203 Degree Thermostat?? - Diesel Forum - TheDieselStop.com
Ford Diesel Forum / Powerstroke Forum
Ford Diesel Forum / Powerstroke Forum
Go Back   Diesel Forum - TheDieselStop.com > 1999-2007 Ford Super Duties > 99 & up 7.3L Power Stroke Engine and Drivetrain

99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

TheDieselstop.com is the premier Diesel Truck Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 01-10-2007, 01:33 PM   #1 (permalink)
Member
 
Join Date: Oct 2006
Posts: 44
My Photos: (0)
Feedback Score: 0 reviews
203 Degree Thermostat??

Can someone please school me on the 203 degree thermostat....what makes it special? Only used in certain applications?

Thanks for the education.....I've learned many useful things on this forum.
__________________
OS
'99 F350 Superduty 7.3l 4x4 Crew Longbed
Revo'd
Monroe'd
Pillar'd
Zoo'd
Level'd
nicka is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 01-10-2007, 02:14 PM   #2 (permalink)
Senior Member
 
HemRojtas's Avatar
 
Join Date: Aug 2004
Location: Suburban Baltimore, MD
Posts: 112
My Photos: (0)
Feedback Score: 0 reviews
Re: 203 Degree Thermostat??

Click Here for everything you could want to know about it.
__________________
2006 F-250 KR PSD 4x4 towing a 38' Copper Canyon 5th Wheel.
HemRojtas is offline   Reply With Quote Quick reply to this message
Old 01-11-2007, 12:26 PM   #3 (permalink)
Member
 
Join Date: Nov 2006
Location: NV
Posts: 39
My Photos: (0)
Feedback Score: 0 reviews
Re: 203 Degree Thermostat??

Installed mine when I changed out my coolant. Can't hurt. While you're buying stuff from the Dieselsite pick up their oil pan petcock. I LOVE this thing.
__________________
1999 F350 DRW 110K and still pulling hard! 3 Pillar gauges, Tymar-"like" Air filter mod/airbox delete, 5" MBRP exhaust w/ a 6" tip, 203 Thermostat, Coolant filter, fuel pump pre-filter and tank mixer removal mod, Zoodad, Fumoto oil drain valve,
atwon is offline   Reply With Quote Quick reply to this message
Old 01-11-2007, 12:56 PM   #4 (permalink)
Senior Member
 
Join Date: Mar 2005
Location: Little Elm, Texas
Posts: 157
My Photos: (3)
Feedback Score: 0 reviews
Re: 203 Degree Thermostat??

[ QUOTE ]
Installed mine when I changed out my coolant. Can't hurt. While you're buying stuff from the Dieselsite pick up their oil pan petcock. I LOVE this thing.

[/ QUOTE ]

I second that.
__________________
1999 F-250, 4X4, 7.3L PSD, Crew Cab
203 deg T-stat, Walker BTM, AirAid Intake,
HX Crossover Line, Ice Cold AC (Thanks Dieselsite), Fumoto Plug, Isspro Pyro and Boost Gauges
babyarm is offline   Reply With Quote Quick reply to this message
Old 01-11-2007, 01:20 PM   #5 (permalink)
Senior Member
 
NCHornet's Avatar
 
Join Date: May 2004
Posts: 6,916
My Photos: (1)
Feedback Score: 0 reviews
Re: 203 Degree Thermostat??

I too like the Fumot valve but I find a 203 thermostat to not be a needed item. Unless you needed a thermostat anyway, although 203 costs about 5 times what a reg thermostat costs and I am not sold on 8 degrees making that big of a difference. But some will claim 25 extra HP and 2 more mpg.
__________________
NCH
2000 Ford F350 4X4 Auto,Crew Cab Lariat, Western Hauler Package, Long bed,
Isspro EV Guages on A-Pillar, Coolant change from Green to Gold to Red,
SCT XCalibrator2 with DP's 60 tow,80 econo,120 Race
Fumoto Valve, Marinco Mod, Homemade CCV MOD,Fuel Neck Mod, KMC Wheels at all 4's
Monroe Reflex Shoxs, SS/Kevlar Brake Lines,
FTVB from Greg Evans,Ford AIS Intake
Coolant filter,Walker BTM, Attwood Gooseneck ball flush mount,6.0 cooler, 2002 headlights & corners
Zoodad Mod,Cyro'd Powerslots and Hawks LTS Pads. 2005 front grill
Turbo Lifesaver, Infinity Refrence x4, powered by Infinity Reference amp, sounds awesome!!
Towing a 2005 HORNET 30BHSS 8500 LBS,
Stopping it with a Prodigy P3 Controller

Friends Don't Let Friends Drive Trucks With Generic Tunes!!

