egr and gas mileage
#4
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Ive been told that removing the EGR on S4s will have basically no effect. When I rebuild I am using a S5 center housing, so I was concerned about emissions since my S4 has a EGR and the S5 do not. From what I gathered the EGR is basically useless and does nothing at all, and will not effect the car if removed.
#6
Do a barrel roll!
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Why do you say this?? Im seriously interested, as like I said, I am using a S5 center housing when I rebuild, so Id like to know what to expect. I know on any other car the EGR is an important part of the emissions sytem, but Ive been told by many people that on a S4 it was basically worthless, and did little if anything.
#7
I don't see how taking off your EGR could affect your gass mileage. Considering that all it does is recirculate small amounts of exhuast to be burned up even more. If anything taking off your EGR should improve gas mileage cause no more wasted gases being burnt up again, just pure fresh 02 and gas.
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#8
Alcohol Fueled!
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Originally posted by Rxmfn7
Why do you say this?? Im seriously interested, as like I said, I am using a S5 center housing when I rebuild, so Id like to know what to expect. I know on any other car the EGR is an important part of the emissions sytem, but Ive been told by many people that on a S4 it was basically worthless, and did little if anything.
Why do you say this?? Im seriously interested, as like I said, I am using a S5 center housing when I rebuild, so Id like to know what to expect. I know on any other car the EGR is an important part of the emissions sytem, but Ive been told by many people that on a S4 it was basically worthless, and did little if anything.
Jarrett
#9
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A broken or removed EGR valve shouldn't affect fuel consumption at all. It's only used as low loads (cruising), so the ECU will probably be in closed-loop mode to keep mixtures lean and economical.
I'm curious to know why the S4 needs an EGR valve to pass emissions, but the S5 doesn't. I know most of the S5 ECU's increased processing power went into emissions control and self-diagnostics, but I'm amazed it made that much difference.
I'm curious to know why the S4 needs an EGR valve to pass emissions, but the S5 doesn't. I know most of the S5 ECU's increased processing power went into emissions control and self-diagnostics, but I'm amazed it made that much difference.
#10
Alcohol Fueled!
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Originally posted by NZConvertible
A broken or removed EGR valve shouldn't affect fuel consumption at all. It's only used as low loads (cruising), so the ECU will probably be in closed-loop mode to keep mixtures lean and economical.
I'm curious to know why the S4 needs an EGR valve to pass emissions, but the S5 doesn't. I know most of the S5 ECU's increased processing power went into emissions control and self-diagnostics, but I'm amazed it made that much difference.
A broken or removed EGR valve shouldn't affect fuel consumption at all. It's only used as low loads (cruising), so the ECU will probably be in closed-loop mode to keep mixtures lean and economical.
I'm curious to know why the S4 needs an EGR valve to pass emissions, but the S5 doesn't. I know most of the S5 ECU's increased processing power went into emissions control and self-diagnostics, but I'm amazed it made that much difference.
#13
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Are you sure that's not where secondary air is pumped into the exhaust from the ACV?
You can't just pump ehaust into the intake all the time, as it seriously affects performance. That's why EGR valves are controlled by solenoids. The ECU only operates them at low load so that engine performance isn't noticable reduced.
You can't just pump ehaust into the intake all the time, as it seriously affects performance. That's why EGR valves are controlled by solenoids. The ECU only operates them at low load so that engine performance isn't noticable reduced.
Last edited by NZConvertible; 04-24-03 at 10:08 PM.
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