Engine/Power - EJ25T (STI and 2006+ WRX) Discussions about the USDM 2006+ WRX and WRX STi 2.5 liter turbo flat-four.

Forge Bpv Question

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Old 03-09-2007 | 06:01 PM
  #1  
suba-rulez's Avatar
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From: miramar, fl
Car Info: 2005 apen white sti
Forge Bpv Question

What Spring Should I Have In It. Im Finally Going To Get The Fpred. I Have A Red Spring, Blue Spring And Yellow Spring. I Belive The Yellow Is The Heaviest. The Red The Lightest.
Old 03-09-2007 | 07:51 PM
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Originally Posted by suba-rulez
What Spring Should I Have In It. Im Finally Going To Get The Fpred. I Have A Red Spring, Blue Spring And Yellow Spring. I Belive The Yellow Is The Heaviest. The Red The Lightest.
Can all the noobies please stop beginning every word with a capital letter.
Old 03-15-2007 | 09:18 AM
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patty AT forge's Avatar
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You kind of have it backwards, the springs are rated as follows:

Green 5-15
Yellow 15-23
Blue 23-30
Red 30+

Sometimes it helps to go with the next stiffer spring on MAF cars with atmospheric valves.
Old 03-20-2007 | 10:10 AM
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Weakness's Avatar
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Originally Posted by patty AT forge
Sometimes it helps to go with the next stiffer spring on MAF cars with atmospheric valves.
Those numbers are 100% ... there are 2 shims inside the box so if you are a tweener of levels (16psi or so) you MAY need to use one of those since you will not be on 100% boost all the time.
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