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I've heard of many people bypassing The EGR, what gains would there be? How hard is it to do? And what is required to do it?
 

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It keeps the upper intake manifold cool by preventing exhaust gas recirulation(EGR), thereby keeping a frash charge AND keeping the upper intake plenum cool. The cooler manifold keeps the air cool, and a cooler air charge has more o2 for more powerful combustion.

It can be done pretty easily, but it will trigger your service engine light. Still interested?
 

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The easy way to disable the EGR valve is to simply plug the vacuum line on top of it.

One step further is to completely remove the EGR valve, and on the 86 through 90 vulcans there is an EGR block off plate on the UIM from the factory(one per car). You can find these at a junkyard, that's where I found mine, and they didn't charge me anything because they didn't know what they were. I'm not sure if any dealerships will carry these, but it's worth a shot if you don't want to get dirty pulling your own parts. You can take two block off plates, use one to plug the manifold hole, and another to plug the feed pipe, and you will have completely removed the valve. This is the set up I have. Just make sure you remember to plug the vacuum line.

Don't expect huge gains, and don't do it if you get tested for emissions in your area.
 

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It should be right on top of your upper intake plenum, just past the trottle body. It kind of looks like a mushroom, with a vacuum line right on the top center. Also, just to make sure you're looking at the right valve, there should be a metal pipe(maybe 1" or 1 1/2" diameter) under it that wraps down and around into the rear exhaust manifold.

What year and engine do you have?
 

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If you're still not sure what the EGR is, go down to a parts store, and ask for one for your car, then after you check it out act like you don't want it. Or check in a haynes manual. It's on page 16 of chapter 6, section 17.

Also, if you have a problem with pinging(I've heard it's a problem with some vulcans), this mod might make it worse.
 

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um....wait...you guys are totally missing some IMPORTANT facts...

first: the egr is designed to help keep the CYLINDERS COOLER because there is less combustible material.....thus your engine runs better.

second: your egr is shut off automatically at WOT, therefore disabling it all by itself.


the only benefit i can see id disconnecting the vacuum line while at the track to keep the intake cooler while idling, but still not benefiting, because of the afore mentioned stuff.

so unless you don't floor it when you race, this is kinda a worthless mod.

Brad

EDIT: needed to run the spell check, and feel free to challenge my small amount of knoledge.
 

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Originally posted by the_spy_guy@Jan 19 2004, 06:08 PM
first: the egr is designed to help keep the CYLINDERS COOLER because there is less combustible material.....thus your engine runs better.

second: your egr is shut off automatically at WOT, therefore disabling it all by itself.


the only benefit i can see id disconnecting the vacuum line while at the track to keep the intake cooler while idling, but still not benefiting, because of the afore mentioned stuff.

so unless you don't floor it when you race, this is kinda a worthless mod.

Brad

EDIT: needed to run the spell check, and feel free to challenge my small amount of knoledge.
There is no EGR flow into the manifold at idle.

How do you equate cooler combustion chamber temps with the engine "running better"? Just how does the engine run better? You need to be more specific, I think!

The main purpose of EGR is to reduce the NOx emmisions, not to make the car "run better".


Mark
95 SHO
 

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you are correct, but yes i know what the purpose of egr is as do most of the people on this board. i phrased my statment wrong...where i said better, i meant more efficient, more emmisions friendly and cooler. I know my opinion is more of a personal opinion, but for the daily driver, i believe iit is a worthless modification due to the little to no performance increase.

Brad
 

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im not saying that it has no positive effect, but overall, FOR THE DAILY DRIVER i would not cap the egr. If this is a winter vehicle or performance car then you may want to. the reason is that the vulcan pings enough as it is, and in the summer, this would not help the situation (or anytime for that matter) as is explained below:

Quote from another web site:

EGR has been successful in reducing NOx in gasoline engines. When an engine uses EGR, a percentage of the exhaust gases are drawn or forced back into the intake, at the direction of the engine's electronic control module (ECM), and mixed with the fresh air and fuel the engine is ingesting.

The purpose of using EGR is to lower the peak flame temperatures inside the combustion chamber. Forcing some exhaust back into the cylinder slightly reduces the concentration of oxygen and slows the burning a bit, making things a little cooler. EGR also absorbs heat, further cooling the process.

End Quote

Now i know this information is not in debate, but i thaught it would illistrate in more detail, the purpose of egr.

mikehawk: i never said that spacers were a waste of money or even infered that they are. (personally i woud not invest in them). But that is totally personal opinion.
 

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I wasn't trying to put words in your mouth, just trying to think of a parallel mod to use as an example. No offense or anything.

As for the quote you used, it kind of argues in favor of disabling the egr if you think about it. Right here is what I'm talking about...
QUOTE
Forcing some exhaust back into the cylinder slightly reduces the concentration of oxygen and slows the burning a bit[/b]
That sounds to me like the opposite of nitrous injection. I mean, the way you make power is with the most power explosion you can safely achieve within the cylinder, and you're not going to be able to do that if you're sucking in inert gas that take the place of vital fuel and oxygen.

I can respect your opinion about the modification, I just don't agree with labeling it as a worthless mod.

And heck, I already gave a warning about engine ping and emissions testing, so it's completely at the discretion of the vehicle owner.
 

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I don't think what anyone can / will say will sway the argument. It's pretty much one way towards removing the egr. I personally wouldn't do it to my vehicle. Egr operation only comes into play during cruise speeds and will lower the cylinder temperatures. I'd much rather keep the air that much less concentrated with oxides of nitrogen than do something such as removing / disabling the egr system.
 

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heres a cool idea....put a swich in to cut the feed to the egr solinoid.....so for racing or times when you wish for performance, then flip the swich, otherwise, leave it in the "stock position" to do daily driving....

probbaly cost less than 3$ in wire and a swich...real easy idea!

what do you guys think?

Brad
 

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Might work, but I think the momentum was in place from the beginning that it will be done. (remove the egr system that is)
 

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You don't need the switch, because stock programming does that already. It cuts EGR flow at idle and WOT, but when switching back and forth the damage is already done. The point in disabling the EGR is to keep the manifold cool so that the incoming air charge will hopefully stay cooler longer.
 
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