Thread: Pyrometer in a TD5 defender

Originally Posted by Equalizer

... On mine td5 I work to 650 post if it was in manifold I would work to maybe 900. ...

So 750 is now 900???

Originally Posted by Equalizer

So 750 just before turbo 650 just after what's the big deal

You're a patient man dougal!
Does the waste gate position have a direct effect on the egt differential pre- and post- turbine?
Fun fact - Lycoming aircraft piston engines, turbo charged models, contain the egt probe right above the turbine inlet. That's with a single probe. Alternately a multi probe setup will contain a probe in the exhaust manifold just after the exhaust valve, one on each cylinder. This is the safest option as you can monitor each cylinder for excessively different temperatures.
Temperatures on turbo models redline at 1650F, 900C. Max continuous at 1550F, 850C. At those temperatures the manifolds glow bright orange. Looks cool at night

Its been at 650 max from brand new so best you work that out with landrover i've done 195000 a good chunk of that towing a camper and the 750 comparison was from when i asked what tombie was getting for his max temp but he was referring to his isuzu and i the td5 apologies if it confused the topic. Look its just a guide for you to drive or modify by long as you know what ur car does you can work with either

Originally Posted by Dougal

If you want to talk gospel, then you're spinning creationism.

650c post isn't a good thing.

And Thanks dougal you just proved the point i,m trying to make . You believe 650 post turbo isnt good. So you agree Its an indicator of egts post turbo. So same as in manifold if ur normal max temp is x then you notice it goes up from x then its done what its ment to. post turbo will always give its temps and pre turbo will give its temps both will be constitant in it temps to the load of the engine they are installed on one will be high one will be low. Surely this is a fair comment.

Originally Posted by Equalizer

And Thanks dougal you just proved the point i,m trying to make . You believe 650 post turbo isnt good. So you agree Its an indicator of egts post turbo. So same as in manifold if ur normal max temp is x then you notice it goes up from x then its done what its ment to. post turbo will always give its temps and pre turbo will give its temps both will be constitant in it temps to the load of the engine they are installed on one will be high one will be low. Surely this is a fair comment.

Nope.

This is like talking to a chain smoker.
*Cough, hack* I'm perfectly *splutter* healthy *hack* I'm going to *cough* keep smoking.

Your words bud "650 post turbo isnt a good thing" .In my td5 i,ve had the egt in for most of it 195000 ks itsmax temps have remand the same for the first half while standard when i had it remaped they went up when i put the intercooler in they went down good enough for me.

Originally Posted by Equalizer

Your words bud "650 post turbo isnt a good thing" .

Because it's not a good thing.

Originally Posted by Equalizer

In my td5 i,ve had the egt in for most of it 195000 ks itsmax temps have remand the same for the first half while standard when i had it remaped they went up when i put the intercooler in they went down good enough for me.

The harder the turbo works, the bigger the temp drop across it.
You may have had 650/750 stock, now you've probably got 650/850 or even 650/950 in some circumstances.

Originally Posted by Equalizer

[snip]
and pre turbo will give its temps both will be constitant in it temps to the load of the engine they are installed on one will be high one will be low. Surely this is a fair comment.

This is the issue though, it isn't consistent, ie. it's not a constant gradient or TD across the turbo under load, it varies.