Wastegate Vacuum Plumbing/Aftermarket Turbo

[steeda763]

Hi there...Since there are no introduction forums I'll jump straight into it: I just bought a riced-out, beater '98 GST with what I suspect is an SS Autochrome 16g turbo, and I'm trying to reverse-engineer many, many things.

One thing I'm looking at is the vacuum line between the wastegate and the stock boost solenoid because it has a Tee, which goes to an aftermarket intake (after MAF, before turbo inlet). The other side of the stock solenoid is connected directly to the compressor housing. This looks wrong...way way wrong.

Would it be correct to the do the following?: Connect wastegate actuator directly to stock solenoid, then stock solenoid to compressor housing, and plug the aftermarket intake nipple? If not, suggestions would be absolutely welcomed!

 

[tbonitz301]

If you cant find any help i would use the search button its a wealth of info. Personally im not sure, but im sure you will find what your looking for And there is actually a very detailed intro that will tell you everything you need to know.

 

[steeda763]

I was looking for a really specific answer, but I did find a 16G install FAQ (16G install in a 2G) confirming that the turbo compressor housing was positive pressure (duh). The nipple on the aftermarket intake still has me baffled, but the way I have it seems to be working.

 

[bboyalan]

hey there,

the solenoid DOES have a line between it and the intake piping [after maf and before turbo inlet]. also, the "tee" SHOULD be between the same solenoid [2 lines on solenoid, excluding the electrical], wastegate actuator, and compressor housing. so....

intake
^^
solenoid
^^
T-splitter << compressor
^^
wastegate

i hope that helps! if not, just let me know and i can take a quick snapshot for you. goodluck!

 

[Mr Peepers]

bboyalan's got it. Can I ask what boost you were running with that previous setup? (from the aftermarket boost gauge, not the inaccurate stock one)

With how it was setup before, it seems like it would run open boost...

p.s. if you just wanted to be safe, you could run a line directly between the pressure source and the WGA.