Stock ECU MAF replacement project

[Thuppu]

It costs 300$+ for that MAF.
Unless you want to buy it...

Honestly, I don't want to make experiments on customer cars.
You already have everything for the RS4 MAF, and that is tried and tested so that is what we will be going with.

Once I test the Pro-M on some cars and the MAF converter, then that is what I will be using, but it is really not my style to make experiments on 2000+ EUR engines of other people. I use what 100% works with a good result, as that is what is most important and most safe.

The R&D is done on shop cars in US, or on cars of close friends

I could have exchanged it to the RS4 MAF + €€€, but that is fully understandable that you don't yet want to go that route.

[prj]

One and a half years later it's finally done.

The first prototype. Need to flash the software onto it and see if it boots up, but so far all I/O has been good.

[prj]

Some more comments - it is the exact shape of the insides of a little box which it will be housed in.
The operational amplifier is located in a DIP socket and is user replaceable.
The amplifier is used mostly as input/output protection, so you can wire this up in every wrong way possible and the only thing that will die is the amp.
The amp can be easily removed with a small screwdriver and a replacement costs about 5€ shipped.

[Sir Buff]

Great! When can i order it? :-)

[Thecrispynoodle]

Just want to add how interesting reading this entire post has been (took me half an hour) and how grateful we should be to Prj and those working with him for doing such extensive R&D without intentions to make excessive profits from it. I'm interested in this kit over the next few months as have some erratic idling going on and a mixture adaptation code that won't go away so MAF is a possible culprit. Keep up the good work, we need you :-)

[prj]

Great! When can i order it? :-)

First it is going to the USA for calibration.
We are also going to try to prototype some 6-pin MAF plugs to make this plug and play, but no promises yet

When you can buy... expect early Q4 release I'd say.

[Thecrispynoodle]

MAF related question. Clearly the non RS2 screens restrict flow at higher RPMs, but do they also counteract turbulence across the MAF element (and thus 'smooth' the output signal) or create turbulence by way of being an obstruction? Basically are the screens there only to prevent damage to the element and the engine from foreign bodies which have somehow cleared the air filter or do they serve some other airflow smoothing purpose?

[driftin jo]

MAF related question. Clearly the non RS2 screens restrict flow at higher RPMs, but do they also counteract turbulence across the MAF element (and thus 'smooth' the output signal) or create turbulence by way of being an obstruction? Basically are the screens there only to prevent damage to the element and the engine from foreign bodies which have somehow cleared the air filter or do they serve some other airflow smoothing purpose?

They don't restrict flow, the sensor tops
Out at about 350 hp.

[EspenW]

They don't restrict flow, the sensor tops
Out at about 350 hp.

Umm.. they do, actually. Check out the classic and most excellent negative boost series that Julian Edgar over at Autospeed did back in the day:

http://autospeed.com/cms/article.html?&A=0652

Check the entire series of negative boost articles. Very interesting info about the almost non existent pressure drop over the filter, etc.

[Thecrispynoodle]

This report claims the screens do restrict flow. It's a good read. This is linked to inlet hose collapse on turbo upgrades also.http://autospeed.com/cms/title_Elimi...9/article.html

[Thecrispynoodle]

Ha - put my phone down for a while before replying. You got there first :-)

[prj]

MAF related question. Clearly the non RS2 screens restrict flow at higher RPMs, but do they also counteract turbulence across the MAF element (and thus 'smooth' the output signal) or create turbulence by way of being an obstruction? Basically are the screens there only to prevent damage to the element and the engine from foreign bodies which have somehow cleared the air filter or do they serve some other airflow smoothing purpose?

Common myth, the screen does not make any significant difference.
I have debunked that autospeed article time and time again.

The pressure drop they measure is 29.6 INCHES OF WATER at 7000 rpm with screens attached and 24.8 with them removed.
That's a difference of 4.8 inches of water or in other words 0.012 bar.

Yes, that's 0.01 bar difference between the screens on and off. Their change in power figures is just because the MAF read completely wrong and probably the ECU over advanced the timing.

So please, no more talk about these screens and this 0.01 uber difference in this thread.
There is no practical difference whatsoever between these MAF's. Hell, there is less than 0.1 bar pressure drop (0.07 bar) through the entire intake of these cars at 7000 RPM.
I'd say Audi has done a very good job designing the intake system.

[Thecrispynoodle]

Will move this to another thread, I understand why you want this one focused on the new MAF R&D.

[stocious]

Are these available to buy ?

[prj]

Soon... I did not have much time for it, but I am getting some help with it.
If all goes well, then they will be available in a few months.