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well, that's pretty obvious to me.... 2 things... Posted by nicknick [Email] ![]() ![]() In Reply to: Don't have a pic on hand but ..., NOSNAAB, Thu, 24 Apr 2008 21:47:36 Members do not see ads below this line. - Help Keep This Site Online - Signup |
vac line should not allow air to pass through bpv-otherwise you get a leak. let me just grab one and do a test for you-
a vvack-style pause...(sorry vvack, just filling in for you!)
nope-vac line at bpv should hold a vacuum/pressure and you will here (quietly)the valve opening/closing.
blowing through the 1" hose on this old looking unit i have here allows practically no air to pass, i think any air passing is just a bad seat in my example-it offered lots of resistance, but was not absolutely 100% sealed. pretty sure it should resist air pressure there....
2)as i mentioned to you directly on this subject, the saab lh 2.4 system (lh2.2 also) cannot deal with a bov (atmospheric dump valve) as air is metered by amm, not a maf at manifold. this means that the original (100% functioning....)bpv set-up returns excess post-turbo pressure upon butterfly-closing back into the inlet of the turbo, thus keeping that metered air in the system.
a dump valve 'looses' that air, the car has already offered the fuel for it, you run rich for a second, and stall!
that's why C900's CANNOT run a dump valve, and we cannot get that phssst!
unless you want a stalling motor everytime you come off boost, that is...
So, faulty bpv is opening (or never really being shut) and allowing boost to escape, AND addition of BOV is allowing metered air to escape.
presto! problem solved....
going to bed now.
posted by 75.216.59...
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