Question about 1990 Subaru Legacy

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My rs legacy keeps loosing boost randomnly

My 1990 rs legacy randomnly looses boost it normally runs 10psi but just drops to 5psi randomnly

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Check wastegate(round valve on turbo)is working it may be loosing vacuum,or you have an electrical issue with the boost controler,but check wastegate first as its easier and could be the problem

Posted on Oct 29, 2009

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Losing boost!! I have a 1993 mazda rx7 13b twin turbo with the stock turbos. When i punch it my boost goes up to about 10psi. But bleeds off and i can head it blowing out. Was thinking it was blow off...


Have you checked all the tubing cuplings? When mine was doing that i had a cupling that would keep sliding off just enuff that it was letting out air and loosing me boost.

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Hi i have a 1990 subaru legacy rs BC5 single turbo it seems to blow turbos all the time, the blow off valve opens up on idle even through the boost gauge reads zero and when it drives and hits boost it...


Hello, that is a puzzler, but the blow off valve opening up at an idle is making me think exhaust/catalytic converter restriction causing to much back pressure. Like it can't get the air through fast enough so it's backing up in the intake. I would start my chase there... Let me know if you find any thing...(subyguru)...

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