Over boost 2 bar 53sti
 

Today my sti started to over boost and my defi was reading over 2 bar the car has supporting mods and running 360bhp where should I start looking to cure this

How does it drive ? I would expect over 2 bar of boost would cause a fuel cut out making it drive really bad. If it's driving fine then maybe your gauge is playing up. Can you plug in a OBDII tool and read actual boost that the ECU sees via the MAP sensor.

It drives ok you can feel it pulling more than usual once I relised what it was doing I stopped driving it on boost on a side note i have noticed that i need to replace a few vacuum hose butt they are all the 3mm ones but there ok at the min

could be the boost solenoid has failed.

Would that bring up a engine management light because at the mo the light isn't on?

2bar! Like a BOSS!

Contact your mapper and ask a few questions. Do you know what max boost it was mapped at?

Yeah had the car since November has be running 1.5 bar but the other day it just started running at 2 bar most of the work was done before i got it and scoobyclinic fitted most of it but there miles from me so I'm waiting to hear back from zen hopefully it can go to them in a week or two and there is a few other bits that i want doing but would be nice to solve this so I can use it

Is your car still running the standard map boost sensor or is it fitted with an uprated 3 bar map sensor? If it’s the standard sensor then 1.5bar over a long period of time may have been a little too much. Might be on the way out. Might be best to upgrade & remap.

Also, i'd trust what the Defi gauge says.

I'm not sure what map sensor it has how would I check this?

Not something I have looked into myself so can not advise where it is and how to check it sorry. Would suggest contacting Scoobyclinic, they might have a record of what was fitted when it was mapped and may have other suggestions of what might be wrong. Give em a ring.

I suspect the boost control pipes have come off or have a split.

Check turbo smal diameter pipes are all on and no splits

I found one that had perished that I think it went from the two port boost solenoid to the actuator So I sorted that put its still the same i think I need to buy a load of piping and just redo the lot I've ordered so 3mm what other sizes are there ?.

that should do it, there is a metal pill in the pipe between compressor cover and Tee piece, make sure it is not blocked and place it in new pipe

Ok il check that pipe as well tomorrow thanks for your help

Problem solved pipe that goes into to lower nipple on the turbo had a split so just ordered a few meters of 5mm to replace all of that as well thanks for every ones help

cool, just make sure you transfer the metal pill in to the new hose if still on a 2port (Tee piece fitted between hosed on the turbo)