VNT turbo and EGT probe - Defender Source
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  #1  
Old December 14th, 2015, 10:16 AM
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John
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VNT turbo and EGT probe

I have one of the VNT turbos from the 2.8 International engine (from Michele's group buy) on my 300tdi and am soon going to add a full width intercooler. I want to put an EGT gauge on the dash but with the VNT turbo and different manifold there is no handy EGR blanking plate to put the probe. For those with VNT turbos, has anyone fitted an EGT probe and where did you put it?

Cheers,
John
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  #2  
Old December 14th, 2015, 10:37 AM
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Ash Heller
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These are the same as what comes on the 2.8, right? It's a contoured surface so you need to mill it flat and then drill your hole, but there's plenty of room. Here's a picture of one I did.

-Ash

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  #3  
Old December 14th, 2015, 12:05 PM
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That's exactly what I did, too. Had a machine shop make a flat spot for the probe and then drill the proper sized hole there. Then had the whole thing ceramic-coated--unnecessary but it looked nice.
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  #4  
Old May 20th, 2016, 02:41 PM
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Quote:
Originally Posted by Ash View Post
These are the same as what comes on the 2.8, right? It's a contoured surface so you need to mill it flat and then drill your hole, but there's plenty of room. Here's a picture of one I did.

-Ash


Sorry for the dumb question, but does this require the removal of the manifold? If I'm going to take this to a machine shop, what do I need to remove and how much should I expect to pay for the milling n drilling? I have the 2.8 TGV.

Thanks!
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Old May 20th, 2016, 03:36 PM
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mark kellgren
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I didn't mill mine. but I drilled it while it was off. you can drill and tap as well with it on but you have to be carefull that the shavings don't fall in the hole. A common practice (so I I've heard by several sources) to prevent that is to put grease on the spot you are going to drill, then let the engine idle while you drill and tap, so the exhaust gases blow any shavings out under light pressure.
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Old May 20th, 2016, 04:30 PM
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Originally Posted by Overlander View Post
I didn't mill mine. but I drilled it while it was off. you can drill and tap as well with it on but you have to be carefull that the shavings don't fall in the hole. A common practice (so I I've heard by several sources) to prevent that is to put grease on the spot you are going to drill, then let the engine idle while you drill and tap, so the exhaust gases blow any shavings out under light pressure.
Good to know. Any chance you have a pic of where you drilled yours? I'm a little nervous about the whole process and haven't had the best luck
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Old May 20th, 2016, 05:03 PM
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Originally Posted by Matt_110 View Post

Good to know. Any chance you have a pic of where you drilled yours? I'm a little nervous about the whole process and haven't had the best luck
Ive posted the pic before. dont have it handy. you can search for it.
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Old May 21st, 2016, 01:51 AM
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Just today I was looking at installing a probe in my VNT (2.8 type) manifold. But the probe supplied by MadMan is the straight type. Due to the M&D intake pipe over the turbo it looks like a 90 deg probe would work better.
Some have bent the probes in a brake pipe bender. Supposedly the insulating fill does not short out if the radius is reasonable. Only Edge says it cannot be done. Any thoughts on this?
Or just go to HGSI (The Sensor Connection) for a new probe, with the attendant down time.?
Regards, Eric.
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  #9  
Old May 21st, 2016, 10:11 AM
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Brian
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I don't have the madman probe so don't know if it the same but I bent my McNally probe to install in my 300 tdi VNT turbo I installed and have had no issues with readings.
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Old May 23rd, 2016, 10:15 AM
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Bill
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Quote:
Originally Posted by Whiesel View Post
Just today I was looking at installing a probe in my VNT (2.8 type) manifold. But the probe supplied by MadMan is the straight type. Due to the M&D intake pipe over the turbo it looks like a 90 deg probe would work better.
Some have bent the probes in a brake pipe bender. Supposedly the insulating fill does not short out if the radius is reasonable. Only Edge says it cannot be done. Any thoughts on this?
Or just go to HGSI (The Sensor Connection) for a new probe, with the attendant down time.?
Regards, Eric.
I don't have a VNT Turbo, but I do have a madman probe in my stock EGT blanking plate, and the madman instructions tell you to stick a box-end wrench on the end of the probe and bend it until its nose clears the manifold and allows the blanking plate to sit flush.

I bent mine probably more than was necessary--looks a lot like a banana--and have had no issues. All that to say you can bend them a pretty good bit and still have them work just fine.
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  #11  
Old May 23rd, 2016, 11:11 AM
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I installed a VDO probe in mine, no issues.
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  #12  
Old May 24th, 2016, 12:36 AM
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Eric Williamson
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Thanks for the advice. Bent the probe 90 degrees and tested it. All's well.


First pic shows the probe installed. The probe points toward the front of the engine and the lead is routed around the engine back to the firewall with enough lead to reach the gauge. Saves having to coil up the excess lead as well. I did this at I have a bracket to the rear of the probe that supports the intake.


A while back, the clip that M&D supplies to support the intake pipe fractured (due to vibration) so I knocked up the "T" bracket you can see to the right of the probe. Its slotted at the back of the ears to retain a couple of hose clips.


Second pic. Anyone with a similar problem might consider this fix. Been good for over a year now, and a plus is that it holds the intake elbow away from the terminal on the alternator.

Eric.
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