S14 SR Is Breaking Up - Vid Inside

[SequenceGarage]

Hey guys, first of all to start i've spent hours on the car myself and have taken it to several professionals and no one could fix the car without spending an entire day on it. I have come to the point where its time to rip apart the dash and take the harness out and go over it wire by wire. This will be a pita but clearly it is the only way to solve this problem (and potentially cause new problems)

The Problem: ever since I installed the SR the car would break up under heavy load. What is heavy load? Well it was not ever one specific thing, sometimes under low boost the car would break up, sometimes I could run 1bar and not have an issue.

What is breaking up? It seems liek the ECU is resetting, spark is definatly pulled and injectors I belive are also pulled. Sometimes (however not always) the check engine light will flicker on and the tach would drop to zero. Imagine pulling power to the ecu and then putting power back to it, it is almost like that. The ECU is storing no codes however, so it makes me think hte ECU isn't seeing it as a problem - i.e. not a faulty sensor, rather the entire ecu is resetting. The car will pop and then accelerate again, usually followed by another pop within the second unless the the throttle is closed.

Specs:

Early S14 VVT SR20DET
Wiring done by an outside job (paid good money for)
Tested different ECU
Tested adding power
Tested adding grounds
Tested grounding engine to chassis better
Tested groudning battery to chassis better
Before and after S-AFC II same problem
Have checked groudns on engine
Have checked main chassis ground by ecu
Have checked eccs relay

So my question is what CAN cause the ecu to reset - in other words what would have to short or fail entirely to cause the above symptoms? I want to know what to keep an eye out for when I open up the harness.

More info that may: help A techtom daughter board was installed for eprom tuning, when the laptop was connected to the ecu for live updates the car would constantly break up with the check engine light flickering and the car popping all the time. Even at idle it did it. Sometimes it would be ok for a minute or so at idle, and then it would start to die again, we could not find any pattern.

This suggests to me that it is most definatly an engine control issue.

Here is a video of the car on a test drive after I just installeda n HKS GT-RS, RPS 6puck clutch and ATS 2way carbon LSD, teh car feels GREAT. It spools to about 5psi just in neutral which is insane, and hte power is so smooth and great, the only problem is the car breaks up at the preset boost (0.8bar i belive is what it comes with) all the time, I couldnt enjoy the car above 4500rpm once unless i was under low load (like spinning the tires in 1st)

http://www.sequence-garage.com/SandraRip.mov (quicktime about 14mb)

If you guys could throw out a couple ideas that would be great! May as well try everythign while I have her apart.

Lastly, I am getting an EMS as soona s they release a 95-96 Japanese S14 SR application, is there any chacne of this problem reoccuring with the EMS?

I hate stupid problems like this, I paid to have my harness done so that i would for sure NOT have stupid gremlins like this, however that doesn't mean it isn't something I'm doing wrong. Thanks again guys sorry for the super rediculous long post.