Notices
ScoobyNet General General Subaru Discussion

Fix or Replace? Turbo Actuator

Old 11 February 2019, 02:37 PM
  #1  
Ash Webster
Scooby Regular
Thread Starter
 
Join Date: Dec 2013
Location: Lytham St Annes
Posts: 951
Likes: 0
Received 0 Likes on 0 Posts
Default Fix or Replace? Turbo Actuator

My turbo isnt holding pressure over 0.8 (basically no boost). After it was sat unused for a while (2 months) it held 1.3, but then after driving it for a day back to 0.8 max. There are no air leaks.

Thinking the spring is shot (stiffened up while sat but then loosened up again).

Whats the best way to remedy this?

Something like this? https://www.wrxtuners.com/forums/f70...ate-arm-18241/

or buy a new actuator?

or something else?

Cheers

Ash

Last edited by Ash Webster; 11 February 2019 at 02:38 PM.
Ash Webster is offline  
Old 11 February 2019, 02:46 PM
  #2  
Gambit
Scooby Regular
iTrader: (6)
 
Join Date: May 2003
Location: Belfast
Posts: 2,610
Likes: 0
Received 3 Likes on 3 Posts
Default

have you tested the actuator?
Gambit is offline  
Old 11 February 2019, 03:11 PM
  #3  
Mick
Scooby Senior
iTrader: (1)
 
Mick's Avatar
 
Join Date: Nov 1998
Posts: 2,647
Received 0 Likes on 0 Posts
Default

I had this on my Legacy - the wastegate actuator would not hold boost and would start bleeding pressure. A replacement actuator cured it. - cost about £70, in the end, what with being done for import duties! - Ironically the place I work at makes actuators for OEMs - but unfortunately not worth them doing 'custom parts' as too busy! - probably easier getting and Impreza part anyway.

Don't bother getting an uprated actuator as the boost control system is what really controls your boost levels as long as the actuator is working correctly. Apparently, the old Imprezas could have trouble with the boost control system if the engine oil level was too high and some oil could get sucked into the pipework and impede the pressure control...
Mick is offline  
Old 11 February 2019, 04:13 PM
  #4  
Ash Webster
Scooby Regular
Thread Starter
 
Join Date: Dec 2013
Location: Lytham St Annes
Posts: 951
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by Gambit View Post
have you tested the actuator?
have i taken it out to test? no, but all signs point to actuator

Originally Posted by Mick View Post
I had this on my Legacy - the wastegate actuator would not hold boost and would start bleeding pressure. A replacement actuator cured it. - cost about £70, in the end, what with being done for import duties! - Ironically the place I work at makes actuators for OEMs - but unfortunately not worth them doing 'custom parts' as too busy! - probably easier getting and Impreza part anyway.

Don't bother getting an uprated actuator as the boost control system is what really controls your boost levels as long as the actuator is working correctly. Apparently, the old Imprezas could have trouble with the boost control system if the engine oil level was too high and some oil could get sucked into the pipework and impede the pressure control...
aye think it might be the simplest fix - i dont want to mess around with the actuator length as i linked, but will a new actuator not need to be mapped in? (wg crack pressure might be different)...
Ash Webster is offline  
Old 12 February 2019, 09:59 AM
  #5  
Mick
Scooby Senior
iTrader: (1)
 
Mick's Avatar
 
Join Date: Nov 1998
Posts: 2,647
Received 0 Likes on 0 Posts
Default

If you get one rated the same then there is no need to get it remapped - Like for the Legacy you can get them in a variety of pressure settings, but not really an advantage unless your mapper suggests it.

The springs weaken with time and don't hold the full pressure that they are originally rated to. I checked my old one with a footpump when the new one arrived to compare it with and there was a noticeable difference in the pressure required to make them move
Mick is offline  
Old 12 February 2019, 12:19 PM
  #6  
BrownPantsRacing
Scooby Regular
iTrader: (6)
 
BrownPantsRacing's Avatar
 
Join Date: Oct 2010
Location: Herts & Bucks
Posts: 8,160
Likes: 0
Received 7 Likes on 7 Posts
Default

As far as I know a standard VF48 actuator is 0.8bar spring rating. Turbo's like the SC42 have a 1.0bar spring and you can also get stronger like a 1.2bar spring as now fitted to mine, which will allow the turbo to hold better boost towards 2.0bar. If you uprate the spring, then as said it's worth getting the map checked and corrected accordingly. If you fit the same rated actuator then you should be fine.

I was also advised by Turbo Dynamics to never use the Forge actuators as they do not deliver a smooth action in use and can cause jumpy response under boost. Turbo Dynamics never supply these, but can supply other standard and uprated ones at a fraction of the cost.
BrownPantsRacing is offline  
Old 12 February 2019, 01:55 PM
  #7  
Jay kay
Scooby Regular
 
Join Date: Oct 2016
Location: Hertfordshire
Posts: 256
Likes: 0
Received 0 Likes on 0 Posts
Default

I have forge on mine (1 bar spring) and its perfectly fine, never had any problems with it. Boosts around 1.5 bar on my Defi gauge
Jay kay is offline  
Old 12 February 2019, 04:31 PM
  #8  
Vxr2010
Scooby Regular
 
Join Date: Oct 2015
Location: Herts
Posts: 891
Likes: 0
Received 0 Likes on 0 Posts
Default

if itís only hitting .8 try cleaning the boost solenoid , itís an easy job to do , if it works then great if it improves but then ends up back at .8 then you may need a new one , there are two colours so itís one or the other , use carb cleaner and spray it in both holes
Vxr2010 is offline  
Old 12 February 2019, 04:59 PM
  #9  
Ash Webster
Scooby Regular
Thread Starter
 
Join Date: Dec 2013
Location: Lytham St Annes
Posts: 951
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by BrownPantsRacing View Post
As far as I know a standard VF48 actuator is 0.8bar spring rating. Turbo's like the SC42 have a 1.0bar spring and you can also get stronger like a 1.2bar spring as now fitted to mine, which will allow the turbo to hold better boost towards 2.0bar. If you uprate the spring, then as said it's worth getting the map checked and corrected accordingly. If you fit the same rated actuator then you should be fine.

