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Boost pressure hunting
Posted by Giovanni [Email] (more from Giovanni) on Wed, 23 Jun 2004 17:14:00
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My NG 97SET has a 2.5" airbox snorkel, K&N filter and MBC+A. When I go at high speed on an uphill road the boost pressure is not steady and goes up and down about a fourth of the red sector. It reminds me of a control system hunting and I suspect that is the MBC valve that causes the waste actuator to keep on correcting the boost pressure. The car runs smooth though and the problem does not happen during boost transition in other conditions.
Does this problem happen to others with the same set up?
Another problem I have seen with MBC+A is the very frequent boost cut outs that occur when I drive with a full load as oppose to just by myself. No long ago I drove the car with 5 people in it and would get cut outs very easily. I set the MBC+A with no passengers onboard so the engine revs up fast thus sucking in the increasing boost. When loaded the engine is slow to react to an increase on the trottle, more fuel spools up the turbine and the boost increases faster than engine speed. That's my explanation. Dean and Jeff, is there anything that can be done to correct the problem?
Cheers
Giovanni
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