Visionaree Posted September 22, 2009 Share Posted September 22, 2009 foot flat boost sits at 13 fine before 4500 but after it drops slowly down to 8. is that a leak? Link to comment https://www.sau.com.au/forums/topic/289085-boost-drops-from-13psi-to-8psi-throughout-4500rpm-and-7000/ Share on other sites More sharing options...
89CAL Posted September 22, 2009 Share Posted September 22, 2009 could be a leak or restriction, check your cooler pipes are all connected nicely and done up tight, Your intake pipe might be closing in to (rubber pipe from turbo to afm) depends on what setup you've got, post up a bit more info could also be your boost controller? manual or electronic? More info and I'm sure someone will be able to help sort it out Link to comment https://www.sau.com.au/forums/topic/289085-boost-drops-from-13psi-to-8psi-throughout-4500rpm-and-7000/#findComment-4840729 Share on other sites More sharing options...
Visionaree Posted September 22, 2009 Author Share Posted September 22, 2009 stupid me sorry lol its running the stock cooler and a manual boost controller. so your saying that the rubber hose could be sucking itself closed? well not closed but smaller. hmm thanks heaps for that il check that all the pipes are tight. Link to comment https://www.sau.com.au/forums/topic/289085-boost-drops-from-13psi-to-8psi-throughout-4500rpm-and-7000/#findComment-4840931 Share on other sites More sharing options...
turael Posted September 23, 2009 Share Posted September 23, 2009 the rubber pipe should have a metal spring in it to stop it from being sucked closed. boost should taper off at the end of your rev range, but probably not that much, what boost controller are you using? Link to comment https://www.sau.com.au/forums/topic/289085-boost-drops-from-13psi-to-8psi-throughout-4500rpm-and-7000/#findComment-4841936 Share on other sites More sharing options...
tridentt150v Posted September 23, 2009 Share Posted September 23, 2009 wastegate creep??? Link to comment https://www.sau.com.au/forums/topic/289085-boost-drops-from-13psi-to-8psi-throughout-4500rpm-and-7000/#findComment-4842910 Share on other sites More sharing options...
mad082 Posted September 23, 2009 Share Posted September 23, 2009 running 13psi through the stock cooler probably isn't the wisest thing in the world to start with, and that may be part of the problem. other possible causes: boost controller issue dump pipe issue (what size exhaust do you have) boost leak blocked or damaged cat fuel or timing issue Link to comment https://www.sau.com.au/forums/topic/289085-boost-drops-from-13psi-to-8psi-throughout-4500rpm-and-7000/#findComment-4843723 Share on other sites More sharing options...
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