[V8] flashing cat light

[Dave Saad]

The end result of punching the guts out of the cat is likely to be  
extreme exhaust turbulence - something that is far worse than having a  
working cat if performance is your reason for doing this.  You need to  
remember that all motors - and this one in particular - rely on a  
certain amount of back pressure to make things run cleanly and  
powerfully.  The 3.6L does not have a EGR or air pump for this  
reason.  If you mess up the exhaust flow too much the stock ECU won't  
respond the way it should.  Contrary to popular belief, EGR is usually  
a performance enhancer.  It does the same thing as a water injection  
system does - it cools the combustion mixture which helps the motor  
run cleaner and also helps prevent pre-ignition.  Punching out the  
cats would most likely result in retarded ignition timing because you  
are likely to get pre-ignition.  Something that is really really bad  
for any motor - and especially bad for a motor that can not be rebuilt.

Dave


On Feb 18, 2009, at 7:56 PM, Seamus O'Carey wrote:

> I have pretty much the same issue.
>
> Your options are:
> A. Remove them, but unless you have the equipment to remove them  
> yourself,
> you'd have to find a shop willing to do the work.  It's a HUGE fine  
> if they
> get caught, though, so most won't want to.
> B. Rather than remove them you can just gut them (jam a rod through  
> them
> over and over until nothing is left inside), but again you'll have  
> to find a
> way to remove and replace them.  If our cats are bolt-ons it won't  
> be a
> problem, but if they're welded in place you'll have the same trouble  
> as
> option A.
>
> I was thinking about just gutting my cats if it turns out they're just
> bolted in place, but it seems like cats are usually welded at least  
> at one
> end.
>
> Seamus
>
> On Wed, Feb 18, 2009 at 5:42 PM, Curtis Helton <fatboy03 at gmail.com>  
> wrote:
>
>> Have had that every since I bought the car. It runs great. No  
>> hesitation,
>> stuttering, ect.
>> Only thing it does every once in a while is it will not start and  
>> stay
>> running after it's warmed up. I have to give it some gas to keep it
>> running.
>> After I take off in it, it's fine.I did VAG it and their were NO  
>> codes.
>>
>> Several questions here.
>>
>> 1. Can I get rid of the cats all together w/o to much trouble?  
>> Thinking I
>> would like a little louder exhaust than stock. Also no emission  
>> testing.
>> So,
>> no worries there.
>>
>> 2. As far as how it doesn't want to stay running while trying to  
>> start it
>> after it's warmed up.Would that have anyhing to do with the cats?
>>
>>
>> TIA,
>>
>> Curtis
>> _______________________________________________
>> Audifans V8 mailing list
>> Send posts to: mailto:V8 at audifans.com
>> Manage your list connection: http://www.audifans.com/mailman/listinfo/v8
>>
>> You can help keep the audifans site running by shopping at
>> http://audifans.com/shop/
>>
>>
> _______________________________________________
> Audifans V8 mailing list
> Send posts to: mailto:V8 at audifans.com
> Manage your list connection: http://www.audifans.com/mailman/listinfo/v8
>
> You can help keep the audifans site running by shopping at http://audifans.com/shop/
>