AutoEuphoria
Member
- :
- '08 CPW Mazdaspeed 3
OK,
After dealing with this:
http://www.mazdas247.com/forum/showthread.php?t=123755510
I changed back to the stock BPV and went on another test run. Same location, same gear (3rd). Seemed to be a little better, but not much. Here is the new datalog:
So...
- Boost is still down to basically nothing before 5000RPM (yes, that is 0.73 psi at 4918 RPM)
- Fuel pressure is still down
- Wastegate seems to be closed while boost is going down...boost leak?
- AFR still seems to be safe
So I am thinking I have a major boost leak somewhere. Would this be safe to assume considering the wastegate is closed (0%) as boost is dropping? Where would a boost leak like this even come from? Also I noticed the boost was jumping all over the place as it was loosing pressure...it would bounce around 10, then around 5.
Another quick question...I just wanted to make sure of a couple of things regarding the stock turbo system vacuum lines.
Question 1:
Is there anything special about any of the lines in the turbo vacuum system (between turbo and WG, WG and BCS, BCS and intake)? Any unique sizes or restrictor pills or anything? I replaced the stock vacuum lines when I had the MBC, and put just regular line in when I took the MBC out.
Question 2:
Is this the correct order for the vacuum lines?
Turbo to bottom of wastegate actuator
Top of wastegate actuator to nipple on boost control solenoid closest to the front of the car
Nipple on boost control solenoid closest to the rear of the car to the intake
Thank you for any help!
After dealing with this:
http://www.mazdas247.com/forum/showthread.php?t=123755510
I changed back to the stock BPV and went on another test run. Same location, same gear (3rd). Seemed to be a little better, but not much. Here is the new datalog:

So...
- Boost is still down to basically nothing before 5000RPM (yes, that is 0.73 psi at 4918 RPM)
- Fuel pressure is still down
- Wastegate seems to be closed while boost is going down...boost leak?
- AFR still seems to be safe
So I am thinking I have a major boost leak somewhere. Would this be safe to assume considering the wastegate is closed (0%) as boost is dropping? Where would a boost leak like this even come from? Also I noticed the boost was jumping all over the place as it was loosing pressure...it would bounce around 10, then around 5.
Another quick question...I just wanted to make sure of a couple of things regarding the stock turbo system vacuum lines.
Question 1:
Is there anything special about any of the lines in the turbo vacuum system (between turbo and WG, WG and BCS, BCS and intake)? Any unique sizes or restrictor pills or anything? I replaced the stock vacuum lines when I had the MBC, and put just regular line in when I took the MBC out.
Question 2:
Is this the correct order for the vacuum lines?
Turbo to bottom of wastegate actuator
Top of wastegate actuator to nipple on boost control solenoid closest to the front of the car
Nipple on boost control solenoid closest to the rear of the car to the intake
Thank you for any help!