TYPE OF STUTTER/STUMBLE
A consistent stutter/stubmle (loss of power) while accelerating or cruising through/at 2500-3000RPM.
MODS
Intake: KSTech 73mm CAI
Exhaust:Killer B ELH, Invidia 3" DP, Nameless Performance CBE
Fuel: 93 oct, DW 65c, ID Topfeed 1000cc Injectors, T1 Topfeed Conversion Rails/Lines (Plumbed in Series)
Turbo: Dom 1.5 XT-R
Engine Management: Open Source Dyno Tune
Tuner and revision of tune(if you don't mind): Keith Fields, first.
MAINTENANCE
Sensors changed: Yes
Plugs changed: Yes
Coil Packs changed: Yes
OTHER SYMPTOMS
Check Engine Light: No
Etc:
RESULTS
What has and hasn't worked for you: N/A
If something worked, how long has it been working for: While tuning, Keith was having difficulites tuning due to the stumble/stutter around 2500-3000RPMs. The results were inconsistent between dyno pulls. He was sure it was a leak somewhere. But a pressure test proved a leak to not be the issue. As a last ditch effort, we replaced the OEM Fuel Pressure Regulator/Assembly (Regulator and dampener) and installed an 06 STi Fuel Pressure Regulator. After doing so, the stumle/stutter was no longer evident and Keith was able to continue on with the tune. It's only been a few days, but no stutter/stumble issues.