RS4 MAF Modification

[Rusty]

What is the theoretical limit of the 78mm ID housing?

[prj]

No idea.
Depends on sensor too.

Pro-M sensor can do 2700 kg/hr in a 3" tube for example.

And what's the point when the chinese housing costs 20 EUR?
Sorry, I am just not seeing it atm.

[Rusty]

One point, raised above, is that anyone running over RS2 spec will need to modify their RS2 air box to fit the RS4 MAF, which more than likely cost £250-300 to buy as part of a project. Why not design it to include those running 3071 or a hoffer k26/27 with an air box?

[Sonic]

I am, well, should be running K26/27 from hoffer with RS2 airbox (unmodified). So is Ross.

[prj]

One point is that anyone running over RS2 spec will need to modify their RS2 air box, which more than likely cost £250-300 to buy as part of a project. Why not design it to include those running 3071 or a hoffer k27 with an air box?

You can do whatever you want. You can make up and sell those housings.
I can map cars on them, that's fine.

I have a ready part for 20 EUR. You are saying "hey mate, why don't you get a part for 100 EUR and then include a few cars, which you can already include by just mapping 50hp to the last cell, and everyone else needs a different solution anyway.
And while you're at it, you can make two versions of your converter, and spend double the time on a flow bench and in R&D, and maybe not ever get it to work properly, because you are using a MAF in a custom housing".

Sorry, but you are not convincing me.
If you want to make up a housing for Ross or Andy, and they are willing to pay extra for it over the china 20 EUR part, then go for it.
I am not fitting a converter on their cars anyway, since it's not ready yet, and I have to modify the ECU's, and do all of that, so it's custom anyway.

But for a mass replacement project, I need to drive the cost down enough, so people would buy it over a standard MAF. And a 100 EUR billet housing is not helping that!

[Rusty]

But to fit an RS4 MAF, required for your setup, you'll have to modify it, as per the pictures.

[prj]

Yeah, you do, but I am looking to phase out RS4 MAF's altogether.

I want to have two solutions:
a) 80mm MAF bolt-on with converter, no ECU mods, up to 450hp (50 hp blind).
b) Pro-M MAF for 400 to 800hp on pressure side and ECU mods.

Right now I have only the solution to use the RS4 MAF.

If you want to make a couple custom housings for the RS4 element until I have a) and b) ready, then go for it.
Make them, stick the sensors in, sell them to Ross and Andy and I'll do my very best to get those cars running. However, if there are problems because of sensor positioning or turbulence with those housings, then I am not responsible.

I know for a fact those 20 EUR bits will work perfectly, since they are exact copies of Bosch designs.

[prj]

I guess my point is, I don't like to experiment on customer cars.

[twoqu]

I think there is a little confusion over the RS4 MAF! As I understand it, basically whats proposed is the dimensional similiar Alfa MAF housing fitted with the RS4 airflow sensor part. Not a whole actual RS4 MAF.
The housing is available cheaply thanks to our Chinese friends. The essential sensor used would be the genuine Bosch due to the more exacting standards in its manufacture.

[prj]

I think there is a little confusion over the RS4 MAF! As I understand it, basically whats proposed is the dimensional similiar Alfa MAF housing fitted with the RS4 airflow sensor part. Not a whole actual RS4 MAF.
The housing is available cheaply thanks to our Chinese friends. The essential sensor used would be the genuine Bosch due to the more exacting standards in its manufacture.

That's what I suggested.
It'll max out at 400hp though.

For 450+ hp cars I have recommended to fit the whole RS4 MAF, the whole big lump.

[twoqu]

At the end of the day I guess you must decide what power level you want and source and incorporate the necessary components into your build. If you want a stock looking engine bay with airbox and factory/Samco hoses and resaonable power level (400bhp) then the hybrid maf sounds ideal. Especailly when you consider the availability/cost of the stock one and the known problems associated with it.
Once the housing is accquired, whether new or used, then the replacement element is considerably cheaper to replace should something happen. Presumably the actual sensor is more durable in the first place.

[Ross]

I guess I'm a bit of a perfectionist and this puts me a dilemma.. 'perfection' in terms of the MAF not being blind for the last 50hp, of 'perfection' in terms of stock fitment?

Honestly - I do like to experiment, which is why I am always keen to do something a bit different, and I'm happy to pay a bit extra and have a little more risk.

However, I must say I'm perfectly happy with the remap as it is now with the last 50hp 'blind' so I should probably just go for the Alfa housing and stick with that. It just niggles me that I know the RS4 MAF would be 'better'. I was in the same dilemma with 'non-stock' EV14 injectors, and look what I ended up doing there

.....now how do I get one with the Audi loom connector

[prj]

I have the connectors, I'll cut your old connector off and fit the new one instead.

[europeanme]

he sure does!!!...

[AndyP]

Is this the B5 RS4 MAF you're talking about using, part number 0280218067?