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Corolla FXGT · by **Brick** » Thu Jun 26, 2008 7:42 pm

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

by **Lloyd** » Thu Jun 26, 2008 7:47 pm

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

by **escortman** » Thu Jun 26, 2008 7:51 pm

boost controller not working actuator stuffed ?

by **touge rolla** » Thu Jun 26, 2008 7:56 pm

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

Corolla FXGT · by **Brick** » Thu Jun 26, 2008 10:19 pm

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

by **escortman** » Thu Jun 26, 2008 10:38 pm

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

by **Lloyd** » Thu Jun 26, 2008 11:04 pm

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

by **matt dunn** » Thu Jun 26, 2008 11:50 pm

HRT wrote: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.

by **dr_ed** » Fri Jun 27, 2008 12:29 am

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.

by **tsoob** » Fri Jun 27, 2008 11:45 am

matt dunn wrote:
HRT wrote: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!

PICS UPDATED DAILY · by **method** » Fri Jun 27, 2008 2:57 pm

freeboost is gangsta. Leave it

by **tsoob** » Fri Jun 27, 2008 4:12 pm

method wrote:freeboost is gangsta. Leave it

LOL OF THE WEEK !!!

by **FXGTV** » Fri Jun 27, 2008 4:43 pm

HAHAHAHA, classic.

Corolla FXGT · by **Brick** » Fri Jun 27, 2008 6:47 pm

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

AW11 Track Toy · by **Caveman** » Fri Jun 27, 2008 9:28 pm

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's TardMe Listings · by **Santa'sBoostinSleigh** » Fri Jun 27, 2008 10:23 pm

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

by **FULLOC** » Sun Jun 29, 2008 4:15 pm

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.

Corolla FXGT · by **Brick** » Sun Jun 29, 2008 5:01 pm

FULLOC wrote: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.

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