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Thread: ULEZ Compliance

  1. #1

    Default ULEZ Compliance

    As low emission zones increase it may be more difficult to drive around in our cars . Some time ago I read an article in the Autocar about getting an emission test to prove compliance with Euro5 . Then registering with TFL . Anyone have any idea if that’s possible . My internet searching has not left me any wiser .
    Nick
    97 Sebring Silver Ex Honda show car.

  2. Default

    I have successufully done this with Euro 3 car that has NOx value lower than Euro 4 - seems that is all tfl cares about. I found this thread as was looking to see if the NSX could be the same, clearly an 04 NSX 3.2 is compliant, so I wonder if we could get the NOx values for the NA1. I'm not sure on this but I think tfl would prob require at least a Euro 3 that has NOx euro 4 value, so not sure older NSXs would be considered Euro anything?

  3. #3

    Default

    One of the unique things about the NSX was that it meet and exceeded Californias smog test, so it wouldn't surprise me if it passed euro 4 values.

    There is chat about this on pistonheads as apparently there is a differance between the Birmingham scheme and the London scheme.
    2005 NA2 NSX, Berlina Black with full red leather interior.
    2016 NC1 NSX, Casino White Pearl with red semi-aniline leather and alcantara.

  4. #4
    Join Date
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    Default

    Some more information on the required EURO emission standards upon registration/homologation (with limits) can be found here: https://en.wikipedia.org/wiki/Europe...passenger_cars

    EURO 1 became mandatory for initial registration on 1st January 1993, EURO 2 in January 1997, EURO 3 in 2001 and EURO 4 in 2006. Homologation limits are one year less (1992, 1996, 2000 and 2005).
    EURO 2 should be possible (maybe changes in software?) since the engines up to 1997 were not changed significantly. My 1997 JDM NSX is registered as EURO 2, for example. The EURO 2 standard requires a shorter warm-up period and many cars with lambda controlled cat and low enough exhaust emissions were retro fit with a cold idle increase mechanism to achieve EURO 2 - Honda sold these for certain models.

    EURO 3 introduced NOx limits. The NSX engines were equipped with exhaust gas recirculation (EGR) at some point (don't know exactly) which is a way to reduce combustion chamber temperature and therefore NOx emission. The switch to EURO 3 (or 4, or both) could be related to this change but it's just an educated guess of mine ..
    Last edited by Heineken; 11-12-2021 at 09:18 PM. Reason: extended info
    1997 JDM Custom Order AT VIN 1400005 - Stock
    Heineken's Garage

  5. #5
    Join Date
    Aug 2009
    Location
    Dunedin, South Island, New Zealand
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    Default

    So my December 1999 LEV-status NSX is Euro 3, if I understand this right, and Euro 4 is what killed off the C32B NA2 & C30A NA1 (auto), as they couldn't be modified enough?
    December '99 GH-NA2 110 series - 6AS62 Type S in Monte Carlo Blue Pearl

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