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'[OT] Oil and Diesel engines'
2005\07\22@134055 by Steve Murphy

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>I bought a copy of VAG-COM, and did the EGR mod.  If you haven't done
>so yet, do so.  It improved cold starts and mileage.  Essentially this
>is just changing a value in EEPROM.
>  
>
Google may be my friend, but it didn't explain what the EGR mod is and
*how* it improves cold starts and mileage. Would you care to explain?
Why on their website does VAG-COM say that the EGR mod is for "off-road
use only?" Does the mod increase emissions?

2005\07\22@174545 by Joe Farr

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Sorry for butting-in but this might help a bit.

I have a Toyota surf, 3.0L TD.
There is a known EGR (Exhaust Gas Recycling) modification that can be
made. For my vehicle, it involves pulling off a rubber hose and blocking
it at the now free end. No reprogramming or anything else.

Apparently, it allows exhaust back into the engine to be re-burnt, thus
reducing O2 emissions... The problem is that it affectively poisons the
engine, destroys the oil and in the Surf's case, can cause a hot spot on
the cylinder head making it prone to damage.

In some countries the vehicle would no longer pass the emissions test at
the annual MOT but here in the UK they don't test for such things.

I made the mod some time ago and fuel consumption is drastically down, I
get more power, less black smoke on a hard kick down and oil changes are
not required as often - you can tell the difference in the oil texture.
The service sheet says an oil change is required every 5000 km, and the
EGR is one of those reasons.

Joe


{Original Message removed}

2005\07\22@175223 by Dave VanHorn

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At 04:48 PM 7/22/2005, Joe Farr wrote:
>Sorry for butting-in but this might help a bit.
>
>I have a Toyota surf, 3.0L TD.
>There is a known EGR (Exhaust Gas Recycling) modification that can be
>made. For my vehicle, it involves pulling off a rubber hose and blocking
>it at the now free end. No reprogramming or anything else.

I had the same thing on my Toyota way back when, and saw the same
results. Between that, and a fairly aggressive adjustment to the idle
speed, I went from 12 to over 30 MPG. (measured)   That's also the
car where I finally proved to myself that the story about 30 MPH
being the "most efficient speed" was BS.  On that car, it was 62,
measured with multiple trials, with and against the wind.

2005\07\22@180846 by Alex Harford

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On 7/22/05, Steve Murphy <spam_OUTstephmurTakeThisOuTspamcableone.net> wrote:
>
> >I bought a copy of VAG-COM, and did the EGR mod.  If you haven't done
> >so yet, do so.  It improved cold starts and mileage.  Essentially this
> >is just changing a value in EEPROM.
> >
> >
> Google may be my friend, but it didn't explain what the EGR mod is and
> *how* it improves cold starts and mileage. Would you care to explain?
> Why on their website does VAG-COM say that the EGR mod is for "off-road
> use only?" Does the mod increase emissions?

Yes, disabling your EGR will increase your NOx by a lot!  For my car,
about 100x, but that was when I had an old catalytic convertor, so
maybe it's not as much with a good cat.

>From my experiences with my small block Chevy, running EGR improved my
mileage by about %10.  Probably because I could run more aggressive
timing.

Cold starts are a problem *only* if the EGR value is open when
starting, and it shouldn't be.  How is the EGR activated?  For my car,
it's from the vacuum in front of the butterflies, plus the solenoid
only lets vacuum when it's warmed up enough.  There shouldn't be any
EGR active at cranking or idle, but if your valve sticks open you'll
definitely have a hard time starting/idling.

I'm not too familiar with diesels though, so take this advice with a
grain of salt...

Alex

2005\07\23@232729 by Gerhard Fiedler

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Bob J wrote:

> Mine is a 5-speed, I have never gotten below 45mpg, in mixed
> city/highway driving.  Last fillup I got 47.3 mpg.  

That's about what my father got out of his (German) turbo diesel VW Passat
(the German equivalent of what was/is? sold in the US as "Quantum") in
1995. This technology has been around for a while.

Gerhard

2005\07\24@034103 by Marcel Birthelmer

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> (German) turbo diesel VW Passat (the German equivalent of what was/is? sold in the US as "Quantum")

The passat is sold as Passat in the states these days.

- Marcel

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