I was also advised by Turbo Dynamics to never use the Forge actuators as they do not deliver a smooth action in use and can cause jumpy response under boost. Turbo Dynamics never supply these, but can supply other standard and uprated ones at a fraction of the cost.
Am i right in thinking the V3 STI has a VF22? Im struggling to identify the actual turbo i have (whilst its in the car) as the numbers have worn off over time... its defnitely an IHI and i can just about make out RHF5 but nothing after. Are there any other ways to ID the turbo apart from removing it haha

Originally Posted by Vxr2010 View Post
if it’s only hitting .8 try cleaning the boost solenoid , it’s an easy job to do , if it works then great if it improves but then ends up back at .8 then you may need a new one , there are two colours so it’s one or the other , use carb cleaner and spray it in both holes
i could try that too, cheers. I have a 3 port ready to go on but waiting to get it mapped in with a few other mods. Hasnt helped with ScoobyTek (ScoobySpares) fleetwood closing down (where Andy Carr maps out of),...


I just need to ID the turbo so i can get the correct spring - i've spoke to matty about getting an actuator but he says theyre never in , and also that they vary with turbo so i need to get the specific model...

Last edited by Ash Webster; 12 February 2019 at 05:03 PM.
Ash Webster is offline  
Old 12 February 2019, 10:35 PM
  #10  
Vxr2010
Scooby Regular
 
Join Date: Oct 2015
Location: Herts
Posts: 891
Likes: 0
Received 0 Likes on 0 Posts
Default

As above why not clean/check boost solenoid , i had the same symptoms twice , one i cleaned and one i cleaned but had to replace , need to engine reset after
Vxr2010 is offline  
Old 12 February 2019, 10:45 PM
  #11  
jameswrx
Scooby Regular
iTrader: (4)
 
Join Date: Sep 2002
Location: Kent
Posts: 6,411
Likes: 0
Received 0 Likes on 0 Posts
Default

Very unlikely the actuator spring has suddenly failed weaker like that. Actuator issues would be over boost related usually (split diaphragm, rusted seized arm etc)

I’d be more inclined to go along with a problem with your electronic boost control (as mentioned above) as it soumds
like you’re just getting wastegate pressure and no bleed off of the air to the actuator
jameswrx is offline  
Old 13 February 2019, 09:42 AM
  #12  
Mick
Scooby Senior
iTrader: (1)
 
Mick's Avatar
 
Join Date: Nov 1998
Posts: 2,647
Received 0 Likes on 0 Posts
Thumbs up

Hi Ash - Andrew Carr did mine - you can get his contact details and see his schedule on his website - you don't need to go through ScoobySpares.

www.teamcarr.net might be best to email him direct - [email protected]
Mick is offline  
Old 13 February 2019, 09:48 AM
  #13  
BrownPantsRacing
Scooby Regular
iTrader: (6)
 
BrownPantsRacing's Avatar
 
Join Date: Oct 2010
Location: Herts & Bucks
Posts: 8,160
Likes: 0
Received 7 Likes on 7 Posts
Default

I emailed Andrew Carr over a week ago about something and still haven't got a reply. Don't expect anything in a hurry, he's always busy and terrible at coming back to you sometimes. Like most mappers!
BrownPantsRacing is offline  
Old 14 February 2019, 05:31 PM
  #14  
Ash Webster
Scooby Regular
Thread Starter
 
Join Date: Dec 2013
Location: Lytham St Annes
Posts: 951
Likes: 0
Received 0 Likes on 0 Posts
Default

aye hes like rocking horse **** to get hold of....

hence why i always booked him through scoobytek, they did the hard work for me!

I rang up Teg Sport (lancaster) and lo and behold he maps out of there too!! but apprantly hes been in a bike crash and hurt/broke his wrists or something so hes only doing one day a week and booked up for months.....

Going to get the BCS cleaned this weekend, and if not ill be ordering a few diff replacement springs. I have gauges in the car so i shouldnt overboost and im not stupid enough to fit the max psi rated one first!

Ideally id like to have all my mods fitted and mapped and the problem sorted that way but it doesnt look like Andy will be free anytime soon >.<... will just have to get booked in and be patient.....
Ash Webster is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
gembow
General Technical
6
13 April 2015 06:55 PM
kezwaldo
ScoobyNet General
1
14 July 2013 09:39 PM
Jazzy Jefferson
General Technical
23
12 July 2013 01:50 PM
w13dle
General Technical
0
08 August 2009 12:49 PM
Ru55e11
Non Scooby Related
12
20 September 2007 08:47 PM


Thread Tools
Search this Thread
Quick Reply: Fix or Replace? Turbo Actuator


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.