100% Emissions or No Emissions w/ Air pump to Cat

FerociousP · 02-05-2010, 10:10 AM

I have to pass emissions in my county. There is a sniff test and a check for a cat (under car mirror check). I have started to finish the emissions on my t2 motor and learning the details of how the emissions system works I am less and less inclined to finish it to 100%. It seems the airpump, while providing some functions for anti-afterburn and driveability issues, takes air from the airpump and sends a small portion to the exhaust ports and sends the rest to the cat to aid in the reaction with exhaust gases. There is no EGR on S5 engines, so the only emissions functions are basically this air distribution system.

I have an RB downpipe to a custom cat center section with a RB catback. Will I have lower emissions by putting all the equipment back on and running the system "as Mazda intended"? Or, should I take all the equipment off and run the outlet hose of the airpump to the cat come emissions time? Will I see different results? Has anyone documented this?

JDriftM · 02-05-2010, 06:17 PM

From what I remember TitaniumTT say, he passed emissions in CT by only putting a cat on and tuning it out. But, if you're running stock ECU, i'd imagine that pumping fresh air straight to the cat would be beneficial. I don't know though, I'm only theorizing here.

Anyone else got any insight? I'm curious, seeing as I'm looking to move into an area with emissions testing.

-J

RotaryDiagnostics · 02-06-2010, 09:57 AM

Look into the titling laws for the state you will be moving to. You may be able to register the car as a Classic which, in PA at least, does not require emission testing.

djmtsu · 02-06-2010, 09:59 AM

Where we are in TN, he has to get it sniffed, with a cat check. Whatever you do under the hood to make it pass is fair game.

Here in TN a classic car must be 25 yrs old, and can ONLY be driven on weekend, or to and from a certified Club gathering.

So that doesn't work either.

Rx-7fetish · 02-06-2010, 03:32 PM

Quote:

Originally Posted by djmtsu

Where we are in TN, he has to get it sniffed, with a cat check. Whatever you do under the hood to make it pass is fair game.

Here in TN a classic car must be 25 yrs old, and can ONLY be driven on weekend, or to and from a certified Club gathering.

So that doesn't work either.

Classic or antique? i think your getting it backwards, i thought classic was 1000 miles a year or to work only and antique was club/weekend only?Could be wrong, im also in VA

Ender · 02-07-2010, 02:34 PM

All I know if VA is one of the strictest states on cars and driving.

12arotary · 02-08-2010, 02:37 AM

my first rx7 back when I was 16 was a base NA 86, I had one year of emissions to deal with in Ohio, simply with a cat I passed the exhaust check-

Quote:

Originally Posted by Ender

All I know if VA is one of the strictest states on cars and driving.

my vote is on calli

Ender · 02-09-2010, 09:29 PM

Quote:

Originally Posted by 12arotary

my vote is on calli

^^^one of the strictest, not the strictest.

FerociousP · 02-07-2010, 08:29 PM

It doesn't really matter about classic or antique because this is about the operation of the emissions vs a (at emissions testing) workaround.

Has anyone who has emissions testing had equal results before and after emissions removal with such a setup?

View Poll Results: Shoud I run the full emissions equipment or run a hose from the air pump to the cat?
100% emissions. Vacuum spider hell!	0	0%
No emissions, but run air pump to cat come emissions check time?	3	100.00%
Voters: 3. You may not vote on this poll

02-05-2010, 10:10 AM	#1
FerociousP I-had-a-bad-experience... Join Date: Feb 2008 Location: M'boro iTrader: (2) Posts: 1,046 Rep Power: 18	100% Emissions or No Emissions w/ Air pump to Cat I have to pass emissions in my county. There is a sniff test and a check for a cat (under car mirror check). I have started to finish the emissions on my t2 motor and learning the details of how the emissions system works I am less and less inclined to finish it to 100%. It seems the airpump, while providing some functions for anti-afterburn and driveability issues, takes air from the airpump and sends a small portion to the exhaust ports and sends the rest to the cat to aid in the reaction with exhaust gases. There is no EGR on S5 engines, so the only emissions functions are basically this air distribution system. I have an RB downpipe to a custom cat center section with a RB catback. Will I have lower emissions by putting all the equipment back on and running the system "as Mazda intended"? Or, should I take all the equipment off and run the outlet hose of the airpump to the cat come emissions time? Will I see different results? Has anyone documented this? __________________ '15 Juke Nismo '06 MX-5 GT SOLD '04 S Silver RX-8 GT Track Day Use SOLD '90 Black TII vert w/ Sprint RE stock port/turbo DD dyno (242.6whp@5500rpm @12psi 8psi@redline) and (250ftlbtq@4800rpm @13psi) SOLD '89 GTUs 6p TII SOLD, '87 sport SOLD, '79 SA stock SOLD '91 B2600i 4x4 w/ Rx-8 LSD SOLD

02-05-2010, 06:17 PM	#2
JDriftM Dedicated Rotorhead Join Date: Nov 2008 Location: Cincinnati, OH iTrader: (1) Posts: 92 Rep Power: 17	From what I remember TitaniumTT say, he passed emissions in CT by only putting a cat on and tuning it out. But, if you're running stock ECU, i'd imagine that pumping fresh air straight to the cat would be beneficial. I don't know though, I'm only theorizing here. Anyone else got any insight? I'm curious, seeing as I'm looking to move into an area with emissions testing. -J __________________ DGRR 2013.

02-06-2010, 09:59 AM	#4
djmtsu My minds tellin' me no... Join Date: Feb 2008 Location: Murfreesboro, TN iTrader: (10) Posts: 4,043 Rep Power: 21	Where we are in TN, he has to get it sniffed, with a cat check. Whatever you do under the hood to make it pass is fair game. Here in TN a classic car must be 25 yrs old, and can ONLY be driven on weekend, or to and from a certified Club gathering. So that doesn't work either. __________________ 1976 Mazda Cosmo RX-5 1976 Mazda Cosmo RX-5 2003 Toyota Tundra TRD 2015 Toyota 4Runner SR5

02-07-2010, 08:29 PM	#9
FerociousP I-had-a-bad-experience... Join Date: Feb 2008 Location: M'boro iTrader: (2) Posts: 1,046 Rep Power: 18	It doesn't really matter about classic or antique because this is about the operation of the emissions vs a (at emissions testing) workaround. Has anyone who has emissions testing had equal results before and after emissions removal with such a setup? __________________ '15 Juke Nismo '06 MX-5 GT SOLD '04 S Silver RX-8 GT Track Day Use SOLD '90 Black TII vert w/ Sprint RE stock port/turbo DD dyno (242.6whp@5500rpm @12psi 8psi@redline) and (250ftlbtq@4800rpm @13psi) SOLD '89 GTUs 6p TII SOLD, '87 sport SOLD, '79 SA stock SOLD '91 B2600i 4x4 w/ Rx-8 LSD SOLD

02-06-2010, 09:57 AM	#3
RotaryDiagnostics Compression Tester Man Join Date: Feb 2009 Location: Mont Alto, PA iTrader: (1) Posts: 137 Rep Power: 16	Look into the titling laws for the state you will be moving to. You may be able to register the car as a Classic which, in PA at least, does not require emission testing.

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