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Old 01-05-2004, 11:44 PM   #1
KJR
Scooby Specialist
 
Member#: 16879
Join Date: Mar 2002
Chapter/Region: SCIC
Default strange boost fluctuation...help needed

I have been getting a rythmic boost fluctuation of about 4 PSI ONLY when in open loop, not when at partial throttle. i am using the FBC so i'm at stock boost right now. under partial throttle it will hold about 8 PSI firm with no fluctuation. it boosts to 14-14.5 and then comes down to about 10 psi and then goes back up when holding WOT thru the rev band. the higher the gear the worse it gets. i have checked and double checked the hoses from the FBC, wastegate and the turbo outlet and all connectors, the intake manifold as well as the bov and TB.
NOTE: all of this dissappears when i install an MBC. it holds boost firm when using any aftermarket boost controller. is my FBC going bad? is it normal to only do this in open loop? any advise would be appreciated. thanks,
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