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Join Date: Nov 2007
Location: Austin, TX
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The temperate difference between the downpipe and the pre-turbo location are not going to simply be a number that you "know". Not to go too deep into it ... but the temperature difference between the two locations is a dependent on both the differences in pressure and in heat content (enthalpy). Basically, the temperature difference between these locations is going to be a function of how much work the exhaust is doing on the turbine-end of the turbo ... as well as conductive heat losses through the plumbing on the way.
If the purpose of watching EGTs is to protect the turbo... then monitor upstream of the turbo. The amount of uncertainty of the relationship between EGTs upstream and downstream of the turbo is so large that monitoring it downstream would be unnecessarily limiting.
You might just end up ignoring the parameter in the end ... if you decide a "safe" number is 500 degrees difference but the truck isn't fast enough for you or can't tow long enough then you might just decide this week that 400 degrees is probably safe enough ... or 300 ... or you'll just drive it until it performs like you like and set the limit there.
2002 F-250 Lariat Extended Cab Long Bed, 7.3L, Auto, 4x4
- 6" BDS Suspension lift (All spring)
- 315/75R16 BFG A/Ts
- DP-Tuner F6
- DIESELSITE CPR Fuel System
- Turbo-Master Wastegate Controller
- Donaldson AIS Intake w/ "Zoodad" and AIH Delete
- MBRP 4" T304 Exhaust
- Coolant filter, Evans NPG+ Coolant, 203* Thermostat and Billet Housing
- Factory Tech Valve Body
- ISSPRO Gauges (Boost, Pyro, Trans)