-31 and -34 actuators, what's the real difference?
 

Does the -34 just bring boost in with a bang?
Or is there more to it than that?

-3 :blabla:

far more to it than that..

Completely different spring ratings.

so which one is better....................... stu?????

springs....lol...

-34 better

-31 is shat. LOL

but depends on application :D

How can a -31 be shit Dingy? :?

350bhp cossie running 24psi???? and t35 what u reccomend

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

Stu, they run weak @ high boost, nothing but trouble, a -34 is stronger and last's longer...hence they are shat.....


but depends on application.....6psi rst don't need one does it.

Oli's rst has had a -34 on for ages....from 18psi onwards ;)

ELTONS words of wisdom lol :blabla:

:cry: :cry: :cry: :cry: :cry: :cry:

fpmsl @ Andy!

shut it pie man

:blabla: :blabla: :blabla:

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 :top:

That sounded like a statement of fact to me... i guess you must have fitted more of them than i have then eh?

What the fook has boost got to do with the springs pressure? :?

lol :cry: :cry: :cry: :cry: :cry: :cry: :cry:

I'm not sure either stu... my Dingy can enlighten us!

alex

yeah will wait to find out to, same spec as roosie. which one is better?

isnt the boost a force on the spring ?

more boost, more force ?

or am i a retard here..... :wall: :wall: :wall: which is probably the case......

from experience....-31 @ high boost lasts bout 3 months....-34 yet to replace one

If you had more boost on the spring, would the wastegate not be open...?

But if the wastegate was open you wouldnt have any boost would you?

How Bizzare! :eek:


:cry: :blabla:

PMSL i get that, but isn't it an aposing force ?

What would peeps suggest for mine, got used to -34 on it, so might stick with it

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.. :top:

:top:

top essay stu

what engine are you building?

a;ex

T4 cossie..

So why am i still here?..... Doh :wall:

Nearly done now anyway :DD:

Something useful for everyone that me thinks
Top man Stu :top:

-34 staying put :content:

lol@eltons pie man comment fool olli ill get the brekies next time im down lad :blabla:

I nearly got a -64 on mine but I ended up using an amal valve I think it was 22psi rating (base lift), what other "dash" ratings are there on actuators.

:roll: :roll:

good post :top:

muppet room here we come

so i i may not need a -34 but can prob keep a -31 instead, cheers and as said again good post stu :top:

Stu wrote an Essay less than 200 words

Must have cramp in his fingers :blabla:

learnt some more info today :top:

the sites just full of it :banana:

stu can you not bleed more off to compensate ?

It's always a question that gets asked off the BB, so thought i'd ask and this way everyone can know the answer :top:

-34 here proper mint mind you the boost has been NMS'D so there is no spike or drop off at 1.8 bar :top: on my T34 you just gotta have 1 there fuckin animal i tell thee

No.

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...... ;)

hence where air injectors come into play :top: am i right :top:

can you explain Stu ?