Highly Modded Z4 Misfire During Boost

[MikeyVenture]

Hey all, first post here.
I own a highly modded E89 Z4 that has developed a horrible misfire under heavy boost. I can putt around in it just fine with no issue at all, but the moment I give it the beans, it falls over on its face.
Diag revealed zero on-time for injector 1. So dead injector.

Here’s my question:
The car has Motiv port injection. I bought the car already modded, and as this is my first and only BMW, I don’t have a ton of experience with how these platforms are laid out. My understanding is that the port injection is secondary and the car retains direct injection. So I assume the dead injector would be the DI and nothing to do with the port injection.
I’ll supply the build sheet below, but I need to know which injectors to put back in, and how/what is needed to code them properly. Also, I’ve reached out to the builder and have gotten no response. Going to try to follow up Monday, but judging by the build sheet, what would be a solid replacement for injectors?

Total noob here, so sorry for any dumb questions! I appreciate any help.
Build sheet below.

2011 BMW Z4 S-Drive 35i
25,000 miles
Over 600whp (confirmed on dyno with proof)
Stage 2+ VTT Turbos
VTT Cold side / Hot side inlets
ADE 1000hp Front Mount Intercooler
Bimmerlife coils + n20 plugs
Motiv Port Injection Motiv Custom Tune
Fuel-it Stage 2 Pump + Secondary Port Injection Pump
UUC Short Throw Shifter
Tial Blowoff Valve
MFactory Single Mass Flywheel
Spec Stage 3+ Clutch
Catless Wagner Downpipe
Supersprint Midpipe
Remus Catback w/ Carbon Fiber Tips
CSR Radiator
ECS Carbon Fiber Intake
KWv3 Coilover Suspension (Corner Balanced)
19x8.5 / 19x9.5 CH-R BBS Wheels
Michellin Cup 2 Tires
BMW Performance Big Brake Kit
3D Design Front Lip
3D Design Rear Diffuser
MSport Rear Bumper
Custom Wrapped MSport Steering Wheel
All work done by Robert Boreham with Boreham Motorsports (Phoenix)

[B21]

You’re in a world of pain there…without access to the builder and tuner you’re flying blind..even a tuned non port injection n54 is a complex beast ..assuming the injector that died is a real one .,it will have an index number…in simple terms you need to buy an injector with the same index number ..or replace the other two in the bank of 3..fcp euro do good explanations on this…the injector has two sets of calibration numbers and you need a bmw coding tool ISTA or Protool to code the new injector s with the DME

[MikeyVenture]

Originally Posted by B21

You’re in a world of pain there…without access to the builder and tuner you’re flying blind..even a tuned non port injection n54 is a complex beast ..assuming the injector that died is a real one .,it will have an index number…in simple terms you need to buy an injector with the same index number ..or replace the other two in the bank of 3..fcp euro do good explanations on this…the injector has two sets of calibration numbers and you need a bmw coding tool ISTA or Protool to code the new injector s with the DME

I appreciate the info! Sounds like my next step is to pull the injector(s) out and go from there, and continue trying to make contact with the builder.

[MRCW]

have you posted or checked spool street

the folks there are very good at high end mods...