03-29-2012, 08:00 PM | #1 |
Drives: 2015 c7 Join Date: Nov 2009
Location: MI
Posts: 7,462
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efficiency of high flow cats with a cam?
i have a question about high flow cats, with our cammed camaros.
when i went to pick up my car from the shop after a cam job, i honestly cannot remember exactly what he said. but i know it was something about cams not being emission friendly or something of that nature. so my question, even with high flow cats plus correct tune our cars still are not emission friendly and would fail a smog test ? |
03-29-2012, 08:08 PM | #2 |
Drives: 2010 camaro ss Join Date: Feb 2012
Location: houston,texas
Posts: 382
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Thats an interesting question. Fortunately my area don't check emmissions
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03-29-2012, 08:13 PM | #3 |
Drives: 2015 c7 Join Date: Nov 2009
Location: MI
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03-29-2012, 08:39 PM | #4 | |
Drives: Black 2011 2SS/RS M6 Vert Join Date: Apr 2011
Location: Houston, TX
Posts: 252
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Quote:
I can say that I have modded plenty of cars in Texas, and always passed the smog test as long as I did not have a CEL.
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2011 Black 2SSRS M6 Vert, Nitto Invos on HRE P40s (20X11 rear, 20X9 front), lowered 1" on Pfadt coilovers, Eibach sway bars, American Racing frame brace, Brembo big brakes (16" front, 15" rear), ZR1 dual disc clutch, MGW Shifter, 3.91 gears with Eaton Truetrac and LPW cover, DSS 1000HP axles, DSS 3.5" aluminum drive shaft, Magnacharger with RDS Stage II and 2.8" pulley, Lingenfelter GT9 Cam, GM CNC ported heads, American Racing LT headers with high flow cats, custom 3" exhaust with Magnaflow mufflers and resonator (630 RWHP).
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03-29-2012, 09:12 PM | #5 |
Drives: 2012 2SS M6 Join Date: Dec 2011
Location: Phoenix, AZ
Posts: 768
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2 or 3 people at the shop told me mine will pass with the cam and high flows and the guy who actually did the work told me if it doesn't he'll fix. On the other hand, I'm going to have to hope the people doing the test have a head cold that day because it doesn't smell like it will pass. We get 4 or 5 years before we have to go, and who knows what the rules will be then. We're not supposed to talk politics here, so I'll just say if the wrong people get elected the whole country could have rules like California in 4 more years.
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2012 2SS Convertible
Magnuson, Headers, Cam, JRE Tune. 563 HP. |
03-29-2012, 11:40 PM | #6 | |
Drives: 2015 c7 Join Date: Nov 2009
Location: MI
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Quote:
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03-30-2012, 11:07 AM | #7 |
Drives: Exige, Miata, Ghia Join Date: Jun 2011
Location: CA, Bay Area
Posts: 2,309
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In CA, we have the visual, OBD hook up, and sniffer test done when we smog our cars. Yes they check everything. I heard starting in 2013, they are going to stop with the sniffer test and only do the visual and OBD hook up. So I would think that if your tune is good and you're not throwing any codes, then you just have to worry about the visual. Every single shop that I have brought my previous car to are complete dolts. They couldn't tell you the difference between an intake manifold and a door knob. So as long as your readiness codes come back perfect, then you're good. By the way, it has yet to be determined if tunes will some how make you not pass. I heard that they have some sort of stock parameters that they get from the state/manufacturers and if it doesn't match your ECM, then you fail.
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03-30-2012, 12:15 PM | #8 |
Drives: 2015 c7 Join Date: Nov 2009
Location: MI
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ya thats what i was talking about the sniffer test. i thought the nature of cams with the valves being open longer its bond to let more gas escape. i watched a movie on cats, they said once cats were warmed up they stop 99% of Co2 gas. i was wonder if high flow cats with a cam would also be 99%.
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03-30-2012, 12:22 PM | #9 |
Drives: 2010 Camaro SS, 2018 Colorado Join Date: Nov 2009
Location: NC
Posts: 2,207
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I thought you were cammed?
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03-30-2012, 03:37 PM | #10 |
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He is and is just wondering how effective his HF cats are at burning off the exhaust vapors. I'm curious too since I have a cam and HF cats as well. I know one thing the cats are doing something because until they heat up I get a lot of tail pipe vapor/odor on a cold start. Once runnning for a few minutes the odor goes away. Odor aside - not sure if they are burning off 99% of the CO2 though.
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03-30-2012, 03:52 PM | #11 | |
Drives: 2012 2SS M6 Join Date: Dec 2011
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Quote:
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2012 2SS Convertible
Magnuson, Headers, Cam, JRE Tune. 563 HP. Last edited by Lee123; 03-30-2012 at 05:33 PM. |
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