First off i know this may be a rehash of some things but i have a few specific questions i didnt see answered in any threads partanaing to this topic. I am currently working on restoring the motor and exhaust system in a 86 Camaro with a 305 TPI motor. I would like to put in a complete new exaust system new headers pipe cat and muffler since the old system is pritty much shot with the exception of the old manifolds which are the only thing thats not pritty much completely rusted away. It appeasr the previous owner tried removing the air system that ads fresh air at the manifolds and twisted off several of the lines going into the manifolds. My question is can i just put new headers and a new cat that doesnt require air to it on it and instll the old o2 sensors in the new headers and junk the smog pump and air system. Yes i do realise technicley ill probably be breaking some federal mandate but for one where i live i dont have to get the car tested and if i put a new cat on it the car will probably run cleaner than it did before. That being said my only consern is if i dont have the air system ading extra air to the exhaust manifold will it throw off my readings at the o2 sensor? If so then can i reprogram the computer or do somethign with the o2 sensors to compensate for this, or am i stuck with having to keep the old style exhaust manifolds and fixing or replacing the part of the system that ads the air back into the manifolds? Oh also if i can just junk the whole system with no worries to the o2 sensors will the computer start throwing a code because i have removed the air system and the wires that went to the unit that sends air to the exhaust manifold and cat?

 

Nope. You are a okay. If you dont require emissions, then go ahead and remove it but still keep what remains in good condition. If you move, atleast you'll still have the parts and you can just look for the parts that you will need if you have to take a smog test. I have a 86 IROC but I stabbed in a 350 and repaced everything that needs to be replaced when doing a convert. If you buy new headers, make sure that the O2 sensor is close as possible to the original location of the OEM headers because the further down the O2, the cooler the exaust will be resulting in a false reading to the ECM. I took off everything because I dont require smog testing. I took off my cat, A.I.R. pump, air diverter valves and I dont get any troublecodes. Be very carefull though. You are breaking the law which can be punishable in a federal court. Applies to me too.

 

I have been looking for directions on how to do that same conversion. I found an A/C delete pulley but where should I go from there after I take out the AIR pump?

 

Depends. 1st, you need to tell us what kind of car you got because the engine compartments are different between years. For example, in my 86 IROC, my a.c. compressor would be on the driverside, not to mention that I have the old style belts, meaning that my system is not serpentine or single belt drive. Now on other Camaro's (TPI,TBI, V6 and carburated), everything is up, down, left, right, you get the picture. It would help a lot if you can provide a picture of your engine so that we can see what approach to take. Removing stuff from the engine is not really a conversion. We usually call it "deleting." Example, I have deleted the A.C. compressor and the A.I.R. system (smog pump and A.I.R. diverter valves). If you do decide to remove anything that is related to the emissions system, DO NOT THROW AWAY the pieces removed. You may need it later on down the road if the DMV requests a smog test.

 

I have a 350 tpi in an 89 Trans Am GTA. I will get a pic up as soon as I can.

 

89? Then my set up is different. You must have a 1 belt system (serpentine).

 

Yeah it is a single serpentine belt. The only thing I can think of doing is getting a smaller belt after I take out the pump. I guess I can measure it after I take out the pump to find the size but it would just be nice to know before I start removing things.

 

You dont need a delete pulley. Just run a 96.7" belt and youre fine. I removed a.i.r and egr this winter and my car runs great. Where the smog pump was i just put the bolts back in so it looks like a proper delete and doesnt look like there is something that was supposed to be there. All that it looks like is there could have been an option for something to go there or gm used that same bracket on another car which used that pump mount. I can send some pics if you want some, or i can coach you through it all.

-Tyrell.

 

i think im going to do this too. i love breaking the law anyway,lol

 

im going to be doing the AIR delete and the full a/c delete on my 87 TA whenever i can find a good deal on a set of non AIR headers, and an a/c delete box and HVAC controls.

