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Smart quod bastardus
 
fredmeister's Avatar
 
Join Date: Oct 2002
Location: Baltimore, MD, USA
Posts: 2,235
Garage
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

This should give you enuff information to order a custom spring if you do not find an OEM unit.
From my calculations......at installed height in the Wastegate, the 0.8bar spring force required to pop the valve is about 101 lbs. for the 1.0bar spring it is 124lbs.

Good luck


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1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, B&B intercooler, Snow Perf water/meth injection, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.7bar max
---"When you're racing it's life! Anything else either before or after, is just waiting"

Last edited by fredmeister; 03-08-2008 at 10:46 PM..
Old 03-08-2008, 10:42 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #21 (permalink)
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cl8ton's Avatar
 
Join Date: Aug 2007
Location: The Golden State
Posts: 1,533
Fred thank you for the specs!
I can see you spent some time in getting this information and I appreciate it!

Appears my spring is stock!

Thanks to everyone for their input.
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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!
Old 03-09-2008, 12:21 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #22 (permalink)
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Join Date: Aug 2007
Location: Denver CO
Posts: 294
My nib 1 bar spring is 6.75" long
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1979 930 Euro
50k:Lindren Green:B&B Dual Out Pipes:K27:965 I/C: --SOLD!!
Old 03-09-2008, 10:09 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #23 (permalink)
A fellow Pelacanite
 
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Join Date: Nov 2006
Location: UK
Posts: 2,002
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Measure the wire diameter, I'm gonna guess it's thicker.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

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Old 03-09-2008, 01:38 PM
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Drivin' Miss Daisy
 
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Join Date: Aug 2006
Location: Vancouver, Canada
Posts: 272
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Quote:
Originally Posted by ben parrish View Post
Sorry I can't help you. I have also tried to find a softer spring with no luck.. I did consider taking out my stock spring and measuring the diameter and length and then trying to order a generic spring with the same diameter but shorter length to see what happens. The springs are pretty cheap online; simple compression springs. I did find a few sites that offered numerous springs; you just plugged in the parameters and it would tell you what spring you needed. Here is one site. Lee Spring - Lee Spring - Precision Stock & Custom Springs

Let me know if you go this route.

Ben
Ben, did you end up getting a spring from Lee Spring? I might go this route.
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58 VW Split Window Bus - Porsche Powered
78 911SC Turbo Look - Megasquirt II, EDIS, 964 intake
92 964 Turbo
Old 11-06-2010, 02:43 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #25 (permalink)
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Join Date: May 2002
Location: Georgia
Posts: 2,733
No, I found a .7 spring and bought it...still on the shelf as I havn't done the conversion yet. I might get to it this winter. I've been having too much fun driving the car to want to work on it.
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1986 3.2 Carrera
Old 11-06-2010, 05:34 PM
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Drivin' Miss Daisy
 
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Join Date: Aug 2006
Location: Vancouver, Canada
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Thanks.

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58 VW Split Window Bus - Porsche Powered
78 911SC Turbo Look - Megasquirt II, EDIS, 964 intake
92 964 Turbo
Old 11-06-2010, 08:29 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #27 (permalink)
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