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lee16v · Posted: Thu Dec 11, 2008 12:14 pm Post subject: What a difference an AFM makes.

I've been tinkering even though I said in another post I couldn't be arsed in this cold bleak miserable weather Rolling Eyes

I fitted the second hand AFM I picked up a couple of weeks ago as part of a job lot and wow what a difference. The exhaust tone has gone from a fat warbling noise to a crisp raspy one, the emissions are far less rich smelling and after a spirited drive (glad to say the big ends are still ok) it generally picks up alot smoother. Well worth the numb fingers. Very Happy

bobbber · Posted: Thu Dec 11, 2008 2:47 pm Post subject:

Nice one mate Very Happy

I was looking into getting a prototype MAF from a bloke in Germany. Basically, he has a chip on it to successfully convert the signal from the MAF into it's equivilent AFM value for the MoTronic ECU. This has three added advantages (and possibly some more) :

1. More accurate air measurement from a MAF than AFM.
2. Less air resistance from the metal grill than from the traditional flap.
3. As the chip "converts" the signal, you can program the conversion with a PC, effectively allowing you to tune the fuel/air ratio.
Bob
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Fiat Bravo 165 Sport

BigAl · P4 Joined: 06 May 2003 Posts: 2995 Location: U.K Surrey

hey bobbber, how come you didnt mention that on the other post http://www.alfa-pages.co.uk/viewtopic.php?p=26267#26267
i would love to hear the induction noise from the throttle bodies

Lee don’t forget to recalibrate your different AFM to your ECU. What was wrong with the old one?? Was the air temp sensor dirty, seizing flap, adjusted spring?
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x2 33 16v
pictures http://www.alfa-pages.co.uk/viewtopic.php?t=5203

lee16v · Posted: Fri Dec 12, 2008 10:46 am Post subject:

Bob, That will be interesting, keep us informed.

Al, Not sure what was wrong with the old one. Because I now have all top end bits for the 16v I was starting to replace each bit at a time to see if the 'new' bits would make any difference to the running of the motor. As it was a direct replacement I didn't think any calibration would be needed. By calibration do you mean disconnecting of the ECU or some other technical fandangled operation I'm going to have to do?

johnboy · Posted: Fri Dec 12, 2008 4:33 pm Post subject:

hi chaps
thats interesting with maf! More power Wink

im very bored at work! Thank god for mobile internet Laughing

will be trying to fix the rear demister on the gtv tomorrow.should be fun!
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WODA WE NEED? MORE POWER!!

Alfa gt jtdm blackline
1990 S2 16v veloce sleeping!
2002 ts gtv the wifes now
1997 seadoo gsx 800
1999 freestyle superjet

BigAl · P4 Joined: 06 May 2003 Posts: 2995 Location: U.K Surrey

Hey lee,
If you change the afm or ecu, the afm needs to be adjusted to suit.
This is done by putting the gas analyser before the cat, if you have one and removing the lambda sensor, if you have one. On tick over adjusting the idle mixture screw clockwise for lean and anti-clockwise to richen up the mixture until you get the correct setting.
If the original afm had been done correctly, you could look at the output from pin 1 and adjust your replacement afm to the same voltage and then test with gas analyser. Have a look at my post on this.
http://www.alfa-pages.co.uk/viewtopic.php?t=5596
since doing this I have gone from 24 mpg to 31 mpg but I am running with no lambda correction as I think mine is knackered.
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x2 33 16v
pictures http://www.alfa-pages.co.uk/viewtopic.php?t=5203

BigAl · P4 Joined: 06 May 2003 Posts: 2995 Location: U.K Surrey

Was this it bobbber?
http://www.carlton24v.co.uk/afmmaf.htm
Looks like all the ones I have found are direct replacements for the AFM and non of them involve removing the plenum chamber.
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x2 33 16v
pictures http://www.alfa-pages.co.uk/viewtopic.php?t=5203

bobbber · Posted: Sat Dec 13, 2008 5:13 pm Post subject:

Not that one Al... but very similar

Bob
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Fiat Bravo 165 Sport