Need some help please
Reply #17 –
Stacks the emission numbers are set up by the FEDS then the states can make them easier when adopting emission regs. (Other than OBD2) And they can pick the way the vehicle is tested. Like i said . The feds use an IM 240. That is why people remove emission devices and pass local tests. It is different for every car as to it"s transmission axle ratio engine option and weight of the vehicle ETC. Example a 3.8 Cougar compared to lets say a 5.0. And a 2.73 compared to a 3.73 final drive. And every year is different. Example years back i had a Pontiac 9 passenger wagon when the kids were small. It had a GVW of 6800 LBS. That car had to pass phase 2 emissions which allowed my numbers to be higher than one that is under 6000 GVW., Like i said every car and year is different. Bottom line hear is the states can and do reduce the numbers lower to an unreasonable number to meet as designed but normally do not use an IM240 standard. It is a scam and there is nothing we can do about it because every car was designed to meet IM240 when built. But at least OBD2 cars do not have to go on the DYNE. That is in my state i do not know about other states. So if you are correct in your statement different areas even in the same state can make you life miserable depending on there emission numbers. But basically an ASM 25-25 is the easiest test to pass. Also you said they time the test at idle. That makes no sense as to why. Normally an idle tailpipe test does not change and does nothing to see if the car is clean. As far as i know no state does an idle only test. Not 100% on this but that test is useless. Have a great Tuesday guys
Best example i specialize in Cosworth Vegas and have a big following. That car from the factory idles @ 1600 RPM'S. It fails every Emission test for high idle specks. In CT we had to meet with the law makers to exempt the car for non compliance on excessive idle speed. This happened in transition when ct first started tasil piping and went to as you come tailpipe test. So in CT idle speed on certain cars were exempt for excessive as designed. So there fore an engine pollutes much less when it runs faster. Not all the time but most of the time under 1500 RPM'S hope this explains it.
Stacks if you are talking NOX a roller test is is much better because the EGR does not work at idle!!! And normally most cars block EGR when not rolling in gear. Another words when the ECM does not see VSS it blocks the EGR from opening and the NOX goes HIGH. If you know lets say Tuebo coupes you know the EGR solenoid is on the passenger side firewall under the right front fender along with the over-boost sensor. It blocks vacuum to the EGR unless the ECM sees a VSS signal. Just an example.