Iv got a qusestion for all you clever datophiles Iv got a external waste-gate on my datsun turbo and I want to reduce the boost.
I bought the smallest sternal gate i could find (a 38mm trust replica from china) and it works fine, but I want to reduce boost pressure it seems to keep about 10-12 psi on my motor.
I want to reduce the boost pressure down to about 5-6 psi.
Im thinking of putting the spring in a vice so its fully compressed and then heating the spring to de-temper it.
I think that it going to be tricky to heat the spring to a hot enough temp to re-temper it so i thought id ask you fellow datophiles.




Any Ideas?

Sounds like you might end up with a coil of wire rather than a spring. You're probably better off trying to find a softer spring of the right dimensions.

Do you think that the spring will staighten out(de-coil)? or just end up too soft?
The spring is about 55-60 mm round and about 150-160 mm long with about 5-6 coils so it a bit of a rare bird when it comes to finding one and I dont want to spend any money, the stenal gate cost me $90.00(brand new, on my door).

You will wreck the spring if you attempt to heat it. The mechanical properties will change and the changes will be inconsistent so best not to try this at home. Find the right replacement spring. Search for spring suppliers online. I think "Precision Springs" would have what you need and it shouldnt be too costly.

If you compress the spring in a vice and de-temper it, it will probably stay in it's compressed shape ie. it won't spring back out. Maybe.

what about if you just cut one or two coils off of it might take a bit of pressure off of it ?? not sure if it will work or not?

Yeah i thought of that but all that will do is increse the spring tension and reduce the stroke (so iv been told) of the waste gate thanks for your thoughts

lengthen actuator rod