BOV spring sellection
07-11-2007, 02:26 PM
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BOV spring sellection ok can someone please tell me which spring I should go with in my BOV? I will be running 12+ PSI and I am at sea level and am running a 225 225 .581 .581 113+2 cam. if that helps. my current spring is 9 LB but I just ordered an 11 LB which of the two should I use and why ? thanks for any help you can give me. ~Guy
07-12-2007, 01:17 PM
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it depends on how much vaccum ur engine is pulling at idle.... if you have a boost guage, how much vaccum does it have... if its around 20-22(?stock?) then use the 11lb spring... if its less than that, use the 9lb spring....
i'm not 100% on those vaccum #'s... been a long time since i looked this up for my project
i'm not 100% on those vaccum #'s... been a long time since i looked this up for my project
07-12-2007, 10:42 PM
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thank you, I am seeing about 11 PSI of vacuum with my setup so I guess I should stick with the 9 I have in now. I am told I have such low vacuum because of the cam. thanks again for the help. ~Guy
07-13-2007, 05:11 AM
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yea, the cam will lower the vaccum..... i'd look into getting even a 7 psi spring if your vacuum is that low
-10 to -13 in/HG use 7 PSI Spring
-14 to -17 in/HG use 9 PSI Spring
-18 to -21 in/HG use 11 PSI Spring
-22 to -23 in/HG use 12 PSI Spring
-14 to -17 in/HG use 9 PSI Spring
-18 to -21 in/HG use 11 PSI Spring
-22 to -23 in/HG use 12 PSI Spring
07-13-2007, 02:13 PM
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well at idle its 11 on decelleration I am seeing the normal 18 - 20 PSI of vacuum if that makes sense. that quote helps a lot though thank you for that. ~Guy