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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 01-14-2013, 01:16 AM   #14981
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Lol EGR valves only apply to diesels.
False. It's common in all internal combustion engines. Open the hood of any 90s/early 2000s Camry or Corolla and you'll see it. Our engines handle this internally and don't require a separate valve. The whole idea is emissions control
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Old 01-14-2013, 01:21 AM   #14982
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you guys do not understand that our cars do NOT have that thing in the headlight that spreads the light evenly. so basically you will have some bright lights blinding the living fcuk out of them.
That thing is called a projector FYI. And what do u care no one was throwing u a bone

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Old 01-14-2013, 01:33 AM   #14983
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False. It's common in all internal combustion engines. Open the hood of any 90s/early 2000s Camry or Corolla and you'll see it. Our engines handle this internally and don't require a separate valve. The whole idea is emissions control
I was referring to the E46. EGR is achieved by valve overlap in non diesel E46s.
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Old 01-14-2013, 06:56 AM   #14984
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Replaced control arm bushings, diff. fluid, tranny fluid, coolant flush, new water pump, new belts, picked up a mint sport wheel to replace the worn one that came with it, touched up the rims as best I could (balanced as well) and cleaned the CCV. Runs great (and looks pretty good) sitting in the garage .

A few months of winter left to keep cleaning up the interior. Seems to have been neglected over the first 10 years of its life.
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Old 01-14-2013, 11:14 AM   #14985
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Old 01-14-2013, 12:20 PM   #14986
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Tires. VCG. Some random o ring in the cooling somewhere. Oil filter. Oil.

All in preparation for 2,200 miles in 6 days.

God damn it.
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Old 01-14-2013, 12:21 PM   #14987
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Tires. VCG. Some random o ring in the cooling somewhere. Oil filter. Oil.

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Old 01-14-2013, 01:03 PM   #14988
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I was referring to the E46. EGR is achieved by valve overlap in non diesel E46s.
Theoretically, does EGR reduce power since part of the mixture are theoretically inert combustion byproducts? Do you think tweaking the VANOS tables so that EGR doesn't happen would improve hp at all?

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Old 01-14-2013, 01:07 PM   #14989
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Changed a tire, plasti-dip grill, added water to battery since it wouldn't start in the cold, had a Canadian laugh at me since I said it was cold. Yes 34 degrees is cold in Phoenix. all before 9am and class.

Alpine white looks so much better with blacked out grills IMO, updates the car to a more modern look not to mention the only other chrome part I have is door handles. Definitely recommend to anyone looking to do plasti-dip, much cheaper than 50.00 grills from Khoalty, or ecs, or mod.

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Old 01-14-2013, 01:38 PM   #14990
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Old 01-14-2013, 02:05 PM   #14991
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Theoretically, does EGR reduce power since part of the mixture are theoretically inert combustion byproducts? Do you think tweaking the VANOS tables so that EGR doesn't happen would improve hp at all?
I think that it now actually has benefits (other than just emissions). Apparently EGR reduces temperatures in the combustion chamber. That is it's primary function as NOx forms at higher temperatures. This improves thermal efficiency by reducing heat loss through the walls. It also means the engine's components experience less wear.

One thing to note is that most engines don't EGR during high loads/RPM because it DOES actually hurt peak performance. So, when you floor it on our cars, I imagine that the valve overlap is significantly reduced. It makes sense to EGR in partial throttle situations as this would reduce the emissions the maximum amount and not affect driveability.

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Old 01-14-2013, 02:57 PM   #14992
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I think that it now actually has benefits (other than just emissions). Apparently EGR reduces temperatures in the combustion chamber. That is it's primary function as NOx forms at higher temperatures. This improves thermal efficiency by reducing heat loss through the walls. It also means the engine's components experience less wear.
EGRs main purpose is to increase efficiency. During valve overlap, some of the exhaust gases are recirculated back into the cylinder at the same time as the new fuel/air mixture is injected. These exhaust gases comprise of mostly non-combustible gas, such as CO2. Since these exhaust gases take the place of some of the fuel/air mixture, less fuel is needed and the engine can run leaner without the risk of misfire.

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One thing to note is that most engines don't EGR during high loads/RPM because it DOES actually hurt peak performance. So, when you floor it on our cars, I imagine that the valve overlap is significantly reduced. It makes sense to EGR in partial throttle situations as this would reduce the emissions the maximum amount and not affect driveability.
At high rpm, maximum valve overlap is needed to fill the cylinders with as much fuel/air mix as possible. There is minimal EGR at higher rpm due to the inertia of the intake and exhaust gases. This is also where well designed headers come into play as they can help scavenge the exhaust gases out of the combustion chamber.
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Old 01-14-2013, 03:13 PM   #14993
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EGRs main purpose is to increase efficiency. During valve overlap, some of the exhaust gases are recirculated back into the cylinder at the same time as the new fuel/air mixture is injected. These exhaust gases comprise of mostly non-combustible gas, such as CO2. Since these exhaust gases take the place of some of the fuel/air mixture, less fuel is needed and the engine can run leaner without the risk of misfire.



The higher the rpm the more valve overlap the engine needs. There is minimal EGR at higher rpm due to the inertia of the intake and exhaust gases. This is also where well designed headers come into play as they can help scavenge the exhaust gases out of the combustion chamber.
1. This would allow the throttle body to be open wider for any given throttle position without requiring the extra fuel. That increases volumetric efficiency. Very smart.

2. So the lack of EGR at high RPM for us is really just a lack of ability to accomplish that function using valve overlap?
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Old 01-14-2013, 03:39 PM   #14994
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Just took my Sally-Sue round-trip from Columbia, MD to Sumter, SC and back... 963 miles R/T; just about to cross 341,000 miles; man I love this bimmer!
I hope you threw a Molotov at that city (Scumter) and never looked back..
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Old 01-14-2013, 03:39 PM   #14995
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Changed spark plugs, very easy took all of about 45 mins start to finish. And by the looks of the old ones glad I changed them.
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Old 01-14-2013, 03:58 PM   #14996
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That's what mine looked like. My new Bosch plugs had a TINY electrode. I guess that's normal, they run great. Those are NGK replacements?
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Old 01-14-2013, 04:05 PM   #14997
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Yep ngk's bma had them really cheap got them all for $36
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Old 01-14-2013, 04:40 PM   #14998
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2. So the lack of EGR at high RPM for us is really just a lack of ability to accomplish that function using valve overlap?
Yes. It's really a case of best of both worlds. You wouldn't want residual exhaust gases in the combustion chamber if you're trying to extract maximum power out of the engine.
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Old 01-14-2013, 05:07 PM   #14999
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Adjusted the allen head on my driver's side door to try and make the door open easier. Now the door won't open from the outside.
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Old 01-14-2013, 05:28 PM   #15000
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