White Stroker
NCHornet is offline   Reply With Quote Quick reply to this message
Old 01-12-2007, 05:59 AM   #6 (permalink)
Senior Member
 
Join Date: Dec 1999
Location: Chelmsford, Mass
Posts: 376
My Photos: (0)
Feedback Score: 0 reviews
Re: 203 Degree Thermostat??

Makes your wallet thinner. Thats all.

Tried the higher temp tstat, no more power, no more increase in HP departments. The housing can be just as leaky as OEM housings.

I was hoping I would see beter MPG, power and no more leakage issues on the trucks - wishful thinking on my behalf. [img]/ubbthreads/images/graemlins/frown.gif[/img]

Butch
__________________
Y2k F-250, PSD, auto, SC, 4 x 2, XLT,
A-Pillar mount gauges, Turbo Brake, Air Horns, APCM, LS 3.73 axle, Grille guard, Evans NPG+,.
butch cassidy is offline   Reply With Quote Quick reply to this message
Old 01-12-2007, 09:20 AM   #7 (permalink)
Lifetime Supporting Member
Lifetime Supporting Member
 
Kanman's Avatar
 
Join Date: Dec 2004
Location: Wichita, Ks.
Posts: 5,119
My Photos: (2)
Feedback Score: 0 reviews
Re: 203 Degree Thermostat??

[ QUOTE ]
Makes your wallet thinner. Thats all.

Tried the higher temp tstat, no more power, no more increase in HP departments. The housing can be just as leaky as OEM housings.

I was hoping I would see beter MPG, power and no more leakage issues on the trucks - wishful thinking on my behalf. [img]/ubbthreads/images/graemlins/frown.gif[/img]

Butch

[/ QUOTE ]

WHY? Why would anybody actually think they would see a noticeable gain in power or fuel mileage? You do know this is a thermostat right, and not a magical bean?
Kanman is offline   Reply With Quote Quick reply to this message
Old 01-12-2007, 09:30 AM   #8 (permalink)
Senior Member
 
Join Date: Jan 2002
Location: NY
Posts: 3,148
My Photos: (5)
Feedback Score: 0 reviews
Re: 203 Degree Thermostat??

Can't say I noticed any real difference, but the housing still looks like new and hasn't leaked. Some have seen a mileage bump. When my stat goes I probably still will get another 203.
__________________
2002 F-250, PSD 6-speed, CC, short bed, 4X4, Toreador Red w/ Silver accent, A.R.E mx cap, Weld Super Single II and 33s in the summer, x-springs, F-350 blocks and badges, AIC, proflaps, ITP intank mod, AirDog with 3 micron filter, isspro guages and TTM, scangauge, husky liners, alarm, xm stereo,stull 5399-p grille, centramatics, ccv mod, AIS Air Filter, Southbend CON O, Detroit Truetrac LSD, coolant filter, 203 stat with billet housing, blackcloud intake heater plug/boost fitting, reese titan hitch, fabcraft PTO cover/temp sender port, prodigy brake controller, ITP Boost Annihalator, oilguard bypass filter, Mag-Hytec rear dif, bilsteins, hellwig rear stabilizer bar, ATS housing, non-ebpv pedistal and exhaust flange, magnaflow 3.5dp exhaust, ITP reg return, turbomaster wastegate controller, and ceramic coated bellowed up pipes, PHP 50t and 80p, currently 105,000 miles.
clydesdale is offline   Reply With Quote Quick reply to this message
Old 01-12-2007, 10:38 AM   #9 (permalink)
Senior Member
 
Tony_ONeil's Avatar
 
Join Date: Jul 2006
Location: Spring Lake Park, MN
Posts: 564
My Photos: (2)
Feedback Score: 0 reviews
Re: 203 Degree Thermostat??

mine runs a little quieter once she's warmed up, and i did see a "slight" increase in mileage, but only with limited testing as ulsd and winter blend fuel hit the roads.
__________________
2002 F-350 Crew Cab Lariat 4x4 7.3L Auto SRW
AFE Stage II Intake, AFE 4" Turbo-Back Exhaust, CCV Mod, Zoodad Mod, Pre-pump Mod, Flex-A-Lite Tranny Cooler, Draw-Tite Activator II Trailer Brake Control, IC Foil Wrap Delete, 203 Thermostat, Ford reman. Turbo, Fleetrite HD ELC, Rotella 5w-40 Synthetic, 4300K 35Watt dual beam HIDs, DB High-Torque Starter, Isspro EV gauges (trans,boost,pyro)
Tony_ONeil is offline   Reply With Quote Quick reply to this message
Old 01-13-2007, 07:07 PM   #10 (permalink)
Senior Member
 
Join Date: Dec 1999
Location: Chelmsford, Mass
Posts: 376
My Photos: (0)
Feedback Score: 0 reviews
Re: 203 Degree Thermostat??

