I've searched the site for information regarding the removal of the smog stuff from the GEN II chevy engines LT1, L99 and how it affects performance and come up with basically nothing. I haven't looked on any LT1 specific sites yet so forgive me if this is a no brainer. In the past we always removed the smog stuff from engines because it was a drag on performance.
In the last couple weeks I've seen a few posts here that make me wonder if this is true for the newer engines. One post in particular was basically an advertisement for the new John's Cars LS1 kit where it was stated that removing the EGR prevents the computer from being able to retard or advance the spark like it's supposed to.
I don't remember exactly what the other post was but the opinion being expressed was that there's no benefit to removing the smog equipment from the new computer controlled engines and it makes them run dirtier, idle rougher, harder to start and have less HP. I have a 95 LT1 from a Caprice cop car that I'm putting in a 73 Z so I'm exempt from smog inspections and besides WA state doesn't have state wide inspections, only certain areas.
Before I do this though I want to be sure that it will improve performance. I have the complete donor car so I could salvage the evap canister but I really don't want to have to deal with it. So what's the true story here? Will removing the smog stuff and reprogramming the computer increase, decrease or not change the performance.
On my Lt1 I took of all of the smog parts and then I put in a new program in the ecu. No problems yet. So what all can be removed and what did you have to plug up? I am removing the drive train in the next week and will start prepping the motor soon. Before you spend money on that EGR block-off plate its just two pieces of metal, some aluminum, some steel, nothing special.
And on a LT1 nobody will really be able to see them so they don't have to be all that purdy. I removed the EGR and its vacuum solenoid, the air pump and the canister.
Trial fitted it tonight. Bummer about the crank bolt, that was just weird. If ya gotta tear it dwn ya might as well put in sone goodies. Are you going to chnage the cam too?
I removed the air pump, evap canister, EGR and the solenoid. Made HP at the rear wheels on a dyno last month. I did the same thing on my engine, over torqued the bolt and snapped it off. Fortunately enough of it was sticking out that I was able to work it out with out resorting to an ez-out.
I eventually had to redrill and tap the crank and insert a heli-coil to get it put together don't ask, it's a long story I'd rather not remember. Anyway it is possible to salvage that crank. Did you even put the alternator belt on? Sorry for the problems.The catalytic converter is responsible for the ignition and burning of engine exhaust gases which remain after the initial reaction occurs.
This product became standard equipment in the U. They help the exhaust gases become cleaner without a significant impact to the performance of the vehicle. The catalyst in this device uses platinum and palladium to turn the initial exhaust created by the engine into gases which are less harmful to the environment. Each vehicle releases hydrocarbons, carbon monoxide, and nitrogen oxides during the combustion process. The catalytic converter then turns the carbon monoxide into carbon dioxide while the hydrocarbons become CO2 and water.
The nitrogen oxides become oxygen and nitrogen. Although this is a clear benefit compared to what is normally created, the high levels of carbon dioxide still create a greenhouse gas issue. If you remove the catalytic converter, then this conversion process disappears. Your exhaust sounds better. The catalytic converter works like a muffler on the average vehicle.
Its job is to reduce the impact of the gases emerging from the engine due to the combustion and burning of fuel. This action muffles the sound of your exhaust in combination with the muffler on your vehicle. When the catalytic converter is no longer present, then the sound your vehicle emits is louder.
See below. You can generate more horsepower without it. Once the catalytic converter is removed from a vehicle, some models do experience a significant increase in power. This advantage occurs because the unit creates a source of back-pressure on the engine. Since the gas releases through the exhaust with added speed when the catalytic converter is not present, the engine can perform with its maximum potential since there is nothing left to hold it back.
You have access to more fuel options. Up until the s, fuel stations in the United States offered leaded and unleaded gasoline for sale. If you were to run leaded fuel through a catalytic converter, it would destroy the materials inside, rendering the vehicle useless. You can operate the engine at a lower temperature. When constriction occurs during the exhaust process, the extra work that the engine does to generate power creates more heat under the hood.
