[Vwdiesel] Egt for 1.6td

[Andrew .Libby]

The response of your 'expert' tells me he doesn't know the factors
involved.  The 400 deg temp drop your 'expert' saw on some trucks was
undoubtedly because they were running higher boost and ex manifold
pressures not because of the exhaust length.  Engine size has nothing to do
with the temperature drop pre/post turbine.  As I've said a few times, the
temperature drop is based on the pressure drop across the turbine and the
turbine efficiency.  Although the factors like exhaust length, operating
temp, manifold size, etc..., will have some effect in as much as they
affect the pressure drop, but a shorter (or rather less restrictive)
exhaust post turbine will increase the temperature difference by decreasing
the pressure on the low pressure side as will a more restrictive manifold
or turbine housing for a given exhaust flow by increasing the pressure on
the high pressure side.




On Thu, Jan 23, 2014 at 8:47 AM, <dieseltdi at verizon.net> wrote:

> As I said in a earlier post, several years ago, I spoke with a local turbo
> specialist.  He has done work on all kind of diesels so I asked him about
> the placement of the EGT probe.  His response was that the exhaust pathway
> in our vehicles was so short, that it wouldn't make much difference where
> you put it.  He said that the total temperature drop would most likely be
> 200 degrees F or less.  Once a car is at opperating temperature, the hard
> parts tend to stabilize in temperature so that helps to keep temperature
> drops small.  Besides, we have low volume exhaust manifolds and  a
> relatively small turbo.  Short pathways, little temperature drop.  He told
> me that some of the diesel trucks have really long distances from the
> manifold to the turbo and out.  He saw temperature drops of 400 degrees in
> some of these.
>  Hayden
>
>
> On 01/23/14, GMac999 wrote:
>
> I know with several diesels that I've had, then temperature drop pre-turbo
> to post-turbo has been max of 250 F. I set my fueling at a max temp of 1150
> F under full boost, full load so that I don't have to monitor the exhaust
> temp all the time while pulling hills.
>
> GregM
>
> -----Original Message-----
> From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com] On
> Behalf Of lbaird119 at aol.com
> Sent: Thursday, January 23, 2014 12:19 AM
> To: libbybapa at gmail.com; teacher525 at hotmail.com
> Cc: vwdiesel at vwfans.com
> Subject: Re: [Vwdiesel] Egt for 1.6td
>
>
> Having seen the Isspro pre and post turbine gauges. I believe it was 150F
> difference in the temps. May have been 200 F but 150 sticks in my head.
> The same gauges, just different location of the green, yellow and red
> bands.
> Temp has to drop across the turbine since energy is being removed.
>
> I ran my Dasher at 1250F max boost. Only ran it there for 20 seconds or
> so, at a time. Otherwise I kept it to about 1150F. I've had that engine
> apart a couple times (still currently is with a cracked head bolt hole) and
> nothing bad has happened to it from heat.
> Loren
>
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