Speed3Rookie
Member
Is this a good thing?
Forge BPV installed, lost boost pressure??? HALP!
- Thread starter serialtoon
- Start date
No.
The reason for the BPV is to let the turbo keep spinning after you let off the throttle. Then it is still spinning when you get back into it and you get boost sooner.
Speed3Rookie
Member
So in essence one should run the spring with just enough pressure to hold boost?
Correct.
Sorry but incorrect. If you're able to shift quick enough you hold boost better while the lighter spring dumps your boost. You put the yellow in and I'll run the blue and we'll see who pulls on who.
Speed3Rookie
Member
Yes...you will hold boost longer during the shift at the expense of damaging the turbo over the long haul.
That pressure you're holding during the shift puts pressure on the turbine.
Sorry but incorrect. Dumping the boost is a good thing because the turbo is still pumping air and when the throttle is opened and the BPV closes, you already have air moving. If the BPV stays closed, your boost pressure may stay up, but there is no air moving and the turbo stalls out. When the throttle opens, the boost will drop waiting for the turbo to start spinning again.
AutoEuphoria
Member
- :
- '08 CPW Mazdaspeed 3
Could be due to the colder weather, too...from what I read, the ECU cuts the boost down when the air gets colder (more dense)
(spank)(butt)
sounds like a fluttering, i have heard they are happy sounds for a valve in recirculation. My valve sounds similar at partial throttle when i am letting up a bit. Also your Valve may be in heat and looking for a mate. I have a Forge black, if you have an HKS for stud let me know!
serialtoon
Member
- :
- 2008 Mazdaspeed 3
I had to bring this outta the trash, but im still not holding as much boost as i can remember....but i have a feeling my boost gauge is going out. It seems like i start spooling 3 notches before 0 Vac...so -3Vac and im already building boost. Those 3 notches are exactly what is missing when im at boost. I see 13 psi one day and 14 psi the next. Pro sport is cheap for a reason..anyone else care to elaborate?
Renzokuken
Member
- :
- 2007 Mazdaspeed 3
Im tellin you it cant be the Forge cause I tested the hell out of it before I sold it to you. I know for sure it was working properly cause once I put the stocker on, I lost boost. Lame. do you have the amber white electronic gauge, cause thats the one i had. Mine started ready all retarted after a while, and I had to replace it. see if anyone near you has a Dashhawk and borrow it for a quick run. Also, change the yellow spring to the blue spring. the yellow is too soft.
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serialtoon
Member
- :
- 2008 Mazdaspeed 3
Ummm....i lost the blue spring (nervous) I dont even wanna get into how that happen, but im running the yellow with 2 shims as a blue replacement. All i remember is that it didnt matter what spring i used, so im sure its not the Forge, but im planning on buying a replacement set of springs. I have the amber mechanical gauge and i seriously think its that. I have check all connections to the turbo, intercooler, and even cleaned the MAF and intake filter (Cobb SRI). Which btw, today i saw the stupid bracket broke. So its there somewhat moving around as i drive. Not sure what im going to do about that, but ill figure something out.
serialtoon
Member
- :
- 2008 Mazdaspeed 3
Yea, i wonder that since my intake is flapping around as i beat on my ms3, it probably cant retain correct air flow. Weak.Fook man I didn't want to hear about another Cobb bracket breaking
serialtoon
Member
- :
- 2008 Mazdaspeed 3
This is a little bit off topic on my own thread. I removed the battery cover to see where the broken piece was at. Once i noticed that the bracket had ripped the plastic off, i simply drilled a hole from the location of the "clip" that broke and used a self threading screw to mount it back on. Now i have an awesome connection from the bracket and the cobb sri without any movement from that piece. I should have done a How-To but it seems rather straight forward.
I have seen this phenomenon on my gauge. When it is really cold outside I loose almost 2 PSI due to ECU tuning.
