when do u need to change from -31 to -34 actuator
25-12-2004, 04:03 PM
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when do u need to change from -31 to -34 actuator
am currently @ 24 psi and the -31 has been on a few years(with no complaint) 
and having greys fitted shortly and hoping for 30psi so is a -31 good enough or is it time for a -34? on a t34 turbo
and having greys fitted shortly and hoping for 30psi so is a -31 good enough or is it time for a -34? on a t34 turbo
25-12-2004, 06:45 PM
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ok so a -31 can take 30+psi no probs will hold on from buying a new one for now then 
BUT do u know when or why peeps would change to a -34.
BUT do u know when or why peeps would change to a -34.
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25-12-2004, 07:14 PM
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There was an article answered on here by Stu explaining it.
Try a search.
I seem to remember that the -31 has an opening pressure on the diaphragm of around 7psi whereas the -34 is about 14psi.
Obviously if you are aiming for around 30 psi this would mean if you adjusted the
-31 upto around 10psi you would have to bleed 20psi off
What a waste of boost....
whereas with the -34 tweaked to around 18 psi you would only need to bleed off 12 psi.
Think there was more to it as well, something to do with Compressor housing pressures of a T34 being higher than the T3.........
Try a search.
I seem to remember that the -31 has an opening pressure on the diaphragm of around 7psi whereas the -34 is about 14psi.
Obviously if you are aiming for around 30 psi this would mean if you adjusted the
-31 upto around 10psi you would have to bleed 20psi off
What a waste of boost....
whereas with the -34 tweaked to around 18 psi you would only need to bleed off 12 psi.
Think there was more to it as well, something to do with Compressor housing pressures of a T34 being higher than the T3.........
26-12-2004, 09:16 AM
#13
20K+ Super Poster.
but if it works it works!!!
theyres 2 points off the top of my head...
26-12-2004, 09:39 AM
#19
was set up by harvey gibbs on a t34 (.63) with a sleeved amal valve,worked perfect NEVER got ANY other readings,no creep nothing,34 psi,then quick drop to 26 but it never stopped pulling(cams i reckon, bd 16)
not arguing,just thats EXACTLY what it did and was a -31
not arguing,just thats EXACTLY what it did and was a -31
26-12-2004, 11:18 AM
#21
just finding my feet
Originally Posted by big_wig_074
was set up by harvey gibbs on a t34 (.63) with a sleeved amal valve,worked perfect NEVER got ANY other readings,no creep nothing,34 psi,then quick drop to 26 but it never stopped pulling(cams i reckon, bd 16)
not arguing,just thats EXACTLY what it did and was a -31
not arguing,just thats EXACTLY what it did and was a -31
im not gonna argue with ya at all matey
not saying its right or wrong just mentioning that there are now other options now and sometimes there better than the old ways
mine deffo cams btw as mine fooking pulls in all gears at just under 4 grand to the limiter
wes thats the thing about the -34 is stays shut and at a set psi it then opens and thats what ya get, otherwise ya do get a bit of boost creep ( ya wont really notice it due to the setting up of the car, just like ya can set a car up with a boost leak and still get it to hold the psi, ya will be over speeding the turbo to make that though
its a shame ya broke ya cossie as that had a mental engine in it, ya was very unlucky
26-12-2004, 12:37 PM
#23
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Jb Fletch Posting :
Easy peeps,
I had the -31 on my old lump (big wigs engine) and peaked @ 3 Bar & held 2 Bar all day long to the limiter. No creep or drop off, when Harvey took the lid off there was no signs of det which Harvey couldn't believe ! But the cams were the bollox !
I changed from -31 tp -34 on my rs turbo and that peaked 22 and held 18 psi. Couldn't work out why they changed it cos the Cossie run double that on a -31. Prob down to the turbo its self ?
Big Wig, you not got the mota no more then ? I'm building another one !
Cheers
Jb
Easy peeps,
I had the -31 on my old lump (big wigs engine) and peaked @ 3 Bar & held 2 Bar all day long to the limiter. No creep or drop off, when Harvey took the lid off there was no signs of det which Harvey couldn't believe ! But the cams were the bollox !
I changed from -31 tp -34 on my rs turbo and that peaked 22 and held 18 psi. Couldn't work out why they changed it cos the Cossie run double that on a -31. Prob down to the turbo its self ?
Big Wig, you not got the mota no more then ? I'm building another one !
Cheers
Jb
26-12-2004, 01:59 PM
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Jb Postin:
Oi bruv, dont even think bout questioning it until you all all the facts yeah ! Prick.
Harvey always said i was mad too !
Ok the guage might not have been completely acurate but when put on my brothers stage 3 Saph, that showed 25psi which was the same as his guage.
Ask anyone who went in the car or who knew me. They'll tell ya what it went like & what pressures was seen on the guage.
Mikey Rainbird always called me a boost junky cos everytime i see him id turned it up a bit more.
Jb
Oi bruv, dont even think bout questioning it until you all all the facts yeah ! Prick.
Harvey always said i was mad too !
Ok the guage might not have been completely acurate but when put on my brothers stage 3 Saph, that showed 25psi which was the same as his guage.
Ask anyone who went in the car or who knew me. They'll tell ya what it went like & what pressures was seen on the guage.
Mikey Rainbird always called me a boost junky cos everytime i see him id turned it up a bit more.
Jb
26-12-2004, 07:16 PM
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Originally Posted by Lee R
Alvyn, I have a virtually brand new -34 for sale, keep it in mind
oh and every one calm down IT'S XMAS
26-12-2004, 07:21 PM
#30
Professional Waffler
Originally Posted by ian m
14.7 psi = 1 bar multipied by 3 = 44.1 psi or is it different in wales ? 
1 bar = 14.5037738 pounds per square inch
the confusion comes when talking about standard atmoperic pressure
which is 1.013 bar,, which is 14.7 psi
26-12-2004, 07:23 PM
#31
just finding my feet
Originally Posted by GARETH T
Originally Posted by ian m
14.7 psi = 1 bar multipied by 3 = 44.1 psi or is it different in wales ?
1 bar = 14.5037738 pounds per square inch
the confusion comes when talking about standard atmoperic pressure
which is 1.013 bar,, which is 14.7 psi
what he said is right
26-12-2004, 07:27 PM
#32
Professional Waffler
Originally Posted by b19bal
Originally Posted by GARETH T
Originally Posted by ian m
14.7 psi = 1 bar multipied by 3 = 44.1 psi or is it different in wales ?
1 bar = 14.5037738 pounds per square inch
the confusion comes when talking about standard atmoperic pressure
which is 1.013 bar,, which is 14.7 psi
what he said is right
but really is 3 x 14.5 (ish) which is 43.5
26-12-2004, 08:28 PM
#34
jb: alright matey,nah,last time you talked to me it had just done a bottom pulley,scc quoted about 3 grand to repair the motor(10 valves,2 pistons etc etc!!!) so i decided i had fook all cash left,and quit while the goin was tough! bugger me was a quick engine,BUT every time i DIDNT drive it hard it blew up on me in one way or another,loved bein thrashed but hated sedate driving! musta loved you! but just wait till my next project hits the streets,gonna be stealth as fook!
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