Ok, have 85Z28 with new built 305 with TPI. I
need to konw about the whole smog sys. I don't need it cause I live in one of those states. Well, does the smog stuff effect the motor? What all do I need to pull out? Will there be any ECM codes to worry about? The main reason of wanting to get rid of the smog stuff. Is beacuse it would cost to much to get it all fixed. Then all the lines and smog pump seem to take up much need space. Can anyone help?

 

The smog stuff will not slow you down or affect your mileage in a negative way.
Replacement smog parts are not expensive
compared to carburators, cams, headers etc.
It is illegal in all states to remove or disable smog equipment. Lazyness and irresponsability is no excuse. A sevice manual can show you how to hook everything back up. Learn how and why this stuff works
and you'll be three steps closer to going fast. A clean running motor is a powerfull motor.....

 

The funny thing is that all of the smog equipment on computer controlled cars not only makes the exhaust cleaner, the engine needs everything to be in good working order to operate normally. If you want to dump your smog, you'll need to get a non computer controlled carberator, cause the feed back Q-jet goes to full rich when there is no signal to it. Also, if you disconnect anything, the computer will show a trouble code,(check engine light) and go into closed loop where it thinks that your car is just warming up. Even after driving for miles. Also, your fuel milage will severely drop. Your timing wont advance either. I speak from experience.

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'82 Firebird, dead stock, 9 bolt disc rear, over 200,000 miles and still going strong, more to come...
http://www.spinfrenzy.com/stingerssx...easures.html#4

 

Your absolutly right. The smog equipment
and other engine managemant stuff (air/fuel ratio, ignition timing etc) are all tied into each other. The computer monitors
and adjusts all of these systems to make the motor operate the best within it's programing. Disable or remove any of this stuff and you'd need to re-engineer the rest of the system to make it run a good as before. It's really false economy to rip the smog equip. off.

 

Whoa- what cars are you guys working on? You can remove the smog pump air pipes and hollow out the cat with no issues from the computer. The O2 sensor is before the cat, so gutting it is not an issue, and the AIR diverter (The box over the pass valve cover) has no way of knowing if it is hooked up or not. The EGR will cause problems and some argue that makes the car run better, but it is a PITA (Don't believe me search EGR in the general tech forum and see how many people have had major troubles getting these fixed.)
True though is that you will not gain a bunch of horsepower from pulling all this stuff off, and it is cool to see a car running fast while being fully emmisions legal. If you are going to pull it, do it to make the engine bay cleaner and a little easier to work in.

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-='89 Iroc-Z - 350 TPI =-

 

I removed all my smog equipment. The car runs great still. If anything it runs better not worse. The gas mileage seems a little better but not sure about that one yet. You will clean up the engine bay and make it easier to work on the car. I even pulled all the spark plugs to see if they were running rich, and they were all perfect. The way I look at it is there are alot more polution problems out there than us taking off our smog equipment. I think if it was so much of a problem, all states & counties would mandate that smog equipment be placed on all cars even those prior to 1982, which in my opinion are worse than our cars with the smog equipment removed. And every state or county wold mandate emmision checks. To each his own. Like I said this is only my opinion. Also keep all the parts incase you want or need to put them back on.
Take care
Mike

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Check out My Car Pics http://albums.photo.epson.com/j/Albu...667&a=13599419

Gran Turismo Americano "The Ultimate Firebird"
Smokin 1989 GTA- Bone stock except for exhaust. (no catalytic-stainless pipe into Flowmaster 2 chamber) & AC Delco Rapid Fire Plugs; Removed Smog Pump and all other Smog related parts.

 

well i dont claim to know everyting there is to know about a the carbed motors, but i can tell you that on a TPI motor it doesnt matter if you take the AIR pump and tubes off. now i think it may have a bad affect on your converter, but mine was hollow when i got it, so it doesnt matter. as for carbed cars, my dad had a monte SS, he took all that stuff off and that thing ran like a top. no problems at all. to my knowledge all the AIR pump does is inject air into the exhaust stream to help the converter burn off gasses. the EGR valve and other devices need to be in place, but the air injection pump can be taken off wihtout major negative consequences.

