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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 06-08-2016, 07:42 AM   #21
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You will not build boost in neutral.
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Old 06-08-2016, 09:28 AM   #22
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You dont make boost any time the turbo is spinning.

when engine under load, then you have much more exhaust gas going to the turbo and spinning to turbo MUCH faster than simply revving in neutral or coasting. thus creating boost.

dont think that because you have a turbo then you are now always in boost since the turbo is spinning.
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Old 06-08-2016, 10:18 AM   #23
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Hey I just read on the web, that you won't make boost in neutral.
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Old 06-08-2016, 10:22 AM   #24
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and here I thought this thread couldn't possibly get any more moronic
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Old 06-08-2016, 01:09 PM   #25
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Old 06-08-2016, 02:27 PM   #26
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But then how does stuff like this happen? For the BOV to open, that means there was pressure, and thus, boost was built, no?
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Old 06-08-2016, 02:41 PM   #27
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Quote:
Originally Posted by Wingman703 View Post
But then how does stuff like this happen? For the BOV to open, that means there was pressure, and thus, boost was built, no?
blow off valve duck call - YouTube
Because the BOV is vac driven and not pressure driven. You don't turbo much do you.
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Old 06-08-2016, 02:44 PM   #28
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"whoosh" doesn't automatically mean "boost"
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Old 06-08-2016, 02:53 PM   #29
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"whoosh" doesn't automatically mean "boost"
I'm living a lie :(
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Old 06-08-2016, 02:55 PM   #30
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Don't worry, so is OP
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Old 06-08-2016, 03:52 PM   #31
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not to derail this thread off topic, but since we are talking about BOV's....

I have an HKS vent to atmosphere bov, so if i understand this correctly the valve is always open in VAC and closes in boost.

so basically the engine is sucking in non filtered air and potential debris through the bov? unless i have a recirculating bov?
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Old 06-08-2016, 04:07 PM   #32
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Quote:
Originally Posted by borka View Post
not to derail this thread off topic, but since we are talking about BOV's....

I have an HKS vent to atmosphere bov, so if i understand this correctly the valve is always open in VAC and closes in boost.

so basically the engine is sucking in non filtered air and potential debris through the bov? unless i have a recirculating bov?
Yes, but you should adjust the preload so that its only open on high vaccum and stays closed on idle.
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Old 06-08-2016, 04:27 PM   #33
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I've honestly not seen many people actually get stuff inhaled into engine through a bov. Esp if it's high up and not near the belly or something.

But yeah, if you're worried about it, some people install little filters onto bov's

I imagine you'd have to be off roading or doing something pretty drastic to get that much stuff flying around in the engine bay
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Old 06-08-2016, 04:32 PM   #34
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Quote:
Originally Posted by borka View Post
not to derail this thread off topic, but since we are talking about BOV's....

I have an HKS vent to atmosphere bov, so if i understand this correctly the valve is always open in VAC and closes in boost.

so basically the engine is sucking in non filtered air and potential debris through the bov? unless i have a recirculating bov?
Not exactly, as long as the spring is set up correctly on the BOV. There is pre-load on the BOV that prevents it from sucking in air.

(I was going to draw something but I don't have the time)

Last edited by Chiburbian; 06-08-2016 at 04:45 PM.
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Old 06-08-2016, 04:52 PM   #35
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Thanks for the replies.

I dont think my BOV is adjustable, i dont see any adjustment screws or nuts on it, so i might just throw a little filter on it.

im not worried about debris, but more so little sand particles that i find all over my engine bay from florida driving.

my bov is right under the 90 degree bend coming off the throttle body

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Old 06-08-2016, 05:19 PM   #36
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Spring 'should' be keeping it closed... could always place your hand in front of it at idle

I picked up a greddy fv to prevent this, made a huge difference with MAF control on my xede.
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Old 06-09-2016, 12:28 AM   #37
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So I have a question about the idle speed control valve. Do I run that into the intercooler piping before or after the turbo? I have it right before the throttle body right now but I was just curious if I needed to run it somewhere where there would be a negative pressure.

The original BOV I bought wouldn't open at all. I did many tests and even tried to push it in with my finger, oh well it was $15.

The new TurboXS BOV I got sounds amazing and works great, the guy I bought it from had one just like this one and sold me this one because he didn't like the color haha

I went ahead and took the car out today to see if the problem had went away. I took all the intercooler piping back off and made sure that all the connections were secure and then reassembled the piping. The car still isn't producing any power. Even at 4k, which I would think the turbo would be producing some kind of power, the boost gauge doesn't even move past 0. If I really get on the throttle the boost gauge will go to about 1 psi but then will drop which leads me to believe there is still a boost leak. I did get the intercooler used so im going to check tomorrow to see if there is any visible signs of a hole or something. Any thoughts?
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Old 06-09-2016, 07:31 AM   #38
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Take the pipe off the turbo oitlet, start the engine and verify that the turbo is spinning. Then disconnect your wastegate diaphragm and actuator arm, and wire the gate closed. Be certain you know what way is open and what way is closed.
Have you pulled the oil drain tube and verified with the engine running, that the turbo is getting and passing oil?
did you ever take the intake manifold off? If so, did it get the correct gasket? Is it sealing properly?

There isn't a lot to this mystery. Chase down every Avenue. It's just a fancy air compressor,
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Old 06-09-2016, 08:04 AM   #39
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Do you have an adjustable wastegate actuator? Is the wastegate preloaded right? Is the wastegate door completely shut with some preload? Get some photos of your whole setup; turbo, piping, bov, etc...

You connect your iac to the same pipe that connects to the throttle body.
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Old 06-09-2016, 08:44 AM   #40
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Please post pictures of engine bay, charge pipes, and intercooler.

Specific attention to turbo with various angles, intake manifold with various angles.
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