2 catalytic converter + sr20 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

240Stilo · 03-13-2003, 12:23 PM

After noticing that all too many cars are starting to come turbocharged factory direct, I was trying to figure out why the SR wouldn't pass emissions. What I found was that the WRX has 2 catalytic converters so , Hypothetically speaking, if you put to catalytic converters on a SR do you think it would pass emissions? One more thing, Does restricting the exhaust air flow cause the turbo to become damaged over time? Or, does it just make it so you loose performance?

AKADriver · 03-13-2003, 12:55 PM

The reason is and always has been marketing... dat's it and dat's all. The SR doesn't pass emissions because Nissan never bothered to do the paperwork to sell it here. That's all that matters - labeling, testing, documentation.

In the days the SR was in production we had 4G63s and 3S-GTEs coming in US-market cars with a single cat and only basic emissions controls. If Nissan wanted to sell it, they could... they even had a special even-lower-emissions, lower-octane-fuel export version of the SR20DET cooked up, that they of course used in Europe in the S14.

The WRX and Lancer Evolution need more extensive measures because the standards worldwide have gotten much stricter since then. The WRX's second cat specifically is mounted BEFORE the turbo, for fast lightoff and reduced cold start emissions.

Backpressure doesn't damage the turbo. Just restricts it.

240Stilo · 03-13-2003, 01:50 PM

Jeez, I knew this would probably happen. I didn't ask why Nissan didn't sell the SR in the states I was just asking if HYPOTHETICALLY speaking, would 2 cats on the SR pass the sniffer. And yes I know it won't pass visual.

NiteKids · 03-13-2003, 02:13 PM

:Juan:

adey · 03-13-2003, 02:14 PM

An SR in good shape will pass sniffers easily. I don't know where you got the notion that they wouldn't...

Kid Zelda · 03-13-2003, 02:16 PM

Quote:

Originally posted by 240Stilo
Jeez, I knew this would probably happen. I didn't ask why Nissan didn't sell the SR in the states I was just asking if HYPOTHETICALLY speaking, would 2 cats on the SR pass the sniffer. And yes I know it won't pass visual.

Yes it will pass smog, my old 89 with SR passed smog, but I can't find the paper results. .. fudge !
Had one cat.

240Stilo · 03-13-2003, 02:17 PM

So the only thing they don't pass is the visual. Sorry all previous talk about the SR and CA emissions got me a little confused.

240Stilo · 03-13-2003, 02:20 PM

Quote:

Originally posted by NiteKids
:Juan:

Winner of the Best Post Award!

fogleroller · 03-13-2003, 02:20 PM

the 3SGTE MR2's (91-95) came with 2 catalitic converters. One huge one right off the turbo and a dinky one before the muffler. The weird thing is that it will pass emissions with out the secondary muffler. There are people that have passed their MR2's without any cats at all (with the help of Super AFC or EMS)

DuffMan · 03-13-2003, 03:55 PM

You can pass a sniffer test with NO CATS let alone 1. 2 would just be stupid.

The reason some new cars have more is because new cars have to go through a cold startup emissions test in order to get EPA certification. Because the turbo is in the way turbo cars take longer to heat up the cats, and manufacturers have to use some trickery to improve the cold startup emissions.

But when you go to the sniffer test if your 1 cat is already warmed up it would be fine.

240Stilo · 03-13-2003, 09:51 PM

Cats stupid? Come on....don't you even want to help the environment at least a little?

DuffMan · 03-13-2003, 10:22 PM

How bout not having a car and just getting arround by riding a bike or something? No?

Probably because the effect on the evironment is inconsiquential as long as you have a good running car with one cat.

240Stilo · 03-14-2003, 12:31 AM

Touche....You got an excellent point.

