deciding on what pressure of wastegate spring for a friends build....it's going to be in a tial 38mm...and he's wanting to run over 22psi for the track, but still is going to daily drive it so doesn't want to have super high boost daily...

will a 1bar work good?

 

I would go with the 1 bar.

 

werd, that's what we're thinking

 

iam faced with the same problem i maxed out my .5 bar one thing would only boost 13.8psi so iam going to get the 1 bar spring good choice

 

I made 515 @19psi with a .8bar...but I have a 40mm wastegate.

 

why are you going to have a 500hp DD civic?
<------------------------
Rob you like my picture?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DaX &raquo;</TD></TR><TR><TD CLASS="quote">I would go with the 1 bar.</TD></TR></TABLE>

agreed..that would let you go up to 2bar (what most map sensors read too) and a 15psi low for the street is perfect.

1bar spring is what i use in my tial 40mm

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Soon_2b_evil &raquo;</TD></TR><TR><TD CLASS="quote">why are you going to have a 500hp DD civic?
&lt;------------------------
Rob you like my picture?</TD></TR></TABLE>
it's a build i'm working on with a friend, actually

n/a is best bitches!

btw, we should start an RLZ avatar club..cause that's you, eugene, and i so far

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GSRswapandslow. &raquo;</TD></TR><TR><TD CLASS="quote">
it's a build i'm working on with a friend, actually

n/a is best bitches!
</TD></TR></TABLE>

NA is best?
whatever ROB.

 

you and I are running at the track...i hope you know that...

we'll see what's better

 

I run a .8 Bar spring BIUT would like to upgrade to a 1 bar spring BECAUSE my Profec B will only go so high depending on the WG spring, I have got it to do 30psi . Now keep in mind that C will be able to INCREASE his boost pressure easily with a boost controller BUT he will not be able to decrease his boost lower than the wastgeate spring! Well actually he can BUT Only slightly maybe 1-2psi, if you get your boost source for the wastgeate before the ic at the turbo then the wastgeate will control boost at the turbo then you lose about 1-2psi usually through the IC to the intake manifold BUT if you get your wastgeate signal from the intake manifold then the boost will be controlled by what was seen at the intake mani. Make sense? Wastegate to turbo=11psi at turbo travels through ic to intake mani=9psi(just examples) , Boost signal taken fom Intake mani will be 11psi because it has already gone through the ic

 

Go with a .5 bar spring and you can always turn it up by a boost controller! My opinion.

 

I thought it was a rule to not boost twice the spring rate, is that not true?

 

Rule not to boost more than twice the spring rate. I think if you double your spring rate, you're getting pretty close to pushing it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DaX &raquo;</TD></TR><TR><TD CLASS="quote">Rule not to boost more than twice the spring rate. I think if you double your spring rate, you're getting pretty close to pushing it.</TD></TR></TABLE>

Thats what I thought.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Boostfed &raquo;</TD></TR><TR><TD CLASS="quote">I run a .8 Bar spring BIUT would like to upgrade to a 1 bar spring BECAUSE my Profec B will only go so high depending on the WG spring, I have got it to do 30psi . Now keep in mind that C will be able to INCREASE his boost pressure easily with a boost controller BUT he will not be able to decrease his boost lower than the wastgeate spring! Well actually he can BUT Only slightly maybe 1-2psi, if you get your boost source for the wastgeate before the ic at the turbo then the wastgeate will control boost at the turbo then you lose about 1-2psi usually through the IC to the intake manifold BUT if you get your wastgeate signal from the intake manifold then the boost will be controlled by what was seen at the intake mani. Make sense? Wastegate to turbo=11psi at turbo travels through ic to intake mani=9psi(just examples) , Boost signal taken fom Intake mani will be 11psi because it has already gone through the ic </TD></TR></TABLE>

Do you have any trouble controlling the boost?

 

No problems controllin boost at all. Just sometimes hard to eek more out of it!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mikes01GSR &raquo;</TD></TR><TR><TD CLASS="quote">I thought it was a rule to not boost twice the spring rate, is that not true?</TD></TR></TABLE>

I heard it isnt good but i ran 15psi on a 6psi spring and it works fine...no creeping...no spikeing...nothing bad.

 

I ran into the same problem. I have the 6.5psi spring in my Tial 35mm. Dynoed, but couldn't go past 13psi no matter how much I turned up the boost controller. I ordered a .8bar spring from wiredspeedlab. From what I understand, after so much boost (rule of thumb is twice the spring rate as mentioned), the pressure is so great on the wastegate spring that it just opens automatically and bleeds boost.

 

thanks terry...that helps a LOT...

you'll just have to talk to C about stuff...and i'm sure he'll follow the path you lead

you da man

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DaX &raquo;</TD></TR><TR><TD CLASS="quote">Rule not to boost more than twice the spring rate. I think if you double your spring rate, you're getting pretty close to pushing it.</TD></TR></TABLE>

Really? I guess I need another spring. Ran 20+ PSI on a 6LB spring. I need to swap it out anyway. Why is it bad to run more than double the rating?

 

You're tiring the spring...I think you can warp it by trying to over work the gate.

 

So why doesn't everyone just get a 1 bar spring so you can run 6 PSI or 15 PSI? Is it bad to get too high of a spring?

 

your spring rating is the lowest boost you can turn down to

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by adseguy &raquo;</TD></TR><TR><TD CLASS="quote">So why doesn't everyone just get a 1 bar spring so you can run 6 PSI or 15 PSI? Is it bad to get too high of a spring?</TD></TR></TABLE>

1bar = 14.5psi...
Like markaria is saying, this is the lowest you can go.

A spring that have to little pretention would easier give problemes with boostcreep and will give slower boostresponse. A really good boostcontroller can somewhat make up for it though.

I'd say a 1bar spring should work good for running a dailiy 14-20psi, and turning up to 22-29 for track...