Thread: Boost springs
View Single Post
fredmeister fredmeister is offline
Smart quod bastardus
 
fredmeister's Avatar
 
Join Date: Oct 2002
Location: Baltimore, MD, USA
Posts: 2,238
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

__________________
1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, full bay intercooler, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.95 bar 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)