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  #31  
Old 04-07-2015, 12:44 PM
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Bad tuning causing massive increase in dynamic compression ratio is more to blame than head studs IMO.

Kudos to Amtrapid for sharing his knowledge.
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  #32  
Old 04-07-2015, 01:11 PM
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Details, details. I can't give specifics of torque settings, lube used etc. That's a bit hard to say unless your there at the time but not too many people get to see this. But I do know factory gaskets were used along with ARP2000 head studs. I can say 100% the ARP's in my STi are definitely stretched. Hence why I will future proof it with stronger studs and a builder that I know and trust. Plus I've seen his work.

On the subject of experience. Who do you build your engines for Amtrapid? Do you do private work? Who on the forum is running around with one of your engines? Be good to know...




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Originally Posted by amtrapid View Post
Knowledge is Learnt through practice knowing of something and knowing how to do it are two different things .

Such as if you're going to say something is stretched have evidence such as before torque and at torque lengths and height . Show me how these have stretched beyond their tolerance .

If you're ones did stretch they either were not torqued to specs or you bought the wrong studs for your application ie people will wind more boost in .
What head gaskets did you use . What order were the heads torqued , did you use factory or ARP Instructions . Did you use ARP assembly lubricant . Was your machine work done correctly. Did you make sure the stud holes were completely clean and free of debris .

How much experience have you had I've only been working with Subarus for 20 odd yrs .

I definitely use forums for information but not Knowledge . I have real life experience for knowledge .

And fucking LOL at getting correct info from a forum when people with the experience , get ignored and people do exactly what the failures have posted .

For a fact I have built at least 15 odd long motors with ARP 2000 head studs with that have seen 18 to 21 psi, on up to TD06 turbos without an issue. That have been driven for years without an issue making over 300 ATW .

If you wanted to future proof your engine yes you could use better studs but the build to be future mod proof would be far from mild .

I don't give a fuck how many PMs I get I'm happy to help and if I don't know I won't dribble bullshit I will send you to someone that does. Because there is a wealth of knowledge out there that people will never share on the Internet they will show you.


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  #33  
Old 04-07-2015, 07:41 PM
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Just LOL
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  #34  
Old 04-07-2015, 09:53 PM
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Enough said...

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  #35  
Old 05-07-2015, 02:27 AM
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I used ARP 2000's head studs & case bolts in my semi-closed deck 207 build

It ran up to 1.8 bar on a VF34
It currently runs 1.5bar on a TD05-20g

Motor has done 45,000km since being built.

Perhaps it's just the 2.5's that need all the help they can get to hang together??
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  #36  
Old 05-07-2015, 07:52 AM
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Default 99 wrx seized engine.

There are many examples of 257's in the U.S. with stock internals and 450 plus hp that have done over 50,000 Kms. If stock studs can hold this hp then stronger ones such as the arp2000 are hardly likely to be the cause. I think they are the result of some other error or failure.
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  #37  
Old 05-07-2015, 10:45 PM
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There was a noted failure with ARP with the 2000 arp.
Most were snapping not stretching
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