I just got a free turbo from one of my friends. It’s maxpeedingrods GT2871 and it’s brand new. I know it’s cheep and not that great but it’s still free. I have 3 questions
1: what is the stock wastegate spring/pressure can I change this and how do I do so
2: it came with this bolt that has a funny hole through it (circled in picture) what is it and where does it go
3: which ports are the water inlet and oil inlet and same goes for outlets

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I think that’s a banjo bolt for the oil feed.

 

A picture of your actual turbo would help. Does it have 2 threaded holes in the center section or 4?

 

It has 4

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In your pic from the ad, the port facing up with the small id is the oil feed. Like was said, the banjo bolt is most likely the oil feed.
The two bolt flange is the oil drain.
The two ports 90 deg. from the oil ports will be coolant ports. One pressure , one return, doesnt matter which way.

As for the wastegate. Best off to put shop air to it with a regulator and add pressure until the arm moves.
That will tell you what its set for. On the diaphragm actuators, if I remember correct, we just disconnected the shaft and loosed the lock nut and backed the arm off as much as we could to hold it closed for longer and it would make more boost.

 

Ok everything makes sense except the banjo bolt.
is the banjo bolt a restrictor? And what type of feed line do i use for it then.

 

Thats just a banjo bolt, shouldn't restrict flow, chances are thats not a ball bearing turbo so you don't need to restrict the oil flow, I'd use AN type fittings in the water and oil supply ports and I found the an oil return kit here https://www.maxpeedingrods.com/prod...-oil-feed-return-drain-line-inlet-outlet.html

 

So you wouldn’t even use the banjo bolt? Just a -an line

 

Yes use the banjo bolt. I think sam was just stating not to add a restrictor.
Look up AUTOMOTIVE BANJO BOLT FITTINGS if you dont know what they are. That will give you the understanding of how they work.