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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 12-14-2011, 05:05 AM   #1
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So running the GFB valve from FM and got the car driving again. Valve is VTA with a K&N filter on it. The Vacuum hose doesn't share with anything and is connected under the thottlebody. At idle the valve is open, ya. Going into boost swear I can hear the thing close. How do I describe this......Driving in cruise and smash the throttle down. The intake makes a noticable change in suction sound just after the gauge sweeps past 0psi. Almost like I can hear the motor trying to suck air in at the BOV and then transition over to the turbo intake. This normal? Never remember hearing this on my SR powered 240 running a greddy valve.

On top of this is I can hear the turbo "chirp"/"shudder"/"surge" just a little. Just 2-3 little chirps. Not after a higher boost let off (4psi plus ish) or just shifting in traffic. Only when I lightly pass someone. Like a quick throttle to 0psi ish then let off cause the dick cuts me off.

I know I can adjust the preload on the valve. Question is how do I know what is too soft and opening under boost? If I go too hard on preload it'll surge all the time probably/not react fast enough. Change intake mani fitting location? Also don't have an air compressor or pressure hand pump yet either. Really the surging sound just translates to turbo abuse in my head.
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Old 12-15-2011, 03:13 PM   #2
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The surging sound won't hurt anything, and if you are getting that sound, it means the valve is closed. It almost sounds like the valve is moving slowly and needs to be lubed or broken in.
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Old 12-15-2011, 06:44 PM   #3
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Yeah the valve just seems laggy. I did tear it completely apart, clean it, and lube it with some killer gun oil. I use the same stuff on my Glock and should be safe for the little teflon seal in it. Very little amount used FYI. I've been fixing little stuff from the previous owner. He never had the BOV even hooked to vac for a couple years

Any recommendations on a good vent to atmo BOV? The Forge valve seams to have disappeared online and I am not paying over $150 for a valve or buying knock off china stuff. Unless someone can vouch something specific.
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Old 12-15-2011, 07:14 PM   #4
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Synchronic. Occasionally you can buy them on sale straight from synapse for around $160.
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Old 12-16-2011, 12:55 AM   #5
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Quote:
Originally Posted by TorqueZombie View Post
Any recommendations on a good vent to atmo BOV? The Forge valve seams to have disappeared online and I am not paying over $150 for a valve or buying knock off china stuff. Unless someone can vouch something specific.
I'll sell u my forge for 80 bucks. VTA. Real valve bought from forge. Ran it for about 4 months.



I did drill out each other hole for more air.

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Old 12-16-2011, 01:45 AM   #6
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Synchronic. Occasionally you can buy them on sale straight from synapse for around $160.
Do this. Synchonic valves do not suck. Not even a little.

























Pun intended.
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Old 12-16-2011, 03:10 AM   #7
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Tial Q hands down best bov on the market IMO.
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Old 12-16-2011, 03:38 AM   #8
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Problem fixed.. ish. Little adjustment was needed. More curious on how to test if the BOV is adjusted to light and leaking under boost. More specifically how to test it without an air compressor.

Edit: Little interested in triple88's valve though
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Old 12-16-2011, 04:19 AM   #9
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I was getting some surge at low boosts, i added a thinner spring on the plastic inner valve. I'll toss the original spring in there with it. Theres 2 springs, one to hold the plastic one, another to hold the main valve.
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Old 12-16-2011, 09:50 AM   #10
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Quote:
Originally Posted by Asx View Post
Synchronic. Occasionally you can buy them on sale straight from synapse for around $160.
lol @ that Chinese ****. TiAL is the way with only a two piece case/shell, piston, o-ring, spring, diaphram, and nipple fittings. That's it.
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Tial Q hands down best bov on the market IMO.
Once I put the right spring in there, I've never looked back.
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I was getting some surge at low boosts, i added a thinner spring on the plastic inner valve. I'll toss the original spring in there with it. Theres 2 springs, one to hold the plastic one, another to hold the main valve.
Calling off-throttle chirpy BOV "surge" is like calling Steve Urkel a "power lifter". If there is no fiery pressure in the turbine, it's not "surge". Engineers may feel free to correct me, but I've running a fairly stiff spring in my BOV, have been for 3-years, and my turbonator looks fine with no play. Run a stiff enough spring to keep the valve closed in overrun, you should not hear the BOV open in vacuum.
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Old 12-16-2011, 01:00 PM   #11
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Quote:
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Run a stiff enough spring to keep the valve closed in overrun, you should not hear the BOV open in vacuum.
Yeah with the current spring i had a small leak from about 15 that goes away at 5 inhg. Never leaked in boost so i didnt bother with it. The original spring never had that leak though.
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Old 12-16-2011, 08:35 PM   #12
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Quote:
Also don't have an air compressor or pressure hand pump yet either. Really the surging sound just translates to turbo abuse in my head.
Or you could just not run a bov and have your head explode.
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Old 12-19-2011, 03:47 AM   #13
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I meant in my mind, not the head on the motor. Unless ^ was for funny, then haha
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Old 12-19-2011, 07:37 AM   #14
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Quote:
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I meant in my mind, not the head on the motor. Unless ^ was for funny, then haha
was for the funny, but I don't run a bov
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Old 12-19-2011, 12:46 PM   #15
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YA CHEAP BASTARD^.

Hows the tb to turbo compressor testing going btw?
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Old 12-19-2011, 12:59 PM   #16
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Little curious myself.
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Old 01-13-2012, 10:13 PM   #17
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are turbonetic raptors good bov?
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