03-13-2003, 12:23 PM	#1
240Stilo Junkie Join Date: May 2002 Location: Socal Age: 41 Posts: 1,160 Trader Rating: (0) Feedback Score: 0 reviews	2 catalytic converter + sr20 After noticing that all too many cars are starting to come turbocharged factory direct, I was trying to figure out why the SR wouldn't pass emissions. What I found was that the WRX has 2 catalytic converters so , Hypothetically speaking, if you put to catalytic converters on a SR do you think it would pass emissions? One more thing, Does restricting the exhaust air flow cause the turbo to become damaged over time? Or, does it just make it so you loose performance? __________________ -Juan

03-13-2003, 01:50 PM	#3
240Stilo Junkie Join Date: May 2002 Location: Socal Age: 41 Posts: 1,160 Trader Rating: (0) Feedback Score: 0 reviews	Jeez, I knew this would probably happen. I didn't ask why Nissan didn't sell the SR in the states I was just asking if HYPOTHETICALLY speaking, would 2 cats on the SR pass the sniffer. And yes I know it won't pass visual. __________________ -Juan

03-13-2003, 02:14 PM	#5
adey Post Whore! Join Date: Mar 2002 Location: Hong Kong Posts: 3,072 Trader Rating: (0) Feedback Score: 0 reviews	An SR in good shape will pass sniffers easily. I don't know where you got the notion that they wouldn't... __________________ Instagram: @SX180HKG

03-13-2003, 02:17 PM	#7
240Stilo Junkie Join Date: May 2002 Location: Socal Age: 41 Posts: 1,160 Trader Rating: (0) Feedback Score: 0 reviews	So the only thing they don't pass is the visual. Sorry all previous talk about the SR and CA emissions got me a little confused. __________________ -Juan

03-13-2003, 02:20 PM	#9
fogleroller Zilvia Junkie Join Date: Dec 2001 Location: MIRAMAR / San Diego Posts: 464 Trader Rating: (3) Feedback Score: 3 reviews	the 3SGTE MR2's (91-95) came with 2 catalitic converters. One huge one right off the turbo and a dinky one before the muffler. The weird thing is that it will pass emissions with out the secondary muffler. There are people that have passed their MR2's without any cats at all (with the help of Super AFC or EMS) Last edited by fogleroller; 03-13-2003 at 02:29 PM..

03-13-2003, 12:55 PM	#2
AKADriver Post Whore! Join Date: May 2002 Location: Springfield, VA Age: 43 Posts: 3,517 Trader Rating: (1) Feedback Score: 1 reviews	The reason is and always has been marketing... dat's it and dat's all. The SR doesn't pass emissions because Nissan never bothered to do the paperwork to sell it here. That's all that matters - labeling, testing, documentation. In the days the SR was in production we had 4G63s and 3S-GTEs coming in US-market cars with a single cat and only basic emissions controls. If Nissan wanted to sell it, they could... they even had a special even-lower-emissions, lower-octane-fuel export version of the SR20DET cooked up, that they of course used in Europe in the S14. The WRX and Lancer Evolution need more extensive measures because the standards worldwide have gotten much stricter since then. The WRX's second cat specifically is mounted BEFORE the turbo, for fast lightoff and reduced cold start emissions. Backpressure doesn't damage the turbo. Just restricts it.

03-13-2003, 02:13 PM	#4
NiteKids BANNED Join Date: Feb 2002 Location: Socal Posts: 1,223 Trader Rating: (0) Feedback Score: 0 reviews	:Juan:

03-13-2003, 03:55 PM	#10
DuffMan Post Whore! Join Date: Oct 2001 Location: in a cardboard box Posts: 2,517 Trader Rating: (0) Feedback Score: 0 reviews	You can pass a sniffer test with NO CATS let alone 1. 2 would just be stupid. The reason some new cars have more is because new cars have to go through a cold startup emissions test in order to get EPA certification. Because the turbo is in the way turbo cars take longer to heat up the cats, and manufacturers have to use some trickery to improve the cold startup emissions. But when you go to the sniffer test if your 1 cat is already warmed up it would be fine.

03-13-2003, 09:51 PM	#11
240Stilo Junkie Join Date: May 2002 Location: Socal Age: 41 Posts: 1,160 Trader Rating: (0) Feedback Score: 0 reviews	Cats stupid? Come on....don't you even want to help the environment at least a little? __________________ -Juan

03-13-2003, 10:22 PM	#12
DuffMan Post Whore! Join Date: Oct 2001 Location: in a cardboard box Posts: 2,517 Trader Rating: (0) Feedback Score: 0 reviews	How bout not having a car and just getting arround by riding a bike or something? No? Probably because the effect on the evironment is inconsiquential as long as you have a good running car with one cat.

03-14-2003, 12:31 AM	#13
240Stilo Junkie Join Date: May 2002 Location: Socal Age: 41 Posts: 1,160 Trader Rating: (0) Feedback Score: 0 reviews	Touche....You got an excellent point. __________________ -Juan

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