Pyrometer Location

[05ComminsRail]

Hey guys I often see pictures of another persons truck and you can see their pyrometer probe in the top of the manifold forward of the outlet. According to the installation sheets that came with my gauges it should be in the rearward part of the outlet. Just curious if it will make a difference in the reading or what the theory is behind the different location.

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2005 2500 4x4 G56, Smarty, Quad boost fooler, 5in straight, CAI,DiPricol pyro/boost in the pillar, leveled with 305 nittos,B&W turnover,Ranch Hand,smoked Recons on roof, 5% on windows, PSC stabilizer,

[D45]

I have mine in the rear portion of the manifold, because the rear 3 cylinders will prouce the most heat....

I have heard that the front pyro position can result in a 200-300 difference in EGT temps.

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'04 Ram QC 3500 SRW LB 4WD; 305/555 HO CTD, LT315s, H2s, Fabtech 4.5", 2.25" Dirt Logics, MBRP 5" Straight Pipe Exhaust, AFE Bladerunner, IceBox Intake, Cool Hose....SMARTY JR

[Fern]

Yup, mines in the rear portion of the exhaust. I've heard #6 runs the hottest, although my ADR instructions do say to mount at the front.

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2001 sport 4x4 CCLB, 4" turbo back w/ 5" tip. Adrenaline w/ Pulse, Amsoil 4510, PS 62/14, leveled with H2 alloys.

[Shagginwagon]

Originally Posted by 05ComminsRail

Hey guys I often see pictures of another persons truck and you can see their pyrometer probe in the top of the manifold forward of the outlet. According to the installation sheets that came with my gauges it should be in the rearward part of the outlet. Just curious if it will make a difference in the reading or what the theory is behind the different location.

Either location will work fine. According to the install instructions by Diesel manor the location on the top of the manifold is where you will have the highest temps. I kinda buy in to the theory that #'s 4,5, and 6 will run hotter because 1, 2, and 3
recieve the most fresh air. But who knows.

Originally Posted by D45

I have mine in the rear portion of the manifold, because the rear 3 cylinders will prouce the most heat....

I have heard that the front pyro position can result in a 200-300 difference in EGT temps.

The rear 3 cylinders don't produce any more heat than the front three cylinders, they just don't get as much fresh air from the fan-- so they run hotter.

FWIW, I've had my temps up to 1300 for about 5 seconds--- no problems, but didn't want to stay there long.

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'07 2500 5.9L Mega, Black, Laramie, 4X4, 48re

Isspro's, AFE Pro Dry, BMK-11, Edge EZ,

Smarty JR.

422HP/854TQ

IAFF Local 1159

[r_anderson65]

Mines in the rear but once it gets close i back off, so even the 300 degrees wouldnt really matter once it gets close you back off and cool down. but as said the rear gets the hottest

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Robert Anderson-04.5 Qc/Sb 4x4 9" Lift, 37's on 18's, Mag Hytec Covers,Full Synthetics Everywhere, S&B CAI, 4" Banks Exhaust, Banks 6 Gun w/PDA

[04dodgedsl]

someone today told me that EGT gauges aren't very accurate, that whatever the gauge reads i need to add 200-300 degrees to get my real temp. Is this true, or anyone heard of this??

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2004 Dodge 2500, 4x4, Goerend w/ some Billet stuff. AFE stage 2 intake, AFE intake manifold, ISSPRO gauges, FBD 5" turbo back, Airdog 150, Smarty. Suspended by Thuren, Carli, KORE.

[Rocksolidcummins]

Originally Posted by 04dodgedsl

someone today told me that EGT gauges aren't very accurate, that whatever the gauge reads i need to add 200-300 degrees to get my real temp. Is this true, or anyone heard of this??

probably more accurate than guessing!

whoever it was probably just forgot to include the deciding information. a post turbo egt probe will read 200-300 degrees cooler than the actual exhaust gas temperature leaving the head.

the turbo absorbs quite a bit of heat, around 200-300 degrees immediately, probably more if given enough time.

remember that turbo gas engines egt @ 1500 degrees plus for the entire length of a run. our diesels probably can handle more than the 1400 deg safe limit, but that is our buffer for the possible 10-25% difference between gauge and actual.

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2004 305/555 Reg Cab - NV56 - 4 35" Cooper S/T's - Diablosport Pred w/ RKL - C2 Guages - 40 psi from hx35 and just getting started

[Shagginwagon]

Originally Posted by Rocksolidcummins

probably more accurate than guessing!

whoever it was probably just forgot to include the deciding information. a post turbo egt probe will read 200-300 degrees cooler than the actual exhaust gas temperature leaving the head.

the turbo absorbs quite a bit of heat, around 200-300 degrees immediately, probably more if given enough time.

Very true! ^^^^^^

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'07 2500 5.9L Mega, Black, Laramie, 4X4, 48re

Isspro's, AFE Pro Dry, BMK-11, Edge EZ,

Smarty JR.

422HP/854TQ

IAFF Local 1159