What is this pipe on the manifold?

Post by **PMan_S13** » Sat Aug 30, 2003 12:36 pm

I was scouting out for my turbo install and I found this small (maybe 1/2" or larger) pipe coming out of my exhaust manifold. It is in the rear and leads somewhere around behimd the block. I was kind of dumbfounded when I saw it cause I didn't expect it at all.

What is this small pipe? I would assume it is part of emissions? And what do you do with it when you put a turbo manifold on? do you have to make a bung for it or do you just plug it up or what?

Post by **91nis240** » Sat Aug 30, 2003 12:36 pm

ok if its the tube thats towards the top of the manifold it is the egr vavle , now if it is at the bottom of the manifold it is the aiv valve, both are emissions related

Post by **PMan_S13** » Sat Aug 30, 2003 12:36 pm

it is coming out of the number 4 cylinder .. uh.. I just blanked out as to what to call it. It's the exhaust pipe coming out cylinder 4.. it is bolted right into it.

Now what do you do about it for turbo? Just plug it up or what?

Cause right now my turbo mani doesn't have a fitting for this..

Post by **groundhogday1976** » Sat Aug 30, 2003 12:36 pm

That is the EGR tube. I've never seen a turbo manifold w/ a fitting for that. I guess people just take the tube off and block off the EGR valve.

Post by **PMan_S13** » Sat Aug 30, 2003 12:36 pm

I finally took a better look at it.. it is the EGR system.

What would be the best way to get rid of it? I would assume you need to disconnect it at the source.. that way it won't run rich cause the ecu thinks more air is getting in.

Will taking off the vacuum hose to the EGR stop a signal going to the ecu, or does the ecu just assume it opens?

I just want the turbo on with no fuel problem to begin with before I have to tune

Post by **PMan_S13** » Sat Aug 30, 2003 12:36 pm

*BUMP*

Someone give me an answer please.. I only have a few days left

Post by **deftdrummer** » Sat Aug 30, 2003 12:36 pm

your best bet would be to sell the turbo manifold you have now and spend a little extra to get the manifold that works right for your car. Not only that, but everything will hook up cleaner like its supposed to. On the other hand, your EGR valve (like stated before) is for emission standards. Hopefully you know already going into this that the SR20 doesn't pass smog anyways, so don't worry about that. As far as the turbo manifold, look on ebay and reputable places like http://www.heavythrottle.com and the SR20det swap page.

Post by **s14slide** » Sat Aug 30, 2003 12:36 pm

Well I assume from your profile and what you have given here, you are not going SR, but KAT. If that's the case, read on. If not, ignore me.

If this car is a daily driver, leave it there and have a connection fabbed up. It's not hard. It's for emmisions, and doesn't "hurt" your performance, and unless your going for something like a ten second street car I would make it work. It'll keep you from getting a CEL, and one less possible problem to deal w/ when tuning.

Post by **PMan_S13** » Sat Aug 30, 2003 12:36 pm

yeah, I am going KA-T not SR.. my questions wouldn't even make since if I was talking about the SR; everything is attached when it goes it gets dropped in..

Thanks for the opinions...but.. I have never seen a manifold with a bung for this and I have seen many pics here on the net without bungs on them.

I already know that I am at least going to block off the egr. Which will make it rich, but I know I can adjust the fuel curve for this. Right now I just want to know if the ecu adjusts the fuel because of a signal from the egr when it opens (if it does then killing the pressure line to the egr will cause it to not go rich). Or if the ecu just assumes that the egr is open and adjusts the fuel without a signal. If the later is the case then adjusting the fuel curve is the only way I can do this..

Post by **PMan_S13** » Sat Aug 30, 2003 12:36 pm

yeah, I am going KA-T not SR.. my questions wouldn't even make since if I was talking about the SR; everything is attached when it goes it gets dropped in..

Thanks for the opinions...but.. I have never seen a manifold with a bung for this and I have seen many pics here on the net without bungs on them.

I already know that I am at least going to block off the egr. Which will make it rich, but I know I can adjust the fuel curve for this. Right now I just want to know if the ecu adjusts the fuel because of a signal from the egr when it opens (if it does then killing the pressure line to the egr will cause it to not go rich). Or if the ecu just assumes that the egr is open and adjusts the fuel without a signal. If the later is the case then adjusting the fuel curve is the only way I can do this..

Post by **NISTECH** » Sat Aug 30, 2003 12:36 pm

remove only the hose between the bpt and the egr valve. leave the bpt and the egr solonoid in place. what the computer is adjusting for is basically a vaccum leak when the vavle opens. with out the vac line in place you now have a vaccum leak when the pressure in the exhaust closes the bpt valve. therefore the compensation the ecm makes will work out due to the bpt is still venting to atmoshphere. do not remove the bpt because the solonid comes on just off idle and your accel will be affected by usually a stumble the bpt delays the vent and allows the accel to be smoother.

as far as the egr valve it self. fabricate a plate to bolt into place over the intake port where egr bolts in and remove the valve and piping. I must note here though this is for "off road use only" it is not smog/emissions legal work. being a state licensed smog tech i could never recommend you drive the car on the streets like that;)

Post by **NISTECH** » Sat Aug 30, 2003 12:36 pm

keep in mind when doing what i suggested you will be shootin some serious greenhouse gases out your tail pipe. with out the egr function obviously your NOx emissions are gonna go through the roof then you add a vaccum leak to the mix it slightly leans out the burn which will further increase NOx emissions as well as HC emissions. If i where in your place I would fabricate a pipe to go from the egr valve and plumb it in just past the flange of the manifold in the header pipe.

Post by **deftdrummer** » Sat Aug 30, 2003 12:36 pm

PMan_S13 wrote:yeah, I am going KA-T not SR.. my questions wouldn't even make since if I was talking about the SR; everything is attached when it goes it gets dropped in..

Thanks for the opinions...but.. I have never seen a manifold with a bung for this and I have seen many pics here on the net without bungs on them.

I already know that I am at least going to block off the egr. Which will make it rich, but I know I can adjust the fuel curve for this. Right now I just want to know if the ecu adjusts the fuel because of a signal from the egr when it opens (if it does then killing the pressure line to the egr will cause it to not go rich). Or if the ecu just assumes that the egr is open and adjusts the fuel without a signal. If the later is the case then adjusting the fuel curve is the only way I can do this..

You obviously haven't seen my bung then. :thinker

Post by **PMan_S13** » Sat Aug 30, 2003 12:36 pm

What size bung is it then?

The problem I think is going to be lining it up perfect.. well I guess I can just bend that pipe that is there already.

Post by **SloS13** » Sat Aug 30, 2003 12:36 pm

Im just gonna bend mine and have it welded up. Im lazy

What is this pipe on the manifold?

What is this pipe on the manifold?

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