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Nov 08, 2005 13:06:44 (GMT -05:00) Eastern Time (US & Canada) Nov 13, 2005 00:00:00 (GMT -05:00) Eastern Time (US & Canada) No (click here to learn more about
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Script Details
Introduction : Performance and Emissions
All right, we’re here to talk about power and performance. When you think performance, you might be thinking of Tony Stewart pushing his way to the front of the pack coming out of turn two at Talladega. But we’re dealing with street legal vehicles, and that means there’s a catch here: emissions.
If you’re going to be installing performance equipment on street legal vehicles, you can’t just drop ‘em in there and say “here you go.” You need to know how that equipment got certified for emissions compliance, how to test that equipment, and how to understand what your test results mean. Sure this course is about squeezing that last ounce of performance out of a vehicle, but it has to be done legally.
Legal Add-On parts
Your add-on or modified parts, all legal mind you, are not just replacing originals. These parts are providing vehicles with new functionality.
All parts in the category have to get the thumbs up from an organization known as the Air Resources Board, or ARB. If the part doesn’t increase emissions, then it’s approved and is exempted from anti-tampering laws.
This exemption is called an Executive Order. The E.O. allows the part to be installed on particular, emission controlled, vehicles. When I say particular, I mean particular. These E.O.s are year and model specific. Each part gets a number, and those numbers are recorded and tracked. You can verify these numbers at Smog Check stations, BAR Referee stations, and on the California ARB website.
Let me give you an example: a part that is legal in a ’95 V-8 Camaro might not be legal at all in an ’89 V-8 Camaro. Or, how’s this? You put some new headers on your 2002 Mustang and cruise in for your emissions test. The guy running the test looks up the E.O. number and, oops, it’s for a ’98 Mustang. Guess what? You fail your test for having illegal parts on your vehicle.
Air to Fuel Ratio
The chances of a vehicle failing an emissions test because of an aftermarket part are much lower than the vehicle failing simply because of poor maintenance. We’ve all seen how some people take care of their cars.
However, a power and performance technician should always be aware that installation of aftermarket parts just might increase vehicle emissions. The good news is we have an excellent way to make sure that any repair, adjustment or installation resulted in a legally operating vehicle. We can analyze exhaust gases.
Before we can do this, and really understand the root cause of high emissions, we’ll need to review the basics of both combustion and of stoichiometry – the ratio of air-to-fuel burned by the engine.
The air fuel ratio ultimately determines the power the vehicle can produce. If the Air to fuel ratio is not optimized, you don’t get all the power available.
When you have your economy and performance in perfect balance, the ratio of air to fuel is 14.7 to one. This ideal blend of power and economy, represented by the ratio of air (14.7) to fuel (1) is called the stoichiometric ideal.
When the ratio increases above 14.7 to one, then your mixture is “lean.” That means there is more than that ideal 14.7 parts of oxygen that you want.
On the other hand, when there is less oxygen than that, the mixture is said to be “rich.”
And… no, holding your breath won’t make you rich Script:
Introduction : Performance and Emissions
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If you’re going to be installing performance equipment on street legal vehicles, you can’t just drop ‘em in there and say “here you go.” You need to know how that equipment got certified for emissions compliance, how to test that equipment, and how to understand what your test results mean. Sure this course is about squeezing that last ounce of performance out of a vehicle, but it has to be done legally.
.............
............
All parts in the category have to get the thumbs up from an organization known as the Air Resources Board, or ARB. If the part doesn’t increase emissions, then it’s approved and is exempted from anti-tampering laws.
.............
...........
............
Let me give you an example: a part that is legal in a ’95 V-8 Camaro might not be legal at all in an ’89 V-8 Camaro. Or, how’s this? You put some new headers on your 2002 Mustang and cruise in for your emissions test. The guy running the test looks up the E.O. number and, oops, it’s for a ’98 Mustang. Guess what? You fail your test for having illegal parts on your vehicle.
............
...........
..........
The chances of a vehicle failing an emissions test because of an aftermarket part are much lower than the vehicle failing simply because of poor maintenance. We’ve all seen how some people take care of their cars.
..............
.............
...........
Before we can do this, and really understand the root cause of high emissions, we’ll need to review the basics of both combustion and of stoichiometry – the ratio of air-to-fuel burned by the engine.
...................
...............
...........
When you have your economy and performance in perfect balance, the ratio of air to fuel is 14.7 to one. This ideal blend of power and economy, represented by the ratio of air (14.7) to fuel (1) is called the stoichiometric ideal.
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