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overview
Take-apart Pic
installed in 1g DSM |
The kit includes all items needed
for installation
1. Lightweight aluminum body
2. Black Knurled Thumb Screw sets boost - no tools are required to set
3. Knurled Thumb Locknut - no tools required to lock
4. Easier adjustment - approx 2psi per 1/4turn means easier fine tuning
and resetting.
5. Brass fittings with multiple barbs
6. O-ring seal at lock nut
7. Dual Ball design. Small ball eliminates spring from "winding up".
Large ball seals air.
6. Universal mounting bracket, hoses, 'T' fitting, plugs & ties
are included
**INSTALL PDF**
How they work: Boost
pressure goes into the MBC and is stopped by an internal ball, spring
loaded against the thumb screw. When boost pressure exceeds
the spring pressure, air bypasses the ball and sends pressure to the
waste gate. This slows the Turbine, reducing Compressor boost
pressure. Unlike most electronic boost controllers which are
"open loop", just bleeding off air at a set duty cycle, this is a closed loop control system
meaning boost pressure is a feedback source. At boost pressure
above about 13, the boost may spike up above the set point, because
of pressure dynamics. A small air bleed fitting is installed into
the waste gate line to reduce this.
Disclaimer: These products can result in major
engine damage if not properly installed. The buyer accepts responsibility
for correct installation and any damage resulting from installation.
The buyer must insure all other engine components are capable of
the set boost.
Why an inexpensive Manual Boost Controller works better than an
expensive electronic one:
The Electronic BC sets a duty cycle of time boost is sent to
the WGA and time it is vented (like 50% is 50%on, 50%off) Since the WGA
sees boost only 50% of the time, the door is open 50% of the time, letting
exhaust thru which slows spool-up. At high rpm the turbo puts out alot
more gas pushing the WGA door open, but the actuator still only works 50% of the
time, so boost can drop.
A Manual BC sends no boost to the WGA until set boost is
reached for maximum spool-up speed. Then as boost pressure increases, so
does the pressure to the WGA which opens the WGA and lowers the boost. As
boost drops, pressure to the WGA drops to close the WGA and causes
boost to rise. So desired boost is controlled much more accurately.
AN AFTERMARKET BOOST GAUGE CONNECTED TO INTAKE MANIFOLD PRESSURE MUST
BE INSTALLED PRIOR TO MBC INSTALLATION. THE STOCK DSM GAUGE DOES NOT
READ ACTUAL BOOST. IT MAY READ 13 AT 30PSI ACTUAL! ALWAYS USE CAUTION
WHEN ROAD TESTING UNTIL THE MBC IS PROPERLY SET.
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