Finally consistant boost
10-24-2013, 09:36 AM
#1
Senior Member
Thread Starter
Join Date: 03-08-2012
Location: Elkton, MD
Posts: 104
Finally consistant boost
Just installed a Forge BPV (stock type) that I purchased through Bad News Racing last night. I did use the yellow spring instead of the green spring since I have the GMTU installed.
I will say the boost is more consistant now than with the stocker. Boost at WOT doesn't spike as hard either during the shift.
Previous issues I was fighting was the following...
Boost surging under load between 5 & 10 psi at cruising speeds when accelerating and the ocasional overboost code.
I will say the boost is more consistant now than with the stocker. Boost at WOT doesn't spike as hard either during the shift.
Previous issues I was fighting was the following...
Boost surging under load between 5 & 10 psi at cruising speeds when accelerating and the ocasional overboost code.
10-24-2013, 11:17 AM
#2
Senior Member
Join Date: 08-07-2011
Location: Montebello, CA
Posts: 553
Just installed a Forge BPV (stock type) that I purchased through Bad News Racing last night. I did use the yellow spring instead of the green spring since I have the GMTU installed.
I will say the boost is more consistant now than with the stocker. Boost at WOT doesn't spike as hard either during the shift.
Previous issues I was fighting was the following...
Boost surging under load between 5 & 10 psi at cruising speeds when accelerating and the ocasional overboost code.
I will say the boost is more consistant now than with the stocker. Boost at WOT doesn't spike as hard either during the shift.
Previous issues I was fighting was the following...
Boost surging under load between 5 & 10 psi at cruising speeds when accelerating and the ocasional overboost code.
10-24-2013, 12:18 PM
#3
Senior Member
Thread Starter
Join Date: 03-08-2012
Location: Elkton, MD
Posts: 104
I debated on installing the yellow spring for a few minutes while waiting for the engine to cool off before diving into the engine bay. Glad I did. I think the green spring is better suited for bone stock applications.
10-25-2013, 12:51 AM
#4
Senior Member
Join Date: 08-07-2011
Location: Montebello, CA
Posts: 553
10-27-2013, 02:12 PM
#7
Senior Member
Join Date: 08-07-2011
Location: Montebello, CA
Posts: 553
Yup big time, I have the GM tune, mine would go from 22 to 15 then back up, now Im at a constant 21 22. You can really feel the pull, amazing what a small little spring can do
11-11-2013, 01:21 AM
#9
Premium Member
Join Date: 10-09-2010
Location: Tacoma
Posts: 14,420
Forge makes 4 springs for the valve, the more boost you have the more spring you need to hold it closed. Mine hits 26 and the yellow spring leaks a touch, but the red one holds it fine. Each spring is 25% stiffer.....
11-11-2013, 11:05 AM
#10
Senior Member
Join Date: 08-07-2011
Location: Montebello, CA
Posts: 553
I have the GM tune mostly boost between 20 and 22. The green spring was too weak, psi would go up and down a lot. After I swapped out for the yellow spring everything was more constant. No codes or anything odd yet. Going on a few weeks now 
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