-31 Actuator - what happends what they are nackered?
PassionFords Creator
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From: Blackpool, UK Destination: Rev limiter
Ok...
An actuator is very simply, a shaft, with a cap at one end, rivetted to rubber type diaphragm. Underneath the diaghragm is a spring.
The boost acts on teh rubber diaghragm and compresses the spring, thus sending the shaft outwards, which then operates the wastegate it is attached too as required.
When the spring softens due to simple metal fatigue, it takes less boost to move it and thus the wastegate is operated too soon, thus the loss of boost pressure.
And it really is as simple as that.
An actuator is very simply, a shaft, with a cap at one end, rivetted to rubber type diaphragm. Underneath the diaghragm is a spring.
The boost acts on teh rubber diaghragm and compresses the spring, thus sending the shaft outwards, which then operates the wastegate it is attached too as required.
When the spring softens due to simple metal fatigue, it takes less boost to move it and thus the wastegate is operated too soon, thus the loss of boost pressure.
And it really is as simple as that.
will get a -31 though before she comes back out in April!
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PassionFord Post Whore!!
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From: Bedfordshire
Originally Posted by bud-weis
Originally Posted by Stu @ M Developments
You should take advantage of my incredible sale price before it ends tomorrow 
And cheap too.....
Mine turned up this morning.... and I only ordered it yesterday
Excellent service.... Dawn cant wait to feel 10psi again.... Oooooh er
Cheers Stu
!!
PassionFords Creator
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From: Blackpool, UK Destination: Rev limiter
Originally Posted by diamonds
Stu how much do you normally sell the -34 for? cause my -31 is foooked but i dont think ill have the money b4 xmas to get one
Your welcome Neil, only delivering the service you paid for pal.
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PassionFord Post Troll
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Reason i ask is because karl had to add more preload than expected to get the car to hold the boost we wanted. And whilst mapping we noticed the boost level it was holding was getting progressivly worse and worse (going from 20-21 to 17-18. Karl pointed out this can be caused by a crappy material used on the wastegate arm but before i go changing anything just wanted to know if this can be caused by the actuator at all? (and i cant get hold of the o'mighty short one 
)
Cheers for the replys!
Dan
)Cheers for the replys!
Dan
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Originally Posted by Stu @ M Developments
Originally Posted by diamonds
Stu how much do you normally sell the -34 for? cause my -31 is foooked but i dont think ill have the money b4 xmas to get one
Your welcome Neil, only delivering the service you paid for pal.
Thread Starter
PassionFord Post Troll
Joined: May 2003
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Originally Posted by DanS
Reason i ask is because karl had to add more preload than expected to get the car to hold the boost we wanted. And whilst mapping we noticed the boost level it was holding was getting progressivly worse and worse (going from 20-21 to 17-18. Karl pointed out this can be caused by a crappy material used on the wastegate arm but before i go changing anything just wanted to know if this can be caused by the actuator at all? (and i cant get hold of the o'mighty short one )
Cheers for the replys!
Dan
)Cheers for the replys!
Dan
Football Cwazy
Joined: Oct 2004
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From: Redditch, Worcestershire
i'm afraid Karl wil know best about the ins and outs of your problem. But yes poor holding of boost can be caused by a weak spring.
at the end of the day it can do no harm to have a new actuator on there, so get yourself a genuine garrett on there and get Karl to set the boost for you.
at the end of the day it can do no harm to have a new actuator on there, so get yourself a genuine garrett on there and get Karl to set the boost for you.
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