SCT and Smog? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 28 (permalink) Old 05-13-2010, 02:12 AM Thread Starter
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SCT and Smog?

Can anyone help? I'm in California and had to smog my 2003 6.0 F250 diesel. Nightmare already! I have a 4" turbo back exhaust and custom tunes from Innovative. An economy tune, tow, and street tune for the past 2 years. Trucks been running great. I put truck back to stock,took it to smog place, the guy was friendly enough to pass the truck with no cat, but it would'nt pass because his machine could'nt COMMUNICATE WITH VEHICLE!! 8 times! So I took it to dealer to get checked, no problems, there laptop communicates with the truck PCM just fine. So I go back,same thing at smog place. I then take it to 2 other smog places and they too can't communicate with the truck PCM. Dealer even swapped PCM. So now I have to go to a Referee to get smog test and cleared, so I put the cat back on, a muffler guy did it.
My question is if I leave the cat on the 4" exhaust, will it affect how the truck runs when I run the tunes? Backpressure? Exhaust Temps? Dealer flashed truck with latest update, he said it had to do with the injectors. I read the strategy with the SCT tuner, and it did't change, same code, so no need to get new tunes I suppose. Just wondering if truck will run ok if I leave the cat on with tunes I got for a no cat exhaust? I have a piece I cant bolt in place of the cat also.
Thanks to all who can help!
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post #2 of 28 (permalink) Old 05-13-2010, 10:11 PM
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I don't think it will affect it too much. I'm running an SCT with a 4'' with cat and muffler.

John - 2004 Harley F250 Black/Competition Orange All the factory goodies, '05 Black Harley Headlights, Silverline 4'' Duals W/5'' Chrome Tips, Edge Platinum, Sirius Satellite,Pioneer AVIC D3

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post #3 of 28 (permalink) Old 05-13-2010, 10:22 PM Thread Starter
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Fantom, what kind of tunes you running??
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post #4 of 28 (permalink) Old 05-14-2010, 06:16 AM
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I'm running Street and Tow from GOS racing. Currently I'm running the looney tune from vivian

John - 2004 Harley F250 Black/Competition Orange All the factory goodies, '05 Black Harley Headlights, Silverline 4'' Duals W/5'' Chrome Tips, Edge Platinum, Sirius Satellite,Pioneer AVIC D3

2001 Ford F550 XLT, Torreador Red,
7.3 Diesel, auto trans. chrome 19.5's
Rugby Dump Body, painted to match.

2004 F250 Reg Cab Long Box XL. Upgraded chrome grille and clear headlights from '04 Harley. Lariat Alloys and Factory CD/Cassette (Totaled 10/2/09)

1995 F350 Crew Cab Dually XLT, 460 Gas hog.
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post #5 of 28 (permalink) Old 05-15-2010, 12:21 AM Thread Starter
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Whats your specs on the tunes? How much horse pwr, torque increase, all that stuff??
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post #6 of 28 (permalink) Old 05-15-2010, 01:41 AM
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Tell the IDIOT smog tech to read the testing documentation. '03+ Ford Diesels use CAN protocol, and California currently can not communicate with it. He's not doing the test right.

The Current Truck (Oct-2013 to Present):
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7.3L Powerstroke, 4R100, 4x4, 3.73, 37x13.50-18s, '05 Axle Swap, 6" Fabtech lift, GTP38 "D66" turbo upgrade, SCT 4-position chip with custom tuning by me, Straight Piped 4" down pipe through 5" dual stacks, N-Fab full length triple steps, Pro-Tech cab guard and tool box, louvered 5th wheel gate, Hella 500 Fog and Driving lamps, much more to come...
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post #7 of 28 (permalink) Old 05-17-2010, 02:16 AM Thread Starter
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Thanks Idaho! I took it to another tech a friend referred, and he said the same thing you did! It uses a can protacol whatever that is. The first 3 techs did'nt have anything written on their papers telling them that it was a can!! Anyhow, I put the cat back on, but not sure if I should leave it with my tunes, which are mild by the way. Can you tell me what the heck the muffler does on a straight pipe, I know stupid question. Does it just muffle the exhaust sound? Not for emissions right?
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post #8 of 28 (permalink) Old 05-18-2010, 05:10 PM
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For the purpose of passing the visual inspection you'll probably need the muffler. It doesn't have to really do much, just needs to be there. They aren't testing sound emissions and they probably won't ever. Actually, if they ever do, 6.0's are going to have a hard time passing total vehicle noise. Anyway, if you have a muffler, you probably ought to run it for the test if it's an easy install.

Something else to keep in mind, they are only testing opacity with a snap test, not chemical makeup of the exhaust, so as long as it doesn't huff a cloud when you snap the throttle, it doesn't matter if the cat is working or not, you'll still pass. I have a tow tune that would pass with flying colors, and it makes about 120ft/lbs more torque than stock. Just realize, No Smoke = No Problem!

The Current Truck (Oct-2013 to Present):
1999 (Early) F-350 Lariat, CCLB, SRW, Black/Tan

7.3L Powerstroke, 4R100, 4x4, 3.73, 37x13.50-18s, '05 Axle Swap, 6" Fabtech lift, GTP38 "D66" turbo upgrade, SCT 4-position chip with custom tuning by me, Straight Piped 4" down pipe through 5" dual stacks, N-Fab full length triple steps, Pro-Tech cab guard and tool box, louvered 5th wheel gate, Hella 500 Fog and Driving lamps, much more to come...
The one I'll miss, (Mar-2009 to Jan-2014):
2000 Excursion XLT 4x4

6.8L V-10, 4R100, 4.30, 285/75-18, 271whp / 388wtq
The one I won't, (Jul-2005 to Sep-2012):
2005 F-350 XLT, CCLB, SRW, 4x4 FX4

6.0L PSD, ZF-6S650, 3.73, 35x12.5-18, 4.5" Lift
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post #9 of 28 (permalink) Old 05-18-2010, 08:05 PM
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Quote:
Originally Posted by IdahoF350 View Post
For the purpose of passing the visual inspection you'll probably need the muffler. It doesn't have to really do much, just needs to be there. They aren't testing sound emissions and they probably won't ever. Actually, if they ever do, 6.0's are going to have a hard time passing total vehicle noise. Anyway, if you have a muffler, you probably ought to run it for the test if it's an easy install.

Something else to keep in mind, they are only testing opacity with a snap test, not chemical makeup of the exhaust, so as long as it doesn't huff a cloud when you snap the throttle, it doesn't matter if the cat is working or not, you'll still pass. I have a tow tune that would pass with flying colors, and it makes about 120ft/lbs more torque than stock. Just realize, No Smoke = No Problem!
Per requirements the vehichle must retain all emissions equipment that also means the CAT, the CAT inspection should be nothing more than a visual.

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post #10 of 28 (permalink) Old 05-18-2010, 09:41 PM Thread Starter
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AFTER the test though, should I leave the cat on , or bolt the straight piece back on that I made? Would it make much difference in the performance and temps on the truck??
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