exhaust studs keep braking

[hillfolk'r]

i wanna say the tq is 18 ft  pounds...or it could be 11...crap i cant remember...someone will post though id bet...
actually you do not wanna use grade 8 fastners...they are too hard and dont expand enough or the same as the manifold and turbo...grade 5 stuff is ok..thas wat i lurned in tek skool n stuff..yea you would think ya want hardened stuff,but just the opposite,ya need flex for heat expansion

[fatmobile]

Got the fatty exhaust washers?

[jeff115]

Got the fatty exhaust washers?

yes

i wanna say the tq is 18 ft  pounds...or it could be 11...crap i cant remember...someone will post though id bet...
actually you do not wanna use grade 8 fastners...they are too hard and dont expand enough or the same as the manifold and turbo...grade 5 stuff is ok..thas wat i lurned in tek skool n stuff..yea you would think ya want hardened stuff,but just the opposite,ya need flex for heat expansion

never would have thought that.

[Alcaid]

Kinda offtopic, but what T3 are you running?

[theman53]

Yeah from what hillforlk'r says is accurate. The Grade 8 are much stronger, but lack stretch. You will get way more clamping force with a Grade 8, but if the tensile of the fastener is 120,000 psi it will usually break past that. Grade 5 on the other hand is lots less tensile at around 80,000 but it will give some before it breaks. It will stretch and deform, where the grade 8 will just call no joy and give it up.

If you still need the bentley spec I will get it later if you ask.

[jeff115]

Probably wont need the torque specs I stopped at oreily's today and got some 3/8-16 header bolts so hopefully that helps.

Kinda offtopic, but what T3 are you running?

I have run several so far I had a t3to4e from ebay and it sucked. pretty close to the stock t3, but a little bit more laggy. then I had an ebay gt15, witch was left on for the longest because it worked good. drove it for about a month @26 psi still running strong but I wanted to try something else so now I have an ebay gt28rs. hopefully ill have the manifold all sorted out to see how it works this weekend.

the first two ebay turbos I used because I had them...
they didnt leak oil or blow up like I allways here and I pushed the gt15 pretty hard in bad conditions. so I have faith in them. well see how this new one works.
specs are
compressor                 turbine
inducer   54.13mm   inducer   52.00mm
exducer   70.00mm   exducer   45.00mm

[R.O.R-2.0]

please dont thread your head for 3/8-16 bolts!

bolts are worse than studs..

[hillfolk'r]

yea stick with the studs fer sur...just like head studs,they are better than bolts,sothe same applies for the exhaust(or most any application)...even though i graduated from tech school in 97,there isnt a day that goes by im referring  back to what i got learned
still gettin learned every day too!
not like you would have to but repeated removal/install of" bolts" would start to wear out the head.

[TurboJ]

Here's a pic of turbo braces:

http://aki76.kuvat.fi/kuvat/vento+TTSI/09042012027.jpg

Aki's work once again.
Ball bearings work great as they allow small margin of movement - will not cause breaking of brace joints.

[R.O.R-2.0]

yea stick with the studs fer sur...just like head studs,they are better than bolts,sothe same applies for the exhaust(or most any application)...even though i graduated from tech school in 97,there isnt a day that goes by im referring  back to what i got learned
still gettin learned every day too!
not like you would have to but repeated removal/install of" bolts" would start to wear out the head.

yea, the head is REALLY SOFT aluminum..

the bolts are REALLY HARD steel..

the steel wins every time..

nothing like taking a header bolt out, and finding a coil of aluminum wrapped around the threads, that USED TO BE the threads from the head..