All it does is allow the exhaust gas back into the cylinders, right? It helps for emissions but doesn't it suck for performance. Wouldn't it be better for that exhaust gas to be replaced with fresh, oxygen rich air through the TB. I know it cools the combustion chambers too by not allowing a full air charge into them and thus reducing the amount of oxygen being burnt by the fuel. This cooler combustion chamber allows the computer to advance the timing without detenation, but most of us on this board already run 93+ octane gas with a cooler thermo and fan switch. These mods alone will reduce the engine's tendence to dentonate. So why run the EGR valve when we're spending hunderds on new heads and cams to get every last bit of air into the chambers??
Thanks!!

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1989 Iroc-Z L98 Original engine-58K miles!!

SLP 1 3/4 SS headers, Hooker Areochamber catback, no cat, BBK AFPR, Hypertech 160* fan switch, ported and gasket matched plenum, TB coolant bypass, relocated MAT sensor, screenless MAF sensor, K&N filters, Accel cap and rotor, Taylor SpiroPro 8mm wires, Bosch Platinum plugs, Mobil 1 Synthetic 15W50 motor oil, and more to come...
Best ET- 14.24@96.76MPH / 2.17 60ft on street tires with the crappy B/W 2.77 gears.

Homepage currently under construction: http://www.iit.edu/~wicktho/len

 

No you don't need an EGR valve because you never have any gas to drive your car and you make me drive you around instead

 

Another thought...Exhasut gas it hot, damn hot comming right out of the cylinders and then it is pumped directly into our cool intake charge which then heats up and further decreases performance and raises chamber temps!! I don't follow the EGR bs at all. All it does it make it look like the car is cleaner than it actually is.

 

Is this corrector am I missing something?

 

You don't really need one. Unknown by me until a few months ago, a lot of aftermarket chip burners disable the egr.

How I found out was by accident. There is a successful, local, Blue Oval chip tuner who wanted to break into the GM market. I let him experiment on my car with different chips. We used both my stock, and Fast Chip (Ed Wright) chip as a baseline and aftermarket comparos. In his experimenting he had the advantage of using a dyno with wide-band O2. He tuned an addtional 15rwhp and 15rwtq above my Fast Chip. I was ecstatic! The only fly in the ointment was a constant code 32 that was being thrown. We tracked it down to the egr being diabled on my Fast Chip. I even called their tech line and verified that with them.

What else dawned on me was I had passed my emissions test a couple months earlier with the car's egr disabled.

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Mike

'90 IROC-Z, 5-speed, ZZ4, Trick Flows
Moderator SEThirdgen

 

actually the EGR valve helps reduce temps in the combustion chamber and therefore allowing for a more advanced timing. No, you don't need it and there are a few others on this board with chips that disabled their EGR valves. Do a search for the EGR valves and you should find a good article on where someone goes into great detail on the function of a EGR valve from a few weeks ago.

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1988 TA 300+hp 350 w/ TBI and Holley TB unit, Holley projection intake,
WC T-5, 3.42 gears w/ Auburn posi. MSD 6A, edelbrock TES headers, dynomax 3" cat and cat-back system, ACCEL coil, polyurethane bushings all around, aluminum driveshaft, Mr. Gasket open air cleaner.

1993 S-10 w/ 4.3L V6 TBI, slightly bigger cam, Mild polish job and 3 angle valve job on heads, Edlebrock TES headers, Dynomax cat back, MSD 6A, ADS chip

2000 Kawasaki KX 125

 

Slow,

You can live without an EGR, but you'll have to do something about the temperature diagnostic sensor input to the ECM. As the Reclining Reptile suggests, an aftermarket or custom PROM can disable the EGR lines in the programming. The only disadvantage you might have is that you will not be able to enter Highway Spark mode without getting some knock counts. This may affect fuel mileage at cruise to some minor degree. This can also be tuned out by a good PROM program.

The EGR doesn't cost any power, since it isn't even operated when at higher throttle angles or from low RPM launches. The TPS has to be relatively low and the engine RPM higher (low-power cruising) to enable the EGR. In essence, if the EGR is working properly, it doesn't dilute the intake mixture until you are putting along at 2,000 RPM with the foot just barely on the throttle. It should never open on a ¼ mile run with the stock programming.

If you are changing the intake system to one that doesn't have an EGR provision (like a mini-ram), that is a different story. If that's the case, you really should be considering a custom PROM anyway. If you decide not to install the external EGR system, have it programmed out.

Since you didn't mention why you're considering deleting the EGR system, I can presume it is in an attempt to make more power with your existing setup. You'll be disappointed with the results, since there will be zero performance gain from doing so.

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Later,
Vader
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"Make Me Bad"
Adobe Acrobat Reader 4.0

 

Vader,

The reason why I want to disable the EGR system is that my valve is not functioning properly and I presume that is why the car shakes at idle. I'd rather save myself $80 and fab up a block off plate.

 

Hey guys. I just got wieand stealth intake which has no provision for EGR. Since my car is 84 Carbed the computer doesn't really run anything except for timing. Since there is no sensor on the EGR and no knock sensor on the car I would assume without the egr valve that there would be no change in the way the computer operates just maybe a bit higher temp since I'm not running a cooler thermostat yet. Am I right?

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John Chamberlain
1984 Sport Coupe Camaro, 1979 350. Dynomax 2 3/4" cat back single in dual out muffler. Have Heads, Weiand Stealth intake, IN process of rebuild on 350 (355 all that good jazz) saving for Transmission THEN PAINT!

The Allmighty Warrior Court Jester of The Not-So-Famous Cascade Crew


[This message has been edited by 84FBODY (edited October 23, 2000).]

 

I'd like to get rid of my EGR and AIR system to clean up the engine bay. A/C is going too. Can you buy an EGR blockoff plate? My fabrication skills suck.

Bry

PS. as I shop around today I'm learning that non-emissions parts are LOTS cheaper than emissions-certified parts. Another reason to can all that junk.

[This message has been edited by Bry in Virginia (edited October 23, 2000).]

 

Yes you can, check out:
http://www.tunedport.com/



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86 Camaro Sport
383 Speed-O-Motive Crate Engine, Trick Flow Heads, 58mm Accel TB, 3.73 Auburn Pro, SLP Cold Air Induction and Headers, Dynomax Cat-back, Serpentine belt setup.

http://64.176.105.239/octride.htm