NEW D-MAX /MUX /COLORADO FORUM

NEW D-MAX /MUX /COLORADO FORUM
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 Post subject: Pyrometer position
PostPosted: Sat Jan 14, 2017 6:45 am 
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Joined: Sat Jan 14, 2017 6:26 am
Posts: 2
Hi all, I have a 2012 manual D-max (old model) and just done a remap of the ECU with good results and want to fit a Pyrometer to monitor EGT. Just wondering, what is the best position to drill and tap for the probe to get accurate temps that matter.
thanks


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 Post subject: Re: Pyrometer position
PostPosted: Sat Jan 14, 2017 10:08 am 
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Joined: Sat Oct 12, 2013 5:36 pm
Posts: 1403
Two ways to fit a pyrometer probe. Before or after the turbo, your choice.

One involves drilling the exhaust manifold before the turbo and tapping a thread in it. That should give ACTUAL exhaust temp readings.
Because there is a pressure drop across any turbo and energy is lost you can also fit it after the turbo BUT EGT values will be lower, lower up to 200 degrees (I am told).
If OE exhaust then you have to weld a threaded ferrule to the pipe/Dump pipe, so the probe can be held in the collet of the fitting you screw into the ferrule you welded on.
If after market dump pipe is fitted it may have a port already there, some do some don't.

My EGT post Turbo is around 320/360C for most situations out on the road. Max I have seen post turbo is 420C under full load towing and at around 130kmh actual. Silly yes but I had to try it. That was in the NT though.

PS, pre turbo is ok but if the probe tip ever fails, then goodbye turbo compressor. That may be a decider for you.


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 Post subject: Re: Pyrometer position
PostPosted: Mon Jan 16, 2017 6:23 pm 
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Joined: Sat Jan 14, 2017 6:26 am
Posts: 2
Thanks, probably go after Turbo, don't want to pull off the Turbo to clean out drill & Tap filings.


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