Swirl flaps and Walnut blasting N47

[Rossco196x]

Hi my N47 engine in my E92 has always been rather sluggish despite being the bi Turbo 123D variant with a remap and hence i decided to remove the inlet manifold after the smoke tester identified a rather large leak around the swirl flap shaft where the actuator fits at the front of the engine.

Question 1: Its done 115k miles and the manifold is rather dirty and also the inlet tracks hence is there any where offering mobile walnut blasting local to Portsmouth or should i buy the gear and do it myself as i have a compressor.

Question 2: I have the swirl flap delete kit but would it be better to buy a new manifold and retain the swirl flaps as i fear the gain in top end power only is not worth the loss in bottom end power and a lower mpg associated with removing the flaps.

Thanks in advance

RossCo

[Jakg]

Rossco196x said:

Hi my N47 engine in my E92 has always been rather sluggish despite being the bi Turbo 123D variant

I didn't think that engine ever ended up in an E9x

[Rossco196x]

Mine is a D3 Alpina Bi Turbo and it is fitted with an N47 4 cylinder that is basically the same as a 123d engine

[danb79]

Rossco196x said:

Hi my N47 engine in my E92 has always been rather sluggish despite being the bi Turbo 123D variant with a remap and hence i decided to remove the inlet manifold after the smoke tester identified a rather large leak around the swirl flap shaft where the actuator fits at the front of the engine.

Question 1: Its done 115k miles and the manifold is rather dirty and also the inlet tracks hence is there any where offering mobile walnut blasting local to Portsmouth or should i buy the gear and do it myself as i have a compressor.

Question 2: I have the swirl flap delete kit but would it be better to buy a new manifold and retain the swirl flaps as i fear the gain in top end power only is not worth the loss in bottom end power and a lower mpg associated with removing the flaps.

Thanks in advance

RossCo

IMO just buy a new manifold; keep the flaps in situ as they help with the torque etc - they've done this this far, why try and fix what's not broken?