EGR. Whats it do?
 

Wondering what it is used for. And the consequences of switching to a non egr intake, from say a regular quadrajet 305.

EGR= Exhaust Gas Recirculation. It lets a small amount of exhaust back into the intake tract during part throttle cruise and light/moderate acceleration to help lower combustion chamber temps and prevent detonation. A properly working EGR will actually gain you a small amount of power by letting you run more timing advance (on a mostly-stock setup.)

If you run a cam with a longer-than-stock duration and close or moderate LSA (i.e. the one in your sig,) then you don't need the EGR because valve overlap will perform the same function.

Thanks alot. Asked because of an argument with my cousin, and his Dad. Both are real backyard wanabees. When it comes to making power all they know how to do is grunt the word "bigger". Consequently his Dad talked me into the cam I have now when I didnt know nearly as much as I do now :o . I wish I would have went with one slightly smaller.

But anyway the kid has an 86 IROC with the 305 Q-jet, and he wants to put on a wiend manifold without EGR on an otherwise stock car. I told him with a car like that he should stick with an EGR manifold, but then couldnt explain why :p

okay couple things.....if you remove the egr and dont remove that section from the computer your car will act like the egr is functioning while its not there and can actually hurt your performance.

The other thing is that if you remove it best of luck to ya passing an e-test. I believe your NOX goes through the roof when you get rid of it.

I know that in Pa, even if you car doesnt produce excessive NOx and is in spec, than you still wont get a sticker because your car is supposed to have an egr.

oh yeah a lot of places have stuff like that but in places like ontario we only have to pass a sniffer no visual. However if the smog police pull you over and notice that any of the stock emissions equipment is missing youre in for mucho fines.