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Jerry S's Avatar
 
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Wastgate Spring sizes

Is there a way to tell what boost one may get from a given wastegate spring. I came across a spring in my boxes of goodies but can not tell if it is good for 1 bar or stock 0.8. I know tension is an obvious factor but height is also.

The unit I found measures exactly 8 inches in length.

Any ideas without going throught the trouble of actually installing it ??
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Old 09-23-2008, 07:01 PM
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Ive got a one bar on the counter that i could measure for you but the brands may be different (got it from pelican parts).
If you would like me to just let me know here.
Old 09-23-2008, 07:45 PM
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It is more the thickness (spring rate) of the "coil" than the lenght that establishes the boost control.
Old 09-23-2008, 08:06 PM
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Mark I went through this a while back here ->Boost springs

fredmeister went out of his way to take some measurements for me, which helped me in the end!
See if any of this can help.
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Old 09-23-2008, 09:24 PM
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This I pulled from a previous post :

Ok here are the measurements I took today:
1) First the 0.8 bar stock spring--------
Spring Length = 7.0 inch
Outer diameter = 2.70 inch
Number of effective coils = 5.5
Wire diameter = 0.196 inch
Installed height in WG = 2.5 inch
Measured spring rate = 22lb/inch
2) Now the 1.0 bar spring----------
Spring Length = 7.25 inch
Outer diameter = 2.70 inch
Number of effective coils = 5.5
Wire diameter = 0.212 inch
Installed height in WG = 2.5 inch
Measured spring rate = 27lb/inch



:I remeasured my spring again and found that it is approximately 7 coils, stands 8 inches tall with no weight and when I placed a 25 lb weight on top it compressed it 1 inch which would suggest that it is a rate of 25lb/in. I am still unsure since these numbers do not seem to correspond to any of "Fredmeisters" test results.
Any other opinions ?
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Old 09-24-2008, 07:30 AM
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How accurate did you measure everything?
You need to use calipers to measure the inner diameter and spring wire diameter.
The spring length is from flat to flat that is machined on each end of the spring.
The only variable that I measured possibly inaccurate because of the scale I used would be spring rate. I did not use a calibrated scale....but probably close enuff.
I did not use an actual weight and measure compression change.....but sounds like you are closer to 1.0 bar than 0.8.
Won;t know for sure until you compare to my other numbers as from my previous post above.
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Old 09-24-2008, 02:08 PM
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Thanks Fredmeister,

Yeah I am thinking that I may have a 1 Bar spring. My old one is the same coil diameter and thickness however the old one is about 1.5 inches shorter both standing on a flat surface. I just hope it is not like a 1.1 or 1.2 bar.
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Old 09-24-2008, 03:01 PM
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May I ask why your interested in knowing what the spring is rated at?

There are simpler ways to control the amount of boost your looking for?
And you don't have to take the W/G apart. If that is the reason...
Old 09-24-2008, 05:38 PM
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I had a spare WG spring and I was thinking about upgrading from stock boost. I do run a Garretson intercooler and only drive the car on the street. Then I started to measure and compare. I then pulled the old unit and found it to be different. I just want to make sure that it is not more than 1 Bar.
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Old 09-24-2008, 09:25 PM
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I know there is mixed reviews on regulators, but i installed one last week and i could not be happier.
Now i have the option to turn it down to .7 bar all the way to 1.2 or even higher.
It took about 1.5 hrs to install. And you keep the stock spring in.
I installed it around the engine so no one would play with it.
I got it off of ebay...slight mod then on.
Jegs sell the same one as-well.
http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItem&rd=1&item=230284410536&ssPageName=STRK:MEWN:IT&ih=013

Just thought you should know.
Old 09-25-2008, 08:29 AM
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Jerry, by what you've stated It may well be more than 1bar so be careful with it.
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Old 09-25-2008, 10:20 AM
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Before I post a new thread, anyone here have a stock .7 - .8bar spring they could part with, or trade for my 1.0b?
I'll be putting my car back together with 8:1, 964 cams and port&polish, and won't DARE push 1 bar until it's electronically controlled with EFI.

Thanks!
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Old 10-02-2008, 09:58 AM
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