Thank you very very much for your data. Exactly what I expected – your data confirmed my considerations according the crossovers. Lower pressure on your MAP-sensor – less fuel – thats the way the ecu works. You only need a tune!!!

If you look in the supercharger map – you see – lowering boost pressure gives you possibly only 2-3% more air flow. Additional high end power comes from this and less loss power of the supercharger. Mid range power comes from lower pressure differential (less fresh air loss) at valve overlap.

If you only make higher fuel pressure – the ecu will work against it – it will adapt to lamba=1 when cruising. Fuel injection time goes down. The adaption factor – I assume – will be multiplied on the wot-map. The adaption factor is ONE factor – it doesn΄t differ on the rpm range – and that’s the problem.

The impact of removing the restriction is only on wot on high rpm – thats why you go lean – the dynamic pressure increases with air flow squared. With the crossovers dynamic pressure is nearly gone – (and it came only on high rpm). Your new tune should give you more fuel especially at high rpm.

Think about this: before removing the restriction – higher pressure is INDICATED. The sensors are infront of the restriction – behind it the pressure is lower. After removing the restriction – lower pressure is indicated – behind the sensors the pressure keeps the same.