Nothing to disagree about. The stocker is a piece of plastic. Some hold boost fine while others leak practically brand new. Nothing wrong with the valve but it is plastic (cheaper) and may leak. I installed a forge on my practically brand new car and i held 2 psi higher consistantly. Some stockers are fine and others leak but its obvious that most aftermarket bpv's are superior quality and won't leak.
i don't know how to post datalogs.... i've tried many times. I don't have money for retune and taking it back to 17psi, but what about using a manual one to force it to 17psi?
With respect, you need to solve your problem first. Using a different bandaid to stop the bleeding does not fix the reason you are bleeding (pun intended).
I'd be scared as hell to go to a MBC not knowing why I have a problem. Identify it and fix it, then if you want to run an MBC, that's cool.
Locate the leak. Check all connections carefully - tubes and hoses.
Somebody help him again on how to upload his datalogs.
With respect, you need to solve your problem first. Using a different bandaid to stop the bleeding does not fix the reason you are bleeding (pun intended).
I'd be scared as hell to go to a MBC not knowing why I have a problem. Identify it and fix it, then if you want to run an MBC, that's cool.
Locate the leak. Check all connections carefully - tubes and hoses.
Somebody help him again on how to upload his datalogs.
With respect, you need to solve your problem first. Using a different bandaid to stop the bleeding does not fix the reason you are bleeding (pun intended).
I'd be scared as hell to go to a MBC not knowing why I have a problem. Identify it and fix it, then if you want to run an MBC, that's cool.
Locate the leak. Check all connections carefully - tubes and hoses.
Somebody help him again on how to upload his datalogs.
the factory system isn't really an electronic control it's just vacuum/bleed control system with a simple solenoid
can i get your email to email you datalog? It would really help me out
Respectfully disagree. I'm running stock BPV with catless DP/RP and CAI for more than a year and it holds boost beautifully. But if I were to consider an aftermarket BPV, it would be the Turbosmart pure BPV. I am on stock tune and not trying to push boost above stock level, though. If I can hit 0-100 mph in 11.5 seconds and run the quarter in 13.4 -13.5 (which I do), I have no reason to go around crapping on stock BPV's.
Cpolly's advice to OP is right on target, though, especially taking boost back to about 17 psi. Look for boost leak somewhere. Post the datalogs. I don't think this has anything to do with the turbo mechanically.
Wrong.
The boost control is a closed loop system controlled by the ECU (which is no different than any other electronic boost control).
To the OP:
So far, no one has mentioned the obvious:
Can you monitor the WG duty at WOT?
That will tell you where the boost is relative to where the ECU wants it to be.
It is the best way to check for a leak or other problem.
when mines done ill run high to mid 12's all day on stock turbo. =]
Well, let us know when you actually complete those "when mines done," mods so we can talk facts.
If the BPV is not leaking (mine is not), changing to another one is not going to make any more power. Period. Other "when mines done" mods are not the issue here.
So, if I replace a non-leaking stock BPV with an aftermarket BPV, how is that going to make more power? I'm holding 15-16 psi now on stock tune. I don't see how another BPV will change that. Explain, please.
Just as an aside, do you plan to run those mid 12 second runs on the stock tires? That's the limitation now - traction, not power. Guys with only intake mods and otherwise stock are in the 12's on DOT drag radials. That's a completely different discussion, IMHO.
Returning to the issue of trying to help the OP, can someone PM him with help on posting his logs?
ok guy, 1 if u go 2 a track on street tires and ur not awd ur a ****** idiot, 2 agian anything is better than that plastic valve, if you only runnin 15lbs u wont have a problem, but for those of us who are really moding and want power arent going to leave that stock valve on when were runnin 18-20psi. y dont you buy a nother valve and find out what it will really do, instaed of asuming it wont do anything,, im tellin u i went from the forge to stock and the car felt alot slower, thats my expeirence with it, dont seem like u have any with other valves so how can you tell ppl it wont do anything if you dont rlly no if it wil or not?
So i'm tuned at 18psi and when I go WOT in 3rd gear at 40mph my boost spikes at 20psi and instantly goes down to 16psi then to 15psi then back up to 16psi then back to 15psi and so on all the way to redline and does same thing in 4th. Car feels like it is getting slower and slower. After about 75mph right when i go into 4th there is a huge loss of power... I go from 40-75mph faster than 75mph to 85mph. Way faster. Any ideas? I have 0 knock, afrs are holding right around 12 the entire time, and while spraying co2 on stock tmic- boost air temp through 3rd gear starting at 115degrees goes down to 107 by redline and 4th gear starting at 115 goes up to 135(I know temperature is rising but 135degrees still isn't that hot... maybe the turbo is just blowing really hot air by that time making me think turbo could be going out)
I'm a scientific method sort of guy. I go by data, not assumptions. My boost gauge is briefly spiking at 18-19 and settling back down at 16. My drag strip performance and accelerometer data logging tell me what power I'm generating and where. This is where I want it to be. If it ain't leaking at my boost level, some other valve is not going to improve my performance. I'm not looking to overboost and pop. I hope that is clear.
I guess there are a lot of us idiots out there at the strip or autox'ing on street tires of one sort or another. All of us idiots, every single one.
Will my BPV leak if I run a sustained 20 psi boost on stock internals? I think that would be the last of my worries.
Now, what can we do to help Jdizzle659 with his problem?
bpv's affect performance - but they only effect it positively if you do them correctly - if you want some science to explain how here you go just take out the slashes
link removed
here's a dyno video of a bov and it's performance gain that's not that popular with the car but i believe is one of the best out there because it's of a different design -
http://video.google.com/videosearch...b=0&aq=f#hl=en&emb=0&q=mazdaspeed3+synchronic
I'm a scientific method sort of guy. My drag strip performance and accelerometer data logging tell me what power I'm generating and where.
All of us idiots, every single one.
Now, what can we do to help Jdizzle659 with his problem?
rather than try to get around the rules with links like that, why not just share the info or cut and paste. You can still give credit where credit is due, but don't link to other mazda forums.
