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Old 12-01-2001, 08:29 AM   #1
tonytiger
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Question Removing EGR-system for power.Questions

Many have probaply thought that recycling exhaust gasses back to intake can't be a good thing. Well that is what the egr-system does. So I'm planning to remove it or stuck the hoses with a plug or something to dissable this.
Question 1:
How does it effect on my car's other electric systems (Legacy 1993 EJ18 sohc)? What does the ECM like about it?

Question 2:
How large amount of the exhaust gas are at maximum percent recycled? What about the minimum (probaply zero)?

Question 3:
How does this affect on gas consumption?

Question 4:
Has anybody done this? Experiments, please?

Question 5:
How did you do malfuntioned the system?


Thanks for all comments and knowledge.

Maybe forgot something...



tony
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Old 12-01-2001, 08:46 PM   #2
munkis
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uhh leave it alone.

the egr system, improves performance and gas mileage.

Jay McDade
Auto Tech--Lincoln/Mercury/Jaguar
Dec. 7th subaru here I come
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Old 12-01-2001, 11:00 PM   #3
Richard L.
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EGR only improves part throttle performance and gas mileage. At part throttle, the EGR system reroutes a small amount of the exhaust gas back into the intake. Since exhaust gas has already been burned, it doesn't burn again when mixed with the air/fuel mixture. Instead, it merely displaces some of the air molecules in the combustion chamber. As a result, combustion chamber temperature and fuel requirement are both reduced. Since a cooler combustion chamber decreases the chance of detonation, the ECU doesn't need to pull out timing. Therefore, you would get good performance and gas mileage.

There is no EGR at idle. Your idle will be rough if your EGR system feeds exhaust gas back into the intake at idle. Likewise, there is no EGR at wide open throttle. At wide open throttle, you want the maximum number of air molecules entering the combustion chamber in order to make maximum power.

In short, there is no need to disable the EGR system for power because it's not on at WOT anyway.

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Old 12-02-2001, 12:19 PM   #4
Blindeye_03
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my friend has a 97 supra tt & he disconnected his egr...makes the engine cooler he says. Alot of toyota guys do it....I have been told that our phase II engines dont have EGR at all b/c they already meet emmissions...sounds like a load of $hit, but I wouldnt want to mess with my emmissions stuff honestly .

-justin
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Old 12-02-2001, 02:29 PM   #5
wac
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Quote:
I have been told that our phase II engines dont have EGR at all b/c they already meet emmissions...sounds like a load of $hit, but I wouldnt want to mess with my emmissions stuff honestly
You have been told wrong. All the EJ25 engines I've seen have EGR. Only some EJ22's don't have EGR, mine included.

If you decide to remove the EGR components, there are a few ports that will need to be plugged, and you will get a number of OBD-II codes from the ECU, and maybe even a few engine misfire codes as well. Like the others have said, leave the stuff alone. You may want to leave it off if you're building a race car just so there are fewer things to put back when you rebuild the motor, but that's probably it.

-WaC
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Old 12-02-2001, 10:40 PM   #6
Richard L.
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According to SubyTechMaster, the '01 RS and the '02 WRX do not have EGR. Check out this thread for more details. I certainly do not see an EGR valve inside my '00 2.5RS engine bay.

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Old 12-02-2001, 10:50 PM   #7
2.5GT
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Default Wasn't able to find an egr either.

I couldn't find an egr on my 2001 legacy motor either.

Jason
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Old 12-02-2001, 10:57 PM   #8
yamarocket630
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Quote:
Originally posted by Blindeye_03
my friend has a 97 supra tt & he disconnected his egr...makes the engine cooler he says.


Actually, EGR lowers combustion temps, and therefore eliminating it would make the engine run hotter .
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Old 12-03-2001, 12:16 AM   #9
Blindeye_03
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Quote:
Originally posted by yamarocket630




Actually, EGR lowers combustion temps, and therefore eliminating it would make the engine run hotter .

you may want to check out supraforums.com to get more info...

-justin
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Old 12-03-2001, 01:33 AM   #10
Richard L.
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There are tons of materials on the web about EGR. Just do a search for "Exhaust Gas Recirculation".
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Old 12-03-2001, 05:17 AM   #11
HndaTch627
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Actually as far as i know 99+ EJ25 DO NOT HAVE EGR valves....why you ask....3 way catalysts...EGR Valves assit in reducing the production of NOX....these engines don't run excessively hot...and plus you can copensate that but running a 3 way cat which destroys NOX.

jeremy

My 2001 SURE AS hell doesnot have one
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