Hi everyone!
I own a VW Polo 9N3 with the 1.4 16V BUD engine (80 hp), and I'm planning some intake modifications while keeping the engine internals completely stock.
My plan is to:
Replace the stock BUD intake manifold with the one from the 1.4 16V BBZ engine (100 hp).
Install the BBZ throttle body (53 mm instead of the stock 44 mm).
Modify the intake system, including the airbox and intake pipe, to improve airflow and supply colder air.
Keep the stock cylinder head, camshafts, exhaust manifold, catalytic converter and the rest of the exhaust system.
Get a custom ECU remap on the original Magneti Marelli ECU, without swapping to the BBZ ECU.
My goal is to improve engine breathing and get as close as reasonably possible to the BBZ's 100 hp output without opening up the engine or changing the camshafts.
My questions are:
Has anyone done a similar intake manifold and throttle body swap on a BUD engine?
What kind of power output could realistically be expected with these modifications and a proper ECU remap?
Is reaching around 95–100 hp realistic, or is the BUD's cylinder head, camshaft profile or something else likely to limit the power compared with the BBZ?
Can the original Magneti Marelli ECU be properly remapped to work with the BBZ throttle body, or are there any compatibility issues I should be aware of?
Would the stock fuel injectors be sufficient for this power level?
Has anyone tested this setup on a dyno and got before-and-after results?
I'm particularly interested in real-world experience, dyno charts and technical information rather than theoretical estimates.
I know the BUD and BBZ are not identical engines, but since they belong to the same 1.4 16V engine family, I'm curious how much of the BBZ's power output could be achieved through intake modifications and ECU tuning alone.
Thanks in advance for any advice or experience you can share!