Datalog 335I E92 N54 (DCT) Power seems to be lacking in the low end and top end

[Sneaky_N54]

hello everyone. I've recently picked up a 2009 335i e92 with the DCT. I've decided to buy MHD and get stage 1 loaded on the car as it was stock and engine bay was super clean with no modifications done besides the rear muffler flap being disconnected. (Car looks super well looked after inside and out with red leather )

Felt the difference from stock and to be honest, I couldn't really tell any difference, may of been a small amount more torque but nothing to write home about and it doesn't throw up the traction light either no matter what I do. The tune I've got loaded is MHD V10 and V9 (tried both) Stage 1 93 with no extra options enabled besides selecting stock downpipe and making sure transmisson is DCT before flashing. I'm very confused, only thing I did notice is on the highway, when I go WOT the cars pulling okay but about 5k rpm I can feel an extra kick come in and pulls harder so very weird.

(Towards the end of the datalog pull, the car did throw up a half check engine light with the error code (29DC - DME: Cylinder injection cutout) and (2AAF - DME: Fuel pump, plausibility "shadow code")

The guy I bought it off has had a 135I N54 swapped into it (Not sure if that affects anything) due to the last engine dying (Not sure on the story) but this N54 has been inspected and placed in by a respectable German mechanic that builds 600+HP n54's so I do trust where he took it as they are good.

I'm going to pop the datalog below and if anyone could have a look and get back to me if they find something odd, I'll muchly appreciate it as this car is my baby, wanna make sure she's fixed up

- https://datazap.me/u/sneakyn54/2009-bmw-335i-e92-dct?log=0&data=2-3-5-14-20-21-22-23-24

 

[ktb_e92]

Hey, I took a look at your datalog and can see Bank 2 running out of fuel around 6500rpm based on STFT 2, which is causing your limp mode + the codes to pop up. I would look into replacing your low-pressure fuel pump because I suspect that is what the cause is, due to the fuel low pressure psi staying in the 50's and sinking towards the high-40's near 6500rpm under full load. That insufficient pressure is starving the rest of your fuel system which triggers the cutout and limp mode to prevent leaning out your motor and further damaging it. I suggest a Walbro 450lph fuel pump, whether you get it as part of a bucketed or bucket-less setup from any performance site you buy from. I suggest you look into Precision Raceworks.