HPS silicone intake elbow

[R0ME0]

Has anyone tried this on the e85/e86 z4m yet?

http://www.hps-siliconehoses.com/06-...-tube-red.html

I know a few folks that tried to adapt the e46 ones with no place for the vacuum line. This one claims to be specific to the z4m. Did a search with no luck so wanted to see if anyone had tried this yet.

[exdos]

I honestly can't see how the OEM part is described as "restrictive" or how this part will make any significant performance gain. The air passing through this part has just passed through the most restrictive part in the air-intake system, namely, the MAF, and the internal area of the OEM part progressively increases the further away from the MAF as it joins the plenum.

[yousefnjr]

I'm pretty sure the factory plastic piece is bent 90 degrees. It's also huge and wide open, so I'm not sure where the restriction comes in. The ID on both ends would have to be identical anyway for this thing to fit, otherwise you would need a wider MAF and manifold.

I've also purchased a very similar piece, made from the same material but admittedly smaller, for around $13 if my memory is working.

[R0ME0]

Originally Posted by yousefnjr

I'm pretty sure the factory plastic piece is bent 90 degrees. It's also huge and wide open, so I'm not sure where the restriction comes in. The ID on both ends would have to be identical anyway for this thing to fit, otherwise you would need a wider MAF and manifold.

I've also purchased a very similar piece, made from the same material but admittedly smaller, for around $13 if my memory is working.

Do you have pics?

[beta]

http://www.zpost.com/forums/showthread.php?t=306405

[R0ME0]

Originally Posted by beta

http://www.zpost.com/forums/showthread.php?t=306405

Yes I saw this post but that one doesn't have the vacuum line port nor pictures. I'm hoping someone has tried this. Would love to get feedback!

[johanness]

Originally Posted by exdos

I honestly can't see how the OEM part is described as "restrictive" or how this part will make any significant performance gain. The air passing through this part has just passed through the most restrictive part in the air-intake system, namely, the MAF, and the internal area of the OEM part progressively increases the further away from the MAF as it joins the plenum.

Well it certainly won't net the same returns as the 370bhp from your custom intake alone... That's for sure

[exdos]

Originally Posted by johanness

Well it certainly won't net the same returns as the 370bhp from your custom intake alone... That's for sure

Exactly!

Here are a few photos of the OEM part.



As can be seen the inside is very smooth/polished



I've run a stream of water over the corrugated section at the inlet end of the elbow to show any restriction that might occur. It appears to me that this has a tendency to spread a "boundary layer" onto the smooth section of the pipe rather than create eddy currents which might impede flow.



The inlet orifice measures 85mm in diameter (Area 56.74sq cms) and the elbow is an increasing taper to the elliptical orifice which measures 110mm x 135mm (Area 116.71sq cms) which is double the size of the inlet. No restriction there.

[R0ME0]

Just heard back from HPS and it appears its the same part as the M3. I have showed them pics and they are working with their R&D Product department to see if they can get the vacuum port added.

[eunosracr]

You can put a breather on the end of the vacuum line and call it a day.