Failed Smog

markbark22 · 03-26-2007, 01:37 PM

I have a whipple supercharger on a 2000 silverado and i failed the test because of the computer not being able to be read. Any recommendations? thanks

ikos10 · 03-26-2007, 02:26 PM

At any aftermarket performance shop, you can purchase a bypass regulator for your o2, and air mixture sensors wich should allow it read right from your computer.... I wouldn't nescesarily recomend this, but it has worked for a few people I know.

junior3382 · 03-26-2007, 02:36 PM

Quote:

Originally Posted by ikos10

At any aftermarket performance shop, you can purchase a bypass regulator for your o2, and air mixture sensors wich should allow it read right from your computer.... I wouldn't nescesarily recomend this, but it has worked for a few people I know.

Yeah that will work, but you need to make sure you get them tuned so that you don't cause the mixture to be too lean. but if you go that route, the guys at the performance shop should be able to help you there too.

markbark22 · 03-26-2007, 02:43 PM

Ok but the only problem im really having is that it has worked before by just re programming it to the trucks original specs, what will the bypass do and doesnt the programmer do that in itself
?

ikos10 · 03-26-2007, 03:07 PM

Quote:

Originally Posted by markbark22

Ok but the only problem im really having is that it has worked before by just re programming it to the trucks original specs, what will the bypass do and doesnt the programmer do that in itself?

Yes and no. By in stalling the bypass, the o2 sensors read the exhaust as fine, and air mixture will help, so when you get the lovely polution test that we now need, because these sensors are tuned to the supercharger, then the exhaust... thru the computer... will read clan. Now when you reprogrammed the brain for the supercharger, that changed the timming settings and performance for air intake, however, your other sensors are still operating under original peramiters. Does that make sense? It is a cheap part, in comparison, and I know a few people who used it and it works. but for a complete description, check with the guys at the performance shop, since they will have to order the right one for your application anyways, i am sure they can explain it better....

markbark22 · 03-26-2007, 05:29 PM

yeah ok, i will definitley look into that today thanks again

75K30 · 03-26-2007, 07:21 PM

As long as we are talking about cheating the emissions test, I use nitrous oxide to do it. I spray through a jet I modified with only a .009 orifice. Since the test is measured in PPM, the scale is thrown off by the introduction of additional oxygen, thus a clean emissions passing 521 CI big block ford on race gas. Should hear that roller cam cracking those valves open and closed, with that idle we all know, and love, and watching those guys doing the test shrug their shoulders when it passes,,,,priceless!
You can trick the machine (sniffer) pretty easily by introducing more oxygen into the exhaust system, not to tricky, and easy to conceal.
Just thought I would share...he, he....

72'CaminoKid · 03-26-2007, 08:43 PM

lol. i can picture the look on their faces

bradrhale · 03-27-2007, 06:43 AM

glad you pointed that out. i have never thought about that until you said something. WATCH OUT!!

junior3382 · 03-27-2007, 08:22 PM

Quote:

Originally Posted by 75K30

As long as we are talking about cheating the emissions test, I use nitrous oxide to do it. I spray through a jet I modified with only a .009 orifice. Since the test is measured in PPM, the scale is thrown off by the introduction of additional oxygen, thus a clean emissions passing 521 CI big block ford on race gas. Should hear that roller cam cracking those valves open and closed, with that idle we all know, and love, and watching those guys doing the test shrug their shoulders when it passes,,,,priceless!
You can trick the machine (sniffer) pretty easily by introducing more oxygen into the exhaust system, not to tricky, and easy to conceal.
Just thought I would share...he, he....

okay, thats funny, but does it work? and are there any lasting effects? i mean can it damage anything?

03-26-2007, 01:37 PM	#1
markbark22 Junior Member Join Date: Mar 2007 Posts: 7	Failed Smog I have a whipple supercharger on a 2000 silverado and i failed the test because of the computer not being able to be read. Any recommendations? thanks

03-26-2007, 08:43 PM	#8
72'CaminoKid Senior Member Join Date: Jun 2005 Posts: 2,756	lol. i can picture the look on their faces __________________ 99 suburban xlt 96 silverado 91 wrangler (my baby ) 08 Honday shadow 750 (my mistress)

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03-26-2007, 02:26 PM	#2
ikos10 Senior Member Join Date: Mar 2007 Location: york, PA Posts: 85	At any aftermarket performance shop, you can purchase a bypass regulator for your o2, and air mixture sensors wich should allow it read right from your computer.... I wouldn't nescesarily recomend this, but it has worked for a few people I know.

03-26-2007, 02:43 PM	#4
markbark22 Junior Member Join Date: Mar 2007 Posts: 7	Ok but the only problem im really having is that it has worked before by just re programming it to the trucks original specs, what will the bypass do and doesnt the programmer do that in itself ?

03-26-2007, 05:29 PM	#6
markbark22 Junior Member Join Date: Mar 2007 Posts: 7	yeah ok, i will definitley look into that today thanks again

03-26-2007, 07:21 PM	#7
75K30 Senior Member Join Date: Jul 2006 Posts: 2,992	As long as we are talking about cheating the emissions test, I use nitrous oxide to do it. I spray through a jet I modified with only a .009 orifice. Since the test is measured in PPM, the scale is thrown off by the introduction of additional oxygen, thus a clean emissions passing 521 CI big block ford on race gas. Should hear that roller cam cracking those valves open and closed, with that idle we all know, and love, and watching those guys doing the test shrug their shoulders when it passes,,,,priceless! You can trick the machine (sniffer) pretty easily by introducing more oxygen into the exhaust system, not to tricky, and easy to conceal. Just thought I would share...he, he....

03-27-2007, 06:43 AM	#9
bradrhale Senior Moderator Join Date: Apr 2006 Location: Texas Posts: 8,021	glad you pointed that out. i have never thought about that until you said something. WATCH OUT!!