W.t.b. .5 bar spring

[TIM.G 911]

NEED A .5 BAR SPRING FOR FACTORY 930 WASTEGATE,

CAN SOMEONE HELP ME?



911 turbo project well underway!

[cole930]

Tim,

The only place you will find one is in a early 924 turbo wastegate. Same wastegate as 930 lower spring pressure.

924 Turbo 1979 - 1982 (USA)

(2) Springs available
.43 Bar / 6.2 PSI
.47 Bar / 6.8 PSI

924 Turbo 1979 - 1980 (ROW)

(2) Springs available
.67 Bar / 9.9 PSI
.73 Bar / 10.6 PSI


924 Turbo 1981 - 1982 (ROW)

(2) Springs available
.62 Bar / 9 PSI
.68 Bar / 9.9 PSI


Cole

[gsmith660]

Oh now you put this out I had a stock wastegate I was trying to get to a lower boost pressure and ended up getting a tial cause of the firestorm of discussion about a .5 bar spring was not available. LOL

[TIM.G 911]

Cant find a spring! You were better off with the tial!

[gsmith660]

Originally Posted by TIM.G 911

Cant find a spring! You were better off with the tial!

You can go to the parts diagram here on PP and get the part number then most likely can order it from our host.

[gsmith660]

I looked in the pet and didnt see it but if you call PP they will be very helpful to locate the part

[TIM.G 911]

Our host could not help, still working on it.

[pdqcarrera]

I thought stock was a 0.6 bar spring? That's what my old stock one has.

[cole930]

While researching boost springs there was mention of a .6 Bar spring on early non IC 930's. I was never able to confirm that but that doesn't mean it wasn't true. Just tried to post what I could validate.

Here is a .47 Bar 924 Turbo spring (left) and a .8 Bar 930 spring (right)






Cole

[TIM.G 911]

How much for the one on the left?

[cole930]

Tim,

It's not for sale.

Cole

[TIM.G 911]

Cole, I figured it was worth a try! The way it looks now I will be working/machining on my .9 bar spring to get what I want.

[ben parrish]

Cole, can you measure the .47 bar spring diameter and height? There are a few sources for springs that we may be able to use if we knew the exact measurements.
thanks,
Ben

[gsmith660]

You might try th dismantlers for 924 turbo wastegate but not likely to find

[cole930]

TIM:

In an earlier thread Fredmeister suggested machining a spacer for between the mounting base and the spring cup. This would decrease the spring pressure.
He figured it would need to be between 20-25 MM.


G Man:

Most used 924 wastegates do not have the original springs in them. Bob a DC has 924 turbo wastegetes at $200 each.


Mr. Ben:


6 Active coils:

2 Dead Ends:

Space between active coils: 13/16 inch

Overall length including Dead Ends: 4 3/4 inch

Coil Diameter: 2 5/8 inch

Wire Diameter: 7/32 inch


Cole

[ben parrish]

Schaweeet. Will post my findings.

[cole930]

We are all screwing around with these wastegates trying to get the right combination for our particular application and I imagine everyone is going to be taking one apart sooner or later. Or you might be an old fool like me and do the best with what you have. I'm old school and hate to think about $600 bucks for a 50MM Tial. Don't have anything against Tial but the 930 wastegate has won Le Mans 7- 8 times in everything from a RSR to a 962 seems like it should be a good bet for my street car.

As you know I'm putting together a couple wastegates for the old sled and thought there might be a few things that could be helpfull to others. I have purchased a couple 924 Turbo springs and had an old wastegate I needed to clean up to make my spare. Typically these wastegates are pretty hardy but the most common issues are failures because of bad diaphrams, broken springs, burnt up castings, lost valve seats, and worn guides. I have 3 or 4 wastegates I've picked up over the last 30 or so years and they really come in handy for spare parts. Bad valve guides and burnt up castings are the hard ones to do much about but most of the used ones I have all worked or had servicable parts.
I've repaired quite a few diaphrams with worn spots by cutting a small circle of duct tape for over the hole and then putting a thin layer of black silicone over the inside and the outside of the patched spot, works great and saves a $100.

Nice little wastegate drawing:





Here we go on building the spare:





The valve and seat installation is very important, make sure you don't throw away or loose the seat. It is attached on the threaded studs that bolt the wastegate to the exhaust. Many have mistaken the seat for a spacer and discarded it. Be sure the seat is in place correctly when installed. The seat needs to be pulled into place as the wastegate is installed on the exhaust. The seat actually sets on the valve head and upon installation will push the valve up into the casting body as the seat centers itself inside the casting during assembly to create a proper initial seal. If this is not done correctly you will have boost leak and a gap between the seat and the casting





Look carefully at the aluminum casting that is the base for the diaphram and note the raised inner edge, the diaphram must be seated over the raised edge to help the seal in place when the spring hat is installed. There is a matching groove in the spring hat that fits over the edge of the diaphram, this seals and holds the diaphram in place so it can inflate properly.











Here is our spare wastegate:





Cole