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Registered
Join Date: Jan 2007
Location: Wichita
Posts: 81
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double wastgate springs?
I have been reading 1.1 to 1.2 on my vdo boost gauge so I figured I had a bigger spring install.
I disassembled the wastegate and found two springs inside. Both about 6.25" in length. I want to get back to .8. Should I simply take the inner spring out and just go with the outer Spring? Maybe it was stock? |
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06-05-2009, 06:21 PM
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beancounter
Join Date: Jan 2008
Location: Weehawken, NJ
Posts: 3,593
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I don't think that is stock, although I also found two springs when I took apart my wastegate to troubleshoot a similar overboost condition. You can try it with the single spring and try bench testing it by pressurizing the boost signal hose with a bicycle pump or air compressor. I found that with two springs, the wastegate wasn't opening at all...even with well over 1 bar. Thankfully I think the stock turbocharger runs out of breath at about 1.1 or 1.2 bar. With only spring, the wastegate leaked boost pressure from the valve stem and I could only get about .5 or .6 bar. New wastegate was the solution for me.
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Jacob Current: 1983 911 GT4 Race Car / 1999 Spec Miata / 2000 MB SL500 / 1998 MB E300TD / 1998 BMW R1100RT / 2016 KTM Duke 690 Past: 2009 997 Turbo Cab / 1979 930 |
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06-05-2009, 06:39 PM
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Manassas, VA
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WG Springs
These are for a 965, but you get the idea.
 Mark
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1991 964 Polar Silver Metallic Turbo Coupe |
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06-05-2009, 08:00 PM
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Registered
Join Date: Oct 2003
Location: Mount Pleasant, South Carolina
Posts: 14,561
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The stock wastergate uses one spring. A Tial wastegate can use one or two springs depending on what level of boost you want.
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06-05-2009, 08:03 PM
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Registered
Join Date: Aug 2007
Location: The Golden State
Posts: 1,533
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Quote:
If so, this is a pic of a single 1bar stock WG spring, if you need a stock .8 bar spring...PM me, I know someone that has plenty of them. 
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Rod... 2010 - 997 PDK, Black on Black, Daily driver. 1987 - 930 Grand Prix White, Not looking for crazy HP, just harmony! |
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06-05-2009, 09:02 PM
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Turbo Hooligan
Join Date: Sep 2007
Location: The Old World
Posts: 1,234
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my tial uses two, the outer spring is .7 bar and the inner spring is .3 bar technically it should yield 1 bar but translation is lost somewhere as I use that setup for 17lbs of boost, I'll take out the smaller inner diameter spring and it only runs 10lbs.
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D-Zug  |
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06-06-2009, 04:11 AM
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Registered
Join Date: Jan 2007
Location: Wichita
Posts: 81
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Yes, my WG is stock. Thks for the input. I have one that I bought off of ebay. It has a yellow mark on it. The seller claims it is a .8 stock spring. It measures 7.5" in height. I thought all of the .8 stock springs were 6.25"?
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06-06-2009, 11:36 AM
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Banned
Join Date: Nov 2007
Location: Rockwall, Texas
Posts: 8,559
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The spring in my OEM wastgate, which I assume is stock, measures 71mm (just under 7") in height . . .
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06-06-2009, 12:40 PM
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Registered
Join Date: Apr 2008
Posts: 138
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I have a yellow Tial spring here on my desk and it measures 11cm.
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Joe --------------------------- 91 C2 Turbo, K27 7006, headers, Greddy EBC, 1bar |
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06-07-2009, 12:04 AM
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1991 Porsche 964 Turbo 3.3L
