Stock ECU MAF replacement project

[Rocco]

I think people understood that the first three times you said it

Anyway, yeah, this is for custom mapped setups.
And doing Ross' car is not a problem, if he chooses this route, as I'll be over in the UK in October...

and in the north of Spain too true??

[prj]

Yes, yes...

[Thuppu]

Maxed out the RS4 HFM5 with the help of my friend Jason at AMD:

540whp (~700 crank), M2.3.2.

Seems that I need to change the turbo to a HX40 super. Any info about the specs, turbo, cams, head, injectors etc..?

[prj]

Seems that I need to change the turbo to a HX40 super. Any info about the specs, turbo, cams, head, injectors etc..?

China rods, stock pistons, 7A cams, built head, completely maxed 630cc injectors at 4 bar, relayed 044 pump.
HX40 Super is a bit too much, at least if you want to drive it on your street, just like this GT35R. At least in my opinion...

I'd say a HX35 or a GT30R is all that is needed.

[S2central.net]

The combination of cams and headwork shows nice result beyond 6000rpm... and the GT35 is clearly up for the flow requirements !!!
Any idea on compression ratio here for reference ?

[prj]

Stock CR

[Thuppu]

Hmm, HX35 is a ~500 crank hp turbo, my CT should be that also, hopefully. Garretts are too expencive for me.

[A80Avant]

going by the rule of thumb and repo's previous indications, injectors on a 5cyl are roughly making the amount of power in hp crank as their cc @ 3bar,

in other words, maxed out 630cc should give around 630crank.

to me GT35 is a bit optimistic for 700hp

nonetheless, the idea here is to prove that RS4 maf is more than enough for at least more than 600hp, so the ultimate problem with the RS2 motronic mapping is now gone!

Good news Dmitri and well done, as this was a huge problem for those being on the limit of RS2 Maf of around 500ish hp. Now they can get a map done properly at least if they dont look to map themselves and get into it.

[prj]

going by the rule of thumb and repo's previous indications, injectors on a 5cyl are roughly making the amount of power in hp crank as their cc @ 3bar,

in other words, maxed out 630cc should give around 630crank.

to me GT35 is a bit optimistic for 700hp

If you look at picture you can see it's race octane. Jason's dyno is brutal - put that car onto any other dyno, and you will see higher numbers.

Good news Dmitri and well done, as this was a huge problem for those being on the limit of RS2 Maf of around 500ish hp. Now they can get a map done properly at least if they dont look to map themselves and get into it.

500?
MAF is maxed out on a 3071 car from 4000 rpm to redline.
Stock MAF can't even read 400hp.

[orangepeel]

prj is there anything for the 3b maf that can be done that dosent cost the earth or have to buy one

[prj]

In theory yes, in practice you will just have to buy a new maf.

[orangepeel]

In That Case Dose Any One Need A Kidney Or A Liver So I Can Buy A New Maf

[EspenW]

Safe to say a large margin... Dyno sheet looks good!

Thanks Jason, and welcome to the forum

[Jamo]

What is the physical size of the RS4 Maf?

[Rocco]

What is the physical size of the RS4 Maf?

9.2cm i think