One of the biggest restrictions in the intake system on a mk3 GT or NZ apart from the airbox is the Airflow meter as its only got a tiny bore. I think the ones that fit from a Golf are from the Digifant powered mk2's, and you can often find them on ebay (I've got 2 off there for less than £15 inc. postage).

They are plug and play with bit of setting up, but they wont fit the standard airbox, so you'll probably need to get an induction kit, and as you wont need the warm air feed in future, you can remove the air temp switch from the throttlebody elbow, as it is just another restriction to airflow

here it is in place



and here it is removed



now you need to fill the holes up, for the past year I've just used so insulation tape and its still going strong.

so the next thing to do is to remove the black top off the Airflow meters, so you can see the tensioning spring and wiper arm that tells the ecu whats happening. the top can be prised off with a screwdriver.



next you need a manometer its basically a u shaped peice of tubing with water in it, so you can measure the pressure of the flap in the AFM. I used airline for fishtanks, some cable clips and a peice of wood to make mine.



so now you can begin to change the AFM:-

1) with the standard GT setup and manometer connected to one of the holes in the throttlebody elbow warm the engine up. (cover the other hole up with tape, and the other end of the manometer should be left open).

2) when the engine is warm, make a note of the water level in the manometer and the position of the wiper arm in the AFM, then stop the engine.

3) unplug the lambda probe, so that the ecu is using the AFM to set the idle mixture

4) remove the GT AFM for the tube that connects it to the throttlebody elbow and force it over the Golf AFM (its a bit fiddly but it will go) and remove the rubber bung from the CO adjustment screw on the Golf AFM (its by the rubber connecting pipe) and also plug the golf AFM into the connecter that was on the GT AFM

5) restart the engine, with the golf AFM, and its will probably be coughing and spluttering, so to keep it running move the wiper arm in the AFM to where it was when you had the GT AFM connected

6) with an Allen key in the CO adjusting screw, turn it so that the wiper arm goes to that position automatically (the CO adjusting screw is an air bleed screw that allows the air to bypass the flap that offerates the AFM)

7) next adjust the spring tension that operates the flap, by undoing the screw and moving the geared wheel until the water level in the manometer is the same as when the GT afm was connected

8) do no.6 again for final adjustment

9) thats it done, just reconnect the lambda, disconnect the manometer and seal the holes up in the throttlebody elbow.

you may find that it needs a slight adjustment later, but that should be near enough spot on.

do u wanna do it for me lol?!!

the temp switch is already removed

you should set up a service doing this....i would pay lol

seems like yolmol wants it done as well

any gt pro's wanna offer this service for a bit of ££?
is this the required part?
http://cgi.ebay.co.uk/mk1-golf-gti-afm-mas...1QQcmdZViewItem

Err, no it isn't. This is tho...

http://cgi.ebay.co.uk/VW-Golf-MK2-1-8-8V-D...1QQcmdZViewItem

cheers

Soooooooo....who's fitted one (to what spec car) and what difference has it made to performance?

Better acceleration

Dom set mine up and it takes a while to do it cos you have to drive it for a couple of days and tinker with it before it is right

Well worth it though

I'm looking to do this mod on my GT and I want to know what bits to purchase.

From your description Dom it looks like the air flow meter is that tiny little pink and black part with the metal clip. Am I right in saying this?

I typed air flow meter in on eBay and got this:



I'm a bit confused to be honest and that's just buying the bits! God knows what's going to happen when I try to set it up. If someone could post up what car it needs to be from 16v/8v? a picture and/or a part number it would help loads.

that pic is indeed an air flow meter. The pink thing in the first couple of pics is a temperature switch.


Its from an 8v that you need it. Theres a few engine choices but most late 80s early 90s vws with a 1.8 or 2.0 8V GTI engine have one that can be used.

Thanks for that Gaz

I have just tackled the mod and am pleased with the result. Seems to rev more freely! Worth the £10 for the part (OK I splashed out £70 for a K&N filter also but you don't have to!)

so would thie unit be a direct replacement for this unit and also a bit of setting up?:



the pic is from this ebay ad: http://cgi.ebay.co.uk/VW-Golf-GTi-Mk2-AIR-...bayphotohosting

If you are asking whether or not that's the right part then yes it is.

And yes it will need setting up as optima21 has described above!

Nice how-to but one extra point....

make sure idle speed is the same when doing the manometer readings. Pressure varies greatly around idle so make sure you adjust idle speed to spec before you do the change and then once you have adjusted the flap...


Oh and the hose is a BLOODY TIGHT FIT!

Steve

i would like to fit a golf afm... i bought a GT engine BUT!! ..... i didn't get a air flow with it ... so I'm going to find it difficult to adjust?....
so what do i do ?!
can you help.. e.g turn co screw in by one full turn or so ..

no mate you need the gt airbox to get the reading off!!!!...so you idealy need to use a friends or something...

just had a thought...surely someone eg; optima [in the know] could set up a few of these on his so they run prettymuch right and sell them on at a proffit....id be interested??!!!!!!!!!!

i think that the afm setup would vary from car to car, ideally as they're mostly the same engine on paper it sounds easy but each engine may require different levels of setting up...

does anyone have a part number for the mk2 AFM. there is currently 2 mk2 GTi's in a local scrapyard and was thinking of getting the AFM off it for my polo GT... just want to make sure i get the right part

quick question, it may be a silly question, but-

can the mk2 golf gti 8v airbox be fabricated to fit in the mk3 polo engine bay to retain the oem look?

I think theres a great possibility it would be too tall to fit in the engine bay with the bonnet closed. By comparison the NZ/GT/G40 airboxes are quite shallow.

