-31 and -34 actuators, what's the real difference?
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PassionFord Post Whore!!
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Honestly guys, I don't know what the differences are between the two actuators.
Say for application on RST, thats why I'm asking to be honest, what difference would it make at 24psi of boost
Say for application on RST, thats why I'm asking to be honest, what difference would it make at 24psi of boost
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From: Derbyshire
when u comin down this way pie man u owe me a breakfast cooont!!
really neither are shit or good they are 4 different boost settings so if u are goin 4 well over a bar ie 1.5 bar then this is a good base
really neither are shit or good they are 4 different boost settings so if u are goin 4 well over a bar ie 1.5 bar then this is a good base
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dingy,
Stu, they run weak @ high boost, nothing but trouble, a -34 is stronger and last's longer...hence they are shat.....
Stu, they run weak @ high boost, nothing but trouble, a -34 is stronger and last's longer...hence they are shat.....
What the fook has boost got to do with the springs pressure?
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dingy,
isnt the boost a force on the spring ?
more boost, more force ?
or am i a retard here..... which is probably the case......
from experience....-31 @ high boost lasts bout 3 months....-34 yet to replace one
isnt the boost a force on the spring ?
more boost, more force ?
or am i a retard here..... which is probably the case......
from experience....-31 @ high boost lasts bout 3 months....-34 yet to replace one
But if the wastegate was open you wouldnt have any boost would you?
How Bizzare!
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Ok,
Tiny essay, then ive an engine to build....
The -31 has a base lift pressure of approx 8psi
The -34 has a base lift pressure of approx 14psi
The -31 and -34 springs are also linear/progressive rated.
In a scenario where you require 20psi with no form of boost control at all, a -34 is best as the -31 becomes useless after 15psi achieved via spring preload.
EG:
With a base lift of 8psi, to make her lift at 15psi would require you to compress the spring enough to make it lift at 15. A -34 will be in a minimum loading situation at this pressure.
However,
With correct boost control applied, we simply dont send 15psi to the actuator to make it open at 15psi, we BLEED enough air to the can to match its spring load setting.
IE:
We want to run 20.
So we load the -31 to say.. 10, and we bleed 10psi off via amal or bleed control, so the actuator ONLY gets to see 10psi.
Now,
In cases of extreme turbine housing pressure (T34 at 24+psi is a good example) we can hit the scenario where the turbine housing pressure alone is enough to overcome our spring. This is when the -34 comes into it own.
Hope this helps..
Tiny essay, then ive an engine to build....
The -31 has a base lift pressure of approx 8psi
The -34 has a base lift pressure of approx 14psi
The -31 and -34 springs are also linear/progressive rated.
In a scenario where you require 20psi with no form of boost control at all, a -34 is best as the -31 becomes useless after 15psi achieved via spring preload.
EG:
With a base lift of 8psi, to make her lift at 15psi would require you to compress the spring enough to make it lift at 15. A -34 will be in a minimum loading situation at this pressure.
However,
With correct boost control applied, we simply dont send 15psi to the actuator to make it open at 15psi, we BLEED enough air to the can to match its spring load setting.
IE:
We want to run 20.
So we load the -31 to say.. 10, and we bleed 10psi off via amal or bleed control, so the actuator ONLY gets to see 10psi.
Now,
In cases of extreme turbine housing pressure (T34 at 24+psi is a good example) we can hit the scenario where the turbine housing pressure alone is enough to overcome our spring. This is when the -34 comes into it own.
Hope this helps..
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Now,
In cases of extreme turbine housing pressure (T34 at 24+psi is a good example) we can hit the scenario where the turbine housing pressure alone is enough to overcome our spring. This is when the -34 comes into it own.
Hope this helps..
_________________
Best Regards,
Stu
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From: OTB (On the Beach), Norfolk
Originally Posted by Smit
learnt some more info today
the sites just full of it
the sites just full of it
PassionFords Creator
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Mike Gurney,
stu can you not bleed more off to compensate ?
stu can you not bleed more off to compensate ?
If the pressure in the turbine housing is 20psi, and the actuator is set at 15psi... it WILL open.
However... if we can close the line and therefore create a closed capsule......
