dadasracecar
Member
Are any of you guys seeing boost creep? We are after having done the FullControl Flash to open the throttle plate. Here's a post I made in the P3 thread but I thought it needed it's own separate thread.
Well so what we have fellas is an improperly designed exhaust housing/wastegate from ATP. I set Brian's car to 18 psi and played around with the PID parameters to get the boost dialed but we kept seeing creep in his car. I datalogged everything with the standback so that we could be sure and here is the data:
The WGopt term is the wastegate solenoid. When it goes to zero, it is opening the wastegate 100% to bleed exhaust off to keep boost in check. You can see that at around 5900 rpm this term zeros out and boost creeps upward of 22 psi. As was stated before, ATP did not have access to the flash and their throttle was closing well before this so they would have had no reason to reach the upper rpms. Brian has a sub 10 psi wastegate actuator spring and his actuator arm is elongated as much as possible to allow full opening of the wastegate. At this point we can try porting the wastegate to allow more exhaust flow out of it or weld it shut and fab up an external gate. For now he'll be safe below 6K but ATP should significantly redesign their wastegate opening.
This is the email I sent to ATP. I suggest that people send similar emails to them to get them to address an inadequate WG design that shows up in the higher rpms.
Hello, I am an owner of P3 Performance, LLC. We are a install/tuning shop affiliated with Custom Performance Engineering in Maryland. We have installed two of your turbos on Mazdaspeed6s - one was a 3071, the other a 2871. We've seen boost creep on both cars. We tested the wastegate spring on the 2871 and it was sub 10psi and we elongated the actuator arm to ensure full WG opening. The turbo was installed with a 0.046" restricted pressure source tapped into the compressor housing so that that the factory WG solenoid could control boost. We are using cp-e's Standback to control the boost and have been datalogging runs. I have the files and can email them. What we see is that at rpms greater than 5900, the wastegate solenoid goes to zero holding the wastegate open completely. Boost setting was 18 psi and holding perfectly until 5900 at which time it creeps to above 22 psi before 6300 rpm. The same scenario occurs with the 3071. You may not be aware of a throttle plate flash developed by cp-e that keeps the throttle plate from closing at 5500 rpm. I believe that this TP flash has unearthed a problem with your exhaust housing/WG design that will be problematic as more customers purchase your turbo and start holding their cars at WOT to higher rpms.
I need a suggestion from you about how to deal with this creep situation as I don't want my customers blowing their motors.[/quote]
Well so what we have fellas is an improperly designed exhaust housing/wastegate from ATP. I set Brian's car to 18 psi and played around with the PID parameters to get the boost dialed but we kept seeing creep in his car. I datalogged everything with the standback so that we could be sure and here is the data:
The WGopt term is the wastegate solenoid. When it goes to zero, it is opening the wastegate 100% to bleed exhaust off to keep boost in check. You can see that at around 5900 rpm this term zeros out and boost creeps upward of 22 psi. As was stated before, ATP did not have access to the flash and their throttle was closing well before this so they would have had no reason to reach the upper rpms. Brian has a sub 10 psi wastegate actuator spring and his actuator arm is elongated as much as possible to allow full opening of the wastegate. At this point we can try porting the wastegate to allow more exhaust flow out of it or weld it shut and fab up an external gate. For now he'll be safe below 6K but ATP should significantly redesign their wastegate opening.
This is the email I sent to ATP. I suggest that people send similar emails to them to get them to address an inadequate WG design that shows up in the higher rpms.
Hello, I am an owner of P3 Performance, LLC. We are a install/tuning shop affiliated with Custom Performance Engineering in Maryland. We have installed two of your turbos on Mazdaspeed6s - one was a 3071, the other a 2871. We've seen boost creep on both cars. We tested the wastegate spring on the 2871 and it was sub 10psi and we elongated the actuator arm to ensure full WG opening. The turbo was installed with a 0.046" restricted pressure source tapped into the compressor housing so that that the factory WG solenoid could control boost. We are using cp-e's Standback to control the boost and have been datalogging runs. I have the files and can email them. What we see is that at rpms greater than 5900, the wastegate solenoid goes to zero holding the wastegate open completely. Boost setting was 18 psi and holding perfectly until 5900 at which time it creeps to above 22 psi before 6300 rpm. The same scenario occurs with the 3071. You may not be aware of a throttle plate flash developed by cp-e that keeps the throttle plate from closing at 5500 rpm. I believe that this TP flash has unearthed a problem with your exhaust housing/WG design that will be problematic as more customers purchase your turbo and start holding their cars at WOT to higher rpms.
I need a suggestion from you about how to deal with this creep situation as I don't want my customers blowing their motors.[/quote]
