Anyone pass emissions without cats???
Anyone pass emissions without cats??? I have heard of people passing emissions without cats and with the stock cam....Is it possible or should i just get some cats welded in??
Joined: Nov 2001
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From: Schiller Park, ILL Member: #317
Re: Anyone pass emissions without cats??? You might be able to pass at higher rpms without cats on a stock motor, but at idle I doubt the exhaust will be clean enough.
TECH Enthusiast
Joined: Nov 2001
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From: Newport Coast, Ca
Re: Anyone pass emissions without cats??? Well im in Cali..and if you don't have cats..the smog ***** would basically laugh at you <img src="graemlins/gr_jest.gif" border="0" alt="[jester]" />
In all seriousness though..i would find it hard for anyone in ANY state to pass emissions without cats. The reason why Catalytic Converters are there is to help clean up the emissions on your car. Without them your spittin out a lot of crap outa the tailpipes <img src="gr_images/icons/wink.gif" border="0"> which in turn would cause you to fail.
but i dunno..i could be wrong
In all seriousness though..i would find it hard for anyone in ANY state to pass emissions without cats. The reason why Catalytic Converters are there is to help clean up the emissions on your car. Without them your spittin out a lot of crap outa the tailpipes <img src="gr_images/icons/wink.gif" border="0"> which in turn would cause you to fail.
but i dunno..i could be wrong
Re: Anyone pass emissions without cats??? [quote]Originally posted by LS1powerN20:
<strong>No way would a Ls1 pass emissions with no cats.</strong><hr></blockquote>
That's what I thought. I might have some RT cats welded in my ORP. Damnit!!!!
<img src="graemlins/gr_cry.gif" border="0" alt="[whiner]" />
<strong>No way would a Ls1 pass emissions with no cats.</strong><hr></blockquote>
That's what I thought. I might have some RT cats welded in my ORP. Damnit!!!!
<img src="graemlins/gr_cry.gif" border="0" alt="[whiner]" />
Re: Anyone pass emissions without cats??? I wouldn't say no way.
A well tuned 60's muscle car can pass the sniffer test without a cat if it's leaned out at idle.
A perfect tuned LS1, with a stock stat that's warmed up, stock fan settings, clean oil that's been leaned out with a MAFT might stand a fair chance of passing.
Of course technically the car fails if the cats are removed regardless of the sniffer test if they catch that.
A well tuned 60's muscle car can pass the sniffer test without a cat if it's leaned out at idle.
A perfect tuned LS1, with a stock stat that's warmed up, stock fan settings, clean oil that's been leaned out with a MAFT might stand a fair chance of passing.
Of course technically the car fails if the cats are removed regardless of the sniffer test if they catch that.
Re: Anyone pass emissions without cats??? Buy some cheap cats and have them flanged so you can swap them with offroad straight pipes when it comes time for testing. You can get some pretty cheap Catco cats from Summit along with the flanges.
Re: Anyone pass emissions without cats??? Don't speak too soon! I have a '77 Z28 that has 240K miles on it, never had the valve covers off, headers w/true duals & no CAT and it passes emissions just fine and has for the past decade! Granted the emissions levels are slightly less stringent for 1977, however my '87 K-5 5.7L TBI Blazer is bone stock, 214K miles, no CAT and passes the same tailpipe emissions requirements that an LS1 needs to pass here in WA State, see the results below:
I'd bet money on the fact that properly tuned that an LS1 will breeze through a tailpipe test and I plan to prove it after I build my headers and true duals!
[ December 18, 2001: Message edited by: John B ]</p>
I'd bet money on the fact that properly tuned that an LS1 will breeze through a tailpipe test and I plan to prove it after I build my headers and true duals!
[ December 18, 2001: Message edited by: John B ]</p>
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TECH Regular
Joined: Nov 2001
Posts: 415
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From: San Diego, Ca / Tucson,AZ
Re: Anyone pass emissions without cats??? [quote]Originally posted by 99 Black Bird T/A:
<strong>
A well tuned 60's muscle car can pass the sniffer test without a cat if it's leaned out at idle.
</strong><hr></blockquote>
Since when do older cars need to pass emissions? <img src="images/icons/confused.gif" border="0">
<img src="graemlins/formula.gif" border="0" alt="[Pontiac]" />
[ December 19, 2001: Message edited by: Trans Am WS6 RGS ]</p>
<strong>
A well tuned 60's muscle car can pass the sniffer test without a cat if it's leaned out at idle.
</strong><hr></blockquote>
Since when do older cars need to pass emissions? <img src="images/icons/confused.gif" border="0">
<img src="graemlins/formula.gif" border="0" alt="[Pontiac]" />
[ December 19, 2001: Message edited by: Trans Am WS6 RGS ]</p>
