ULEZ Compliance

[nicjwin]

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

[madras]

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?

[NSX 2000]

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.

[Heineken]

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

[NZNick]

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?