I need to know If a wastegate spring will only support boost for twice it's weight? For instance, i was told that you if you had a 10lb spring the max you could get out out of the spring is 20lbs of boost. Is this true? Any help would be greatly appreciated.

 

NO Ive run 8psi spring at 28psi.Depends on how good of waste gate.

 

generally it is 2.5 rule of thumb. while you can doi it, consistency is sacrificed.

 

ive ran a 7psi spring up to 28psi before...

 

a bigger spring will lock more tighter and give u better spool time. a small spring will be constantly try n to regulate that boost. if ur building a track car, just run like a 15-20 lb spring

 

It depends on your turbo system and how efficent things are working.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boostedcivicsir &raquo;</TD></TR><TR><TD CLASS="quote">generally it is 2.5 rule of thumb. while you can doi it, consistency is sacrificed.</TD></TR></TABLE>
Can you elaborate? 2.5 times the boost pressure or 2.5psi above the spring.

 

there is no rule of thumb on this. it depends on your spring wastegate, manifold design, turbo, exaust....

 

i would keep the wastegate spring rate as close as i could to the amount of boost that i would be running.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Fo-Do Fanatic &raquo;</TD></TR><TR><TD CLASS="quote">i would keep the wastegate spring rate as close as i could to the amount of boost that i would be running.</TD></TR></TABLE>

unless you want to run 30psi on the top end.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jared &raquo;</TD></TR><TR><TD CLASS="quote">

unless you want to run 30psi on the top end.</TD></TR></TABLE>

i dont even think tial makes any spring bigger than the 14.5psi spring, and thats only for the 38mm.

the 44's and 46's only go to 12.5 i believe lol.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Fo-Do Fanatic &raquo;</TD></TR><TR><TD CLASS="quote">

i dont even think tial makes any spring bigger than the 14.5psi spring, and thats only for the 38mm.

the 44's and 46's only go to 12.5 i believe lol. </TD></TR></TABLE>

you can use more then one spring


to the original thread starter, Just try your system out and see what works for you, what works for one guys might now work for your setup.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by miller &raquo;</TD></TR><TR><TD CLASS="quote">

you can use more then one spring
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ohhh so thats why they have a small and a large spring

 

Most boost controllers control the wastegate by "controlling" when and how much boost it sees. So what difference does it make what spring you have?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Muckman &raquo;</TD></TR><TR><TD CLASS="quote">Most boost controllers control the wastegate by "controlling" when and how much boost it sees. So what difference does it make what spring you have? </TD></TR></TABLE>

because exhaust manifold pressure will push the spring open and some turbos will max out before others.

 

thats what i would go by... x2 of original pressure

 

unless you use a boost controller that over comes that exhaust backpressure by applying to the control port of the wastegate. With this type of control you can run a 4 psi spring and still make as much boost pressure as the turbo can support

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NLR &raquo;</TD></TR><TR><TD CLASS="quote">unless you use a boost controller that over comes that exhaust backpressure by applying to the control port of the wastegate. With this type of control you can run a 4 psi spring and still make as much boost pressure as the turbo can support</TD></TR></TABLE>

if you are using co2 or some kind of pressure source greater than the intake manifold pressure. and this all depends on the setup as well.

 

It doesnt matter what your pressure source in relation to your intake manifold pressure is, thats irrelevant. As long as your co2 pressure is higher than backpressure and you have the capability of applying what ever it takes to get to the pressure level you want then your golden. All the variables that would normally have a say so in total boost pressure are eliminated with this control strategy. It doesnt matter what your set up( as long as its an external gate) is you can run a 4 psi spring and with an ams-1000 it can extract everything that turbo has to offer.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NLR &raquo;</TD></TR><TR><TD CLASS="quote"> It doesnt matter what your pressure source in relation to your intake manifold pressure is, thats irrelevant. As long as your co2 pressure is higher than backpressure and you have the capability of applying what ever it takes to get to the pressure level you want then your golden. All the variables that would normally have a say so in total boost pressure are eliminated with this control strategy. It doesnt matter what your set up( as long as its an external gate) is you can run a 4 psi spring and with an ams-1000 it can extract everything that turbo has to offer.


</TD></TR></TABLE>

is that with the pressure reference from turbo? or co2?
and to asnwer the questio above to me, i was told, cant remember my sources, 8lb spring should be good for 24. 2.5 x base. thats what i was told when i asked. dont shoot the messenger.

 

With C02!
C02 should be used for any drag application. Quicker response and the ability to do things you cant do with manifold pressure as the source. One, being able to over come back pressure the other being able to manipulate the gate to control turbine speed in ways others cant

 

so you mean to pressurize the top of the top of the wastegate to get the desired boost levels i want. So 8psi spring can support 40psi if done correctly?. That AMS 1000 is like $1000 also?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tagperformance &raquo;</TD></TR><TR><TD CLASS="quote">so you mean to pressurize the top of the top of the wastegate to get the desired boost levels i want. So 8psi spring can support 40psi if done correctly?. That AMS 1000 is like $1000 also? </TD></TR></TABLE>
yes


street apps should not go above 2x spring pressure

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TiAL &raquo;</TD></TR><TR><TD CLASS="quote">
yes


street apps should not go above 2x spring pressure</TD></TR></TABLE>

this man knows his chit

 

for example, i have a 6psi spring in my wastegate. i used a ebay/horrible manifold for a lil while. and i have now changed to SLS ram manifold and when i did so, when i turn off boost controller, my wastegate now runs on 4psi. imagine that!

but is still ultimately controlled by my boost controller.