Boost springs

[fredmeister]

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

[cl8ton]

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.

[mdurbahn]

My nib 1 bar spring is 6.75" long

[NathanUK]

Measure the wire diameter, I'm gonna guess it's thicker.

[benzyne]

Originally Posted by ben parrish

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.

[ben parrish]

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.

[benzyne]

Thanks.