Quote from: BoostfoSHO on December 04, 2017, 04:18:39 PM
Do you think I need to change the spring ? Is it common to change them if you're tuned?
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I never ran my car with the -10, I swapped to the -8 before I started, based on the recommendation I saw from ZSHO and another member or two at that time. Many people have been fine with the -10. You can use the chart I linked (
http://www.tialsport.com/documents/w3_tial_qqr_sp.pdf) to see your resting vacuum. Using your tuner you can get an idea of the vacuum value at idle, or if you have a boost gauge it is even easier. The main difference between the -10 and the -8 is the response of the BOV. The -10 is set for a slightly higher amount of vacuum so it opens slightly later. The -8 looks for slightly lower vacuum and opens quicker.
EDIT: You may actually want to get a straight 1/8" NPT to 1/4" hose barb for the port I mentioned. (something like this:
https://www.fastenal.com/products/details/69920)
Alternatively you can get an 1/8" NPT to 1/4" NPT straight fitting, with a coupler (female 1/4" on both sides), and then 1/4" NPT to hose barb with a 45 or 90 degree angle depending on how you feel about routing the hose. A 45 or 90 degree would have been easier for what I did, but it wouldnt clear the MAP sensor hence the need for the straight extension.