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  #31  
Old 07-27-2005, 11:46 PM
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I want to do the same thing Old South did. Disabling the EGR.
Not sure I understood everything said here. Could anyone here explain more in details what Oldsouth did ? Thanks very much.

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  #32  
Old 07-27-2005, 11:53 PM
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Quote:
Originally Posted by Californian
I want to do the same thing Old South did. Disabling the EGR.
Not sure I understood everything said here. Could anyone here explain more in details what Oldsouth did ? Thanks very much.
He had the turbo rebuilt. He then had the rebuilders replace the stock vacuum controlled wastegate with a pressure (boost) controlled one. This way, the computer has no way to alter the performance of the engine when it does not like people messing with it's emission systems. At worst, he will have a check engine light.
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  #33  
Old 07-28-2005, 12:16 AM
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Location: Phoenix Arizona. Ex Durban R.S.A.
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Emissions in Texas

I'm curious as to how he goes thru emissions in Texas with that setup. Modifying the emission system in any way is illegal here in AZ and the car, because of it's age would have to be tested annually. Do they not do emissions tests in Texas? Maybe I need to relocate.

- Peter.
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  #34  
Old 07-28-2005, 12:23 AM
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I am in Louisiana and no we do not have emissions testing. One question, when they do an emissions test how long is the test and do they run the car on a roller or what. Actually with the egr disabled you get less soot and smoke than with it enabled. I think just the nox goes up.

And no, my car does not have a check engine light to light up.
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1998 E300D
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2012 E350 BlueTec
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  #35  
Old 07-28-2005, 12:52 AM
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In California, Smog check isn't required for Diesel cars.
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  #36  
Old 07-28-2005, 12:53 AM
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Oldsouth,

So you have people redone the tubo for you, correct ? How do you install this Dawes device ?
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  #37  
Old 07-28-2005, 01:27 AM
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Location: Phoenix Arizona. Ex Durban R.S.A.
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Emissions in AZ

Oldsouth. Lucky you are. Here in Phoenix diesels are required to be tested yearly. They run all cars that are tested at various speeds on treadmills for about a minute at a time. Diesels they apparently only test for particulate levels, but they also check for any tampering with the original emissions equipment. Thus disabling the EGR is not allowed. Also they test the pressurization of the fuel system (on gassers, not sure about diesels) which often results in you having to replace gas cap, reseal the tank, and replace the fuel lines. Found that out the hard way with an 82 Buick. Phoenix is the worst place in the country for emissions requirments. All cars from five years old back to 1967 are required to be tested before renewal tags will be issued.

- Peter.
__________________
2021 Chevrolet Spark
Formerly...
2000 GMC Sonoma
1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021
2002 Kia Rio. Worst crap on four wheels
1981 240D 4spd stick. 389000 miles.
1984 123 200
1979 116 280S
1972 Cadillac Sedan DeVille
1971 108 280S
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  #38  
Old 07-28-2005, 02:12 AM
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Running with WVO or Biodiesel

My goal for long term would be to run my car with WVO or biodiesel. So disabling EGR makes a lot of sense.
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  #39  
Old 07-28-2005, 09:17 AM
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It was kind of an accident the way it all came about. My turbo went out and I sent it to Garrett to have it fixed. They also replaced the wastegate control in the process and put a pressure operated one on instead of the vacuum operated (most wastegates are pressure operated). When I got it back and installed it, naturally it would not work right. I discovered what they had done and decided to try to go around the computer and hook it directly to the intake manifold. Worked great! I had previously disabled and then had to hook back up the EGR and knew that the computer would cut boost because it can tell the EGR has been disabled by the mass airflow meter at the air filter. Now there was nothing that could cut boost so I disabled the EGR again. You can replace the wastegate controller without removing the turbo. It is just tight.

The Dawes device is just an easy way to adjust boost pressure. You can do it by the wastegate controller but it is hard to get to and takes several runs to get it right. The Dawes device just goes inline between the turbo and the intake manifold. Simple. It also lets boost build strong up to the set point without any gradual bleedoff like the wastegate controller does. You just need to set the wastegate controller pretty much wide open. The Dawes device has instructions on this.

As far as emissions, if all they check is particulate; you could pass that with the EGR disabled. And you can disable it with a plate between the EGR and the manifold and they would never notice. Leave the vacuum hose on it.
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  #40  
Old 07-29-2005, 03:13 AM
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So the computer only has control of the turbo? Are there are no fuel controls on the injection pump for it to cut?
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  #41  
Old 07-29-2005, 09:08 AM
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Quote:
Originally Posted by 82-300td
So the computer only has control of the turbo? Are there are no fuel controls on the injection pump for it to cut?

None whatsoever.

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1952 220B Cabriolet
39K kilometers + SOLD
1998 E300D
310K +
2012 E350 BlueTec
120K
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