i want to run vortec heads on my l03.

i want to run an rpm air gap intake

i must keep my egr functional.

ha ha ha .... those 3 roads don't intersect.

i know i can get the exhaust output for the egr from one of the air tubes on my headers.

the challenge is ... how do i get the exhaust gasses into the egr valve, then into the intake?

i've often wondered why you couldn't simply drill a hole into the plenum and plumb the output of a remote egr valve in.

if that were the case, it'd open a lot of options like performer rpm, rpm air gap or even stealth ram or mini ram.

can anyone help?

 

First off there is nothing good about EGR, it sucks. I would think though, that you could bore into the intake and make it mate up to the EGR valve, with the use off a machine shop, or a dremel. but more than likely you'll wreck the intake.

 

i don't have any choice with the egr. i have to pass a visual emissions check, as well as a dyno test.

 

I dont even think that the Vortec Air Gap intake has EGR. So it would be pretty much impossible

 

that's correct. i'm trying to find out if there is a way to plumb the output of an egr valve into a non-egr intake.

v6 3rd gens, i believe, used a remote egr (one that didn't mount directly to the intake). i'm wondering if it'd be possible to adapt one of those or something like them to fit egr to a non-egr induction system.

 

I remember reading that Corvettes ran an external EGR and some late model trucks, run a search on it for "external EGR" and something should come up. It's definately do-able.

Good Luck
Tony

 

the external EGR on the vortec engines takes exhaust gases from the exhaust manifolds and feeds it into the intake manifold via an external hose. But the intake still has an EGR valve to regulate when and when not to feed the engine with exhaust. You could just tap into the RPM intake and draw exhaust gases from the AIR tubes on your headers but unless you have a valve youll have constant exhaust entering your engine which would hurt performance i believe. I would just go with an intake that has EGR because performance intakes and EGR just done go together. Worst case you go with a GMPP TBI or carb vortec intake with EGR. Not sure if Edelbrock makes a vortec intake with EGR and if they do it is probably just a Performer model.

 

i'm following you, but the difference in performance between a performer and a performer rpm air gap is tremendous. i was at a dyno shop a few weeks ago. a guy brought in a 78 camaro he'd swapped from a performer to an rpm air gap and picked up 42 rwhp! all he did was make a few jetting changes to the carb.

getting the exhaust gasses from the air tubes makes total sense.

you're right about needing an actual valve. iit's closed at idle and wot, so you get no exhaust gas in the mixture at those times.

i seem to remember 2.8 v6 fbodies having an external egr valve. i think fords do, too. if that's the case, all you'd have to do is plumb the output of the valve into the intake, wouldn't you?

aside from fitment issues, are there differences in how and/or where different egr valves open and close?

 

If you need to pass a "visual", why don't you mill a pad on the RPM-Air gap, drill and tap bolt holes, slap on an EGR, and put a vacuum line to it. The thing won't actually be DOING anything, but not IM pud will ever know that.

 

Genius. Will he still pass the sniffer though? I'm in the same dilemna. I want to get Vortecs and the Performer intake as well. I, too, need to pass a visual and sniffer even though our air quality is much higher than standards

-Rippin

 

Are you busting my ***** or are you being serious?

The car can be "tuned" to pass the sniffer part, w/o an EGR. I used to get my CFI and my moms 86 TPI to pass the sniffer in Mass w/no EGR. Here car even did it w/no Cat -though barely.

 

here they check the egr for function.

regardless, i'm going to keep the egr functional.

i was in a speed shop this weekend looking at a performer with egr. i just can't see why you couldn't use a vette remote egr and plumb a line into the plenum. it seems so simple, but the fact that it doesn't appear to be commonly done concerns me. if it was that easy, it seems like more people would be doing it.

 

Last question first. Probably not done as it is easier to just ditch the EGR.

As for adding it, the pre-90 v6 f-body's use a vacuum EGR that sits on a pedestal. The pedestal is mounted on the pass side exhaust manifold. There is a metal tube that goes from the EGR valve to the plenum behind the TB. ('90-'92 use a digital EGR).

These parts should provide the material you need.

To plumb it to the Performer air Gap just need to take in to account the dual plane-ness of the manifold. The best way would be to come in from the bottom, centered on the divider. This would give the cleanest look and an even distribution of the EGR within the manifold.

Could also come in from behind the plenum with either a hole on each side, or a single hole centered on the divider. It may end up with more EGR toward the rear cylinders, but I believe that most OEM manifolds also bring in the EGR from the back of the plenum(s).

RBob.

 

thanks rbob,

you know, i'm going to have to go back and look at the performer again.

it looked to me like the egr cam into the intake at the bottom of the passenger side of the plenum. if that's the case, then the driver's side of the plenum would get no exhaust gas. that can't be right, can it?

 

I'm curious of how to "tune" it to pass. When I swapped from 305tbi tp 350tbi, all I did was install hi-flow cat and retard timing afew degrees. You think this would also work with the vortecs and no EGR?