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| 1999 to 2003 7.3L Power Stroke Diesel 7.3L Power Stroke Diesel equipped Super Duty and Excursion |
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#1
Thu, January 28th, 2010, 07:15 PM
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203*F thermostat
I have seen the claims for the 203*F thermostat swap for the PSD's but I am wondering if it really makes any difference at all on the vehicle performance as everything on the PSD is dependant on Engine Oil Temp not on coolant temp so changing from 195* to 203* would not see like it should make a real difference...
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DJ Phoenix (my modded) Hi-1200/240Tow/75FS/80DD/100/140SS +Minotaur ASE Master Auto Technician  2001 Ford Excursion 7.3 4x4 Projects. 1970's Hustler and Max II Amphibious ATV's 
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#2
Thu, January 28th, 2010, 07:20 PM
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The hotter the coolant, the hotter the oil.
Anyway, to get to the point, there is no reason to change it. Save your $$$.
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Tuning, flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes. SEVEN 7.3L-powered vehicles in the driveway. Two didn't come that way from the factory!
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#3
Thu, January 28th, 2010, 08:34 PM
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that was my thinking too.... 8*F is not gonna change a whole lot
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DJ Phoenix (my modded) Hi-1200/240Tow/75FS/80DD/100/140SS +Minotaur ASE Master Auto Technician 2001 Ford Excursion 7.3 4x4 Projects. 1970's Hustler and Max II Amphibious ATV's
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#5
Thu, January 28th, 2010, 09:36 PM
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Oh gawd....My heater already cooks me at temps. near -20F. It's hard to get comfortable because I'm either cooking or freezing. There is no in-between with this truck.
I suppose at the North Pole though.... 
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Tuning, flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes. SEVEN 7.3L-powered vehicles in the driveway. Two didn't come that way from the factory!
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#8
Fri, January 29th, 2010, 11:28 AM
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wanna make a bet if I asked this same question over on the PSD forums I would get people swearing up and down they get better MPG, more HP, 30 second warm up ..... etc...
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DJ Phoenix (my modded) Hi-1200/240Tow/75FS/80DD/100/140SS +Minotaur ASE Master Auto Technician 2001 Ford Excursion 7.3 4x4 Projects. 1970's Hustler and Max II Amphibious ATV's
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#9
Fri, January 29th, 2010, 12:27 PM
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Sucks how information gets repeated over and over regardless if it true or not. One guy believed the hype and swore by it, so now its just common knowledge.
But seriously Dieselsite has very high quality products! I recently purchased a few products from them and I am extremely impressed! Very professional business to boot.
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#10
Fri, January 29th, 2010, 08:14 PM
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I installed one last march I couldn't tell much if any improvement in performance. The biggest difference was the heater and less black smoke when I really layed in it. Although even with out a manuel gauge I think my old stat was opening to soon even for a 195. Reason being my heater wasn't the greatest and my oil temp would never get over 160 unless I was running 80+ down interstate for awhile and then might hit 165. I do think I gained a tenth or two in mileage but could have been a fluck.
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WHEN IN DOUBT FLOOR IT!  IF IT'S TOO LOUD YOUR TOO OLD!  99.5' F-250 EXTCAB 4X4 6SPD 4" LIFT 35" TIRES 3.73 GEARS K&N INTAKE, GTP38R W/TURBO MASTER WASTEGATE CONTROLLER, 203DEG THERMOSTAT, EVO II,AND MBRP COOL DUALS EXHAUST NO MUFFLER
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Linear Mode
