Am I Screwed?

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Jun 30, 2005 | 10:48 AM

LT4Thunder

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Joined: Jun 2003

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From: Rochester NY

Am I Screwed?

I have a 1996 LT4 with LT headers, no cats, all stainless steel with flowmasters. I need to revise the exhaust to comply with NY state's new OBDII inspection process, which means putting cats back on.

I have talked to 2 exhaust shops that are recommending scrapping my entire system and returning it to stock.

Has anyone modified a setup like mine that has passed OBDII inspection? All four O2 sensors are there. Do the sensors need to be located a specific distance back from the engine to work properly?

Suggestions?

I could install O2 sims but it wouldn't pass a visual.

I need help!

Jun 30, 2005 | 10:56 AM

FoolCrzy

Melting Slicks

Joined: Apr 2001

Posts: 2,474

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From: Drive it Like You Hate it Cincinnati OH

I'm going to be installing Headers and High Flow cats on my LT4 next month. I plan on relocating the rear 02's and seeing what happens.

Jun 30, 2005 | 11:03 AM

VAHROOM

Burning Brakes

Joined: Apr 2000

Posts: 980

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From: Chandler AZ

O2 sims will stop it from coding but....

O2 sims will stop it from coding but, I understand that NY and CA are tough with their inspections. I have a similar exhaust setup and O2 sims on my LT4. In AZ all they do is hook up to Mr. PCM and look at the OBDII here. They do have an inspection mirror that is supposed to look under the car, luckily mine is too low for it to work. Just make the cats easy to remove and replace. Or you can just bend sheet metal to look like cats that clamps on to show the inspector.

Jun 30, 2005 | 12:12 PM

sothpaw2

Safety Car

Joined: Sep 2002

Posts: 4,030

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From: Maryland

Quote:

Originally Posted by LT4Thunder

I have the Exotic Muscle long tubes but not installed yet. My understanding is that you can install the O2's and cats and it will perform as stock (all O2's working, cats effective).

If the visual just looks for cats, and the inspection is just a dyno, you will be ok.

If, however, they inspect for the cats at the stock location--you're screwed. I very much doubt this though--they'd have to know the location on a lot of makes& models.

Jun 30, 2005 | 12:21 PM

VR'92

Team Owner

Joined: Sep 2003

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From: I'm the walkin dude I can see all of the world...

St. Jude Donor '03

Why not just buy High Flow Cats?

Is there a visual inspection like California?

Jun 30, 2005 | 12:22 PM

Perfusion

Race Director

Joined: Aug 2003

Posts: 11,043

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From: San Jose Pat Tillman - American Hero

Quote:

Originally Posted by LT4Thunder

Install some good high-flow cats, and you'll pass with flying colors. The exhaust shops you spoke with see a Corvette, and they smell money. They want you to scrap your system so that *they* can rebuild it for you. Besides, they're required by law (most likely) to discourage you from altering emmissions equipment on your vehicle. If you want reliable information about getting your car to pass emmissions, you have two places to go:

1) the people who drive modded cars and have passed (i.e., CorvetteForum or your local Vette club), or

2) the shops that build the modded cars.

Anything's possible - you just have to find the right shop. FWIW, there are plenty of people with C3s, C4s, and C5s (and soon, C6s as well) running in CA with LTs and *no* cats, let alone LTs and cats. If we can pass, you can.

Jun 30, 2005 | 01:31 PM

LT4Thunder

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Joined: Jun 2003

Posts: 9

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From: Rochester NY

Thanks, all.

My concern with a visual inspection was if I used O2 sims. If I install bullet cats I can get by the visual.

Perfusion,
My AIR pump was disconnected when the cats were removed. Where do the air lines connect on your setup? To the Random Tech cats?

Time to put the car on jack stands and get started.

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