Is there a "maxiumum" suggested limit to the amount of boost you can run above your wastegate spring rate?

I want to run lower boost around town (say10-12 psi), but with racegas at the track I would like to turn it up to approximately 25psi or more, I'm wondering if a lower rated spring will have issues at that high of a pressure.

Thank you

-mark

 

i've heard 2x the spring is the max

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Wo-Nelly &raquo;</TD></TR><TR><TD CLASS="quote">i've heard 2x the spring is the max</TD></TR></TABLE>

That's what I've heard as well.

 

if you run twice the spring rate, use the top port of the wastegate in conjunction with your boost controller.

 

From what ive seen its about 15psi over the rating of the spring. a 10lb spring in a tial wastegate will start to flutter about 25psi of boost..

The reason this happens is because the pressure in ur exhaust manifold gets so high that the boost pressure on top of the wastegate that holds it closed is not able to overcome the opposing pressure trying to open it.. This causes the wastegate spring to open and close irratically, or "flutter."

 

how about lower?

say a 1.0 bar spring... can you go lower boost?

 

Can't go any lower than the spring you have in the WG. That will be the minimum boost you can run.

Craig

 

Well, I guess switching springs for race days and daily driving isn't too much of a hassle

thanks for the in formation

-mark

 

actually i was told you can lower the boost, by putting T's in the vac line and bleeding off the boost.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by itr206 &raquo;</TD></TR><TR><TD CLASS="quote">actually i was told you can lower the boost, by putting T's in the vac line and bleeding off the boost.</TD></TR></TABLE>

That wouldn't be wise...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by itr206 &raquo;</TD></TR><TR><TD CLASS="quote">actually i was told you can lower the boost, by putting T's in the vac line and bleeding off the boost.</TD></TR></TABLE>

Think about that for a second. What's the difference between blocking the vacuum line (like a boost controller does) or bleeding the boost out of the line with T's? Either way the wastgate actuator is seeing less boost in the line, and will not open. (generating more boost, not less)

You can't run less boost than the sping is rated at, unless you can keep the gate door slightly open at all times (like an adjustable internal wategate)

 

It would be a vacuum leak... Unless it's coming off the turbo(pressure hose, not vacuum).

 

OMG something else for me to get confused about!!!!!!

i am running 12 psi on a delta gate wastegate with a 7 psi spring. below is a picture showing what the setup of the wastegate is curently at. are you guys telling me that when i go to the dyno again and shoot for abour 450 at possibly 20-25 psi that the current wategate setup u see in that pic is not going to work? if not then what do i have to do to make it work?

PS. dont make fun of my mad MS PAINT SKILLZ

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nextelbuddy &raquo;</TD></TR><TR><TD CLASS="quote">OMG something else for me to get confused about!!!!!!

i am running 12 psi on a delta gate wastegate with a 7 psi spring. below is a picture showing what the setup of the wastegate is curently at. are you guys telling me that when i go to the dyno again and shoot for abour 450 at possibly 20-25 psi that the current wategate setup u see in that pic is not going to work? if not then what do i have to do to make it work?

PS. dont make fun of my mad MS PAINT SKILLZ

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

anyone?

 

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

anyone?</TD></TR></TABLE>

get a spring thats rated at 1 bar... but do that after you get rid of that hunk of dogshit deltagate ....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Derek14 &raquo;</TD></TR><TR><TD CLASS="quote">

get a spring thats rated at 1 bar... but do that after you get rid of that hunk of dogshit deltagate ....</TD></TR></TABLE>

thanx for your input but im sticking with my deltagate. it has served me 100 percent with no problems what so ever. i have seen many tial wastegates take a dump like many deltagates have as well.

anyone else know what i need to do besides getting a bigger spring?

 

You will need a bigger spring bro. Your car will build boost faster also with a bigger spring.

And trust me i was on the Delta Gate bandwagon for awhile,but that thing is a piece of ****!!! I used to think everyone was lieing about the delta gate being a piece of ****,but trust me once you have one stick on you and your car boost 35+ psi and blows the head gasket(which happened to me) or even worse if you are using a stock sleeved motor and it blows the sleeves completely out of it. You will wish you would have used a TIal.

I just bought a Tial 38mm HP from NOLMITMOTORSPORT, and i love this thing man. I got mine with a 20psi (1.3BAR) spring and my car builds boost amazingly faster than what it did with the delta gate.

Just a thought for you bro,

Brian

 

yea but if i get a boger spring like a 20 psi spring like you did. then i am forcesd to run 20 psi as my minimum boost. i dont want that. on the street i like to ride a conservative 7-10 psi.

 

yes you are correct. but you dont have to buy a spring. I ran 25psi on my delta gate. Which only had a 7psi spring in it.

I am not sure what you boost goals are,but i am sure you will be able to make 400+ on this gate with a boost controller.

HTH
Brian

 

right now im running a greddy profect b spec II and it controls boost fine with a lo setting of 8 psi and a Hi setting of 13 psi.


i am going for 450-500 @ 20 psi but i read at the top of this post that to run that muc higher above the stock spring in the wastegate ( any wastegate) that you have to change the way you run vacuum lines from the wastegate. thats why i posted a pic of my wstegate and how it is setup in hopes that someone on here would be able to tell me what to change ....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nextelbuddy &raquo;</TD></TR><TR><TD CLASS="quote">right now im running a greddy profect b spec II and it controls boost fine with a lo setting of 8 psi and a Hi setting of 13 psi.


i am going for 450-500 @ 20 psi but i read at the top of this post that to run that muc higher above the stock spring in the wastegate ( any wastegate) that you have to change the way you run vacuum lines from the wastegate. thats why i posted a pic of my wstegate and how it is setup in hopes that someone on here would be able to tell me what to change ....</TD></TR></TABLE>

Well just to let you know, i have my vacuum lines just like yours and i have run 25psi on the delta gate with that setup.

You dont have to change any of your vacuum line routing.

Brian

 

When you guys with the high pressure springs are at the dragstrip, how is first and second gear with that much boost? I was shooting for a lower pressure spring because I wanted to run lower boost both on the street and lower gears, and then crank it up for third gear onward.

-mike