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Old 08-26-2005, 08:57 AM
Bill Yarbrough's Avatar
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to EGR or not to EGR, that is the question

86 TPI 350 out a Corvette, completly stock going in an old Chevy. Do I want to use the EGR? The car is driven 20,000+ miles a year. What about performance and gas milage? Emissions are not a factor.

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Old 08-26-2005, 01:15 PM
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You would probably get more response if you posted this in the engine forum. Welcome to Hotrodders.
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Old 08-26-2005, 02:15 PM
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I would not use the EGR Valve, just block it off. As far as gas millage I doubt it will matter.

Steve
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Old 08-27-2005, 08:47 PM
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moving to engine forum........An EGR valve has no bearing on performance. Use it or not.....same HP output.
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Old 08-31-2005, 12:18 AM
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EGR only functions at part-throttle, so full-throttle performance should not be affected. Part-throttle fuel calibration is dependent on EGR, and if the EGR is not working, it may tend to ping a bit during light acceleration or heavy loading. If the engine has a knock sensor, it may retard the timing, which might tend to reduce performance.
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Old 08-31-2005, 02:04 PM
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From reading the above, if there is no effect, then why use it at all? Just more junk on the engine. I blocked mine with an alumn plate.
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Old 08-31-2005, 03:51 PM
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Quote:
Originally Posted by Jacks77
... if there is no effect, then why use it at all?
1) Because it does nothing to hurt power output
2) Because the computer will throw a code if you remove it
3) Because it is against federal law (and in many places state law as well) to remove it.
4) Because it will help reduce NOx emissions making the air we all have to breath a bit better.
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Old 08-31-2005, 05:41 PM
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Whatever you decide to do, make sure the chip "knows" what is going on. It has EGR dependent features. When all is said and done its almost easier to keep it.
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Old 08-31-2005, 08:48 PM
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Leave it in!

The EGR allows exhaust gas into the cylinder during the intake stroke and, amazingly and counterintuitively, LOWERS cylinder temperature. THis lowers emissions and, when operating correctly as it almost always does with fuel injection, makes more power at part throttle, basically all the time, for tha amount of gas consumed by keeping the A/F ratio close to ideal. Leave it in.
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Old 08-31-2005, 09:03 PM
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Quote:
Originally Posted by Bill Yarbrough
86 TPI 350 out a Corvette, completly stock going in an old Chevy. Do I want to use the EGR? The car is driven 20,000+ miles a year. What about performance and gas milage? Emissions are not a factor.
we were taught in school to push in the diaphragm on EGR (On Chebbie)
and if working the motor would stumble(Running at Idle)
like unpluging a vacuum port
if you got fuel inject and ecm hooked up
leave it alone
find better gas and power somewhere else
Like earlier posts stated
they are 100% right
make sure it works
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Old 08-31-2005, 10:30 PM
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[QUOTE=Triaged]1) Because it does nothing to hurt power output
Okay

2) Because the computer will throw a code if you remove it
Well, my 77 don't have a computer

3) Because it is against federal law (and in many places state law as well) to remove it.
Wrong! Depends on which state and how old your car is. Mine is 28 years and exempt.

4) Because it will help reduce NOx emissions making the air we all have to breath a bit better.
Well then, that's gonna wipe out 3/4 of the hot rods on this board that don't run the EGR...

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Old 08-31-2005, 11:07 PM
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Quote:
Originally Posted by Jacks77
3) Wrong! Depends on which state and how old your car is. Mine is 28 years and exempt.
Your car needs to be 68 or older (66 if it is a CA car) to be exempt. http://www.shadetreemechanic.com/smo..._equipment.htm
and if you don't mind reading the whole thing (which has additions that even include alt. fuel vehicles)...
http://www.epa.gov/otaq/regs/fuels/cff/memo-1a.txt

Edited for more proper epa link...

Last edited by Triaged; 08-31-2005 at 11:16 PM.
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Old 08-31-2005, 11:09 PM
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Also prevents part throttle detonation at cruise speeds.
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Old 09-01-2005, 12:09 AM
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[QUOTE=Jacks77]
Quote:
Originally Posted by Triaged
1) Because it does nothing to hurt power output
Okay

2) Because the computer will throw a code if you remove it
Well, my 77 don't have a computer

3) Because it is against federal law (and in many places state law as well) to remove it.
Wrong! Depends on which state and how old your car is. Mine is 28 years and exempt.

4) Because it will help reduce NOx emissions making the air we all have to breath a bit better.
Well then, that's gonna wipe out 3/4 of the hot rods on this board that don't run the EGR...

This thread was meant to help the original poster of the question thus information posted should be relevant for his vehicle first and foremost. The things said so far are all true and great advice. While some advice may not apply to your car Jacks its great that all of it has been posted.
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Old 09-01-2005, 01:08 AM
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Quote:
Originally Posted by Triaged
Your car needs to be 68 or older (66 if it is a CA car) to be exempt. http://www.shadetreemechanic.com/smo..._equipment.htm
and if you don't mind reading the whole thing (which has additions that even include alt. fuel vehicles)...
http://www.epa.gov/otaq/regs/fuels/cff/memo-1a.txt

Edited for more proper epa link...
Not true!!
In CA your car is exempt if it is a 75 or older.....
Just checked into this again as I was going to help my nephew with a 76 mustang II Pro street...

OK, I typed to fast...
That is true but, you do not have to smog the car if it's a 75 or older..
So why would you worry about any of the requirement for that year car??
If you want to keep all that early smog crap on your car go ahead I will toss mine as it will never see a smog shop again!

Last edited by h8louzn; 09-01-2005 at 01:15 AM.
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