hi guys just wondering what this could be, as have put it down to a knackered actuator but also have another theory on a stuck wastegate but i have lost all boost.

Has been on and off for a month now where it was only boosting to .2/.3 bar, then it would suddenly come on boost.

I took it to FITP sunday (250 mile each way) and it was fine, but took it out for a run to town yesterday and after 6 miles lost all boost,

any ideas what this could be?

cheers fellas.


and whilst on the subject of actuators what do the numbers represent?

18, 22, 31 etc?

 

if u have no boost, the wastegate must be at least partly open. Sometimes they don't seat properly. Best taking the elbow off and having a look. The -18 etc are partnumbers - they have different lift off pressures.

 

well the whole lot is comin out as i have another bottom end to go in but will look then,


does anybody have an actuator for sale by any chance?

 

ians2rst - posts in RS Turbo bits for sale section - will have.

 

cant reply in there as im not a gold member.

 

seems i should try before i post,

pmsl

 

I recently had the problem that my Standard S2 was only boosting 3 psi.

Then I checked all the common troublemakers

- actuator (length and spring)
- amal valve
- searched for air leaks
- etc.

But finally it turned out to be a faulty ECU. After changing it, it boosted 7 - 8 PSI again. Maybe the vacuum sensor in there was knackered.

 

Also, check the plug that goes to the amal valve. They tend to slip off.

 

yeah amal valve and all the basics like air leaks i've gone over, still nothing

 

Should be able to reply m8, just not start a topic.

 

realised that hence above post, pmsl

 

ahhhhh! lol

 

Try another ECU!

 

mines chipped tho

 

Wait a minute. When my ECU was damaged it only boosted around 3 PSI, but it boosted. Have you really lost ALL the boost? Then you should have a look at the waste gate first.

 

I had the same problem on mine, NO boost at all.......





















Then when i remembered to connect the actuator to the wastegate it was all good

 

all is connected

and yes i have NO BOOST AT ALL

 

Can you even hear any boosting from the turbo or is there silence?

 

Ive got same prob here got no boost at all and you can hear turbo is not even spinning think ive narrowed it down to the actuator rod being to slack but will find out if it sorts it out tomorow

 

If thats the case it has to be wastegate related or in very extreme cases theres a possibility of snapped/seized shafts.

 

with mine ive just had the turbo housing off as had a bolt snapp when i put it back on think it was a little out to what it was before so the actuator rod is very lose but still connected so this is leaving the wastegate open all the time....well this is what i hope but will find out in morning

 

if it had suddenly stopped i would expect a snapped shaft yes, but its gone over a period of time, boosting, not boostin, crap boost then all of a sudden absolutely flying... so when i get time om gonna have to check the actuator,

 

Indeed a snapped shaft would be a sudden stop, as i said that is very extreme cases, yours isn't likely to be that but don't overlook it

 

cheers for the help fella, much appreciated!