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Old 03-18-2004, 10:33 AM   #1
6piston
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Done! AFM to MAF. Awesome!

Hi guys,

I finally did my AFM to MAF Conversion

I love it so so much. The response is just fanstastic. no more stupid AFM flap to restrict the flow, most people who are like me would know that the revs will drop below idle sometime if we quickly depress and press the accellerator pedal. it's gone now

and the air flow is just awesome. you have to feel it to believe it man.

ok, let's talk about how it's done,
i bought a 1998 E39 525i Siemens MAF, an aluminium connector hose, a silicon connector, and a 3" inlet Pipercross air filter

You need some sort of a chip or A/F device to tune the ECU to recognize the new air flow device.

In this case, the Unichip and Unichip tecnician did all the signal adjustments, conversion and a/f settings.

The plug to to the MAF will tap the ones from the former AFM and modified slightly. Air Temperature sensor isn't use in my application. instead, the ohms of a wire were changed to "cheat" the ECU of the air Temp sensor being there and there's only 1 reading which is a permanent reading that will never change according to temperature. Plus the air Temperature in Asia don't vary much, so i'm not worried about it.
it's quite techincal which i ddin't really get to absorb much.

anyway, i gained 5RWHP on top of the 160RWHP i had before MAF which was pretty good. but what's important was the engine response that i'm really happy with. No graphs and charts due to the faulty printer..

but there are pics. so enjoy!




















cheers
Tom
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Old 03-18-2004, 10:39 AM   #2
6piston
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i would also like to say thanks to jimmyd1 for the info given.
but somehow, the wire's colour were different and the description were vague.

http://www.maxbimmer.com/forums/show...threadid=26646

but thanks anyway
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Old 03-18-2004, 12:36 PM   #3
Bob Loblaw
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Cool stuff. And those headers pics are amazing!
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Old 03-20-2004, 01:56 PM   #4
snd84318i
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i have an 84 318i cant i just delete the flap or cut it in ave to for continuous air flow?
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Old 03-20-2004, 03:23 PM   #5
felixthecat
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Quote:
Originally posted by snd84318i
i have an 84 318i cant i just delete the flap or cut it in ave to for continuous air flow?
no you cant...the car will idle thats it,as soon as you push the gas it falls on its face(trust me as soon as i bought the car,thats the first power robber i looked at fixing)ive heard that the newer vw pieces can be used for the swap.....the kit from bmp is some ridiculess price so thats noot gonna be the way....i'll be doin one soon,as soon as i figure it out,i'll post pics and info for all who are interested in this swap...
look for it in the spring..
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Old 03-20-2004, 03:28 PM   #6
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id say your air/fuel ratio is just a bit *pinches his fingers together*off man...those shouldn't be red like that...if thats how hot it gets in the headers,think how hot the exhaust way is...not good for a motor man....im thinkin that maf conversion isn't sorted out yet...id bet that your running way too lean at high rmp's...better check that out

Last edited by felixthecat; 03-20-2004 at 03:58 PM.
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Old 03-20-2004, 04:12 PM   #7
BladeRunner
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6piston car looks nice
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Old 03-20-2004, 04:45 PM   #8
6piston
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Quote:
Originally posted by felixthecat
id say your air/fuel ratio is just a bit *pinches his fingers together*off man...those shouldn't be red like that...if thats how hot it gets in the headers,think how hot the exhaust way is...not good for a motor man....im thinkin that maf conversion isn't sorted out yet...id bet that your running way too lean at high rmp's...better check that out
hi felix.
in fact most cars' headers will glow if you contrinuosly ramming it.
they glowed when i had my stock headers, my E35 520i glows.

it's not the a/f. if you richen it, it'll still glow, cos that's just how hot the exhaust it.

cheers
Tom
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