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

James Raby · 2003-11-27 11:55:40

springs....lol... -34 better -31 is shat. LOL AROFLMFAO :cry: :cry: :cry: What a muppet :cry: PON on Rob's log in ;)

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Dec 2, 2003 | 01:31 PM

#41

Rob M666SCC

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Quote:

Originally Posted by dingy

springs....lol...

-34 better

-31 is shat. LOL

AROFLMFAO

What a muppet

PON on Rob's log in

Dec 2, 2003 | 02:04 PM

#42

SapphyMike

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so to run 22psi held. is a -31 or a -34 a better Actuator, as this is confusing LOL

Dec 2, 2003 | 03:02 PM

#43

James Raby

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I read it as being a -34 is better for high boost (over 15psi) applications

Dec 2, 2003 | 03:02 PM

#44

Stu @ M Developments

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Well im glad someone read it

Dec 2, 2003 | 03:06 PM

#45

Oranoco

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Now I'm totally confused

Good essay though Stu mate. Dunno what it means but it sounded good so I'll give you an A for it.

Dec 2, 2003 | 03:11 PM

#46

SapphyMike

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i did read it stu, but to me it reads that you can bleed off 10psi and set the -31 to 10psi, which by your essay looks like it cant be done because the -31 can only to 8psi?

Dec 2, 2003 | 03:53 PM

#47

Mike Gurney

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what about using the 31 with a different sized restrictor

Nov 23, 2005 | 10:58 PM

#48

Stu @ M Developments

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bttt

Sep 21, 2006 | 01:18 PM

#49

g4ost

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Just got my -34 through the door this morning from yourself stu and now i think i understand a bit more

Great info, even if it is a couple of years old

Jan 23, 2008 | 03:41 PM

#50

Diamonds.

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well i know what im gonna be putting on my turbo now for sure

Oct 8, 2008 | 11:54 PM

#51

Smartdj.

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after reading this im going for da -34 im thinking...good thread

Feb 23, 2009 | 08:49 PM

#52

Jimbo's Cossie

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Quote:

Originally Posted by Stu @ M Developments

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.

When you say you load the -31, in what way do you mean? sorry to sound stupid, double checking somthing(thinking preload)

Feb 24, 2009 | 05:02 PM

#53

JTECH James

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yes preload

Feb 25, 2009 | 10:12 PM

#54

Jimbo's Cossie

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ah somthing james f knows all about judging by the actuators an rods he has destroryied.

Feb 25, 2009 | 10:14 PM

#55

JTECH James

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i dont know why tho, i was running 36psi on my t34, and never broke a rod or actuator in over 60k miles

infact the same actuator is now on my t4...

has he jetted the amal?

Feb 28, 2009 | 02:24 PM

#56

Jimbo's Cossie

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not using it to my knowledge. bleed valve job.

Mar 1, 2009 | 02:20 AM

#57

Stu @ M Developments

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The T34 has a harmonic frequency problem on many YB's that cause it to sheer the shaft clean in two just where the locknut locks up the adjustable rod end.

This is why Garret redesigned the rod end for the T34 and made a much longer one. Ive no idea why it doesnt afflict all engines.

May 10, 2009 | 10:57 AM

#58

cossie4i+

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Seems like i need a -34 then

Best ask Stu before ordering it as my car was set up on a -31 by him.

Steve

May 12, 2009 | 11:04 PM

#59

Rs Cosworth 1

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So right let me get this straight.

Another newb here so be gentle.

My escort RS turbo make's 19psi but the atuator is stock looking i know they do stock looking -31's but would i need a -34?

May 14, 2009 | 05:41 PM

#60

Karlos G

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Quote:

Originally Posted by Rs Cosworth 1

So right let me get this straight.

Another newb here so be gentle.

My escort RS turbo make's 19psi but the atuator is stock looking i know they do stock looking -31's but would i need a -34?

If your wanting to hold 19psi then you could use a -31 preload set to 10psi and bleed 9psi off, or you could use a -34 preload at 15psi and bleed off 4psi.
Or there abouts!