LT headers and cats
Thread Starter
Drifting
Joined: Jul 2003
Posts: 1,796
Likes: 1
From: Annandale VA
LT headers and cats
I have an outstanding opportunity to use my new C5 coupe as a test mule for some prototype Jet Hot headers. The headers and install will be free, so long as Jet Hot can use me as a reference and show pics of the install in media of their choice. Sounds almost too good to be true, no?
My only concern is staying emissions legal. Will the OEM catalytic convertors work OK with LT headers, or will I need to use O2 sims?
My only concern is staying emissions legal. Will the OEM catalytic convertors work OK with LT headers, or will I need to use O2 sims?
Drifting
Joined: Apr 2001
Posts: 1,337
Likes: 52
From: Wentzville, MO.
Re: LT headers and cats (HITMAN99)
Will the OEM catalytic convertors work OK with LT headers, or will I need to use O2 sims?
Sounds like a sweet deal... :cheers:
[Modified by 99SilverC5Coupe, 9:24 PM 3/11/2004]
Team Owner
Joined: Jan 2003
Posts: 21,234
Likes: 19
From: Freestate Corvette Club! Elkridge, MD
St. Jude Donor '17
Re: LT headers and cats (HITMAN99)
In Maryland, we no longer use the sniffer/roller test. They plug in to the OBDCII computer for the test now. So no problem there. I would try to keep the CATS (stock or high flow) as they can still do a visual inspection if they suspect tampering - and not to mention your car will smell (especially when cold) without them. Whoever is doing the install should be able to reuse your factory CATS
If you want to get rid of the O2 sims, you will have to edit those out of the cars program as the OBDCII test will see that.
Who is doing the install? F body Central?
[Modified by Ragtop_Rob, 6:50 AM 3/12/2004]
If you want to get rid of the O2 sims, you will have to edit those out of the cars program as the OBDCII test will see that.
Who is doing the install? F body Central?
[Modified by Ragtop_Rob, 6:50 AM 3/12/2004]
Thread Starter
Drifting
Joined: Jul 2003
Posts: 1,796
Likes: 1
From: Annandale VA
Re: LT headers and cats (Ragtop_Rob)
Rob, yes --- Jason will be doing the install at FBC. I had already planned to install a set of CNC ported heads, but keep the stock cam. When I spoke to Jason about the install, he mentioned that he was looking for a test mule for the prototype Jet Hots. I will need to work with him on how to tie in the cats, and possibly do an X-pipe as well. His exhaust guy Tyson is really good, so I'm sure it will end up being a clean install. I plan on documenting the entire install, take a bunch of digital pics, etc., then do some dyno testing.
My previous car, a '99 SS, had MACs & no cats, so I know some of the side effects, such as a stinky exhaust. I had Jason edit out the codes w/ LS1 Edit, & had no probs passing a VA emissions test w/ a tailpipe sniffer.
However, I have heard the the future OBDII tests will be able to detect that the codes have been edited out. O2 sims might not be able to be detected so easily.
My previous car, a '99 SS, had MACs & no cats, so I know some of the side effects, such as a stinky exhaust. I had Jason edit out the codes w/ LS1 Edit, & had no probs passing a VA emissions test w/ a tailpipe sniffer.
However, I have heard the the future OBDII tests will be able to detect that the codes have been edited out. O2 sims might not be able to be detected so easily.
Team Owner
Joined: Jan 2003
Posts: 21,234
Likes: 19
From: Freestate Corvette Club! Elkridge, MD
St. Jude Donor '17
Re: LT headers and cats (HITMAN99)
Jason is great. SUPER knowledgable - I went with High flow CATS and kept the sensors just in case they got clever later. I look forward to your pics!
Pro
Joined: Apr 2002
Posts: 726
Likes: 2
From: Denver CO
Re: LT headers and cats (HITMAN99)
Wow!! C :cool: :cool: L deal!!
Got any specs on the headers, i.e. diameter of primaries and collector, length of primaries, how close to equal length the tubes are? I'm close to buying set of headers, but if something closer to what I'm looking for is soon to be on the market, I'd rather wait.
:cheers:
Got any specs on the headers, i.e. diameter of primaries and collector, length of primaries, how close to equal length the tubes are? I'm close to buying set of headers, but if something closer to what I'm looking for is soon to be on the market, I'd rather wait.
:cheers:
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Thread Starter
Drifting
Joined: Jul 2003
Posts: 1,796
Likes: 1
From: Annandale VA
Re: LT headers and cats (TopCat)
I don't have any details yet. My latest info is that the proto's have been fabbed, and are now being coated. Then they will be shipped to FBC, & can then be installed. I'm thinking it will be 2-3 weeks before the install date.
Team Owner
Joined: Jan 2003
Posts: 21,234
Likes: 19
From: Freestate Corvette Club! Elkridge, MD
St. Jude Donor '17
Re: LT headers and cats (HITMAN99)
Do you have LTs?? How much louder was the exhaust?
Thread Starter
Drifting
Joined: Jul 2003
Posts: 1,796
Likes: 1
From: Annandale VA
Re: LT headers and cats (Ragtop_Rob)
I got a reply on another forum, said they sounded louder inside the car due to the thinner wall tubing, but not too much louder outside. I might have to use some header wrap.