pyro temps
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Elder User
Joined: Feb 2003
Posts: 673
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From: Virginia
pyro temps
Well, i finaly did it today. I changed my pyro probe from post turbo to pre turbo. I am amazed at how much quicker of a response it has. Itll climb prety quickly.
tymar intake, 4" straight exhaust diablo 60 HP tune (older 60 hp, the better one i hear)
Is 1250 or so the max i should ever see? What should i see cursing down the highway? Havent wound it up on the highway yet.
tymar intake, 4" straight exhaust diablo 60 HP tune (older 60 hp, the better one i hear)
Is 1250 or so the max i should ever see? What should i see cursing down the highway? Havent wound it up on the highway yet.
Senior User
Joined: Mar 2004
Posts: 336
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From: whitney
well it depends on the conditions: speed, outside temp, loaded not loaded, hill's no
hill's. It should run about 700,-750,800, thats going 70 without a load, on level ground
& w/out a power enhancement chip or module. I don't know what you would see with
your programmer. Mine runs a little hotter than it did now that summer's finaly setting
in. I pulled a 16' flatbed trailer with a 400 lb 4wheeler on it and ramps and a i-beam
propane torch rack. It never showed much over 950, but that was in the heat of the day, runnin up and down hills, going 60-65 sometimes 70, when it would. Oh and
I wouldn't exceed 1250, you can for a very short while, but by all means don't if you don't have to. 950 was the highest, I didnt mean it ran that at highway speeds, just
accelerating.
hill's. It should run about 700,-750,800, thats going 70 without a load, on level ground
& w/out a power enhancement chip or module. I don't know what you would see with
your programmer. Mine runs a little hotter than it did now that summer's finaly setting
in. I pulled a 16' flatbed trailer with a 400 lb 4wheeler on it and ramps and a i-beam
propane torch rack. It never showed much over 950, but that was in the heat of the day, runnin up and down hills, going 60-65 sometimes 70, when it would. Oh and
I wouldn't exceed 1250, you can for a very short while, but by all means don't if you don't have to. 950 was the highest, I didnt mean it ran that at highway speeds, just
accelerating.
Senior User
Joined: Apr 2002
Posts: 211
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From: Reno USA
I tow 13,000 lbs fairly regularly and I also have it tuned with the scmt at the 60 hp setting, flow through muffler and cold air intake. Pyro pre turbo. I see my temps running around 600-1200 degrees in most cases with the occaisional 1250 when going up some steep hill/mountains. I don't let it get much beyond that for any lenght of time. Once in a while I see 1250-1275 but just for a matter of two or three seconds.
Senior User
Joined: Nov 2001
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I guess theoretically, pre is better because it lets you know if your in the danger zone of burning a piston or valve or maybe a turbo. Post says "sorry, you lose." There is a significant lapse in time of reaction pre-post. Also, it has been widely reported that the temps vary as much as 350*. It would be kinda cool to have pre and post just to know but who would watch the road?
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
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From: Cabot, Arkansas
Originally Posted by gunfrk
It would be kinda cool to have pre and post just to know but who would watch the road?
Postmaster
Joined: Feb 2002
Posts: 2,773
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From: Bonney Lake, WA
The needle on a pre-turbo mounted pyro climbs considerably faster. Under certain circumstances, the lag time in the post-turbo mounted pyro can be enough that you wouldn't know about the potential damage to your turbo and intake valves until it's too late to back out in time.
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Senior User
Joined: Feb 2003
Posts: 333
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From: Idaho
I have a question for you guys....my pre turbo pyro runs really high (around 1100 with some slight variance) when I am towing my 6000lb trailer on flat ground. Temps here in Boise have been between 85-90 when I have been towing and I have a stock intake with the tow-safe tune from the predator loaded. Is this normal and could I expect an after market intake like the Tymar product to reduce my temp by approximately 100 degrees? I realize that style of driving has a lot to do with what we see on our gauges but I consider myself a conservative driver (in a attempt to extend the life of my motor).
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Senior User
Joined: Mar 2004
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From: whitney
yeah I think all of which you just stated will happen if 1250 is met. I believe the
turbo compressor wheel starts to glow, then with it being red hot and turning
145,000 rpm's between the two factors it will straighten the veins out straight.
turbo compressor wheel starts to glow, then with it being red hot and turning
145,000 rpm's between the two factors it will straighten the veins out straight.
Posting Guru
Joined: Feb 2004
Posts: 2,248
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From: Elverson, PA
From what I understand - it's not necessarily the turbo you are protecting with the EGT's - but the motor. If the pistons get too hot they will get tiny miniscule crackes in them and eventually grenade if repeatedly abused. That's why guys say you won't hurt stuff if you romp it over 1250 for a short time - 'cause it takes time for the pistons to build up the heat where as EGT's change very quickly. I'm sure you are protecting the turbo at the same time - but it's the whole motor that you're saving by keeping the temps down. That's why everyone around here stresses gauges FIRST - before any other mods!!!
Senior User
Joined: Mar 2004
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From: whitney
yea, I didnt just mean at that temp only the turbo would be harmed. And yes
the motor will be be at a potential hazard. While we're on this subject how much
does a aftermarket downpipe or aftermarket muffler or a straight pipe lower
the egt's?
the motor will be be at a potential hazard. While we're on this subject how much
does a aftermarket downpipe or aftermarket muffler or a straight pipe lower
the egt's?
Fleet Mechanic
Joined: Feb 2004
Posts: 1,816
Likes: 3
From: River Valley AR
Watch any high dollar motor on a dyno and they will have a provision to monitor exhaust gas temp. They do this with or without a turbo because it is used as a reading to tell what's going on in the combustion chambers, and how each cylinder is running. Protecting the turbo from high EGT is not the point. Knowing when your pistons are getting hot enough to see through is the point.