Freeboosting

[Brick]

What can cause a turbo to freeboost?

I no its not the turbo (had that checked out)
All the hoses are connected.

But what else can cause it? Faulty BOV? boost controller?

any help appriciated

[Lloyd]

Well the wastegate has to be shut all the time. So either the wastegate is stuck shut, its not getting a boost feed, stuffed diaphragm etc

[escortman]

boost controller not working actuator stuffed ?

[touge rolla]

having factory boost control still connected to the system.
what sort of car/turbo/controller?

[Brick]

the actuator is apparenlty fine, as thats what i thought it was so took in to tubo place

its a tdo5 on a 4g63 and had a turbosmart whindy thing controller

[escortman]

had u tried running it with out the boost tap in?

a mate of mine bought a libero gt which open boosts cant figure out why been over all lines etc, it threw a rod haha, now hes just going external

[Lloyd]

As above take the boost controller off and see if its alright then

[matt dunn]

As above take the boost controller off and see if its alright then

yeah,

run a pipe straight from the pressure source to the actuator and see what happens.

[dr_ed]

Hey, Have done a lot of work on a mates Evo (4g63),

When he first had the car he decided to put a 3" exhaust on it, which for some reason caused it to free boost, he blew a Headgasket so he decided to make the car into a weapon, anyways....

It could quite possibly be something similar if you have an exhaust of similar description. But I would also suggest blocking up the boost controller feed and eliminating that first.

[tsoob]

As above take the boost controller off and see if its alright then

yeah,

run a pipe straight from the pressure source to the actuator and see what happens.

also check all your vac lines are hooked up to the correct places, or get an external!

[method]

freeboost is gangsta. Leave it

[tsoob]

freeboost is gangsta. Leave it

LOL OF THE WEEK !!!

[FXGTV]

HAHAHAHA, classic.

[Brick]

I know all the lines are correct because it was fine and nothing had been touched, it just happened.

Ill take out the boost controller and see if that fixes it

[Caveman]

May have burnt a line or something fell off? As everyone has already said could be...

- no vac/pressure to actuator
- actuator stuffed (diaphragm?)
- wastegate vent jammed somehow
- boost control broken

anyway hope you manage to sort it.

[Santa'sBoostinSleigh]

ive had a wastegate actuator perish causing freeboosting
from memory we used my air compressor to put pressure in all sorts of lines and see if things moved when they were mean to - wastegate actuator arm wasnt moving

[FULLOC]

just run a new piece of piping between comp housing and actuator to be sure. and id suggest pulling turbo out and checking wastegate flap as suggested above. turbo is easy to remove/refit in under an hr.

i had a gsr for a couple years and had a few similar issues such as running open boost or not boosting at all. usually always was turbo/ wastegate related.

[Brick]

just run a new piece of piping between comp housing and actuator to be sure. and id suggest pulling turbo out and checking wastegate flap as suggested above. turbo is easy to remove/refit in under an hr.

i have already changed hoses and the turbo has been in to be checked out and is fine.