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BMW 3-Series (E90 E92) Forum
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Stage 3 IM Port sizing?
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11-13-2017, 05:51 PM | #1 |
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Stage 3 IM Port sizing?
I swapped off my 325i stage 1 manifold for a stage 3 im however I noticed that the ports are smaller on the upgraded manifold. I am curious as I believe mine came off a 323i in the Canadian market (2 disa's).
I feel a slight difference however tune coming soon will help. Just curious about the port sizing. |
11-13-2017, 08:07 PM | #3 |
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11-13-2017, 10:21 PM | #4 |
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11-23-2017, 09:36 AM | #5 |
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Got a response from johnmyster that Ill share for the public..
johnmyster 09:12 AM Today I saw your thread. Yes, it seems that in other markets, the smaller displacement N52 motors got the 3 stage manifolds...but the intake runners were smaller to match smaller intake ports in the head. in the US, everything was B30 but detuned by software and manifold. I’m not sure what it would mean in terms of power output. If properly tuned smaller runners could increase cylinder filling at lower RPM than larger runners. |
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11-27-2017, 12:59 PM | #6 |
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I've always wondered why the PN for the 3IM on Canadian 323 was different (11617559525 instead of 11617559523). To add to the confusion, European 323 uses 11617559526...
http://www.realoem.com/bmw/enUS/show...diagId=11_3756 |
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11-28-2017, 06:33 AM | #7 | |
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The 323i stage 3 im in Canada is off a n52b25. It also has smaller bore (82mm vs 85mm on 330s). I am going to take a side by side once my stage 3 from a n52b30 comes!
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04-08-2018, 09:37 AM | #8 |
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Port sizing pics
Bottom off a n52b30
Top off a n52b25 (Canadian 323i) |
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04-08-2018, 11:05 AM | #9 |
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Makes sense, smaller ports for the smaller engine.
Smaller ports might make more TQ and less top end HP on the 3L. |
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04-09-2018, 07:29 AM | #11 |
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It does. There was just a debate about the Canadian 323i being THE EXACT same as a regular 328/330 stage 3. Other than port sizing, everything else is the same. Still decided to buy an actually n52b30 mani
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04-10-2018, 12:08 AM | #12 | |
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Quote:
http://www.realoem.com/bmw/enUS/show...diagId=11_3734 http://www.realoem.com/bmw/enUS/show...diagId=11_3734 |
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