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strange secondary boost problem

Old May 1, 2008 | 11:04 PM
  #1  
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strange secondary boost problem

here's my issue, I ran wot through 2nd, 3rd and part of 4th had usual 10 psi through transition, drop to 8 spike to 11 then back to ten for a split second then dropped to 7-7.5 and stayed there consistently through those gears on multiple pulls. If it was a leak it would be present though both phases of boost. So I'm kinda stumped any ideas or help would be great.
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Old May 1, 2008 | 11:16 PM
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are your wot runs after the incident do the same. maybe your wastegate vac hose popped off while driving...
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Old May 2, 2008 | 08:42 AM
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they're all the same, it gives full boost through primary starts with full in secondary and drops down.
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Old May 2, 2008 | 09:33 AM
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its something in the rats nest most likely. either a vacuum hose, a check valve, or a solenoid. Learn as much as you can about the sequential system and replace all the hoses with silicone ones, or you will be frustrated with problems like this all the time.
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Old May 2, 2008 | 10:06 AM
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^ +1 ^ the sequential system is a complicated piece of crap especially with stange problems like that. could be a number of things. i never bothered to learn the system, i just went single. i'm gonna say u have a vac. leak somewhere. best to replace all of the hoses. remember to do one at a time or u will end up in a nightmare like i did once LoL
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Old May 2, 2008 | 07:03 PM
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so...if i'm understanding this correctly. your pattern is 10-8-11 then it drops off to about 8spi again. very possible its a soleniod or a vac hose but it sounds like a prespool problem to me.
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Old May 4, 2008 | 04:12 AM
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it very well could be a prespool issue, i replaced all my vac hoses 3k ago and checked all the solenoids at the same time so i doubt it's either of those
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Old May 4, 2008 | 05:23 AM
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did you remember to put the pills back in the prespool and wastegate lines. if you did put them back in...are they in exactly the same way they came out?
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