 

Hey guys,

I have a similar problem that I ran into with my 1989 trans am gta. It has the 5.7l, 350 tpi engine. I recently bought headers and the full exhaust system to follow and Im thinking about removing the cat completely and replacing it with a pipe. If the A.I.R system is removed will the fault codes allow the engine (car) to run properly? I notice that the headers have an opening to connect the emissions lines to it. Can I plug up this open pipe on the headers and remove the system completely?

Will removing the CAT and the emission system free up a decent amount of power to the car? Please let me know if anyone has some advice. Thanks.

 

Yeah pics would be good and any advice about things that may have given you a lot of trouble. I am starting work on it in a couple days. The only thing I am going to need now is the belt. I am doing the fuel pump too so hopefully I can get it all done it one shot. I cant wait to hear how this car is gonna sound when I am done. Also what does removing EGR benefit? I never really did much research on it.

 

You get a tiny bit of gains. Removing the cat and installing a straight pipe will free up any restriction, but it is very small. If you look inside a Camaro's OEM cat, you can actually see straight through, if the cat is not melted. So even with a new cat, there really is'nt much noticable difference, maby a horse or 2. Plus removing the whole emission system will not throw any codes. Just dont remove the O2 sensor. You do need that.

 

I only removed egr because my valve was done, and i did proper research and found exactly what i needed to do. The big thing is doing your RESEARCH.
The reason why i did a.i.r was because i do not need it and i had a great deal on 2046 so i had them ceramic coated.
But ya when i get my braided power steering lines and fuel gauge mounted ill post some great pics of my whole intake swap and other winter mods. It looks great and i feel gave me a solid 50 hp, which is nice. I have recently beat a 1993 Nissan Skyline GTR and an 2003 Nissan 350Z with some pretty good mods!

But all in all im very happy with how my car turned out

 

50 HP Good for you. The difference is what you said. You have more mods. Im pretty much stock. The major upgrade on my TPI is a 94 Z-28 cam.

 

I HAVE A QUESTION FOR U. I JUST BOUGHT AN 87 IROC-Z WITH NO ENGINE OR TRANSMISSION SINCE IN GOING TO RESTORE IT & I GOT AN 88 IROC-Z TO THAT IM GOING 2 USE AS A PARTS CAR SINCE THE BODY IS BASICTLY NO GOOD. BUT THE 88 IS A TBI SYSTEM AN THE 87 IS A TPI I KNOW THAT I HAVE TO GET TPI SYSTEM SO I CAN GET THE 87 RUNNING. BUT MY QUESTION IS WHAT R THE SMOG EQUIPMENT THAT I NEED TO PUT ON IT? OR IS ALL THE SMOG EQUIPMENT THAT I NEED IN THE 88 ALREADY?

 

Watch it with caps. No need to yell. Smog diverter valves, Smog pump to catalitic converter tube, A.I.R. pump (smog pump), EGR valve and EGR solenoid, vapor canister, 3-way cat converter, exaust manifold stove tubes, and the O2 sensor.

 

NO OFFENSE BRO BUT DATS HOW I TYPE I JUS GOT USE 2 IT...OK THANKS BRO I APPRCIATED...OK COOL I HAVE EVERYTHING IN THE 88 IROC-Z THEN I WAS TRIPPING THINKING I MIGHT HAVE 2 BUY SOME MORE THINGS...I ALSO HAVE ANOTHER QUESTION FOR U...WAT DO U NEED FOR FOR A TPI SYSTEM? ALL I KNOW THAT IS NEEDED IS UPPER & LOWER INTAKE RUNNER THAT CONNECT TO IT, INJECTORS, FUEL RAIL, & MAP SENSOR...WAT ELSE DO I NEED?

 

Now it gets more technical. You'll need certain sensors (too many to list and there are different types of sensors for different apps). So it'll be wrong to list a sensor for a 86 IROC (MAF sensor) for a 91 IROC because 91 don't use MAF.

 

Look here for lots of info on TPI conversions:
http://www.chevythunder.com/

 

"...WAT ELSE DO I NEED?"

An education!
I hate ghetto speak

 

Don't expect much help with those caps. Besides, your not making yourself clear.

 

My apologies. I didn't realize you where quoting the other members comment with caps.