ArcherV2

Just purchased an S15 Spec S with an S14 SR20DET Swap into it. It's running a Tomei D1 ECU with a funky mid-mount IC setup and remote HKS BOV but other than that relatively stock.

The trouble starts as I start to build boost, around 3.5K RPM @ wide open throttle, the car begins to throttle itself back and not want to boost anymore. My boost gauge works itself up to 0.5 KG and then sits there while the car begins to make a noise I can only type out as "brbrbrbrbrbrbr" while I feel an almost complete loss of acceleration. This happens in all gears, working my way through the gears at 50 - 60% throttle has no issues. It's only under heavy throttle that the problem appears.

Things I've checked:

• Examined and cleaned the MAF
• Replaced spark plugs and ensured coils are seated
• Checked my IC piping and hoses for any obvious leaks/cracks

See my engine bay below!