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Question Weak BOV Spring = no boost ???

I have just replaced my GSF BOV with a Tial 50mm unit and now I don't have any boost

I haven't double checked to make sure I reconnected all the hoses 100% correctly, but I crossed my mind that since I specified a fairly weak spring (-9psi) for the BOV, could it be what causes the problem?

I thought if I keep my foot in, the BOV should NOT open even with a weak spring?

Any comments / suggestions?

Thanks!
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87 930 K27HFS/B&B/Twin-Plug... Megasquirted
Old 04-02-2007, 05:19 AM
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I choose the same spring for my setup and it works perfect. Can you here it expelling? If not recheck your IC connections.
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Ben

Current project 73 914-6 Gt project rusteration 2.4
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Old 04-02-2007, 07:35 AM
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Quote:
Originally posted by mb911
I choose the same spring for my setup and it works perfect. Can you here it expelling? If not recheck your IC connections.
On throttle lift (from cruising to total lift), I can hear it vent faintly. So I assume its opening properly.

Could it be that it is opening too soon/too much while I try to build boost?

I'll definitely check the IC, & intake tract connections tonight but thought I'll jump the gun & ask for input about choosing wrong BOV spring tension...
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Old 04-02-2007, 07:41 AM
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interesting I only am building .4 bar and it works great for me!
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Ben

Current project 73 914-6 Gt project rusteration 2.4
Reproduction 914-6 oil tanks, 1-5/8" 914-6 heat exchangers source call 2623647426 or email mbconsulting21 @gmail.com
Old 04-02-2007, 01:52 PM
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As Ben suspected, I re-checked my IC connection and one of the hose slid off just a tad causing boost leak.

Didn't have a chance to really gun it but the one short chance I have, boost is shooting up to 0.6 bar already very quickly. Looks like I have solved the problem
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Old 04-03-2007, 09:09 AM
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I guess my 50mm Tial has the stock spring, whatever that is. When it was on the dyno, I noticed it opening when the throttle was closed even at very low loads. I never saw it open under boost.
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Old 04-03-2007, 10:14 AM
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David, when I still had boost leak, I could hear a nice "faint" whoosh as I lift throttle from cruise.

Now, there's a fairly loud rumbling when I lift - sound more like turbulence kinda rumbling. To be honest, not a very pleasant sound; though my old one did the same.

Do you guys have similar experience?
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Old 04-04-2007, 04:25 AM
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Mine made a slight woosh when lifting at low loads and the louder woosh when lifting at full boost. I don't recall a rumbling sound.
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Old 04-04-2007, 04:52 AM
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umm... maybe I should try to record the sound and upload it.
Mine does sound quite violent. The location is very similar to where the standard one is (between turbo & the intercooler input).
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Old 04-04-2007, 02:22 PM
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