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Old 09-10-2009, 01:58 PM   #1
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Question Wastegate spring... Lower or higher

At this time i am using a boost controller to push 15 psi,
if i do a change of my 3.5 spring in my wastegate for a 11.6psi spring,
you think it would work better?
I mean... my boost can drop less?
or is the same thing by using a boost controller?


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Old 09-10-2009, 03:34 PM   #2
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a good rule of thumb when selecting WG spring rates it that the psi generated is about 2x the spring rate, so going to an 11.6 spring rate would actually give you 23.2psi and no lower. that would probably be a bad decision considering that you are only running 15psi and probably don't have the tune/supporting mods (i.e. injectors and such) to support the higher boost levels.

my suggestion to you would be to just get maybe a 6-7 spring rate and use the BC to adjust from there so that you can still get the higher boost levels with less drop off.
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Old 09-10-2009, 03:52 PM   #3
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I have a dual manual boost controller, i try to let the stage 1 using the 11.6 spring, in the second stage i try to turn up the boost to 15psi, what you think about it?
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Old 09-10-2009, 05:36 PM   #4
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So your saying for first stage you just let the spring in the WG control boost, but second stage you let the MBC control your boost?
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Old 09-10-2009, 05:56 PM   #5
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Yes it is....in the first stage just let the wg spring works and in the second stage turn up the boost to 15 psi
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Old 09-10-2009, 07:19 PM   #6
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Quote:
Originally Posted by focusfreak03 View Post
a good rule of thumb when selecting WG spring rates it that the psi generated is about 2x the spring rate, so going to an 11.6 spring rate would actually give you 23.2psi and no lower. that would probably be a bad decision considering that you are only running 15psi and probably don't have the tune/supporting mods (i.e. injectors and such) to support the higher boost levels.

my suggestion to you would be to just get maybe a 6-7 spring rate and use the BC to adjust from there so that you can still get the higher boost levels with less drop off.
That's not how wastegates work, lol. If you run off of an 11.6# wg, then you will run 11.6 psi. The rule of thumb you are thinking of is you only want to boost a maximum of 2x what your wg is rated at. So with an 11.6# spring, using a boost controller, you would only want to go as high as 23.2#.
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Old 09-10-2009, 10:05 PM   #7
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you're right. i must have been thinking of something else. thanks bro.

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san antone huh? what do you do? how do you like it there? i'll be getting out in a couple of months and moving to colorado.
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Old 09-11-2009, 06:30 AM   #8
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I'm in info ops, doin...stuff, heh.

I like SA, especially now that it's dropped below 100* during the day. Down to low 90s, high 80s. It's nice.

To the OP, if you're planning on running over 15# anytime soon, 3.5# wg spring sounds small. Are you positive that you want to run a minimum of 11.6#, though?
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Old 09-11-2009, 08:06 PM   #9
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Lets try.... to see how it works....

Updates coming
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Old 09-14-2009, 02:36 PM   #10
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Was done, It drop the boost more than before, maybe to 1 PSI ..i will try it again using the boost reference to the turbo, not to the IM.
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