Just a quick question... My car sits around 16-18 in/hg vacuum right now and I was planning on swapping over to a fp red, ets 3.5 fmic kit, and a tail bov. Will the vacuum still read the same as the motor will remain the same. I feel this is a stupid question.

 

The spring you choose really depends on the cams you will be using.

What cams will you be running?

EDIT-
FWIW, I am using GSC S3's and using the -10 PSI spring. Seems most people use that spring.


-Bink

 

weird, i run the S2's and run the 11psi spring. my gauge sits at 20in/hg vac. the spring depends on the vac reading you are getting. i doubt your vacuum will change much/ if any at all.

 

sounde the hkss good I have the hks 272s and the 10 psi spring was what looked about right.

 

10 psi spring worked well for my setup, stock block, S2 cams, BBK-B turbo, MAP V3 intake mani...11psi was too stiff & 8 psi too soft...

 

run the -10 with a dedicated 1/4" ID line