dZ28adams

a buddy of mine told me not to remove the egr valve on my dailt driven car because i will get carbon build up and my motor wont be able to breathe as well? is this true?...btw..i currently have the stock ex. manifolds and cats, so should i wait till i put on Lt's 2 delete those systems?

BIG_MIKE2005

iTrader: (116)

You can buy or make block off plates for the stock maifolds. I'm deleting mine when I put in my LT's. Never heard of adverse affects.

conan

iTrader: (5)

If you plan on getting LT's I would wait untill you get them. Also if you have the money get a ls6 intake mainifold at the same time. You will get a power gain and you wont have to mess with blocking off the hole in the intake for the egr. Removing these systems is mainly for cleaning up the engine bay (no power or performance).

prostock_bigblock

iTrader: (11)

I`ve been runnin my car with no EGR, AIR, PCV for a couple of months now and no problems at all .

brad8266

iTrader: (23)

Why take the PCV out?? The case needs to breathe

prostock_bigblock

iTrader: (11)

well I ran a breathers on the valve covers and the reason i ditched the system is I dont wana have oil in my intake , thats why ppl run a catch can or a truck valve , but seems to me that this is the best way to keep your intake manifold clean , I was hesitating about doing this but went with SU2BXU write up and everything went fine.

brad8266

iTrader: (23)

Got a link to the write up, I wanna check it out?

nokeman

iTrader: (30)

Wow ive never heard of any bad effects from removing the AIR system. But yeah I would wait untill you get new "race" style headers before you remove it...wait I am waiting till i get the headers before I remove it.

prostock_bigblock

iTrader: (11)

ya here u go

https://ls1tech.com/forums/showthrea...=451559&page=1 .

john shea

I've got two reasons why I am not removing either. Number one is I've
seen a lot of threads that after block off plated the fitting blows off
header and your left with a hole and number two is my tuner said the
engine was designed to run with egr and should remain there.

TheBlurLS1

iTrader: (8)

They must have slipped by me somewhere. Why in the hell would it blow off with a blockoff plate and not blow off with the system bolted to it? The AIR system has check valves that "block it off" and the EGR valve closes at WOT.

You need a new tuner.

d james

I'll tell ya how they blow off. I didn't have any blockoff plates for mine so i put some folded aluminum can metal (folded very thick) This was temporary so I could drive it a few days, well after those few days they blew off. Well half was still attached to them but on bolt hole came out. The thick metal block off plates will certainly not blow off.
As for EGR and AIR I've heard that not having AIR will shorten their lifespan because when the air comes on at first startup the fresh air lights up the unburned exhaust better, without the air the cats don't work as well at the cold start up temperature, and so they start to clog up faster from the richer mixture. I imagine it would take a long time to kill the cats, so it might not be a big issue, but I wouldn't remove either unless your puting on headers, because your not going to see any improvement in performance. Like the other guy said, at full throttle the EGR doesn't work, so there is no point in removing it.

SeriousPWRTRIP

anybody have a write up on how to remove the AIR system? I have mac mid lengths and no cats, so the system is basically useless at this point.

Xtnct00WS6

iTrader: (8)

If you have cats, it's not a good idea to delete the AIR system. That's probably what ur friend was referring to. My understanding is that it helps to keep ur cats from getting clogged up. EGR is fine to get rid of regardless.

john shea

I mean the header air fitting actually blows off with bock off plates installed
and the egr is there for a purpose to cool gasses in cylinder.I've read threads
that say that the egr is there for a purpose to cool gasses because there
is not enough overlap in the cam on pre 01 cars. Check out the photos
of headers with holes because of using block off plates.

TheBlurLS1

iTrader: (8)

You're basing the probelm of the tubes blowing off on a few isolated cases, which would have probably happened even with the system still attached. See the top of post 11.

I ran block off plates on my stock manifolds, then gave them to a buddy who has them on a set of pacesetters. I've seen 500,000 people with blockoff plates and no problems. I've seen a *few* people (read: 1 or 2) who had their tubes blow off, one of them I KNOW still had the AIR system hooked up. The pressure would be nearly the same inside the tube no matter if it's working and hooked up, or blocked off. When problems happen, 99% of the time it's because of a shitty weld job, or someone has man-handled the tube while messing with the system.


The EGR system is an EMISSIONS device, used to cut down on NOx gasses. Removing it will not harm, nor help your performance. It was installed simply to keep the government off of GM's back. Your "cylinder gasses" being a few degrees higher isn't going to make a ****'s difference in a flood when you spin a rod bearing at 200k.