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86 IROC
43,000 miles
305/700R4/3.23 gears
maroon, gold stickers, black interior, T-Tops.

current mods.
shift kit
headers
cat back exhaust

mods planned for this winter
cam
Adjustable fuel pressure regulator
port and polish intake and heads
lookin to run low 14s maybe squeak out a 13.9 with my stock chip

 

I agree with those that had no problems. I removed everything except EGR and charcoal canister system. And I know that on removal of the smog pump that on a 850 mile trip that I made most weeks for 18 months that not only did the car feel better, I was using a half tank less fuel. I could extend my mileage before fuel stops and do one less stop resulting in a faster travel time. Also cheaper on the pocket.
NB. On my car the pump had its own belt so when disconected it meant one less belt to drive.

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84 Trans Am HO L69 WS6
5 Speed manual
Vortech Cherrybomb no cat
JR Headers
Comp Cams XE262H-10
Removed A/C A.I.R. Hdflap
H/made tri cld air induction
K&N
Underdrive pulleys
Otherwise STD
Currently painting

 

I am interested in removing my AIR system also. Am I right that this will have no negative effects on hp? What about trouble codes?

 

No trouble codes on my car. If anything a hp increase imo because one less pulley to turn.

 

No Codes, better mileage. Certainly not any less power.

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Check out My Car Pics http://albums.photo.epson.com/j/Albu...667&a=13599419

Gran Turismo Americano "The Ultimate Firebird"
Smokin 1989 GTA- Bone stock except for exhaust. (no catalytic-stainless pipe into Flowmaster 2 chamber) & AC Delco Rapid Fire Plugs; Removed Smog Pump and all other Smog related parts.

 

I rarely light a flame anywhere (especially a great place like this!), but after reading this sort of thread over and over, I have to ask: why is it that every time someone asks an innocent question about the relative value of the emmissions control equipment, some goofballs (sometimes inexperienced, with bone stock cars) always feels the need to regurgitate the bulls**t that the EPA and state emmissions control people publish?

Every time a controversial limitation is imposed upon our vehicles, the environmentalist faction is quick to tell everyone that it's good for us, because not only are we saving the planet (not always true), but we'll get better gas mileage too!

The emissions stuff is there because manufacturers were FORCED to put it in starting back in the 70s, at extreme cost to engine output! Computer-controlled fuel injection makes for better performance, so, sure, you want your ECM and its sensors happy, but I don't think that means you can't take the AIR/EGR (and cat) out of the mix, if you know what you're doing. Despite what EPA and state talking heads may say, this stuff wasn't installed by GM to lower your ET and give you better gas mileage.

OK, I'm done.

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Joel Geerling
Red 91 Formula, 305 TBI
Edelbrock 14x3 open element
TBI 1/2" spacer
Hypertech street chip
Crank/Alt Pulleys
*
Exhaust is next!

 

Some people are just a little more sensitive I guess about this subject. Thanks for all the info that helped me..

 

Joel, these boards are here for input, advice, opinions and help. That is why on my post it says "This is my opinion" and "to each his own" If you don't like what you read, than remember,it is someone elses OPINION, or experience with it. Not everyone here has a major in 3rd gens.
take care
(Bone Stock)

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Check out My Car Pics http://albums.photo.epson.com/j/Albu...667&a=13599419

Gran Turismo Americano "The Ultimate Firebird"
Smokin 1989 GTA- Bone stock except for exhaust. (no catalytic-stainless pipe into Flowmaster 2 chamber) & AC Delco Rapid Fire Plugs; Removed Smog Pump and all other Smog related parts.

 

Yeah, I've heard all of the "I did it and I haven't had any problems".

The air diverter valve has an electrical conector on it, and when I took off my air pump, in both my T/A, and my 81 Elcamino, I got a check engine light on both. Yes the EPA is who made car makers install emissions equipment, but car makers made it work for them, and not against them. In the late '70s, if you had an older car that didn't have anything on it, you had to add it to your car, wether it came with it or not. That's why if you remove certain components of the smog systems now, your car won't run as well.

The cat is only neccisarry for the visual exam. If you put a glow plug from a diesel engine in the tail pipe, you'll pass the sniffer, cat-less.

But if your computer goes into closed loop, you will be running inefficient. Removal of some of the smog equipment won't neccissarily make you go into closed loop, but it just might.