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  1. #1
    derf's Avatar
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    Can a 1st gen (OBD I) Turbo SC2 pass state emissions testing (in general)

    So I have a nephew to whom I gave a 95 sc2. 233k body, 60K engine
    Have always wanted to turbo this car.

    Have always lived in a state where emissions testing is required -- 2 speed "idle" (steady speed") for the 95 as it is pre OBD-II.

    My question is whether it will ever pass emissions testing.

    Is the answer as simple as" yes" IF the turbo is not kicked in during testing?---meaning the additional fuel called for by the tune in turbo mode would not be called for, and the A/F ratio would be close enough to stock to not throw a code?
    If I was going to do this turbo, I'd prob swap out the cams (might as well go for it), which, I assume would fuck up the idle a bit due to the change in valve timings.

    My concern (in my head, which may not be anywhere near reality), is that with the more aggressive cam timing, the car's fuel management will have to be set up to use more fuel per charge than the stock setup.
    More fuel = more emissions
    Will it push it over the emissions limit, or are you counting on really thorough combustion and a happy catcon to save your ass?

    Or is this all just a (tail)pipe dream?
    1997 Saturn SC2 M/T 256k DD
    1995 Saturn SC2 M/T 234k given to nephew, just got parked fully functional -- slated for turbo
    2008 Saturn Vue XR A/T 103k 3-5-R then totalled at 5 mph
    1992 Saturn SL2 M/T 42k traded in to to get the 97 SC2 above
    ----------
    Everything you say to me
    Takes me one step closer to the edge
    And I'm about to break
    I need a little room to breathe
    Cause I'm one step closer to the edge
    And I'm about to break

    Shut up when I'm talking to you
    Shut up, shut up, shut up
    Shut up when I'm talking to you
    Shut up, shut up, shut up, shut up

  2. #2
    siris's Avatar
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    I've read on here from a few people over the years that their cars have passed NOx testing without issues.

    Then I've read some that sold their car because it wouldn't pass emissions.

    As long as you have a good cat and are conservative with fuel and timing, there should be no reason for it to fail.

    If it's a stand alone pcm you should target 14.2-14.4 AFR and 8-10* of timing.

    Being slightly richer than stoichiometric gives the cat fuel to burn off, decreasing HC levels.

    Conservative timing decreases NOx levels.

    If your running a stock PCM, just make sure the cat, o2 sensors, and egr are good.
    72 Charger: pissed me off, on jackstands.
    95 SW1m: Dohc swap. DD. I can haz boost?

  3. #3
    Resident Electromotive Expert importsdontlikeme's Avatar
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    I have passed the "sniffer test" with Gude .400" cams and my supercharger set up on my old coupe.

    I have always run Electromotive for engine management. They come with a check engine light output so if they need to turn the car off and back on to see that the check engine light works it does actually function through the TEC systems. They also offer TPS/MAP blend to help with lopey cam profiles at idle.

    If you need help with engine management don't hesitate to send me a message.


    Sent from my iPhone using Tapatalk Pro

    Interested in a solid engine management system? Ask me about Electromotive engine management.

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  5. #4
    Get off my lawn.
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    It should pass sniffer. The other tests are what you need to be concerned about, if applicable. Visual inspection can be a killer.

  6. #5
    derf's Avatar
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    Thanks guys. When I save up the cash to do this, I'll be posting in the turbo section of the forum after reading the whole damn thing first so as not to piss you guys off re-asking stupid shit
    1997 Saturn SC2 M/T 256k DD
    1995 Saturn SC2 M/T 234k given to nephew, just got parked fully functional -- slated for turbo
    2008 Saturn Vue XR A/T 103k 3-5-R then totalled at 5 mph
    1992 Saturn SL2 M/T 42k traded in to to get the 97 SC2 above
    ----------
    Everything you say to me
    Takes me one step closer to the edge
    And I'm about to break
    I need a little room to breathe
    Cause I'm one step closer to the edge
    And I'm about to break

    Shut up when I'm talking to you
    Shut up, shut up, shut up
    Shut up when I'm talking to you
    Shut up, shut up, shut up, shut up

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