[ QUOTE ]
[ QUOTE ]
Makes your wallet thinner. Thats all.

Tried the higher temp tstat, no more power, no more increase in HP departments. The housing can be just as leaky as OEM housings.

I was hoping I would see beter MPG, power and no more leakage issues on the trucks - wishful thinking on my behalf. [img]/ubbthreads/images/graemlins/frown.gif[/img]

Butch

[/ QUOTE ]

WHY? Why would anybody actually think they would see a noticeable gain in power or fuel mileage? You do know this is a thermostat right, and not a magical bean?

[/ QUOTE ]

This tstat is advertised as providing an increase in fuel mileage and power THATS WHY.

It goes to show consumers have to be very careful on bogus sales and marketing claims some sponsors will put on the website. Let the buyer beware. [img]/ubbthreads/images/graemlins/frown.gif[/img]

Butch
__________________
Y2k F-250, PSD, auto, SC, 4 x 2, XLT,
A-Pillar mount gauges, Turbo Brake, Air Horns, APCM, LS 3.73 axle, Grille guard, Evans NPG+,.
butch cassidy is offline   Reply With Quote Quick reply to this message
Old 01-14-2007, 04:30 AM   #11 (permalink)
Senior Member
 
Join Date: Aug 2000
Location: Spicewood, Tx
Posts: 3,640
My Photos: (0)
Feedback Score: 0 reviews
Re: 203 Degree Thermostat??

By increasing the temp of the coolant, usually the engine efficentcy is increased, the old engines used to run 160's now they are up to 240's...

It makes sense to me..I haven't done any testing on mine yet..

as others have observed the increased heat through the heater is great though.
__________________
2000 F250 SC 4A SB OEM TC, OEM Trans, OEM Turbo, OEM Injectors, OEM Airbox, OEM CAC, Quad Pod W/4 Autometers, 3 Guage cubby-hole, Jody-isized, Fuel System Mods, Mag Hy-Tec, Schaefers 9000, Transgo, Interior is soundproofed, 3.5" DP SS XL Magnaflow, LPG, 106k miles, NVK5 to MNMO, 2200 WATT BI-AMP, 18"s, Best MPG-22.80, Best MPT-760 miles.
FORD-DIESEL.COM MODS--Heater Hose Cutoff Valve, T/C lock, EBV brake, MIAH Plug, QD's removed, Wrapped CAC Tubes, Double Clamped Coolant Hoses, Zoodad, Relocated License plate, painless fuse box. Other RSB Mods
388HP 818Ft.Lbs.@ 130MPH. 4th gear dyno run, 2.1 60, Home-Made Traction bars.
This is a Street truck, 18+MPG(No LP), 14.2 at 98mph, 13 sec Motor, 14 sec Truck(NO Traction)
2004/03 CC SB Auto 6L W/OCT flash, 19+MPG, 20%Bio, AFE, Magnaflow XL SS 4" Exhaust, 75K, Heater By-pass mod, 21.1 MPG best.
2006.5 Jetta DSG 14K 41MPG Best
2005.5 VW Jetta 1.9 TDI 49MPG Best 73K
Kubota 7800 30 HP Hydrostatic 4X4
All Diesels
1969 Mach1 351C 4M 9"
Mach1 is offline   Reply With Quote Quick reply to this message
Old 01-14-2007, 07:46 AM   #12 (permalink)
Senior Member
 
Join Date: Mar 2005
Location: TN.
Posts: 180
My Photos: (0)
Feedback Score: 0 reviews
Re: 203 Degree Thermostat??

It will make your inside heat hotter thats the only thing I could tell
__________________
2000 f250 cc lariet 4x4,tank an pump mods,shimmed fuel reg.70psi,dp F5 stock 40t& 60t
reg2862 is offline   Reply With Quote Quick reply to this message
Old 01-14-2007, 08:21 AM   #13 (permalink)
Senior Member
 
Powerstrokedogg's Avatar
 
Join Date: Oct 2003
Location: Upper pensula st.ignace , MI
Posts: 2,301
My Photos: (8)
Feedback Score: 0 reviews
Send a message via ICQ to Powerstrokedogg
Re: 203 Degree Thermostat??

you guys can't expect to see a 5 MPG increase, and 20 HP, 50 FT lbs of torque [img]/ubbthreads/images/graemlins/rolleyes.gif[/img]

the increases are slight but its where this engine runs good
__________________
2001 F-350 7.3L 4X4(ESOF) CC LWB 4R100 4X4, WIX 46637 open element air filter, Wicked Wheel, walker BTM, 203* Tstat, IC tube foil removed, coolant filter, AIH removed, 08 aluminum finned rear end cover, DP tuner 80econ 140smoke high idle,Phantom gauges, ATS transmission,ATS deep trans pan, 5 star torque converter, V10 trans cooler, 4" MRBP SS downpipe, twin 4" stacks

