Thread: TD5 EGT Probe Installation

I've got a 2004 Extreme which has been Tombie re-mapped. Best thing I ever did!

However, I've been amazed at how easy it is to exceed what my research on this forum has led me to set as a maximum EGT. That is, 680 degrees celsius.

I now watch my EGT gauge like a hawk and back off as soon as I get close to 680 degrees. Any long uphill climb with an open throttle will do it, even if not heavily loaded. For example, the climb from the Mooney Mooney Creek bridge on the F3 going south.

My advice is to lay off the lead foot until you get your EGT gauge fitted. Otherwise you're going to do expensive damage.

As to fitting the EGT probe, I found a very good description on this forum and if I can recall where I found it I'll post again.

Since chipping Im reading HIGH coolant temps under full load,wich equates to what you are saying.
Andrew

[QUOTE=Rosco;1257357]OK

I've done my searching, but still I'm unsure about where is best to locate the probe. The consensus of opinion seems to be upstream of the turbo in the manifold. Strangy http://www.aulro.com/afvb/discovery-...nitor-but.html seems to have a tidy spot. Is this best?? Any other ideas/suggestions. Looks like I'd need to remove the turbo to get rid of any swarf from drilling and tapping.

have a look at this link it seems to agree with Strangys location.
I agree you would need to remove the turbo to drill & tap the hole.

Pyrometer | Pyrometers | Hewitt Industries | Huntington Beach, CA | Ph: 714-891-9300



Roger

The easiest and IMO the best place to fit the EGT probe is where the EGR system takes exhaust gasses for recirculation.

Contact The Entertainer (on this forum) as he provides EGR removal kits with the option of a drilled exhaust manifold plate to take an EGT probe.

Also, check out a post by Bush65 on fitting the probe. Low EGT temps?

It's very important that the EGT probe sits right in the middle of the hot gas stream. If it doesn't you will get false (low) readings.

FYI,
ive had the pyro in both locations, in the egr port at the front of the manifold and now in the center of the manifold as per pic above, my readings were identical between the two locations.

and i did a stock ecu map run with the d2 loaded with the trailer on and i couldnt for the life of me get the egt's above 750deg it was a struggle to get them there. also with the playing around ive found that if the egt's are kept high the coolant temps will go up but marginaly, im talking holding 750deg+ for over a minute you may see 102-107deg in coolant temps.
the heat soak from the high egt's wont make the coolant temps rocket up as fast as some think.

cheers phil

Have a read on thermoguard website.

They give a heap of very useful info as to what/where and why.
They supply EGT gauges also and have a Disco themselfes.

I bought mine from them and its all good.

OK

I've ordered the bits and decided upstream of the turbo seems to be the best location.

So ... for those who've been there and done that .........

Q1. Is there a gasket between the turbo and exhaust manifold that would need replacing when I take them apart??

Q2. Can I remove the turbo and leave the oil line connected. If not, is there an O ring or similar I would need to replace.

Q3. What's the consensus on upper temp limit that should not be exceeded? The figure of 750 deg C seems to crop up.

I want to have all the necessary bits to hand when I start the job.

Cheers

Originally Posted by discowhite

FYI,
ive had the pyro in both locations, in the egr port at the front of the manifold and now in the center of the manifold as per pic above, my readings were identical between the two locations.

I go along with discowhite on this. Both spots are going to give very similar if not the same readings. In any case, at the temperatures involved 5 or 10 degrees difference will not matter.

Q1. As the blanking plate is a much easier install that's the place I put it. When I fitted mine I used a gasket.

Q2. Doesn't apply if fitting in the EGR port.

Q3. I settled on 680 degrees Celsius after much scouring of this forum. Maybe a little conservative but much cheaper than destroying my engine.