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resistor across the pressure transducer.. revisited.
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Posted by Andrew [Email] (#1013) [Profile/Gallery] (more from Andrew) on Sat, 26 Oct 2002 22:10:32 Share Post by Email
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A few days ago I posted re putting a 300ohm resistor in parallel with the Pressure Transducer on Junior's '87 9000 Turbo.. for an "internet" suggested slight boost gain. Well it didn't happen.. back to the Diagnostics :-).. replaced the pressure transducer with a NEW one.. stopped the annoying "clacking" at idle but little else.
Car currently boosts to 12 psi and drops to 10 psi..OK..but Saab Specs as read TODAY inna Saab Factory Manual sez 13.8 boost and 5.8 Base Boost.. mine is now set to 5.8 (or as close as my 2% accurate Boost gauge can indicate)
Putting a 300ohm resistor in Parallel (accross the spade terminals) yields a 3psi boost LOSS!.. 200 ohms yields a 2psi LOSS!.. somewhat in Variance with what postings here indicate... WHY!!??
System is apparently fine, I have tested everything at least twice, substituting "known good" parts for *everything* except the Turbo itself with NO appreciably different result.
Am I missing something Basic here or does a '87 9k respond differently to this 'Mod' than a '82 c900 ! ?
Any opinions gratefully considered.


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