After some help have just got home from work and on the way home noticed the car over boosting to 1.4 normal 1bar when hitting boost popping and banging this is after a little fun with a focus st refilled with v power and it started but olso notice a little splutter befor but no where near as bad any ideas and is it normal the dump valve to be open on tick over ???
Thanks

 

Any one ???

 

Is it a aftermarket DV on the car. Impreza's are notorious for running crap with aftermarket vent to atmosphere DV's on, overboost is just one of those issues. Put it back to a recirc valve and will improve the engine's health.


the DV will be open on tickover, soon as u touch the throttle it will close

 

What car ? any mods ?

 

Its a uk 2000 with bailey dv ran fine for 1000 miles then started last night only mods air filter and exhaust

 

All parts can fail bud, as stated bailey or any aftermarket dump valves for that matter.. Imprezas tend to like the recirc. Through my experience with turbo cars,and I've had quite a few trust me.. Dump valves usually lose boost when failing trough worn springs etc. not course overboost.
I'd be checking the actuator first off. Or have you recently had the exhaust fitted? As this can increase spool speed and course boost spike..
Anyone who would like to add or correct me feel free

 

Has it been mapped for the DV, Filter and Exhaust?

 

Check to see if the waste gate pipe didn't pop off

Do you have one of those nasty manual boost controllers installed?