Wastegate Creep

tuckertrucker
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Location: Kerikeri

Wastegate Creep

Postby tuckertrucker » Wed Nov 01, 2017 6:57 pm

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
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Re: Wastegate Creep

Postby sirLachlan » Sat Nov 04, 2017 8:06 am

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
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Posts: 106
Joined: Sun Apr 03, 2016 8:28 am

Re: Wastegate Creep

Postby sirLachlan » Sat Nov 04, 2017 8:17 am

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

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tweake
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Re: Wastegate Creep

Postby tweake » Sat Nov 04, 2017 9:01 am

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

tuckertrucker
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Posts: 154
Joined: Tue Sep 01, 2015 10:59 pm
Location: Kerikeri

Re: Wastegate Creep

Postby tuckertrucker » Sun Nov 05, 2017 11:25 am

cheers fellas, will have a read

slidenyo
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Re: Wastegate Creep

Postby slidenyo » Thu Nov 16, 2017 6:13 am

External gate? Or internal.
If it were internal could be actuator preload
problems are only a problem if you not willing to learn how to find solutions

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