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Go Back   TDIClub Forums > VW TDI Discussion Areas > TDI Power Enhancements

TDI Power Enhancements Discussions about increasing the power of your TDI engine. i.e. chips, injectors, powerboxes, clutches, etc. Handling, suspensions, wheels, type discussion should be put into the "Upgrades (non TDI Engine related)" forum. Non TDI vehicle related postings will be moved or removed. Please note the Performance Disclaimer.

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Old September 8th, 2009, 19:23   #1
kooyajerms
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Default a4 maf conversion on mk3 (b4)

Can anyone post the how-to? I'd ask Jeff but I don't have his number =)

is it as simple as a pin change and fitting it to the b4 box? Anyone know if it will bolt in the same way, or do I need to go fully custom?



a4

b4

change the pins?


Best I could find was this thread but it never got resolved
http://forums.tdiclub.com/showthread...hlight=mk4+maf

bam bam dip's maf thread
http://forums.tdiclub.com/showthread...&highlight=maf

Last edited by kooyajerms; September 8th, 2009 at 19:26.
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Old September 8th, 2009, 23:39   #2
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Why do you want to change it?

Johan
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Old September 9th, 2009, 00:09   #3
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My question as well
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Old September 9th, 2009, 07:24   #4
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It got mentioned here... I know my maf's more reliable, are Chris and Peter talking hogwash!??!


http://forums.tdiclub.com/showthread.php?t=257753
post 11 and 12

Quote:
Originally Posted by mrchill
Indeed! The Mk4 MAF allows finer fuel control and less smoke. The connectors are different, but Jeff can give you a diagram to swap them. B the way, my car can get(has gotten) 55 mpg with this setup.
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Old September 9th, 2009, 07:30   #5
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It seems to be a requirement when going VNT on a A3/B4. Maybe not but people always seem to use the MK4 MAF at the same time.
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Old September 9th, 2009, 10:37   #7
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Its not a requirement for sure....

What I want to know is why would it make a difference, what advantage would it present in terms of performance.


Quote:
Originally Posted by Spulen81
It seems to be a requirement when going VNT on a A3/B4. Maybe not but people always seem to use the MK4 MAF at the same time.
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Old September 9th, 2009, 11:12   #8
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Cant the MK4 MAF "read" more airflow in the case of a bigger turbo that will be pulling more air.

This is the main reason for the upgrade, no?

Id say the mk3 pierburg is more reliable btw, 10 to 1 in my experience.
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Old September 9th, 2009, 15:41   #9
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I didn't do the conversion but my A3/mk3 is running a A4/mk4 pd150 unit wastegate setup.
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Old September 9th, 2009, 17:34   #10
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Quote:
Originally Posted by kooyajerms

b4
NOT! Oh, the MAF is the same as on the B4, but that's an A3 in the image.
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Old September 9th, 2009, 22:20   #11
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The Mk4 reads more and thus reports more info. This translates into better tuning ability, less smoke, more power, better mileage. The older sensors were in fact more reliable, though they saturate at about 800 to the 1250 of the Mk4. In this case, more is better.
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Old September 9th, 2009, 23:43   #12
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data logging maf has shown in the 1100s with the afn software is this a false reading

Quote:
Originally Posted by mrchill
The Mk4 reads more and thus reports more info. This translates into better tuning ability, less smoke, more power, better mileage. The older sensors were in fact more reliable, though they saturate at about 800 to the 1250 of the Mk4. In this case, more is better.
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Old September 10th, 2009, 00:28   #13
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Later Mk3/Early Mk4 with Pierburg can also show 1275mg/stroke instead of 850. It`s in the software. You can use bosch maf with a software update or a converter. Look at http://www.geocities.com/tech4tdi

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Old September 10th, 2009, 04:09   #14
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Please don't change your A3 maf to A4 without changing your computer firmware. In a nutshell, some audi's ran an a4 maf in their AFN110, but the cruise was wired different and requires reassigning pins with this firmware.

I have run all the different AFN110 68 pin (vnt) firmware's, and the one with the A4 maf had the best throttle response at part throttle, but they all give same max power.

Maf calibration is simple and reporting more air is not a mod. hehe.

Don't ask how to do this unless you are willing to convert your WG turbo to VNT! These improvements all led engineers to develop the mk4. Then they discovered it would benefit to be able to control each individual injector event (timing) independant of each other, and the PD was born. Next they discovered multiple injection events for each stroke was cool too, hence the CR was born, whats next? High rpm diesels w/compound turbos!

Jeff ;-)
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Old September 10th, 2009, 08:50   #15
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Quote:
Originally Posted by Lug_Nut
NOT! Oh, the MAF is the same as on the B4, but that's an A3 in the image.
There goes Jon not missing a beat.




Jeff, the reason for the change is the move to the gta2056v so yes I will be moving to a VNT. Care to send me a text or elaborate? Thanks.
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