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  1. #1
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    MAF Cleaning (used to be \"Technical Forum\")

    Is this forum missing?

    And who will be the first to post a question about cleaning MAF's or servicing dump valves? [img]/ubbthreads/images/graemlins/grin.gif[/img]

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  3. #2
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    Re: Technical Forum

    I think it would be good to have.

    AL

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    Re: Technical Forum

    I 'cleaned' my MAF the other day.

    Not a sausage, it was as clean as the driven snow.

    So now I have 900ml of Isoprop Alcohol left..... I wonder what it tastes like!

    -Dan

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    Re: Technical Forum

    Ok blonde moment.... MAF ???

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    Re: Technical Forum

    ...............Mass Air Flow (Sensor)

    It senses how much air is passing over it and then relays this information to the ECU so that fuel air mixture is regulated.

    Dirty MAF's cause turbo lag and general hesitation.

    .what an anorak I've become [img]/ubbthreads/images/graemlins/grin.gif[/img]

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    Re: Technical Forum

    Mass Air Flow sensor

    A hot wire sensor which monitors the flow of air past by means of the change in temperature the airflow causes (more air cools the hot wire more)

    This info is then passed to the ECU which controls the amount of fuel going into the cylinders accordingly.

    When they get dirty, they are effectivly insulated from the cold air breeze and hence think less air is going in, and therefore provide less fuel. This makes the car run lean, and hence run slower (which is bad!)

    I don't think it is such an issue on the newer cars (like your S3) but certainly on the older motronic S4 (pre 99.5) it was quite common.

    I think the newer MAFs (Mass Air Flow Sensors) are self cleaning, in a similar way to self cleaning ovens, they heat up so hot that they burn the dirt off.

    Hope this helps.
    -Dan

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    Re: Technical Forum

    [ QUOTE ]
    Ok blonde moment.... MAF ???

    [/ QUOTE ]

    Bet you're sorry you asked [img]/ubbthreads/images/graemlins/grin.gif[/img]

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    Re: Technical Forum

    No [img]/ubbthreads/images/graemlins/smile.gif[/img]

    So you reckon mine wouldn't need cleaning?

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    Re: Technical Forum

    I wouldn't have thought so.

    I mean mine was spotless and I have the older version.

    To be honest I can't really see how any dirt could get through the airfilter anyway (unless you are running a K&N or similar performance filter)

    I reckon most people who clean them are just seeing the dirt from that had collected on the top of the sensor (the bit that is exposed to the world under the bonnet.

    Although someone (I think it was Ian) said that they noticed an improvement after cleaning, so who knows?


  11. #10
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    Re: Technical Forum

    Well if you've got all that alcohol going spare, you can pop over and clean mine if you like [img]/ubbthreads/images/graemlins/wink.gif[/img] just round the corner!

    Cheers,

    Chris.

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    Re: Technical Forum

    Hope you don't mind - just changed the name of the thread as the subject changed.....

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    Re: Technical Forum

    MAP is Manifold Air Pressure, slightly different to a MAF
    most of you don't have MAF's!

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    Re: Technical Forum

    Who does have a MAF then?

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    Re: Technical Forum

    I do....

    Or at least I hope so... Feck knows what I cleaned if I don't have one!

    I think all 2.7Ts have one (S4, RS4, Allroad turbo & A6)

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    Re: Technical Forum

    anyone got a Halve Actuated Independent Recycling Yaw MAF? [img]/ubbthreads/images/graemlins/blush.gif[/img]

    IMHO its a waste of good alcohol, and time and effort cleaning your MAF, anyone disagree?

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    Re: Technical Forum

    [ QUOTE ]
    I do....

    Or at least I hope so... Feck knows what I cleaned if I don't have one!

    I think all 2.7Ts have one (S4, RS4, Allroad turbo & A6)

    [/ QUOTE ]
    you probably cleaned the MAP lol [img]/ubbthreads/images/graemlins/laugh.gif[/img]

  18. #17
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    Re: Technical Forum

    [ QUOTE ]
    anyone got a Halve Actuated Independent Recycling Yaw MAF? [img]/ubbthreads/images/graemlins/blush.gif[/img]

    IMHO its a waste of good alcohol, and time and effort cleaning your MAF, anyone disagree?

    [/ QUOTE ]

    Well, to be honest, the first time I cleaned my MA(F)(P) [img]/ubbthreads/images/graemlins/tongue.gif[/img]
    it was dirty enough to have a visible effect on the alcohol [img]/ubbthreads/images/graemlins/frown.gif[/img] I've cleaned it about 3X since putting in my K&N panel, and it's been fairly clean each subsequent time.

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    Re: Technical Forum

    I think if you're using an oil based fiter like a K&N then there is a requirement to clean the MAF from time to time. The standard cardbourd Audi air filer does not necessitate MAF cleaning.

    Anyone agree?

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    Re: Technical Forum

    I agree.

