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Those running an MBC with K03's, who is running it with N75?

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Old 06-09-2004, 12:41 PM
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Default Those running an MBC with K03's, who is running it with N75?
What are the advantages of running MBC by itself & also MBC/N75 together?
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Old 06-09-2004, 12:50 PM
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Default I run an MBC w/ N75 on K03s....
The advantage of having an MBC/N75 together on K03s is that you control how much peak boost you make. It is nice to be able to alter this depending on the situation (track, drag strip, daily driving, etc)....

<img src="http://pictureposter.audiworld.com/69223/block_115-mbc_and_n75_in_parallel.jpg">

The advantages of going MBC only are the same as MBC/N75 plus you run slightly more boost in the higher RPMs (I don't consider this an advantage since our tiny turbos can barely handle it)....

<img src="http://pictureposter.audiworld.com/69223/block_115-mbc_only-57d.jpg">
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Old 06-09-2004, 12:57 PM
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Would this in effect "chip" your car?crank up the boost?
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Old 06-09-2004, 12:58 PM
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Default No. You will cut throttle if you go too far beyond the requested boost levels.
Plus, the chips effect more than just boost levels.
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Old 06-09-2004, 01:00 PM
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Hey Doc...YGM
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Old 06-09-2004, 01:05 PM
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Very bad idea. Won't work.
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Old 06-09-2004, 01:13 PM
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YGM back
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Old 06-09-2004, 01:14 PM
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Very bad idea...very bad...very bad &lt;Rain man&gt;
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Old 06-09-2004, 01:45 PM
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Default I'm running MBC solo with K03's. It's fast... but probably won't win any reliability contests :)
I have the turbos running at the ragged edge of the compressor map throughout the rev range. A TCD is required, otherwise the ECU uses the throttle to limit boost.
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Old 06-09-2004, 01:59 PM
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Bingo!
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