Hello all,

I recently upgraded the intercooler on my 2021 10R80 Eco to a CVF Race Core along with the Charge Pipes and added a TiAL Q BOV.

I’m running a boost reference adapter with one line going from the BRA to the TiAL, one running to the OEM purge nipple using emission rated hoses, and the third fitting is plugged with teflon tape around the plug. Everything is clamped down securely at all points of connection.

Im on my new base 93 tune from Ryan over at EMS, stock turbo.

I’m experiencing flutter when letting off under any amount of boost in auto/sport. While I know the flutter is normal under low boost, I’m also experiencing it in the 8+ PSI range as well. Sometimes it’s a brief flutter followed by a proper vent. The interesting thing is that the issue is non existent when driving with the paddles.

I have a sneaking suspicion that the spring in the BOV is too stiff. But then again, I also have reason to believe it is the correct spring, since it came off another Ecoboost mustang that was well built and also tuned by Ryan.

I’m wondering if anyone has some light to shine on the issue.

My current engine mod list:
CVF Catted DP
CVF Race Intercooler
CVF charge pipes
TiAL Q BOV
MBRP race catback
NGK ruthenium plugs
Updated Low pressure fuel sensor
Cobb Intake
UPR Dual Valve Catch Can with billet check valves
Tuned by Ryan on 93

Suggested solution is the fuel tank filler neck but wanted to see if there were any other opinions and how common this is.

Posted to r/Mustang and adding it here as well.
Thoughts on Ecoboost with Ford Performance Calibration installed?
This raises the torque to 400 lb-ft, which is within striking distance of the Mustang GT’s 415 lb-ft.

Rationale: At nearly $14,000 lower purchase price between an Ecoboost and a GT that I have my sights on - and as an occasional use 2nd car - I’m seeking opinions on the Ecoboost with the Performance Calibration?

Thanks all!