Under boosting?

[ReeceGolliker]

Hi, my cars running stock boost and boosts to 10psi but I've noticed tonight most of the time in 3rd it's boosting to 10psi then down to 5psi? It's doing this in third and occasionally 4th? What could cause this? Boost leak?

[corofin12345]

may be a leak but could possible be a actuator or wastgate issue too.... then again i dont know your setup look for a leak first off anyway

[ReeceGolliker]

Stock boost and actuator, usually boosts and hold strong at 10psi, I'll check all the piping tomorrow and make sure theirs no leaks! Seen a few people say about the stock actuators deteriorating?

[turbominicooper]

check your actuator, my bracket was loose so when it boosted and the actuator opened the gate it would then push itself back causing a fluctuation on boost

[ReeceGolliker]

ok ill have a look thanks, its not all the time but it is most of the time in 3rd, I've checked and i can't see any leaks

[Socks]

Old/Perished/Fucked actuator is a favorite for this problem.

[ReeceGolliker]

so if i get another stock actuator it would be ok? or would i just be able to replace the spring? thanks

[5e colin]

swap over for hks unit there adjustable and hold boost better

[ReeceGolliker]

Ok, is it an easy job for someone who isn't a mechanic? 😂

[Ryan_EP82 GT]

Your stock actuator is fucked. Two bolts and a clip hold it onto the turbo, hardest bit is getting the clip off so no it isnt tough.

If youve the efi pipe all still fitted youd be best removing it for access

[Roachy1994]

If you put an adjustable on their make sure you dont turn it up to 2.8 bar :')

[ReeceGolliker]

Haha, I did read that post 😂😂 whoever told him that would be ok deserves medal 😂