Wastegate Creep

[tuckertrucker]

Gidday all
I've had a good search but nothing on this (or others) forum that covers exactly what I'm asking.
I've got a 92 Safari running a GT35 turbo. Nothing, flash. My set up allows around 14psi using a 38mm wastegate. Unregulated the old girl can only reach 20psi.

Currently with the wastegate plumbed in, it begins to creep open at around 5psi. I can still reach the 14psi but not till around 3500rpm. If I take off the pressure line to the wastegate, I can reach higher pressures earlier.

Are there any ways to prevent this creep while maintaining the function of the wastegate to keep the boost capped at 14?

cheers

[sirLachlan]

Read this to do it properly
Also it's worth finding the "part two" of that article on same page
http://www.autospeed.com/cms/article.ht ... 1&A=111348

The other option is just use a longer piece of vacuum hose to go to the actuator . Like actually just use a metre of hose and coil it up . See if that makes a noticible difference and it only takes 5 seconds to fit/try . Vl commodore owners do it quite often

The top link is thecnically correct and very diy and tunable for a professional result short of going to an ebc

[sirLachlan]

http://www.autospeed.com/cms/article.html?&A=111350

So in short get a low pressure adjustable relief valve and get a small one way valve .
The relief valve might cost some money . T fittings and hose and a check valve all should cost a few dollars each . Plenty of petrol cars have 5mm check valves for stuff in the vacuum system

[tweake]

simply get a ball and spring boost controller.
eg http://nxsmotorsports.com/
plenty of info around if you want to make your own.

[tuckertrucker]

cheers fellas, will have a read

[slidenyo]

External gate? Or internal.
If it were internal could be actuator preload