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??


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I use yellow spring but its a v2 not v1

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

Quote:

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Originally Posted by allo80

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

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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??

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

Quote:

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Originally Posted by gurusev

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!!

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Underneath the piston

Mazdaspeed Forums

Quote:

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Originally Posted by DarkSoul

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

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Lol.. You may have to.

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Quote:

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Originally Posted by allo80

Underneath the piston

Mazdaspeed Forums

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That's for v2 I think..

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