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Thread: Which springs/shims to use - forge bpv v1

  1. #1

    Default Which springs/shims to use - forge bpv v1

    Hi guys
    Installed forge last night. Everything went well except me snaping off the bpv bolts whilst tightening it. WHAT A PAIN!

    Anyways took the car for a run today with blue spring installed however I noticed that it was fluttering too much at boost, so changed it to yellow springs based on @DarkSoul suggestion.

    I again took it for a ride and did a wot run hitting about 110 in third gear. According to ap, I was only hitting 9.8 boost at 5k rpm.. I am assuming there is a leak somewhere or does it just looks fine? Another thing I noticed that it took a while to build up boost aswell.

    So long story short, what's the combination to use??


    TAP DAT!!



  2. #2
    Join Date
    Aug 2011
    Location
    Sydney North
    Posts
    441

    Default

    I use yellow spring but its a v2 not v1

  3. Default

    i use yellow and 2 shims... was getting flutter using blue (im using v2)

  4. #4

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    Quote Originally Posted by allo80 View Post
    i use yellow and 2 shims... was getting flutter using blue (im using v2)
    I'm in the same boat, it's flutters with blue but with yellow I suspect it's not correctly holding the pressure. May try yellow with 2 shims.

    Noob question: do you place shims on top of the spring or beneath where it sits tightly near the exit??

    TAP DAT!!



  5. Default

    Don't think it matters, but if you get stuck ill have a look at it

  6. Default

    Quote Originally Posted by gurusev View Post
    I'm in the same boat, it's flutters with blue but with yellow I suspect it's not correctly holding the pressure. May try yellow with 2 shims.

    Noob question: do you place shims on top of the spring or beneath where it sits tightly near the exit??

    TAP DAT!!
    Underneath the piston

    Mazdaspeed Forums

  7. #7

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    Quote Originally Posted by DarkSoul View Post
    Don't think it matters, but if you get stuck ill have a look at it
    Lol.. You may have to.

    TAP DAT!!

  8. #8

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    Quote Originally Posted by allo80 View Post
    Underneath the piston

    Mazdaspeed Forums
    That's for v2 I think..

    TAP DAT!!



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