Dyno'ed in 3rd gear - remember it's a 4spd Auto. 4th is just a cruising at over 100kmp/h gear, infact I can't use it under 100kmp/h.
Sam has no idea, I spent until midnight there one night. No-one has any idea why. My auto builder said it's not the auto, the car should make more power. You lose power through an auto but you don't not gain anything by winding up the boost. I can't gain a single kw.
Plenum is stock. My cooler and intake pipes are all mandrel bent. I'm not sure how the spacer plate could cause an issue as it's the exact shape of the manifold and there's no exhaust leaks, it's not restricting exhaust gases. The stock GTi-R manifold could be a restriction, however the car boosts well.
The health of the engine? I'm not sure. It's been in my car for roughly 20,000km and it's roughly 10 years old with no history. I bought it as a bare engine with '50,000km or less'. Judging my the condition under the rocker cover, it may not have been exactly correct. It was a bit sludgy but that's long since gone. I haven't had it compression tested, but I've never had reason to suspect that anything wrong with it. It's had probably 5 or more coolant flushes in 20,000km (or various reasons), probably 10 oil changes, multiple gaskets replaced, a brand new timing chain, tensioner and guides. That makes me think - could cam timing be out?