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VIVA LA M.A.S.H. Midwest
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1,451 Posts
Discussion Starter · #1 ·
Got a crazy idea to plumb a relief vavle set at a certain psi to pop if a boost spike hits.... or even better.... a ghetto way of controling boost psi without the use of the wastegate.... plumbed back into the intake of the turbo so I would not get a boost leak under normal boosting.
Any body ever heard of doing this and what are your thoughs?
 
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3,796 Posts
Wastegates are good because the exhaust turbine is restrictive. Why waste the energy of flowing hella air into the atmosphere?
 
G

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silver88,
sounds like you're speaking of routing the wastegate back into the intake?
if that's the case, that's bad....wastegate gases = combusted gases thus it'll cause a condition of running too....rich? you'll be pumping in less combustible O2 into the engine but the AFM will still feed fuel as it's being read through the AFM...it won't distinguish between hydrocarbons and air

melloboy
 

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the clever guy
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782 Posts
silver88,
sounds like you're speaking of routing the wastegate back into the intake?
if that's the case, that's bad....wastegate gases = combusted gases thus it'll cause a condition of running too....rich? you'll be pumping in less combustible O2 into the engine but the AFM will still feed fuel as it's being read through the AFM...it won't distinguish between hydrocarbons and air
^:scratch: Way off man. He's refering to something that bleeds off excess boost from the intake tract. I've heard a little about them but with relatively (compared to "back in the day") good control via wastegates, pop-off valves (is that right?) are pretty much obsolete. I'm sure there are some being used but not many. If you had one, I guess is could be another safety net; on top of fuel cut and watching your boost gauge. I've had both of those fail me though.....hit 16-17psi in 4th once when it was like 30 F out, stock turbo and AFM. :eek:
 
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No melloboy....Boostedstr8six hit it on the head.
 

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Dr. Jeff Lange
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9,352 Posts
The 300ZX Z31's have a safety POV mounted directly at the opposite end of the intake manifold. Sounds like a good safety feature to me.
 
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As a safety feature...yes. As a way of controlling boost...no.
 

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Dr. Jeff Lange
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yeah, definitely not as a way of controlling boost, that's what the wastegate is for :).
 
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Is it fully adjustable? I didnt know they made em....

I dont need it though...I have FC to protect me :D
 

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Dr. Jeff Lange
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9,352 Posts
Actually, yes, the HKS POV looks pretty cool, I've seen a few on some Z31's over at 300zxclub.com.
 

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Moderator, l337 M0d3r4t0r
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12,328 Posts
Why would you want to work the turbo so hard making it create all the heat less efficent and then release half the air...

How bout just keeping the wastegate and a proper boost controller to control the boost to say 12 psi so that the air charge is cooler then it would be at say 25 psi since the turbo cannot release via wastegate....

As someone said wasted energy
 
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