No mine only goes to 85, but im just giving a guesstimate. It was definitly way over 85. She wanted to go faster still, but i didnt wanna push it any more and blow up the tranny or something.

 

you should have a faster car run behind you to find out , or a gps thats how i did mine.. a whopping 68 mph lmao

 

I should do that. Beats havin a cop tell me LOL

 

Believe me, I LOVE my 6.9...but in stock form I find it slow in speed and slow to respond, both empty and loaded.
Here's the specs: '85 F350 Long Wheelbase Cab and Chassis. 6.9 N/A, T19 4 speed, 3.55 axle gears. 6,500 pounds empty according to scrap metal scale. IP and Injectors have about 8k miles. Stock fuel settings. Stock air intake.
Empty...I've lost a race to a 4-banger Jeep wrangler.
However: 6500 pounds of truck versus 4000 pounds of Jeep.
It's slow in response when you give it more throttle and it just makes more noise, but doesn't seem to make any changes for a few seconds. Then after a while, it slowly picks up speed, and you eventually get going faster.
I'm truly scared to give the truck throttle. It seems to take a long time to respond, so in my mind I'm scared i'm over-fueling the engine. So, I NEVER leave the truck in high gear when it's under a working engine load (hill). I ALWAYS drop a gear and maintain 1/2 throttle pedal. That's where the speed becomes slow. Maybe I'm over-cautious, but I doubt it...I just finished doing the head gaskets on my rig even though i try my BEST to drive it in a way that is most efficient, and less likely to wear out parts.
Loaded-
I ran a small load of green firewood up some hills around here. I estmate I had about 2,000 pounds in the truck. With 3.55 gears in the rear axle, I was down in 2nd gear on the hills. They're good size hills. Don't know what the grade % is, but easily 1/2 mile long hills.
If I had a long running start, I COULD have made it in third, but it just feels to be under a lot of engine load, and I don't know how much this IDI can take before over-fueling. I don't have a Pyro because it's all stock settings.
Here's the pattern I've noticed and try to drive by. Could be totally wrong, but I feel it to be easier on the engine? I don't know really, just trying to treat it nicely.
If I am approaching a decent hill in fourth gear above 50 mph, I already know halfway up I'm dropping to third. So, I maintain the throttle until I feel the engine under load. I slowly ease out of the throttle until I'm aroud 1/4 throttle. Downshift into 3rd gear. I take 3rd as far as it will go until I feel the engine under load. I drop to second. Second gear really has good reduction in the transmission to maintain a decent 25 mph and good torque. I REALLY wish I could split 2nd gear and get a gear inbetween 2nd and 3rd. I swear it would make climbing a lot easier.
But, If I'm empty I can usually make it up in just third.
My truck will get me into trouble breaking speed limits, it just takes a while to get up to that speed. 55/60 mph seems to be a very efficient speed on my highway commute to school, unloaded.
I pull down 22 mpg with my driving habits and the 3.55 gears. Combination of 50% highway and 50% city miles on my commute to college.
HA. I know you'll be ticked riding in the slow lane if you're used to your Dad's 6.4 PSD. My Dad has an '03 7.3! We went cross country on vacation a few years ago. We had a slide-in camper in the truck bed, while towing my grandparents 32' tandem axle camper. 7,000 pounds of truck + 3,000 pounds of loaded camper + 7,000 (Guessing?) of loaded camper + 6 people and groceries...puts us in the ballpark of 17k - 18k pounds running through the beautful mountains in Colorado. Truck never missed a beat!
So, at 15 years old I was ready for MY truck to do that! Little did I know that a Powerstroke and an IDI were two VERY different animals.

That's a lot of mumbo-jumbo to absorb, but hopefully you can take those experiences and evaluate what you think of them.
Please don't take me wrong. My IDI may be slow, but I won't trade it for anything.
Don't be concerned about the truck moving the weight. These IDI's WILL pull your load...but just be prepared to go slowly.

 

Hitting a hill with 3.55 you need to be around 70 in 4'th 1/2 mile hill you will top it at 65 still in 4'th.
Slow to respond empty isn't right it should move right out unless you are lugging it and that is bad for egt's.

 

22 MPG with your driving style is doing rather well.

Stand on the throttle a little harder, the 22 MPG will go away, but you will find it pulls a lot better.

Basically the engine is governed to speeds that will not hurt it.
Hit that hill at 3000 RPM with your foot on the floor.

 

thank you BlueOvalBud for sharing.just the details i was after!
well,i could tell right off,it was no 6.4 of course.(that's like 350hp/600 trq i think edit-looked on wiki-its close to 650 ft.lol my god man!)
but this idi truck when empty,is completely different from yours.
in fact,i would call it "quick" and fast" while empty.
i didn't time anything,but when i quickly give her some,she has no problem spinning tires.i don't know if she would smoke them or not,i don't want to be hard on my new work truck to find out.
it will get right up to 65-75 with little effort.lots of peddle left,but im not trying more than that less i get on a big road/interstate or suppin.
it will take right off and maintain its speed,as fast and easy as any car/truck iv driven(while not "acting out"-just driving).with 0% signs of the word "slow" or "sluggish" or anything like that even entering my mind.
however,iv not tried going up any hills at all.but with close to 200hp (should be over 200 with an open exhaust,based on how poor that factory setup looks) and over 350 trq,i would never guess them to be an issue while empty.i can't wait to find out.
i like hearing you claim 22mpg! very cool.
im hoping i can see 15-17 avg while working it.
(the 6.4 is poor! mpg = 13 avg.over the highway she will do 16/17 tho that's best max.but way overkill on power imho lol.i like it.but don't need what i can't/just wont be using.nor could i afford such a new 4x4 diesel rig such as this anyway.)

 

These things will spin out but they are heavy and when they hookup you get to know where theweak links are.

 

hahaha i bet.im glad i didn't really come on to her then.

 

I used to keep mine pretty loaded all the time this meant no playing but the few times I got on it I would get to repair something usually a driveline but a couple times it was the spider gears in the front.

 

hey,6500 pds empty for the cab and chassis? sweet! i weighed my dads rig at a transfer station and got 8400 pds just a single cab normal f350 2008 4x4 with dump bed insert(we know that weighs 700.)
these older ones are lighter than i thought then... cool!!!!

so does this mean the average rig like mine weighs around 6k in stock form (reg cab/4x4)?
if so,no wounder the thing can haul *** when empty then(thats heavy sure,but its also a whole freaking ton lighter than my dads rig!? where the heck is an extra 1 ton of steel? well,ok.- the 700 for the insert,but still!).

addition:
how much extra weight is that D60(just assuming thats what it is in his f350) he's carrying around in the front on the 1 ton compared to the D50 of the f250?
double addition lol: nevermind.you have the f350 too BlueOvalBud.so that's not it.
what the heck.

 

Mine was 6040 lbs empty when i got weighed at the scrapyard. Course mine is lighter than it was from the factory because of all the rust. LOL

 

Unless you visit several sets of scales, don't think that weight is accurate.
Scrap yards around here are notorious for inaccurate scales, strangely always on the lite side.

And gravel yards for some reason always seem to show heavy.

If you look at a 3/4 ton usually with a normal registered weight of 8800 pounds minus 1500 pounds of payload, 8800-1500=7300 pounds.

So I would figure the weight close to 7000 pounds empty.
Two wheel drive, a little lighter, 4x4 a little heavier.

The one ton, 9800 pounds - 2000 pounds = 7800 pounds.
The only real difference in weight is the front axle, and that is not 500 pounds heavier, but I do believe they have a bit more chance at actually being able to scale a legal 2000 pounds of payload.