By removing the catalytic converter, you remove this constriction, which means you can operate at a lower operating temperature. You can achieve better gas mileage. Since the catalytic converter places a strain on the engine with its constrictive design, it must work harder to achieve the same energy than it does without the device in place. Removing it lessens this burden, creating a net effect where the engine can perform significantly better without working as hard.
That means you receive an improvement in fuel consumption which translates to an improvement in your overall fuel economy. Many have said the mpg gain is slight.
You can do it yourself. Anyone with some decent car sense and a few tools can take care of removing their catalytic converter at home. All you need to do is follow these three steps.
13 Removing Catalytic Converter Pros and Cons
You can do this if you have an O2 wrench available. Most auto parts stores have them or you can order one online. You cannot perform this action legally in several U.
You must follow a specific process to legally remove your catalytic converter in the United States. These guidelines are offered through rules that were issued by the Environmental Protection Agency. Several states, such as California, have strict laws on the books which prohibit the removal of a catalytic converter under most circumstances.All Classified forums require a Site Supporter subscription.
Welcome, Guest. Please login or register. News: All Classified forums require a Site Supporter subscription. I have an 87 TBI.
There is no smog check here. If the air pump is recirculating hot exhaust air back into the intake and with an extra belt having to turn the pump, I would think removing it would make a bit better performance and mileage. Perhaps even enough increase in mileage to offset the increase in pollutants my eco weak conscience wonders?
Thanks for the input. The AIR pump doesn't pump hot exhaust back into the intake. It injects upstream at the exhaust manifold and downstream in a dual bed cat. If you take it off you should still be able to pass emissions.
The A. But removing it will clean up the underhood clutter. There should be no temp sensor, however it may give bad readings to the O2 sensor, since if you take it off there will be less O2 in the exhaust stream. It may not give you much power to remove it, but may make it run lean all the time if you remove it.
Easiest way is to not mess with it unless you know how to modify tbi stuff. Now, i recently read that GMC engineers stated that the A.
What Are the Benefits of Removing the Catalytic Converters From Cars?
This info conflicts with what was stated in the Doug Roe Rochester carb book, chapter 9. At any rate, taking the A. But, i believe that removing the equipment is a violation against federal law, even if your state like mine doesn't care if you remove it.
So, in other words, you won't get caught and no-one will really care, but technically i think it is illegal. Dragon Junior Member Posts: Forums New posts Search forums.
Media New media Search media. Resources Latest reviews Search resources. Log in. Search Everywhere Threads This forum This thread. Search titles only. Search Advanced search…. Everywhere Threads This forum This thread. Search Advanced…. New posts. Search forums. Removing smog pump.
MG MGB Technical Emission Equipment Removal BBS discussion at MG-Cars.net
Some people say it will boost performance others say it will kill it. BlownFiveLiter have car, will race Nov 29, 3, 18 88 Chicagoland. It should boost performance slightly, since it removes some parasitic drag on the engine. I tossed this one in Tech, since it's not really a tuning question.Catalytic converters, which are responsible for igniting and burning unburned engine exhaust gases, became standard automotive equipment on all cars beginning with model year Although catalytic converters help to make engine exhaust gases cleaner, they are not without their minuses.
What follows is a brief list of the potential benefits of removing automotive catalytic converters. Cars that have their catalytic converters removed experience an increase in engine horsepower. Catalytic converters create a significant source of engine back-pressure due to the constrictive effects they have on exiting engine exhaust gases.
Removal of catalytic converters from cars allows exhaust gases to exit their engines much faster and at higher levels. Since catalytic converter removal allows for exhaust gases to exit a car's engine at increased speeds, engine back-pressure is reduced, which lessens engine strain. This reduction in engine back-pressure and engine strain enables an engine to work more easily, and thus reduces fuel consumption and increases gas mileage. Since removing a catalytic converter lessens the burden on a car's engine by enabling engine exhaust to vacate the engine more easily, a net effect is a reduction in engine operating temperature.
The more easily an engine functions and the less work it has to do results in less friction, less load and, ultimately, a lower operating temperature. Cars equipped with catalytic converters run only on unleaded gasoline. Lead-based gasoline, which produces more power and better engine combustion, quickly destroys the inner catalyst materials of catalytic converters.
