85vet

First - Merry Christmas to members
Second, I decided to take some pics of my new AFR 195 and compare the intake ports to the Felpro 1205 and the Sram ports.
AFR195 to Felpro 1205 gasket


SuperRam Intake to Felpro 1205 gasket


There is definately porting possibilities!!!

NOW, here is the question????? What about the EGR?? There is no port on the heads for the egr port on the SuperRam.

What do I have to do to either eliminate the EGR or is there another means to allow it to function??

Thanks in advance for your assistance.




[Modified by 85vet, 8:16 PM 12/25/2002]

lcvette

85 vette,
i would imagine your not running a stock cam.... am i correct? if so... what is the specs on your cam? if they are anything reasonably high performance oriented, the overlap on the cam lobes will render the EGR useless and therefore can be eliminated. if you are in strict smog location, i suppose you already have trouble with passing.. if not can it, its only excess parts under the hood to maneuver around!

Chris

85vet

lcvette,

I will be running the Accel 74219 cam w/ 6:1 roller lifters/rockers.

Duration 1.6:1 Lift Lobe Sep
219/219 .560/.560 112deg

Do I have to disconnect the EGR - vacuum and block, wiring of egr.
I was going to leave it on even if it doesn't function to look stock.




[Modified by 85vet, 12:29 AM 12/26/2002]

scorp508

Don't worry about it. Corvette uses an external EGR scavenging system compared to Camaro and Firebird which used internal EGR passages in the heads to the intake manifold. All we have is that little tube off of the exahust manifold that runs to the intake manifold in front of the distributor.

bill mcdonald

you dont have to do anything, just put it together with the EGR.

The egr gas goes from the exhuast cross over on the exhaust manifolds, through the base, into the runner and into the plenum where it is mixed in.

85vet

The internal EGR setup sounds like my system. Remember I have an 85.



[Modified by 85vet, 12:38 AM 12/26/2002]

tomcat-pilot

85vet- You are correct, your old heads circulated EGR up through a passage in the head and into the intake manifold to the EGR valve. The AFR heads do not have the passage, so you will need to hook up an EGR tube like 87 and up cars have. It is plumbed off the rear of the passengers side exhaust manifold (#8 primary tube) and the tube bolts into the port at the rear of the intake manifold near the distributor on the passengers side. If you are still running the stock 85 exhaust manifold, your options are to buy a used 87 and later manifold (e-bay has them all the time for cheap) with the egr fitting and an egr tube and heat shield or weld up a fitting to accept the egr tube on your current manifold or headers.
If you do not hook up the egr tube, the car will give you a check engine light and code 32 (if memory serves correct) because the egr temp solenoid will not detect the heat from the recirculated exhaust gas. You can have the check engine light due to no egr eliminated with a custom prom if you wish to eliminate egr entirely. Hope this helps.

vetracer

Are you sure it is '87 and up? My '86 has the EGR pipe going from the pass side exhaust manifold to the intake location discussed near the distributor. The only difference between my late'86 (alum heads) and '87 EGR pipe is that the '87 has a better design for the EGR pipe which is less prone to leakage. I changed mine over to the '87 design by buying a used pass side manifold and EGR pipe. If you go this route you will also need new gaskets to connect the pipe to the intake and exhaust manifolds.

I would bet that the changeover occurred when GM went to aluminum heads during 1986 production.

scorp508

Doh! My bad... I didn't realize the 85s used the internal system. :bb

From what I have seen 1986 and 1987 use the same EGR tube as far as I know. In 1988 they went to a new style that had 2 torx bolts on each end of it, instead of 2 on the intake manifold and a clamp on the exhaust manifold in 86/87.

tomcat-pilot

Yes, you are correct, late 86 (Aluminum head) had the egr tube. I said 87 and up to try and bypass the whole 86 early vs late discussion/confusion, but to no avail. I guess it would have been more accurate to state aluminum head cars are equipped with the egr tube. I would recommend the 87 and later exhaust manifold and tube setup over the late 86 design.

Cooter

Just for more fun and festivities, my early 86 has the external EGR tube :) Dontcha love GM!

eguyett1985

Yep, I ran into the same thing on my 85 with Dart Pro1's...I probably should have kept it but I just blocked it off and turned it off in the chip. Won't help me with the smog I have to do in a few months though. You could do like everyone else recommended and use 86-91 exhaust manifolds or headers and the y-pipe and cat I guess. Good Luck!

85vet

Thanks for all the input!!!!

I think I am going to block it off and I am sure the chip I have turns it off.

I put less than 5000 miles so I am not concerned with smog test :thumbs:

NHVett

My replacement heads also didn't have the EGR passage. I simply installed everything as though they did. No egr, also no 32 has ever been thrown in 2 years and I don't think Craig M. ever programmed my chip to stop the code. But maybe he did ????

89vette

I posted information on the Engine Mods section where you posted also. My cam has more duration than yours and I passed a PA smog test. EGR will not affect the test. Mine functions but it is disabled in the chip. I am like you since I also drive less than 5000 miles but had the guy do the test just to see if I would pass.

DRAGRCR1005

in order to pass the pa emissions did you have to run air pipes into the headers or the capped off. did you notice any power decrease when you installed the random tech. cats???

clem zahrobsky

the easiest way to raise the HP and TQ is a supercharger,it is not the cheapest but the surest,it always works. :chevy

bill mcdonald

so are we saying the 85 exhuast manifolds dont have a port for the exhuast to go back to the intake?

85vet

Yes - The 85's is intake and head internal.

My headers have the connection available - but I am going to eliminate the EGR. Not interested in upgrading to late 86 and newer egr system.