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be very careful with MBC's on C900s
Posted by Dean [Email] (more from Dean) on Thu, 9 Feb 2006 07:27:01
In Reply to: Re: if its a 93 its 2.4 LH & the limit is inside the rom, Don
[Profile/Gallery]
, Thu, 9 Feb 2006 05:00:53
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A MBC will provide complete control over the boost level. I am thinking that it was not installed/adjusted properly. In most setups, the pressure will be limited by a fuel cut device or ECU function.
A MBC+A provides better control than a MBC alone, but otherwise the two are trying to do the same thing. A MBC+A, by eliminating boost pressure overshoots, allows for higher settings by not needing to back off to avoid the overhshoots hitting the fuel cut. In its full configuration, it also takes its feedback pressure from the TB instead of the compressor housing hose bark. That allows for a flat boost curve instead of having boost droop with RPMs as the flows generate pressure drops across the IC.
MBC's on the C900 are not something to be done without care and understanding. The C900 needs attention to fuel pressures and injector sizes at higher levels of boost. These engines will knock if pushed the wrong way. Otherwise, one should first reduce intake and exhaust restrictions before increasing boost in any fashion. Cold air intakes are important and water injection make be required for some configuations.
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