Thread: TD5 EGT probe re-location

Mine is just pre turbo drilled into the "dimple or Pimple" that is located there.
My sensor has a right angle and just clears the heat shield. I think a sliced a bit off the heat shield for clearance.
Very responsive and goes over 700C on steep hills when towing and then it's time to back off.
Regards PhilipA

Either where Philip has his or in the egr blank plate Gavin, both spots read within 10 degrees of each other when I tested years ago.

If you go with drilling and tapping the dimple, then undo the oil feed to the turbo (cover both) and the 3 nuts holding the turbo to manifold, then pull back the turbo as far as the oil drain and exhaust flex will allow (tie it back to the shock tower) and cover the turbo side.

When you have drilled and tapped ( using a vacuum and magnet when drilling and grease on the tap) and screwed in the fitting for the probe, vacuum any remaining swarf from the manifold and refit turbo etc.

Glad you are hanging on to it for a while. I thought it had a remap as well?

Originally Posted by discorevy

Either where Philip has his or in the egr blank plate Gavin, both spots read within 10 degrees of each other when I tested years ago.

If you go with drilling and tapping the dimple, then undo the oil feed to the turbo (cover both) and the 3 nuts holding the turbo to manifold, then pull back the turbo as far as the oil drain and exhaust flex will allow (tie it back to the shock tower) and cover the turbo side.

When you have drilled and tapped ( using a vacuum and magnet when drilling and grease on the tap) and screwed in the fitting for the probe, vacuum any remaining swarf from the manifold and refit turbo etc.

Glad you are hanging on to it for a while. I thought it had a remap as well?

Thanks Craig did my D2a with the dimple location and looking to do the same with Bessie - and yes completely forgot about the remap - supposedly ~420 Nm Bruce Davis EMS Chip .

Still have oil in the diesel issue at the moment after the 3rd analysis, which was preceeded by Jakes almost rebuild and oil/filters changed.
So, still a work in progress. Cheers

Well, thanks for responses, but my limited query/explanation obviously didn't get my message (question) across so will try again.

Can anyone tell me what indicative difference there should be in EGT readings taken from a sensor in

(i) - the dimple on the exhaust manifold preturbo,

versus

(ii) post turbo (in my case in the exhaust pipe about 5 cm below the junction between exhaust pipe and turbo).

From my previous D2a I'm well aware of the readings from a sensor at the pre turbo dimple location, but don't have any knowledge of expected/dangerous readings in the post turbo scenario/s.

Normal flat road cruising sees 300 - 350 C, but on a long hill on the way back from Kalbarri to Fremantle yesterday, I saw 550 degrees C for the first time ever.

Not really relevant, but coolant temp never got above 86 with the new Allisport HD radiator.

Any useful responses out there?

A bit off topic but may help.

i monitor them on the LC,one in each bank,downstream of the turbos,near the DPF's.

Like yours,generally run 300 to 360 depending on ambient,and slight hills,on the hwy,on speed limt,100 or 110Km/hr.Slower speeds runs cooler,i have even seen double digets in cold weather going down a steep long hill.Going up steep hills may get to 400,or just over,for a short period of time.

Highest i have seen them was at 28 degrees ambient,in very soft sand on Fraser,520 degrees.Doing around 40 to 60 Km/hr for about an hour,it was working very hard.
Luckily i was monitoring auto temps as well,or it could have been cooked.

This is a guesstimate Gavin, as there are variables post turbo, but in the spot you mentioned, allow approx 100 degrees difference cruising and 150-200 degrees difference loaded up a hill, going from the time I bought a TD5 with the probe in a similar location ( it didn't stay there long ).

Looks like you will have to relocate the probe to know for sure, really should be pre turbo when possible to be consistently accurate anyway.

Modern factory fitted post turbo EGT's, fine for reference for ECU's