D22 Navara EGT probe location

Submitted: Saturday, Jun 07, 2008 at 16:40
ThreadID: 58480 Views:8466 Replies:4 FollowUps:3
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Has anyone fitted an EGT gauge to a D22 Navara ZD30 & if they have were did they put the thermocouple? I was looking at drilling & taping the housing just after the turbo but I'm not sure if there is anything in there. I think going into the exhaust pipe might be to far away & I didn't want to pull off the exhaust manifold just to fit the probe. Any ideas would help.

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Reply By: Member - Vince B (NSW) - Saturday, Jun 07, 2008 at 18:07

Saturday, Jun 07, 2008 at 18:07
I had an EGT fitted to my DID pajero last week. Had it fitted below the turbo.
Works well.
AnswerID: 308386

Reply By: Ross H (QLD) - Saturday, Jun 07, 2008 at 20:51

Saturday, Jun 07, 2008 at 20:51
Hi matty
I fitted one about two weeks ago and put it in exhaust before turbo as you get more accurate reading.
I used the one supplied buy a site sponser Ian From Thermoguard Instuments. If you go to his website he has some interesting reading about fitting and how it works.
Regards Ross
AnswerID: 308420

Reply By: Member - Bucky (VIC) - Sunday, Jun 08, 2008 at 08:20

Sunday, Jun 08, 2008 at 08:20

Ian, from thermoguard recommends that the thermocouple be placed before the turbo, to give the most accurate readings. Apparently it gives the most accurate reading of what is happening inside the motor.


AnswerID: 308468

Follow Up By: Member - John F (NSW) - Sunday, Jun 08, 2008 at 15:50

Sunday, Jun 08, 2008 at 15:50
I got excited about fitting one of these, because of the obvious benefits, but had a close look and baulked at the amount of work required in stripping away the turbo if fitting upstream, or finding enough meat downstream to tap the 1/8 BSP thread required.
Decided that light footed, sensible driving of the standard Hilux would suffice.
I would be very nervous about an upstream fitment by a mechanic I didn't know (or an ambitious DIYer) due to risk of subsequent exploding turbo from to a little bit of swarf left behind...

Regards, John
FollowupID: 574524

Follow Up By: Ross H (QLD) - Sunday, Jun 08, 2008 at 22:05

Sunday, Jun 08, 2008 at 22:05

You can safely drill the hole with out taking your turbo off.
The manifold is cast not mild steel , when you drill and tap make sure you have plenty of the thick grease like cutting compound on the drill and tap and clean often. When you drill cast you don't get alot of swarf like mild steel you mostly get a fine powder which sticks to the cutting compound. Just drill slowly and clean drill and tap often.
Chances are what does get through will blow out when you start car. At temp of between 300 and 650 deg C it won't stay there for long.

Regards Ross
FollowupID: 574645

Follow Up By: Member - John F (NSW) - Monday, Jun 09, 2008 at 10:24

Monday, Jun 09, 2008 at 10:24

Agree - "chances are" what does get through will blow out when you start, but remember it has to "blow out" past a very finely balanced and toleranced device that can spin at 100000 rpm. As far as I know the turbo is designed to cope with combustion by products, not particles of metal, no matter how powder like. Don't think you can be sure of no little lumps of caste iron as the drill breaks through...
I expressed my reservations to Ian from Thermoguard, via email, and he very kindly took the time to respond to my query and stated that he had not envisaged anyone doing an upstream install without first disconnecting from the turbo.
Would be interested to get any data on rates of premature turbo failure from those with upstream EGTs, downstream EGTs and no EGT..., especially if it was known for sure whether the install was done properly - (ie. disconnected from turbo) - in the case of upstream installs.
Good luck, but would not do mine that way.

Regards, John.
FollowupID: 574739

Reply By: Thermoguard Instruments - Friday, Jun 27, 2008 at 13:50

Friday, Jun 27, 2008 at 13:50
Hi Matty,

Haven't been on the forum for a while so I've only just noticed your post. If you're not happy about the dismantling required to do a pre-turbo installation and you don't already have a threaded port near the turbo outlet as many aftermarket systems do, the next best idea is a socket welded onto the exhaust pipe close to the turbo outlet flange.

Access varies from model to model but on many vehicles, an exhaust specialist would be able to weld a steel 1/4" BSP female onto the pipe in situ. You can then drill through the pipe wall through the socket and insert the EGT sensor.

If you're interested, please conact me direct and I'll see if I can dig out some Navarra ZD30 photos.

AnswerID: 312531

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