Karl.

can you use a early mk3 2.0 gti afm and airbox?just wondering as i have a kn panel filter for one and would be a right result if i could

The Mk 3 Gti's use a air mass sensor which is different to the air flow meter used in the Mk2 Gti digifant.

The Mk2 Golf digifant airbox is at least twice as deep and much bigger width and depth compared to the Mk 3 GT airbox. It would not fit.

ok,thanks

Is it ok to set one of these up if you taking the original readings from a gt afm with a cone filter attached?

got another question

the adaptor plate that yu need to put afilter on it... can this be made of plastic or is there a chance it would melt?!

silly question as it only air flowing through it so in theory it shouldnt heat up but just to be on the safe side...

couple more questions..

i have now fitted the AFM and a K&N but struggled through some of the process.... the car starts pefectly and idles fine and doesnt splutter when accelerating so i assume its fine but just to be sure

on the throttlebody elbow there was 2 white air leads... should i have removed one of them as it wasnt needed?

what do yu do with the pipe that sticks out of the throttle body elbow where the air lead went on to (assuming yu were supposed to remove it)?

i didnt remove the lambda probe... will this effect how it has turned out?

if i think of anymore i will remember to ask if anyone can shed some light on these questions please answer i dont want to be driving about and it go tits up

Hi, was thinking of fitting one to my 91 gt coupe. had a look on ebay and this was all i could find. Could you tell me if this is the right part please. And I see that most people that have tried it rate it and i understand that this is probably getting repetitive, but will i notice the difference? Sorry I'm new to this and just trying to learn as much as i can. Any help would be greatly appreciated thanks.

Whoops forgot this.
http://cgi.ebay.co.uk/AIR-FLOW-METER-CHIPP...1QQcmdZViewItem

thats is some pikey resistor ^^^

buy a real unmodified AFM.



I am goign to be setting mine up using a gas analyzer

I have been told to aim for a air/fuel ratio of 14.7

Is that the only figure I need to know?

well thats meant to be the most economic and so on.... I'm sure of the rally air to fuel mixture was different.
there are guages that tell you for different things...

i would like to know more myself, i would also like to know how the hell to set it using a gas analyzer?

Is there a quick way to do this?? Like a stndard position for everything? I've heard the CO screw should be turned allthe way in then turned put 1 and a half back out.. what about the black thing in the AFM?

Help. As koosh said what happens with the white leads that connect to the temp switch??

hey mate... just pull out all the temp switch and remove the white lines. find where the other ends connects to and remove them too.. i think one goes into a T-piece so just get rid of the t piece and hook it all up.... pretty sure thats how it goes mate any help get back

cheers mate, done that and its working dandy

optima21 hope you don't mind me doing this but I have done a quick guide to removing the temp switch.

As stated you have this in your elbow.



Using a pair of pliers pull the metal plate upwards to release the switch from inside the elbow, which consist of this.



This leaves you with two holes.



There are a million ways to blank the holes, I used this stuff mainly because I had it left over from dewedging my throttle body but it is the best solution for things like this
It will cost you about £5 from a good motorfactors. Its the same sort of form as Blue tack but when you knead it together a chemical reaction happens & it starts to go rock hard! Its consistency makes it easy to cover the holes as it sticks easily.



Before I applied it I gave the holes & the area a quick sand to key it slightly, didn't bother with the inside. I then applied it to the top & did the inside too.



This is the inside, its actually much flatter then what it looks there due to the scale.



Left it for an hour to set.



Job done - If you are going for the OEM look you can sand this stuff flat but I'm hung over so will leave it at that.

Obviously this mod is easy to do & doesn't really need a guide but might make people a bit more aware that its worth doing!

Ash.

Be very carefull with the spring adjusting screw as mine just snaped.

I'm going to try and set mine up by just using my CO2 unit over the weekend. Going to try a few spring positions to compare.

I roughly set mine up the otherday and I have just done final tweeks with a CO2 meter.

Here's how to do it basicaaly following the guide but with a few minor changes.

Take the readings with the manometer and position of the arm on the afm as described for your std setup.

Turn the car off

Leave the manometer connected and swap to the Golf setup unpluging the Lamda next to the intake elbow.

Now with the top off the new afm pull the spring back with your fingernail and move the cog anti clockwise until the arm starts to move rownd on its own and is not at the beginging anymore. As in the pic below and release the spring.




Now pulling the spring out each time and move the cog clockwise one tooth at a time until the arm just touches the beginning on its own. Move the spring 5 more teeth and thats where mine is.

Next wind the CO2 screw all the way in and then back out 4.5 turns.

Thats it. Start the car ad see how it runs. Should be as described in the guide biut if not tweek it as instructed.
Moving the cog clockwise makes the manometer higher and visa versa. I found when I moved it clockwise i needed to turn the fuel up.

Hope this helps.

just set mine up at that it was running very uneven before spot on now runs sweet as

can anyone help me out cause reading all this is messing my eyes up lol.
thanks ben

please!!!!!!!!!!!!!!!

which bits in the afm are the wiper arm and tensioner thingemy? and where do you plug the manometer into? any chance of some pointers on the pics??
this is seeeming far too complicated for the benefits!

hi i really want to put the golf afm on my gt but looks hard to do !! so does any one no where i could take it to gert it setup ?? please help

I've used an airflow meter off a vauxhall frontera

hi need to no if the Air Flow Meter from a 1995 MK3 Golf GTi 8v can this be used ? thanks ben

fitted a mk2 gti afm today took 2 mins and runs fine didnt use a manometer all i did is unscrewed the screw that holds the tensioning spring and wiper on and moved it with out taking it off to where the gt one sat job done !

can some one tell me where the co2 screw is on the golf afm please