Tstat ?
Thread Starter
|
Posting Guru
Joined: Jan 2015
Posts: 1,001
Likes: 8
From: NC Mountains
Tstat ?
My 96 F350 7.5 ZF5 4wd runs great. It has tons of low end grunt and will flat run away from my V10 SD I recently sold (torque peak 1200RPM lower, what do you expect ). It has a Magnaflow high performance cat and muffler which exits in front of the rear tire. The AIR and EGR is deleted and the air horn is cut. All vac lines have been repaired or replaced and there are no leaks.
Truck gets 13+ MPG on trips (no exaggeration) and I don't want to mess that up. I have the timing set at 8* due to slight ping when set at 12* (wanted a margin of protection). I know the EGR delete is part of it but it is not going back on.
The Tstat is stock 195*. The truck seems to run on the high side of the middle on the gauge. If I put in a 180* Tstat wouldn't this help cool the heads enough that I might could get timing up to 10-12? As long as the computer does not see temps cool enough to force open loop this shouldn't negatively affect my mileage.....right? The added timing might even net me a little positive mileage.....
Truck gets 13+ MPG on trips (no exaggeration) and I don't want to mess that up. I have the timing set at 8* due to slight ping when set at 12* (wanted a margin of protection). I know the EGR delete is part of it but it is not going back on.
The Tstat is stock 195*. The truck seems to run on the high side of the middle on the gauge. If I put in a 180* Tstat wouldn't this help cool the heads enough that I might could get timing up to 10-12? As long as the computer does not see temps cool enough to force open loop this shouldn't negatively affect my mileage.....right? The added timing might even net me a little positive mileage.....
Cargo Master
Joined: Nov 2013
Posts: 2,168
Likes: 4
From: South Central,MO
I ask the same question yesterday. I was told that a 180* thermostat will run just fine. That is plenty hot enough to satisfy the computer, but cooler enough that it MIGHT, and I said MIGHT, help with the detonation problem.
You said you have it set a 8*, that is 2* BELOW factory setting of 10*. You need to run it at least at the factory setting, then increase it very tiny amounts until you start to get a few pings, then back it off 1 degree from there. Then check it with the timing light again. If it shows below 10*, your balancer ring may have slipped. Heck, you might be able to get 14 or 15 MPG after doing that! My 89 in my sig runs best at 11*, 12* was just a little to much for it too.
You said you have it set a 8*, that is 2* BELOW factory setting of 10*. You need to run it at least at the factory setting, then increase it very tiny amounts until you start to get a few pings, then back it off 1 degree from there. Then check it with the timing light again. If it shows below 10*, your balancer ring may have slipped. Heck, you might be able to get 14 or 15 MPG after doing that! My 89 in my sig runs best at 11*, 12* was just a little to much for it too.
Thread Starter
|
Posting Guru
Joined: Jan 2015
Posts: 1,001
Likes: 8
From: NC Mountains
Well my reasoning for backing it off to 8 was due to the EGR not being present and the ping you don't hear is the dangerous one. I wanted a little insurance. I think I will just pop one in and see what happens. I have some BG Super Cool too I will add. They claim it helps transfer heat better than coolant alone. I might experiment with one step cooler plugs and a MSD later on.
This truck will accelerate in 5th up hills that my old V10 would have to downshift on to maintain speed
Makes no sense to me on paper, the V10 has a much longer stroke. I guess those big pistons in the 460 are more than enough to make up the difference. 400lb/ft at 2200 is pretty good for a low compression dinosaur. The V10 is a revver which also makes no sense with that long stroke.
I drove my wife's 2000 Eddie Bauer Expedition (like new) last night and I thought a couple of times there was something wrong with it because of the lack of torque LOL. I have been driving the F350 for a few weeks and it has spoiled me.
This truck will accelerate in 5th up hills that my old V10 would have to downshift on to maintain speed
Makes no sense to me on paper, the V10 has a much longer stroke. I guess those big pistons in the 460 are more than enough to make up the difference. 400lb/ft at 2200 is pretty good for a low compression dinosaur. The V10 is a revver which also makes no sense with that long stroke.
I drove my wife's 2000 Eddie Bauer Expedition (like new) last night and I thought a couple of times there was something wrong with it because of the lack of torque LOL. I have been driving the F350 for a few weeks and it has spoiled me.
Lead Driver
Joined: May 2011
Posts: 5,790
Likes: 449
conventionally, hot thermostats yield the best mileage. its one of the reasons the manufacturers keep em hot.
there are exceptions, but its a trial and error process. "tuning", if you will.
a cold thermostat with no changes otherwise, will net worse mileage. a cold thermo with aggressive timing could help, but it'll depend on some other variables whether or not youll see any gains.
high compression, head porting, and long tubes are the best formula for mileage increase.
I've never liked the v10...I think its a pointless modular giant. it's increased stroke over the 460 isn't all that substantial, so the "no replacement for displacement" certainly plays a part in your experience. however, the most substantial difference is most likely in the weight of the two trucks. the SD is a mammoth, these trucks are pretty light in comparison.
there are exceptions, but its a trial and error process. "tuning", if you will.
a cold thermostat with no changes otherwise, will net worse mileage. a cold thermo with aggressive timing could help, but it'll depend on some other variables whether or not youll see any gains.
high compression, head porting, and long tubes are the best formula for mileage increase.
I've never liked the v10...I think its a pointless modular giant. it's increased stroke over the 460 isn't all that substantial, so the "no replacement for displacement" certainly plays a part in your experience. however, the most substantial difference is most likely in the weight of the two trucks. the SD is a mammoth, these trucks are pretty light in comparison.
Thread Starter
|
Posting Guru
Joined: Jan 2015
Posts: 1,001
Likes: 8
From: NC Mountains
I've never liked the v10...I think its a pointless modular giant. it's increased stroke over the 460 isn't all that substantial, so the "no replacement for displacement" certainly plays a part in your experience. however, the most substantial difference is most likely in the weight of the two trucks. the SD is a mammoth, these trucks are pretty light in comparison.
I think there will be little change in mileage with the OBD1 setup like this compared to a OBD2 with a lower temp. Maybe none if I can get the timing to 10-12*.
I will report back when I figure it out.
Thread
Thread Starter
Forum
Replies
Last Post
stryder222
Modular V10 (6.8l)
7
Apr 12, 2013 10:46 AM
79 E350 rescue
Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460)
6
Nov 3, 2005 12:58 AM
Truckin Bob
Ford Inline Six, 200, 250, 4.9L / 300
6
Mar 14, 2004 10:44 AM
