Pre or Post Turbo
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Senior User
Joined: Nov 2002
Posts: 256
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From: St.Augustine Beach,Florida
Pre or Post Turbo
hey im putting in my pyrometer. i was wanting to know should i put it in pre turbo or post turbo? people on here have said they have heard of them breaking off or melting and going in to the turbo and messing it up. is this common. the only thing i dont like about post turbo is its not as acurate as if i would put it pre turbo in the up pipe. please i need opinions thanks.
1999 F-250 4x4 Lariat S/C PSD Diablo Delta Chip
1999 Mustang Cobra 4.56 gears,power pullies,short shifter,timing adjuster,flowmaster exhaust no cat's
1999 F-250 4x4 Lariat S/C PSD Diablo Delta Chip
1999 Mustang Cobra 4.56 gears,power pullies,short shifter,timing adjuster,flowmaster exhaust no cat's
Elder User
Joined: Aug 2002
Posts: 772
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From: Salem USA
Pre or Post Turbo
Comes down to what degree of risk you are comfortable with. The mechanic I take my rig to has even seen the 'competition' grade probes melt.
It isn't a big deal to add 200 degrees to the gauge reading for me vs. taking the risk of having to replace the turbo.
He also told me that the modern turbos aren't as sensitive to heat as they once were either, (not that you want to chip it, tow 8000+ pounds with your foot to the floor and not give it a thought), but as compared with the older turbos (didn't have sealed bearings, etc???) they aren't as sensitive to heat.
It isn't a big deal to add 200 degrees to the gauge reading for me vs. taking the risk of having to replace the turbo.
He also told me that the modern turbos aren't as sensitive to heat as they once were either, (not that you want to chip it, tow 8000+ pounds with your foot to the floor and not give it a thought), but as compared with the older turbos (didn't have sealed bearings, etc???) they aren't as sensitive to heat.
Junior User
Joined: Aug 2002
Posts: 64
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From: Washington
Pre or Post Turbo
Starrott04 -- No question in my mind. Pre-turbo. It is not as easy as adding a couple hundred degrees. Testing with dual probes has yeilded up to a 500 degree difference depending on boost levels. This was with a modified truck, but even a stock one can get a 300 to 400 degree variance at upper boost ranges. You can use a sliding scale and add degrees as the boost levels rise, but there really is no need.
I have heard of rumors of probes melting, breaking, or taking out a turbo -- Yet, I have never heard a first hand account. Airplanes have pre-trubo pyros and you can't find a much more strict mechanical atmosphere than airplanes. Except maybe for the military, and some of their units have pre-turbo pyros also. The nice thing about pre-turbo is that you get quick and accurate info immediately. It really isn't that hard to install one either.
I have heard of rumors of probes melting, breaking, or taking out a turbo -- Yet, I have never heard a first hand account. Airplanes have pre-trubo pyros and you can't find a much more strict mechanical atmosphere than airplanes. Except maybe for the military, and some of their units have pre-turbo pyros also. The nice thing about pre-turbo is that you get quick and accurate info immediately. It really isn't that hard to install one either.
Senior User
Joined: Feb 2002
Posts: 444
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From: Carol Stream, IL
Pre or Post Turbo
[updated:LAST EDITED ON 11-Dec-02 AT 06:11 PM (EST)]My vote is pre-turbo. Dale i said it best.
2001 F-350 CC Lariat 4X4 LB PSD SRW, Heated leather, off road package, western snow plow, strobe lights in parking lights, headlights and backup lights, tinted windows, stull billet insert, pioneer cd player, rockford fosgate 700S amp rocking 3 JL Audio 10W0's behind back seat,Infinity Interiors and an Alpine amp, husky liners front and back,Banks transcommand, K&N FIPK, ATS Ported Turbo Housing, Diablo Sport 110HP chip, Hypermax pryo/boost gauge, Hypermax 3.5 inch downpipe and 5 inch exhaust.
2002 F-350 XL 4X4 PSD DRW, XL Decor Package, 9' Heil Dump Body, 8' Western (for now) Poly Plow, Western Pro-Flo 1, Strobes Front and Back, toolboxes and Wheel Simulators.
2001 F-350 CC Lariat 4X4 LB PSD SRW, Heated leather, off road package, western snow plow, strobe lights in parking lights, headlights and backup lights, tinted windows, stull billet insert, pioneer cd player, rockford fosgate 700S amp rocking 3 JL Audio 10W0's behind back seat,Infinity Interiors and an Alpine amp, husky liners front and back,Banks transcommand, K&N FIPK, ATS Ported Turbo Housing, Diablo Sport 110HP chip, Hypermax pryo/boost gauge, Hypermax 3.5 inch downpipe and 5 inch exhaust.
2002 F-350 XL 4X4 PSD DRW, XL Decor Package, 9' Heil Dump Body, 8' Western (for now) Poly Plow, Western Pro-Flo 1, Strobes Front and Back, toolboxes and Wheel Simulators.
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Postmaster
Joined: Feb 2002
Posts: 2,773
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From: Bonney Lake, WA
Pre or Post Turbo
Pre-turbo, all the way. Well said, Dale.
Quadzilla
'95 F-350XLT Crew Cab SRW 4X4 PSD, 35X12.50X16.5's, Limited slip 4.10's, Hypermax downpipe, gutted EBPV, "Catless" in Seattle, "Renegade" 4" exhaust system, CTFD sticker, Air bags on all four corners, TYMAR intake, shimmed fpr, Diablo Delta chip, Fumoto valve, Autometer pyrometer, Sonnax valve, Tricumulator springs, Tru-Cool, HX mod, Magnefine tranny filter,
4R100 pan, Red Line synthetic in transfer case and both diffs, reverse shackle kit.
And a wish list that gets longer every day.
(Thank God for a wife that likes big trucks.)
Pictures: http://community.webshots.com/user/quadzilla100
Quadzilla
'95 F-350XLT Crew Cab SRW 4X4 PSD, 35X12.50X16.5's, Limited slip 4.10's, Hypermax downpipe, gutted EBPV, "Catless" in Seattle, "Renegade" 4" exhaust system, CTFD sticker, Air bags on all four corners, TYMAR intake, shimmed fpr, Diablo Delta chip, Fumoto valve, Autometer pyrometer, Sonnax valve, Tricumulator springs, Tru-Cool, HX mod, Magnefine tranny filter,
4R100 pan, Red Line synthetic in transfer case and both diffs, reverse shackle kit.
And a wish list that gets longer every day.
(Thank God for a wife that likes big trucks.)
Pictures: http://community.webshots.com/user/quadzilla100
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Elder User
Joined: Sep 2002
Posts: 936
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From: Texas
Pre or Post Turbo
[updated:LAST EDITED ON 12-Dec-02 AT 00:22 AM (EST)]HEY! I didnt even relize that was MR. TYMAR himself! Cool, glad to see ya here Dale (You'll know me better as Central Texan / Bryan 
)
)
New User
Joined: Dec 2002
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Pre or Post Turbo
Autometer sells probes that are rated for Top Fuel applications, "If a it survives in a Nitro Methane header it will not break off in ours
I have one on my truck and its Titanium, It was not that much money either around 150$
I have one on my truck and its Titanium, It was not that much money either around 150$
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