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Manual Boost Control opinions wanted

How to go faster, stop quicker, and turn harder. Chips, exhaust, larger turbos, bigger/slotted/drilled rotors, high performance brake pads, manual boost controllers, performance shocks/struts/springs, airbox mods and more! Also discussion on HID and Xenon lights, aftermarket foglights and other exterior lighting.
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matthew1
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Re: Manual Boost Control opinions wanted

Post by matthew1 » Sun Apr 06, 2014 7:09 pm

Hmm. I can see a shop not wanting to work on a car with an MBC because it adds a few more variables to the already complex equation of modern cars, but I can't say the poor-quality-MBC complaint makes sense. MBCs are dead-simple mechanical devices. They either work or don't.

An 850's steering wheel is a hundred times more complex.

... not jumping on you. Just giving my 2¢.
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1997 850 T5, MSD ignition coil, Hallman manual boost controller, injectors, R bumper, OMP strut brace [gone]
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Re: Manual Boost Control opinions wanted

Post by bouldergeek » Sun Apr 06, 2014 9:24 pm

Yeah, I concur.

I think they were just pointing out to me that an MBC is a sub-optimal hack. ANd if can have problematic outcomes if not used judiciously.

Just like becoming root in UNIX, with great power comes great responsibility. You very well can detonate your device.
That was the only MBC story I had to tell. :-)

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matthew1
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Re: Manual Boost Control opinions wanted

Post by matthew1 » Sun Apr 06, 2014 9:55 pm

Well thanks for sharing. :-) Ain't DIY grand?
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1997 850 T5, MSD ignition coil, Hallman manual boost controller, injectors, R bumper, OMP strut brace [gone]
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Re: Manual Boost Control opinions wanted

Post by epukerob » Tue Apr 29, 2014 9:16 am

97_boostedgLt wrote:MBC+Properly Tuned ECU= LOTS OF FUN! of course stage zero and other little mods. Its all in the tune of the ecu! my ecu is tuned to only allow 3lbs in 1st and so forth, or once im passed 3000 rpm all hell breaks lose! Have my 850 gLT with the 13g turbo pushing 12 lbs of boost at 242 hp all day long and not a single problem! LOTS OF FUN!
Hey 97, good testimonial although I am still puzzled how the MBC can possibly work with an original TCV in yours or any other scenario. In Geoffrey's diagram above, the N75 essentially bypasses the MBC and renders it useless; if the MBC is set for 14psi and the ECU-controlled N75 opens at 10, then the boost is 10. So... you mentioned you have an ECU tune... that is where you have set the 12psi peak boost level?? How is your MBC configger-ed?

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