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09-24-2012, 04:16 PM | #23 | ||
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+1 FMU have been around for a bit and do build some nice things; surprised you've never heard of them esp. considering your part in the BMW community. They are def not amateurs |
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09-24-2012, 04:17 PM | #24 |
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as far as filters are concerned you can def run some mesh over the stacks or get some nice little K&N filters designed for some Mikuni carbs and adapt em (will need some customization but it's been done before)
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09-24-2012, 04:24 PM | #25 |
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I have heard of them, just never dealt directly with them.
Too many assumptions drawn.
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09-24-2012, 07:40 PM | #26 | |
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Kinda just talking out of my ass but the above seems logical to me.
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09-25-2012, 04:01 PM | #27 |
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Or you could...wait for it... wait for it... run a plenum with a big filter on the end!
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09-25-2012, 07:56 PM | #28 |
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I actually had a conversation with them via email a few weeks ago about the stack system. The stack system is currently being re-designed and should incorporate some type of air filter. He said the car would need to be brought to them for a full tune with baseline dyno's etc. I think they have it on the website to show that they have the capability to provide such a system but, its not a product ready to go in a box with software at this point in time (may never be?). Its done on a case by case basis which is why you don't see a price on it.
they said they'd contact me when the new system was closer to being complete.
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09-26-2012, 05:31 PM | #29 |
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I want... this shouldnt heatsoak as bad as some mention because of the meth. Meth brings IAT's down significantly
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09-26-2012, 06:56 PM | #30 |
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Not worth it!!! I am not willing to risk letting my engine getting dusted for a nice looking stack setup.
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10-01-2012, 10:24 PM | #31 |
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Some of you may be interested in checking out this post and some of the videos there showing them in action... not for me without airfilters, but pretty cool:
http://www.m5board.com/vbulletin/e60...ty-stacks.html
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10-01-2012, 10:42 PM | #32 | |
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10-01-2012, 11:07 PM | #33 | |
Id rather be boating...
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10-02-2012, 01:16 AM | #34 | |
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I am not sure if they are actually using the third or fourth wave, but the torque curve of the engine is so flat that they are not using only the first wave, it would be impossible to do so over the 6000RPM that the torque curve stays nearly flat! To answer your question, the energy in the subsequent waves are reduced, but they are still very usable. One thing that is of note, is that as the RPM's climb, the exhaust scavenging effect increases enough to offset the reduction in intensity of the pressure wave in the intake. This scavenging effect is also helping to pull new mixture into the cylinder under valve overlap........ I am sure this is one of the main reasons for the nice equal length primaries and nicely designed merge collectors on the factory headers. Loss in this scavenging effect may be the reason why some x-pipe setups seem to put a hole in the bottom of the torque curve on the S65.
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Last edited by BMRLVR; 10-02-2012 at 01:52 AM.. |
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