Catalytic converters operate like car mufflers, whose sole purpose is to muffle the sound of exiting engine exhaust gases. Although catalytic converters burn unburned exhaust gases exiting an engine, thus making tail pipe emissions cleaner, they also further muffle a car's exhaust sound and bestow a somewhat timid, tempered exhaust sound.
Without a catalytic converter, a car's exhaust sound becomes a little louder, a little deeper and more distinctive. Lower Engine Operating Temperature Since removing a catalytic converter lessens the burden on a car's engine by enabling engine exhaust to vacate the engine more easily, a net effect is a reduction in engine operating temperature. More Fuel Options Cars equipped with catalytic converters run only on unleaded gasoline. Healthier Exhaust Sound Catalytic converters operate like car mufflers, whose sole purpose is to muffle the sound of exiting engine exhaust gases.Forums New posts Search forums.
Media New media Search media. Resources Latest reviews Search resources. Log in. Search Everywhere Threads This forum This thread. Search titles only. Search Advanced search…. Everywhere Threads This forum This thread. Search Advanced…. New posts.Why You Should NOT Remove Your EGR Valve!
The best thing it will do is clear your engine bay of clutter and make it easier to work on. Black 93 Fox Active Member. Jun 1, 1, 0 49 Vancouver,Washington www. I took mine out in December and havent had any problems yet. Black 93 Fox. Jan 15, 2, 16 89 41 Dallas, GA Visit site. What all smog equipment do you want to delete? Air pump: As said before, cleans up engine comparment, one less accesory for the belt to have to turn. Your going to need to plug the holes at the back of the head or your going to have one annoying exaust leak.
EGR: Codes might come on unless you do a delete kit. EGR is suposed to turn off at low vaccume, so no power gains but if can keep your intake cooler and cleaner since exaust won't be running through the intake manifold. Charchoal Cannister: It doesn't weight much, and keeps the fuel smells out of the area.Print this page.
This thread is from the archive. Currently it isn't even hooked up by the belt to the air pump, so it is doing nothing more than cluttering up the engine bay from what I can tell.
I think I have identified all of the pieces that can be removed, but I want to know if I can just plug the openings that are formed in other pieces of equipment by removing things like the gulp valve hosing?
Any benefit of removing smog equipment?
Also, the charcoal canister that takes the vapor from the carbs, can I remove that and plumb in a catch can and a return line to the tank, or is there more to consider there?
Hi, I think there is an article by John Twist in Lindsay Porter's book on mgb restoration regarding removal of American anti-smog equipment. Unfortunately I can only say 'I think' because my book is out on loan.
It might be worth contacting John Twist. FWIW Peter. Either leave the charcoal canister as is or remove it, vent the carb bowls to the air, plug the return line to the tank and install a vented gas cap. Peter's right - there are step by step instructions in Porter's book - page in mine, under the heading "'De-Toxing' US Cars".
I always thought that should be termed "re-toxing," since you're making the car more toxic, not less. I'm selfish -- I don't want to breathe your pollution. I also want to return the favor, so in exchange for you keeping your car clean, I maintain my emissions equipment on my car intact and functioning. I think that it's inconsiderate and irresponsible not to! Keep the evaporative emissions equipment -- it probably does the most to reduce emissions and has absolutely, positively, no effect on performance.
The gulp valve does not affect performance, because in normal operation it does nothing -- it's closed. It's only on overrun deceleration that it does anything. When the throttle snaps closed on engine overrun, there is high manifold vacuum, which opens the valve and admits air into the manifold, thereby reducing vacuum to prevent the mixture from going rich. The function of the air injection pump is debatable -- it pumps fresh air into the exhaust stream, which either: A.
Either way, it won't affect performance enough that you can tell by the seat of the pants. My car was missing all its emissions gear when I got it. OK, thanks for all of the info. I understand that the emissions control may only bring small, if any, performance gains to a car. I also kow that the emissions control that BL placed on these cars was a hodge podge effort and kind of an afterthought, I have read many debates on exactly how effective it really is.
I agree that I don't want to pollute the environment. As I work through the engine I will make a decision then on whether I want to remove it, or keep it and make it work. Rob, emmision controls on those years cars did about as much as spitting on a forest fire. Anyone not agree?