EGR valve yes or no?

[svopantera]

I am planning on getting ROd's header and was wondering whether I should get the one with the EGR coupling. I am not worried about emissions testing and I am also going to remove the cat.

Any reason I should keep the EGR?

[GAboySVO]

Since you are in San Antone and unless you are going to be using only race gas, I would recommend keeping the EGR. It aids not only in emissions, but in fuel economy and cooling the combustion chamber which is helpful in reducing the chance for detonation.

If you are making a race car, then disregard the above comments.

[KraigW]

svopantera-

A well-tuned car w/o a cat will pass emissions just fine and be far below acceptable levels for NOX, CO, and HC. Emissions will also be acceptable w/o the EGR, but . . . . there's a strong possibility you will suffer from detonation/pinging. For that reason, I would keep the EGR. My opinion- get the header with the EGR coupling.
If you decide not to got with EGR, you can always just plug the hole.

my $.02
-Kraig

[svopantera]

Woah Horsies!

San Antonio doesn't have emissions testing, that's why I am not worried about it. I was really only worried about any negative effects on the engine by removing the EGR.

As far as detonation and pinging, I have a 255 lph fuel pump and an adjustable fuel pressure regulator. Would that help with the detonation/pinging issue?

[140cilx]

I've gone w/o mine for 2 years on the SVO and 4 years on the other w/ no ill effects or pinging, and couldn't really tell a difference in my mileage. I did like that it cleaned up my engine bay and was one less thing that could become plugged or stuck open.

Actually I don't have any EPA stuff on my cars going back into the intake, my PCV and Valve cover breather are routed under the car.

My intake is nice and clean inside, which it wasn't when I bought it.

I made a cap for the intake and plugged the E6.

We require no stickers down here in N. GA.

[GAboySVO]

140cilx,

One thing you are overlooking is that west of the Mississippi river, you can only get 91 octane gas unless you happen to be in an area that sells $3 plus/gal race gas.

I had no pinging problems with my '86 while in GA, but when I moved west the poor gas forced me to replace my EGR and and unclog the EGR port in the intake.

[140cilx]

I knew I'd get my hand slapped.

I am certainly not saying you guys are wrong. I've simply gone without it and know a number of people who do. I defer to you guys on a great many area's.

Mike, I run synthetic, and change it at 3k, and seriously, my oil stay's golden clean the entire time it's in the car. I don't know why you'd suggest it would be otherwise? All I have done is allowed blowby to vent out of the car to the atmosphere rather than back into the intake. This has resulted in no drivability issues and no problems of any sort. I never even have to add oil between changes and have no drips of any sort. The blowby hose that runs by my bell never even drips on the garage floor.

-so I don't follow but will await the scoop.

[lonchair]

Re: EGR valve yes or no?

Originally posted by svopantera
I am not worried about emissions testing and I am also going to remove the cat.

Any reason I should keep the EGR?

If it is not an all out race car where every ounce of HP counts, why not leave the emmissions stuff on the car? You won't loose a ton of power and you'll keep the air better.

Also San Antonio is probably not that far away from having mandatory emmissions test. Travis County Commissioners (Austin) are gonna vote on testing in the next few weeks and that will leave San Antonio as the only major area in Texas with no emmissions test. I bet that won't last for long.

[svopantera]

Re: Re: EGR valve yes or no?

Originally posted by lonchair
If it is not an all out race car where every ounce of HP counts, why not leave the emmissions stuff on the car? You won't loose a ton of power and you'll keep the air better.

Also San Antonio is probably not that far away from having mandatory emmissions test. Travis County Commissioners (Austin) are gonna vote on testing in the next few weeks and that will leave San Antonio as the only major area in Texas with no emmissions test. I bet that won't last for long.

If there is one thing I have learned from living in Texas it is nothing happens to quickly here. "not that far away" in Texas time is probably 5 - 10 years.

[Pat_in_L.A.]

Originally posted by svopantera

As far as detonation and pinging, I have a 210 lfh fuel pump and an adjustable fuel pressure regulator. Would that help with the detonation/pinging issue?

On a molecular level, the answer is no.

You can bump up the fuel pressure all you want but it doesn't change the octane rating.

You can pour 8 gallons of 100+ into a tank that has 2 gallons of 87 octane and guess what heppens? The 20% of 87 flashes first and that's all it takes to light off the rest.

If you ever get a chance to talk to a chemical engineer from a major refinery, be prepared for an epiphany (sudden realization that everything you thought that you knew is wrong).

I love epiphanies. Giving and receiving them makes you feel like you either were just born or had just given birth.

Now where did I put down that Guinness?

[bob tweedy]

egr

hey yu'all. they dont call montana the "last, best place" for 'nuttin!
not only we have NO emissions standards but for some of us 'ol men(only the good guys) we aint got no taxes on the soddies nor the dirt and no taxes on the seedans
& pickups we drive!
bob

bring back muscle cars-ban low performance drivers

guns dont kill people-drivers with cell phones do

[vrinner]

Originally posted by Pat_in_L.A.
On a molecular level, the answer is no.

You can bump up the fuel pressure all you want but it doesn't change the octane rating.

You can pour 8 gallons of 100+ into a tank that has 2 gallons of 87 octane and guess what heppens? The 20% of 87 flashes first and that's all it takes to light off the rest.

So does than mean that if I'm mixing 100 unleaded (or 110 leaded) with 91 octane (50/50 mix), that I'm not really improving or lessening the chance of detonation? There are several threads talking about how adding some high octane will help the pinging. I know that my daily driver will ping on 91 (consistantly), but all I have to do is add a couple of gallons of 100, or even some octane boost and the problem goes away for a couple of tanks...

[bendutro]

That sounds a bit fishy to me. I see guys run mixed fuel at the track all the time and even I have mixed toluene+premium with a non intercooled turbo car and felt the difference driving it.

[GAboySVO]

I've read a lot about octane and octane ratings when I first moved to SoCal from Georgia and couldn't get any 93 octane.

From what I have read (on the internet) is the way gases are blended to get the state mandated ratings is mixing the basic components of gasoline with certain additives to raise and lower the rating. So it would be essentially like mixing a half tank of 87 octane with a half a tank of 100 octane in a 15 gallon tank would net you the equivilent of 93.5 octane rated fuel. The equations as I remember them is:

(octane rating x gallons used + octane rating x gallons used)/ total gallons.

example:

((87 x 7.5) + (100 x 7.5))/15

or

(652.5 + 750)/15

or 1402.5/15 = 93.5 final octane rating.

So Vince, in your case, you are at about 95.5 octane. Of course this assumes good gas and good mixing.

here is a good starting point if you want to research for yourself.

http://www.faqs.org/faqs/autos/gasoline-faq/

[Pat_in_L.A.]

Originally posted by bendutro
That sounds a bit fishy to me. I see guys run mixed fuel at the track all the time and even I have mixed toluene+premium with a non intercooled turbo car and felt the difference driving it.

Hey Ben. I'm just paraphrasing the best I can my real world experiences, having been a customer of Unocal and VP fuel engineers for over 2 decades. Thank goodness the engineers are not the salesmen.

I used to mix my own AvGas, add this and that to save money and try to come up with a cheap fix.


Consider your engine a doctor's patient.

This is your patient: Hmmmmm...
This is your patient well medicated by an expert: VAROOOOOMMMM!!!!
This is your patient on uncontrolled drugs: VAROOOOOM... KAPOWIE!!!