Not sure what BOV spring to get....... - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 4 Old 12-04-2007, 12:41 PM Thread Starter
 
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Not sure what BOV spring to get.......

I've been stumped a bit over this one. My question is this, my engine vacuum hangs in the 17/18" range at idle.

From Tial:
-18 and -21 in/Hg Un-painted -11 Psi (-22 in/Hg )
- 14 and -17 in/Hg White -9 Psi (-18 in/Hg )

So my vacuum sits right in the upper end of the 9psi spring, and the lower range of the 11 psi spring, which do I get? If I go with the 9 psi spring, won't the BOV be cracked open a little some times (sucking unfiltered air in the engine)? Or if I go with the 11 psi spring, won't the valve open a little late after letting off the throttle?

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post #2 of 4 Old 12-10-2007, 11:36 AM Thread Starter
 
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No one has ever had a turbocharged car and had an engine vacuum right in between two spring ratings and had to decide on which one?

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post #3 of 4 Old 12-23-2007, 10:29 PM
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Go with the 11lb... We have the same problem... Works fast

1991 lx turbo notch
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post #4 of 4 Old 12-28-2007, 01:09 PM
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I used a mity vac vacuum pump and tested mine on the bench. The spring in mine was opening waaaay late for what it was advertised so I ended up cutting a few coils off of mine. Its just barely hanging open at 17hg---and if you have a blow through that is metered air you are sucking in--its just unfiltered

73 CJ5 408W, 4sp Toploader, 9" locked up front and rear

03' MG Cobra, 2.9 whipple, T56 Magnum, Mcleod RXT, 591/540
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