BMW Z4 3.0Si induction kit self build

GazHyde

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Time to see if I've done my sums right!

First thing was to remove the original air box which wasn't particularly interesting, we then removed the induction system which attaches to the inlet manifold on the side of the engine.

Next we need to get over the slight issue of the diameter of the MAF housing being identical to the induction pipe work. The housing has a milled recess in it leaving a slight lip at the end. 10 minutes in the vice saw this filed down flush with a slight angled edge to it. A liberal application of grease to the housing, and heat to the plastic piping allowed it to be forced inside.
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A nice tight fit, just need to add the jubilee clip.
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A view of the entire induction setup. Blue is the connection to the engine inlet, and red is to the "sound generator" which pipes induction noise in to the cabin.
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Back to the engine bay to connect everything up! I need to fabricate a bracket to hold the filter in direct line with the air flow which comes piped through from behind the kidney grills. Hard to see where it comes in, but it's highlighted in red in the pictures.
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The verdict!

A bit early to tell as the ECU will need to adjust itself to match the change in air flow. However after about 20 miles there is a noticable difference, mainly in the lower rev range (idle through to 3k). It's definitely revving and pulling smoother and a bit harder up to 3k, but not as noticeable as much above that. There is a nice growl around 5.5-6k which is rather pleasing.

It's pretty much as I've expected and in line with the induction kits on the 2.0 & 2.2's. No extra noticeable power, just smoother all round.
 

GazHyde

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These N52 engines are so darned finicky. Been chasing a couple of fault codes "P0171 & P0174 engine running lean on both banks" since fitting the induction kit, most likely cause from research points to be the MAF. Some of the issues I've had before the induction kit was fitted were also possibly linked to the MAF. So, new MAF it is then...

The annoying thing is that the car drives better than it ever has even with the engine management light on, but it has dropped 2-3 mpg over the last couple of tanks.

£145 from a eBay seller for a genuine Continental/VDO unit. Managed to drop it in this evening, but my code reader hasn't arrived yet so can't reset the codes. Will see what happens on the drive to work tomorrow!
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Grumps

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I have to say Gaz that looks bloody great! Well done for having a go and once it's set up to accommodate the changes I'm sure it'll have been well worth the effort.
 
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