Pre or post turbo pyrometer
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Senior User
Joined: Feb 2004
Posts: 144
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Pre or post turbo pyrometer
I have the Autometer phantom series and am trying to figure out if its calibrated for pre or post. The instructions sent with it described placing the probe in the down pipe. When I called Autometer, they advised it was for pre turbo. I used the post placement due to d/pipe already having bung for probe. W/ my mods as described in signature and chip setting on 75, here are my average numbers. Unloaded - cruise 600-700 5-7 psi boost, hard acceleration 750-850 21-22psi. Loaded w/ 11,500 5ver - cruise 700-800 8-10psi, up hill pull maintaining 65-70mph 900-1100 20-25psi. How do these numbers compare to those of you with similar mods w/ pre turbo pyro?
Fleet Mechanic
Joined: Feb 2005
Posts: 1,797
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From: Northern Colorado
Some pyros have color coded guage faces that are different for pre vs. post turbo and are just shifted down the temperature scale. Post-turbo temps will read 200º-300º below pre-turbo. So instead of a 1250º max, you need to try and keep them below 950º-1000º. A pyro only measures temps.. 1000º pre is 1000º post, the exhaust just cools down by the time it hits the downpipe.
Fleet Mechanic
Joined: Feb 2005
Posts: 1,797
Likes: 1
From: Northern Colorado
Originally Posted by jsmahan
Guzzle, are you pre or post. If pre what temps are you seeing w/ the chip?
Senior User
Joined: Jan 2005
Posts: 156
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From: Colorado
Originally Posted by guzzle92
My pyro is pre. With the 4" exhaust, I can get it close to 1250º with my foot into it HARD on 50hp, empty. I won't know what it'll do with the 5er pullin hard till this summer. Looking at -8º F right now, not good camping weather!
Lead Driver
Joined: Oct 2004
Posts: 7,413
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From: Columbia, MO
Originally Posted by jsmahan
W/ my mods as described in signature and chip setting on 75, here are my average numbers. Unloaded - cruise 600-700 5-7 psi boost, hard acceleration 750-850 21-22psi. Loaded w/ 11,500 5ver - cruise 700-800 8-10psi, up hill pull maintaining 65-70mph 900-1100 20-25psi. How do these numbers compare to those of you with similar mods w/ pre turbo pyro?
Be very, very careful at anything over 1000, post turbo. You're in serious risk of some very expensive damage in that range. If it gets that high, back off the go pedal a little. It's not worth risking a $10K engine for 5-10 mph up a hill.
