EGT where to fit the gauge

[JoshJ]

I installed the EGT gauge over the weekend. Thanx for everyones help my nurves was shot. with frequent prayer and loads of GRACE i installed it successfully

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[tour de frans]

Well done JoshJ
For what its worh, those probes can be bent if needed
Rdgs

[JoshJ]

Thanx Frans, apreciate it.

I installed the guages here for now. See there is alot of comotion on guage holders. So I'll wait and see what the guys come up with

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[Tony]

Hey Josh - or anyone else that has an EGT gauge fitted, can you please tell me whether your thermocouple is a K - Type, or J - Type, and what the colour of the wires are (where they come out of the shield).

Why, you ask - well, my EGT's are simply too high for my liking - as in 620 deg C cruising up the hill from Harties to Lanseria at 80 - 90 km/h with 4 people in the Patrol. She never was this bad before.

If I change the probe setting on the Madman from K-type to J-type, then she reads way lower and my stress levels are much better! SAC installed, and set the probe as a K-type and the wires are orange & white. All the research i've done on the net, as well as fron Madman and Temp. Controls in Strijdompark cannot link this colour code to either K or J type probes, so I am trying to find an easy way of checking what type of probe I have. Brian at Madman will sell me a new K-type for R 550.00 which I probably will get and replace mine with as a 1'st round of elimination to get to the bottom of my problem. RGM does'nt trust the Madman after all the hastles I have had in the past - so maybe this is the right first step to take.

Another question for all the fundi's out there - This higher reading I have only picked up after all the work was done on my engine including all the ceramic & teflon coating on the outlet manifold (where the probe sits - the probe was removed do apply the coating, and re-inserted) Could this have an impact on heat retension?? At the same time, we fitted a 3" downpipe which should have helped to expell that hot air quicker. (it has also been coated) Steve at RGM does'nt think the coating would affect the egt's at all.

I have adjusted the VNT screw to reduce my boost levels, and she is'nt smoking heavily (that I can see), so over boosting or overfueling should'nt be causing the high egt's which leaves me with this Madman / probe that could be at fault. What should the lifespan of the probe be? Could the pulling out and refitting have caused some damage maybe. I hate to think what the EGT's will climb to if I tow anything!!

[Bruin Beer]

Tony,
To me it sound as if the probe wire was extended If the colours don't match.
That in it self can also cause problems because if it is not extended using the same thermocouple wire you would be generating another couple at the point where the wires are joined and depending on the voltage measured at this alternative junction your reading would be off set by this value.
Regarding the ceramic it is not suppose to make a difference as long as the system is getting the correct ground/negative 12Volt reference at the correct places. If there is a problem with the installation and the grounding of the equipment where it actually relied on a ground path via the probe then the ceramic, which is a very good isolator, will throw the thing off completely.
My
Riaan

[Pieter B]

There is a company in City Deep that does VDO gauges. I believe that they are the official distributors. They also sell the K-type probe and might be a little cheaper than Brian. The wire should definently not be joined or even soldered. Check your earthing as that should be connected to the engine.

[Tony]

My unit was originally earthed to the body, and gave so many problems with the water temperature readings. However, since Brian located the bad earth, those are perfect and stable. My EGT probe certainly does not appear to have been joined anywhere as the white & orange wires come out of the original sleeving (I have not removed the entire cable to check, but it looks as though nothing has been tampered with) Can anyone verify what the correct colour code should in fact be??

[JoshJ]

Hi Tony,

My probe is a K type. The probe harness colours are red and yellow. The ems system wire coulers are white and orange. I bought everything from Brian. The yellow must connect with the orange and the white with the red. The probe harness has got some tipe of optic inforcing around it. This harness cable must under no sircumstances be bend sharply, cut or any of these things.

Maybe the harness was injured during all the work done. I would change the probe just to be sure. Or on another thought. Just loosen the probe and re-ajust it. Maybe its touching the manifold. Thus reading the iron temp and not the air.

After installing my egt i took the car for a test run. At one point i pushed as hard as i could just to see how high i can get the temp. At 160km/h pedal to the metal i only got up to 615degrees celcius. On normal everyday driving i get between 350 - 450 degrees.

Hope it helps

[Tony]

Thanks Josh - how must the probe harness wires be joined to the ems wires? Do they need to be soldered, joined with a connector block or simply twisted together?
I must look better, if you say that the orange & white come from the ems - are they covered by a wire sleeve? On mine, it really looks like the probe harness i.e. the orange & white wires are encased in the wire sleeve which runs under the steering wheel and through to the enjine bay - it may be possible that the join was made and the sleeve pulled over so that I can only see orange & white coming out and these two wires go directly up to the display. Will need time to look properly.

[JoshJ]

Brian said I must not cut or clear the tips on the probe. They are very prone to damage. Use connecter blocks to join them. The colours is the actual isolation around the copper wire. You can cut and strip on the ems wires. Just not on the probe wires.

If the wires are connected the wrong way around, you wil get a negative reading. Thats all. The only thing that can give you incorrect reading is if the earth is not directly onto the engine block, the probe is pushed against the manifold or the probe is damaged. . Check your probe position.

How responsive is your readings. Rapidly or slowly. If It touches the steel of the manifold i would think it would be slugish to respond.