203 Thermo
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Laughing Gas
Joined: Mar 2008
Posts: 967
Likes: 7
From: coquitlam,BC
203 Thermo
All you guys that have switched your stock thermo to a 203 deg, did it make much of a noticeable difference in engine performance? Did your dash gauge read any higher? Roy.
Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
Likes: 4
From: Grand Lake, La.
I couldn't feel any difference once I installed the 203* stat. The gauge on the dash is a glorified idiot light, It wont move like a regular gauge. Didn't feel any more performance either. Sorry, I did it because they say my engine likes it hot. 
FTE Leadership Emeritus
Joined: Sep 2003
Posts: 12,258
Likes: 767
From: Houston, Texas
Damn! Me Neither!
Just thought of this, when my water pump was leaking, I took it to David at DI Performance and he said even though my pump was leaking, it would probably never overheat; simply because the cooling system on our trucks is so efficient that it just wouldn't, even with a leak! (he was right btw) In the years that he's been working on diesels (mainly Powerstrokes) he's never seen one overheat unless it had the short stem 203 thermostat.
In plain english, I think that with the efficiency of the 7.3s cooling system, it wouldn't do much. I'll head over there next week, have them hook up the NGS, and we'll see.
Just thought of this, when my water pump was leaking, I took it to David at DI Performance and he said even though my pump was leaking, it would probably never overheat; simply because the cooling system on our trucks is so efficient that it just wouldn't, even with a leak! (he was right btw) In the years that he's been working on diesels (mainly Powerstrokes) he's never seen one overheat unless it had the short stem 203 thermostat.
In plain english, I think that with the efficiency of the 7.3s cooling system, it wouldn't do much. I'll head over there next week, have them hook up the NGS, and we'll see.
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Post Fiend
Joined: Jun 2006
Posts: 9,714
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From: White Mnt's,New Hampshire
I know on the big trucks we swap out the 195 for a 210 stat..recommended by cat..don't know any diff's till you work the truck..when the temps are up and your pulling a hill.. we could feel it pull better..she also throws a lot better heat out the heater...DD guy's wont feel any power gains..just better heat.like said above..the 7.3 has a very good cooling system.if your pulling loads all the time..you should feel a little better power when she is pulling hills...
Lead Driver
Joined: May 2007
Posts: 5,613
Likes: 9
From: Flagstaff, Arizona
if it ain't broke.......don't fix it! Mainly the reason I haven't swapped mine out yet. If it ever fails.....or when I get tired of putting additive in my green stuff and make the changeover, I'll have the stocker 195 in.
Postmaster
Joined: Jul 2006
Posts: 4,993
Likes: 2
From: Bend, OR
Put a 203 in mine, and if your in a stockish truck go for it, a little quieter, little less smoke... but I am going to pull mine and put it in the wifes X and run a stocker... With the injectors and such my oil temp is starting to get in the 220-225-230 range... Water temp stays right at 200 but...
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