boost sag question
#1
Junior Member
Thread Starter
iTrader: (6)
Join Date: Mar 2009
Location: In my RV
Posts: 140
Total Cats: 5
boost sag question
I have a boost sag problem. Boost is stable up to ~5500rpm. Then it steadily drops from ~12psi to ~9psi from 5500rpm to redline.
Hallman MBC is sourced just prior to TB.
Full 3” exhaust with high flow cat
Stock intake
Bell cast manifold and DP
Garrett 2554 with 6psi actuator
Is this turbo just too small to keep boost up at the higher rpms?
Or is the wastegate being pushed open?
Do I need a helper spring or could it be something else?
Thanks
Hallman MBC is sourced just prior to TB.
Full 3” exhaust with high flow cat
Stock intake
Bell cast manifold and DP
Garrett 2554 with 6psi actuator
Is this turbo just too small to keep boost up at the higher rpms?
Or is the wastegate being pushed open?
Do I need a helper spring or could it be something else?
Thanks
#3
Junior Member
Thread Starter
iTrader: (6)
Join Date: Mar 2009
Location: In my RV
Posts: 140
Total Cats: 5
yeah, and it was way rich at high RPM in this log. duty went down as we leaned out the high rpm cells in subsequent pulls. I used this pull because it most clearly depicts my boost sag condition.
Thread
Thread Starter
Forum
Replies
Last Post
StratoBlue1109
Miata parts for sale/trade
21
09-30-2018 01:09 PM