched some videos of my self in old cars and im going back to old e36s.


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