  21. #20
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    Re: Technical Forum

    I second, your agreement [img]/ubbthreads/images/graemlins/tongue.gif[/img]

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    Re: Technical Forum

    Agreed. i just run a std paper filter cos of that

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    Re: Technical Forum

    Rich,

    Me to. K&N panel is sat in a cupboard somewhere. Can anyone think of some alternative uses for it? [img]/ubbthreads/images/graemlins/smile.gif[/img]

    AL

  24. #23
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    Re: Technical Forum

    [ QUOTE ]
    Rich,

    Me to. K&N panel is sat in a cupboard somewhere. Can anyone think of some alternative uses for it? [img]/ubbthreads/images/graemlins/smile.gif[/img]

    AL

    [/ QUOTE ]

    That answers my question of, are K&N's worth putting in an S3 [img]/ubbthreads/images/graemlins/wink.gif[/img]

    Jon.

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    Re: Technical Forum

    Well I'm using a K&N filter because it is claimed to increase airflow and horsepower. Am I right in thinking that these claims are not justified?

    Have their been any independent tests apart from the one referred to by K&N?

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    Re: Technical Forum

    Joshie,

    I don't think it would make too much difference on a standard car like mine.

    ....but then yours is far from standard!! [img]/ubbthreads/images/graemlins/grin.gif[/img]

    I'd would have thought the standard audi airbox and filter combo were designed with 265bhp in mind, perhaps you could stratch this a bit, but 400hp's worth of air will surely struggle to get through!

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    Re: Technical Forum

    Well K&N make some ambitious claims about BHP increases on their packaging.

    When I had my car dynod at AMD before the mods and running the Abt 310HP chip, a Milltek Cat-back and the APR bi-pipe (as well as the K&N) I was getting 316BHP. The standard ECU produced 272. So that is an increase of 44 BHP for the Abt chip.

    Given the Abt's ECU produces 309BHP, this leaves 7HP for all the other mods so possibly the K&N claims are a bit over the top.

    The only way to test this would be to put the car on the dyno and run it with or without the K&N and see if there is a difference. The only problem with this suggestion is that the dyno plot is not consistent - so many things to affect the final result.

  28. #27
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    Re: Technical Forum

    Well, I have had a K&N in my A3 for a bit over a year now, with no problems. While I can't prove any performance increase, I have noticed an improved throttle response, nut the main reason I've kept it, it's reusable [img]/ubbthreads/images/graemlins/smirk.gif[/img]

  29. #28
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    Re: Technical Forum

    True, but the A3 i.8T doesn't have a MAF so you wouldn't have the oil and worries.

    I think the 1.8T engines have a pressure sensor, not air mass.

  30. #29
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    Re: Technical Forum

    Actually, I DO have a MAF, or MAP or whatever [img]/ubbthreads/images/graemlins/crazy.gif[/img] Same part (at least externally) as the S3 [img]/ubbthreads/images/graemlins/tongue.gif[/img]

  31. #30
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    Re: Technical Forum

    [ QUOTE ]
    Well, I have had a K&N in my A3 for a bit over a year now, with no problems. While I can't prove any performance increase, I have noticed an improved throttle response, nut the main reason I've kept it, it's reusable [img]/ubbthreads/images/graemlins/smirk.gif[/img]

    [/ QUOTE ]

    Another TFB [img]/ubbthreads/images/graemlins/grin.gif[/img]

    What do you do, wash it in warm soapy water and then apply axle grease [img]/ubbthreads/images/graemlins/laugh.gif[/img]

    Seriously though - how is it serviced?

  32. #31
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    Re: Technical Forum

    Dan,

    Yeah I can confirm Drill's response. Mine (MAF/MAP) got knackered on my A3 1.8T.

    AL

  33. #32
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    Re: Technical Forum

    Joshie,
    Actually, K&N have a "Recharger Kit" to clean the filter, it contains cleaner, which you spray on (or soak) the filter with, then you let it dry, and spray on the K&N oil. That's it [img]/ubbthreads/images/graemlins/smirk.gif[/img] The only problem with the 1.8T's is if you put too much oil on, you can easily coat your MAF with excess oil, thereby giving it hell. What I do, of course I've only recharged mine 2X now, but I make sure I keep the oil light, and if I do overspray a bit, I blot it with a towel, and pay a bit closer attention to my MAF.

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    Re: MAF Cleaning (used to be \"Technical Forum\")

    Booked the car in for a service and had a chat with the dealer about MAF's, basically he said unless you were running an aftermarket filter or driving in seriously dusty condtions there is NO point in this.

  35. #34
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    Re: Technical Forum

    So what type of sensor would a 1998 1.8T (a3) have?

    Rich B

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    Re: Technical Forum

    [ QUOTE ]
    RichA3Turbo said:
    So what type of sensor would a 1998 1.8T (a3) have?


    [/ QUOTE ]

    Both. MAF is used for fuelling, MAP is used for boost control.

 

 

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