quick question - testing wastegate spring

[l1ttle_d3vil]

is there any way of checking what sort of spring an external wastegate is running, other than fitting it to a vehicle and checking what boost it reaches?

cheers
-matt

[ChaosAD]

a small hand pump and gauge?

[Adydas]

I that an answer or a guess?

Google say...

Wastegate Testing

Wastegate testing must be done with the exhaust system initially cold.
Raise the vehicle on jack stand.
Disconnect the wastegate actuating line for the wastegate and connect a pressure pump.
Start the engine an allow it to idle. The exhaust line to the wastegate should heat up after a short period of time. However, if the wastegate is closed and not leaking by, the bypass line out of the wastegate will be cold.
Using the pressure pump slowly apply pressure to the wastegate while feeling the bypass line.

NOTE

Never apply more that approximately 14.5 psi (1 bar) pressure to the wastegate diaphragm during testing. The factory shop manual says to apply 0.6 bar (8.7 psi) of pressure to the wastegate to get it to open. However, the pressures listed below are based on actual numbers from two different 944 Turbo owners who independently tested their wastegates and came up with the same results.

At a pressure of approximately 4 psi (0.2 bar), the wastegate should start to open as indicated by a temperature increase in the wastegate bypass line. At a pressure of approximately 7 psi (4.8 bar) the wastegate should be fully open. Of course, you won't be able to see the exact position of the wastegate if you are testing it in place. However, you can check actual position of the valve during a bench test.
When the pressure is suddenly removed, the wastegate should close as indicated by an audible click.

Perhaps worth trying..

[l1ttle_d3vil]

thanks for the info, but the wastegate isn't on a car at the moment... just wondering if theres a way to test it while it isnt fitted.

[Adydas]

i dont Think you need to have it on a car persay my understanding of that would be its better to but as said above with the right gear you should be able to pull it off without it been fitted.

either way id take it to a shop.. THey might just know some trade secret like x amount of coils in the spring indicates x.

[matt dunn]

If it's a genuine Tial you can tell by the colour and size of the spring.

[flygt4]

standard fitment for a tial is usually 0.7 bar unless you ask for something else.

[l1ttle_d3vil]

If it's a genuine Tial you can tell by the colour and size of the spring.

yes it is, any more info?

and whats 0.7 bar in psi for a dummie like me?

[Burning Angel]

1 bar = 14.7 psi afaik

so .7 bar = .7 * 14.7 =10.29 psi

[matt dunn]

SIZE Color BAR PSI

small yellow 0.25 3.63
small red 0.4 5.8
small green 0.5 7.25
small blue 0.6 8.7
big yellow 0.7 10.15
big red 0.8 11.6
big green 0.9 13.05
big blue 1 14.5


and you can add two together to make more,
i.e. a big red with a small blue inside is 11.6+8.7 = 20.3 psi

[l1ttle_d3vil]

very interesting, thanks for that matt.

faq anyone?