1989 F-250 6.9L IDI E4OD 500,000+ miles(sold)
1982 VW rabbit 1.6L diesel
2007 Arctic cat 700 diesel ATV
1975 W900 Kenworth 500 Cummins
1997 Ford school bus 5.9 cummins
Powerstrokedogg is offline   Reply With Quote Quick reply to this message
Old 01-16-2007, 01:38 PM   #14 (permalink)
Senior Member
 
Join Date: Oct 1999
Location: Albany, OR
Posts: 754
My Photos: (0)
Feedback Score: 0 reviews
Re: 203 Degree Thermostat??

It's a relatively inexpensive mod, but the gains sound very insignificant. I'd do it if I needed a new thermostat anyway.
__________________
Dennis
'99.5 F250 4x4 SC 6 speed 3.73 LS, Magnaflow 4" exhaust, South Bend con-o clutch.
The_Dude is offline   Reply With Quote Quick reply to this message
Old 01-16-2007, 03:54 PM   #15 (permalink)
Senior Member
 
Join Date: Jan 2002
Location: Corner of SD, Ia. & Neb.
Posts: 369
My Photos: (0)
Feedback Score: 0 reviews
Re: 203 Degree Thermostat??

NChornet said, "But some will claim 25 extra HP and 2 more mpg."

I've searched this site's active and archived files about higher temperature operation, most commonly enabled by restoring the 1995 203 degree specification thermostat value to newer engines which were fitted with 195 degree thermostats ONLY to improve nitrous oxide emission values at a clear disadvantage to their thermal efficiency. I've also read a lot about this issue as it relates to non NaviStar diesels. Your statement is the only example I recall claiming even close to "25 extra HP and 2 more mpg."

Please provide a citation by which we can verify that anyone ever made such a claim. I've seen consistent references to small incremental gains, typically translated into about 0.5 mpg maximum gains on these trucks, and then only when they are fully warmed. Frankly, that's a LOT! We can easily estimate miles traveled and fuel burned before 203 degree conversion cost is fully recovered by fuel expense saving. After that, fuel expense savings would be a permanently flowing gain.

This change produces small but 100% consistent MPG improvements while marginally worsening nitrous oxide emissions. Power gain at any fully-warmed throttle setting does exist. But those incremental changes are very small so they can only be measured through sensitive tests. That power gain is much too small to be noticed through "seat of the pants" acceleration comparisons.

As a certifiable MPG contest participant for about 4 decades, I will install an engine temperature changing system into my recently acquired 2000 truck. By far the easiest way to do that well would be to buy one of these aftermarket 203 degree adapters. A thermostatically-controlled electric-motor-driven plunge valve with dash-mounted adjustable temperature threshold control would allow exploring the full range of performance differences thermostatic controls can produce. Creating and enjoying devices like that is only well suited for people who love exploring maximum efficiency just as drag strip contestants enjoy exploring ways to minimum their elapsed times. I've done both and the fun from testing limits in both performance arenas feels similar.

You're wrong to attack 203 degree thermostat replacements. Your claim that others claim "25 extra HP and 2 more mpg" sounds exactly like "putting up straw man to knock down" because that claim does not square with any credible previous reference I've read about this issue.
John
__________________
One measure of life success is whether you wrinkle your brain faster than you wrinkle your skin.
Lightest 1995 Standard Cab PowerStroke F-250 with factory "Camper Package," no AC, 5-speed, Conklin ParaSynthetic Oil with MolyLube, oversized 10-micron filter, Randy's Ring & Pinion aftermarket 3.07 ratio running in Royal Purple, Stanadyne always in fuel, tires @ 100 psi, nearly zero friction brake adjustments, 203 degree thermostat enables higher engine efficiency than 195 degree units, front end precisely aligned with minimal toe-in to reduce friction, lowest rolling friction F-250 I've seen. 2-axle trailer tires run 110 psi generating less rolling friction than lower pressure tires. Infrequently carried slide-in camper is an older all-hard-side Siera pop-up. Hard sides seem more secure than canvas connected pop-ups when up and never have canvas mold problems. Pop-ups push less wind than fixed height slide-ins.
LoveLearn is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

  Diesel Forum - TheDieselStop.com > 1999-2007 Ford Super Duties > 99 & up 7.3L Power Stroke Engine and Drivetrain

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Diesel Forum - TheDieselStop.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



Wheel & Tire Center

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 07:37 PM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.