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I had the same issue...
Posted by barg [Email] (more from barg) on Sat, 26 Aug 2006 23:19:15
In Reply to: APC Please Help!!, Marko, Fri, 25 Aug 2006 17:53:49
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I had the same issues with my 88 C900. SD SPC, 30# injectors, jak's chip, advanced timing etc. Was still only getting 12 psi at WOT. It's hard to determine what the problem was, whether it was the wastegate opening under pressure, of the blowoff valve, or the APC.
To find out if it's your wastegate, do the pin 19 APC mod:
Then go for a nice spirited drive. If the light flashes, the APC is detecting knock and opening the wastegate properly... which means that adjusting the wastegate isn't going to help you. If the light _doesn't_ flash then try a helper spring on the wastegate.
I was seeing the flashing red light, so I installed a water injection system, and now boost 17-20 psi stable at WOT.
V.
APC pin 19 mod
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