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  #1  
Old 03-16-2009, 05:28 PM
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EGT'S/ probe

Why does (almost) everyone put the probe in the
exhaust manifold? Doesn't that just read one side?
I'm going to put gauges in this weekend. If it is put
in the top of the down pipe you will get a lower reading,
I get that but you might see a spike if something goes
wrong with both sides. I see both ways. What is correct.
And why?
THANKS...
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Old 03-16-2009, 05:31 PM
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The temps between the two manifolds might differ a negligible amount (maybe 50 degrees). If something major is happening, there are other indicators that will let you know what is going on. If you're really concerned, install two EGT probes/gauges.
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Old 03-16-2009, 05:40 PM
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I figured it would take 2 of each, so what would the temp
differance be putting it in the down pipe?
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Old 03-16-2009, 05:45 PM
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Quote:
Originally Posted by 5th wheel View Post
I figured it would take 2 of each, so what would the temp
differance be putting it in the down pipe?

It can be nothing or as much as 500... There is NO use for a post turbo pyro. If you want to install it there, just leave it out because it will do nothing for you.

I have one on each side, no differance under 99% of driving conditions.

Install it in the drivers side manifold and use 1250 as your red line.

Here is a piston out of my early 99 from using a post turbo pyro and a 1100 egt red line...

Last edited by CSIPSD; 08-16-2013 at 03:48 AM.
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Old 03-16-2009, 05:48 PM
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Thanks, that helps alot.
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Old 03-16-2009, 05:50 PM
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So post turbo is worthless? What is the temp difference do you think from manifold temp to post turbo temp?
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Old 03-16-2009, 05:54 PM
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Quote:
Originally Posted by Big Blue Stroker View Post
So post turbo is worthless? What is the temp difference do you think from manifold temp to post turbo temp?


Like I said, it can be as little as nothing or as much as 500... Depending on the load, RPM's, Tuning, Tire size and gearing... just too much to guess on.

Pre turbo if you want to run it... if not, dont waste the time!
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Old 03-16-2009, 06:00 PM
JJR JJR is offline
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I just moved mine from the downpipe to the manifold this past weekend. I can say on a long hard pull I am not seeing much differance in temps but in shorter burst the readings are more more responsive in the manifold and are about 200 degrees hotter. Bottom line is this, if something isn't right you will know sooner with it in the manifold. It seems like the readings will catch up with it in the downpipe but the earlier the warning the better in my opinion. I recomend now putting it in the manifold, max temp 1250 degrees. If in the downpipe, max temp 1050 degrees to be safe.
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Old 03-17-2009, 03:07 PM
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I understand what everyone is saying.
THANK- YOU for the HELP.
One last question, why do semis
have it after the turbo?
Maybe because they are so low tuned.
Thanks again, this did clear some air!!!!
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  #10  
Old 03-17-2009, 03:17 PM
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Quote:
Originally Posted by 5th wheel View Post
I understand what everyone is saying.
THANK- YOU for the HELP.
One last question, why do semis
have it after the turbo?
Maybe because they are so low tuned.
Thanks again, this did clear some air!!!!
Its kind of a old school thing, the older probes could break off and then would eat a turbo... The newer probes in 10 years of messing with these trucks I have never heard of one breaking.

They are also a I-6 or I-8 motor, so there is somewhat less hea lost across the turbo.
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