as you can see in the picture on the number 6 and 8 cylinder are being starved for air also if you look closely you can see that this is causing the air to have a swirl effect by the raised part where the egr has to clear, the parts in red i basically want to grind down to nothing, and also the egr enterence so can i grind down those parts, also where the egr sits the green part any way of getting rid of it besides welding a new plate on?

 

well you could take off the intake... flip it over... fill it with JB weld, make sure its smooth and flat... let it dry.. then grind out what you dont want on top..


just out of curiosity, how do you know they are being "starved of air"? do you have any test readings or something else?

 

if you look closely you can see swirl marks caused by those gaps so you know its not very efficent

 

Yes, but, the S/R intake plenum was designed to take effect of the angled T/B entrance, and the air that flows in is actually being "rammed" into the bottom of the lid, and then into the runners. I am no calculus major, or anything like that, but this was always my understanding. If I am wrong, please correct me.

If anything, if you are not using the EGR anymore, you can have the two holes, directly behind the T/B opening, that are in the plenum floor, welded up. This would stop the contamination of your fresh intake charge. If you are using heads, like , Brodix Track-1s, for instance, you can leave the holes alone, as there is no EGR crossover provision in the heads anyway.

 

I capped the holes and ground them down.
I also did some smoothing of the runners.


I'm still looking and if anyone has picts I'd like to see a direct port nitrous set up on one of these SR's.

 

what are the red circled holes for? Neither of mine have a plug in them. Should they?

 

Read the 1st post again.

 

Yes they should be plugged. These units are cast and the way you get a tube while casting is to place a material that the metal can form around. They then clean that material out and have cast in bungs (extra material) and tapped them for our convenience.
The tube is to route the EGR gases near the TB. After capping you should insure the passage is clear using an air hose.

 

It is hard for me to tell, but the area with the plug right next to the EGR hump, did you grind that down flat as well? or is a little still sticking up?

Something I have been wondering, would there be any tiny difference if one was to remove all casting flash from inside and polish it smooth?
I guess at the very least it would slow down some carbon buildup?

 

If you grind that hump down you will grind another hole into the plenum. It happens to be right in front of 5 & 7 intake but that's how it's made.
I polished, as best I could, all of the inside of the plenum and runners. I doubt if polishing really helped like you said but smoothing the flow between the plenum and runners is a must.
I was worried about modifying such an expensive part so I called the Accel hot line and found out that all the SR's they install have been cleaned up like what I did.