Emissions
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Joined: Dec 2004
Posts: 335
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From: Amarillo TX
Car: 89 Formula
Engine: 5.7 TPI
Transmission: 700R4
Emissions
I need to know what emissions bull I can take off and wont need. I'm not worried about it being legal, I'm doing it anyway. Also if anyone knows how to take it off, that would be alot of help.
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You can remove any of the "emissions bull" you want to, but may have disappointing results. I'm not sure what you would consider "emissions bull", but here are some of the things that the EPA quaifies as emission control equipment:
You can remove the PCV system, but since it is completely passive, you'll get no power or mileage gains. Moreover, your oil will get dirty and contaminated with water within weeks, so you'll get to change it more frequently.
You can remove the EVAP, but it is also a completely passive system and its removal will provide no gains. In fact, the fuel that evaporates out of your tank will end up costing you mileage and money.
You can disable the EGR system, but will gain nothing since it is again a completely passive system. It only operates at moderate throttle openings and at cruise RPM. However, removing it may allow the chambers to heat more than intended, which can contribute to preignition and detonation when you crack the throttle open fully. It shouldn't cause any harm, since the detonation sensor and ESC will pick up the knock and thus retard timing to protect the engine. Too bad that this retarded timing will cost you in power and fuel mileage.
You can remove the catalytic converter with no loss of performance or mileage whatsoever. However, unless the cat is undersized or restricted (damaged), you won't gain anything either. If it is restricted, you can either install a bypass/test pipe, or a high flow converter.
You don't have an EFE system on your TPI, so someone has already taken care of that one for you.
You can remove the air injection with minimal negative effects. You'll also get no noticable gains in power or MPG in doing so. At peak RPM, you might gain 1½-2 HP from not running the pump. There is something to be gained from the space it occupies, however.
In short, most of that "bull" has a reason, and some of it can actually benefit us in performance.
- Crankcase vent system (PCV);
- Evaporative control (EVAP) system;
- Exhaust Gas recirculation (EGR);
- Converter (Catalyst);
- Early fuel evaporation (EFE) for carbed engines;
- Air injection (A.I.R.).
You can remove the PCV system, but since it is completely passive, you'll get no power or mileage gains. Moreover, your oil will get dirty and contaminated with water within weeks, so you'll get to change it more frequently.
You can remove the EVAP, but it is also a completely passive system and its removal will provide no gains. In fact, the fuel that evaporates out of your tank will end up costing you mileage and money.
You can disable the EGR system, but will gain nothing since it is again a completely passive system. It only operates at moderate throttle openings and at cruise RPM. However, removing it may allow the chambers to heat more than intended, which can contribute to preignition and detonation when you crack the throttle open fully. It shouldn't cause any harm, since the detonation sensor and ESC will pick up the knock and thus retard timing to protect the engine. Too bad that this retarded timing will cost you in power and fuel mileage.
You can remove the catalytic converter with no loss of performance or mileage whatsoever. However, unless the cat is undersized or restricted (damaged), you won't gain anything either. If it is restricted, you can either install a bypass/test pipe, or a high flow converter.
You don't have an EFE system on your TPI, so someone has already taken care of that one for you.
You can remove the air injection with minimal negative effects. You'll also get no noticable gains in power or MPG in doing so. At peak RPM, you might gain 1½-2 HP from not running the pump. There is something to be gained from the space it occupies, however.
In short, most of that "bull" has a reason, and some of it can actually benefit us in performance.
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