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Rundown of the car:
S4 NA
Mazdatrix Street port
K&N intake
Header, catback and cat delete.
Rtek2.0

Before I installed the RTEK 2.0 The car ran very lean, around 18:1 AFR under load. Now I have the RTEK installed and have the fueling down into the 13s. I had to add 35% fuel to get it there though. Does this seem right? Doing the math to get from 18 to 13 AFR, adding 35% fuel is plausible, but I am wondering if I have something else wrong with the fuel supply.

Injector duty cycles are under or at 50%, so obviously I am not running out of injector.

I pulled the fuel pump thinking the sock was clogged. There was a little metallic debris on it that I cleaned off, but not enough to hamper flow. The inside of the tank looked brand new. No rust at all in there. There is 13 volts getting to the pump while the car is running.

I have not checked the fuel pressure yet, and probably will this weekend.

The fuel pump has 210 thousand miles on it. While it still works, could it be getting weak? I have a replacement that is coming in the mail, so I guess we will find out.

My next step is looking at the injectors, and the fuel pressure regulator if I am seeing low fuel pressure.

 

I'd wager most Removed fuel on the non turbo. I said Most not all.

Remove your airpump belt and go for a ride and compare those results with the ones you made with the airpump belt on.

 

Typically the stock fuel curve is quite rich, so most people pull fuel out. With the street port, along with high flow exhaust, I could see it needing more fuel. Any port work changes the way the engine breathes by quite a bit requiring tuning..

 

Well, I know the car is modded but I've added way more fuel than I would normally have to (I assume).

I added 50% fuel correction and the car runs in the 13 AFR range now under load.. Injector duty cycles are in the mid/high 50% range. The car has the stock 460cc injectors.

I think I have something up with my primary injectors because the car runs lean and inconsistent before the secondaries kick in. When the secondaries come online the car takes off and pulls very well now that it has some fuel.

Make no mistake, I am COMPLETELY satisfied with my RTEK purchase. It is a great deal for all that it can do.