Can't Boost

[yellow R32]

hi guys, have a read of this and see what ya think

My GTS-T currently runs 10.5psi without a bleed off valve, when i fitted one and adjusted it to 12psi it made it reall laggy and started detonating, this all started after the origonal engine died of TMB but that used to run 14psi no worries with the same bleed valve. My only thoughts is that my car is a type M and maybe the second hand engine was not, but is there even a difference? The car still goes hard how it is but i no it used to go better. PLEASE HELP! :headspin:

[Ronin]

If your going to up the boost, get your chip re-mapped and get your a/f ratios checked.

[BHDave]

There's no difference in the engines.

I'd say the bleed is either blocked up with shit or is installed incorrectly. Time to start trouble shooting.

Pull the bleed back out and run the car, see what it does. If it's good then i'd be checking the bleed valve out. Make sure the restrictor hasn't been blocked up as it will mean the wastegate closes slower and therefore lets exhaust gas past the turbine. If the bleed is ok then reinstall it but fully close it. It should have very little effect on boost response. If it does effect it badly i'd be throwing it in the bin. Thats the only thing i can think of.

Or the car is pinging its head off and the computer is retarding the timing to try and stop it.