turbo > cat bolts?

[Mark R]

I agree.  Regular stainless hardware in the stores is 304 series and is
roughly equivalent to grade 5 steel as far as strength.  For exhaust
installtion, this is sufficient.  The key is proper installation, gasketing,
and torque.  Personally, I'd use 316 series due to the heat.  The added
mechanical properties is a nice bonus, but I use 316 due to it's higher
resitance to corrosion in the high heat (and resulting condensation)
situation.

ARP would likely have appropriate hardware, but that's overkill, I'm sure.

Mark Rosenkrantz


On 3/20/07, Ameer Antar <antar at comcast.net> wrote:
>
> I've used 316 (A4) grade stainless hardware and they've held up on the
> turbo
> and wastegate just fine. I used regular old 304 stainless (A2) on the cat.
> No
> problems at all. Just make sure you don't use an impact wrench on these
> things.
> Is your cat directly bolted to the turbo? Strange setup, but if it is,
> definitely go with the A4 grade; these are supposed to retain their
> strength in
> high-heat situations. If you need any I just may have some left over.
>
>
> -Ameer
>
>
> -------------------- Original Message --------------------
>
> > Message: 5
> > Date: Mon, 19 Mar 2007 22:36:28 -0700
> > From: thejimrose [thejimrose at gmail.com]
> > Subject: turbo > cat bolts?
> > To: quattro at audifans.com
> > Message-ID:
> >     [298352bd0703192236r52a5da58u51053784b8012d63 at mail.gmail.com]
> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> >
> > anyone have thoughts on what to use for the bolts to attach my turbo to
> my
> > shiny new high flow cat? the stock stuff is grade 8.8 black oxide.
> pretty
> > standard. i'd like to step to stainless but it seems SS bolts are a
> little
> > softer [ive broken a few].
> >
> > i got some SS nuts, bolts + washers from the local ace, but i NEVER want
> to
> > do this job again so if there's a best grade or hardware to use, i'm al
> over
> > it.
> >
> > thanks
> > jim
> >
> >
> > ------------------------------
> >
> _______________________________________________
> quattro mailing list
> quattro at audifans.com
> http://www.audifans.com/mailman/listinfo/quattro
> ---
> Watch this space for ads :)
>