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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 
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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 89 944,85.5 944 914-6 2.4s GT tribute. 914-6werkshop.com |
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04-02-2007, 07:35 AM
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Quote:
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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87 930 K27HFS/B&B/Twin-Plug... Megasquirted
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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 89 944,85.5 944 914-6 2.4s GT tribute. 914-6werkshop.com |
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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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87 930 K27HFS/B&B/Twin-Plug... Megasquirted
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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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2014 Cayman S (track rat w/GT4 suspension) 1979 930 (475 rwhp at 0.95 bar) |
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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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87 930 K27HFS/B&B/Twin-Plug... Megasquirted
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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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2014 Cayman S (track rat w/GT4 suspension) 1979 930 (475 rwhp at 0.95 bar) |
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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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87 930 K27HFS/B&B/Twin-Plug... Megasquirted
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04-04-2007, 02:22 PM
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1979 Porsche 930 3.4
