7.3 l Ford question April 12, 2011 03:45AM
This is for all of the Ford experts--what kind of boost can I expect from the turboed 97 Ford F-350 dually with the 7.3 liter when just motoring down the road and when towing a trailer? Does an inefficient turbo cause poor mileage? Thanks. JW
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Re: 7.3 l Ford question April 13, 2011 12:15PM
have you had the truck long?did it use to get better then fall off or did you just get it and think it should get better?there is alot of thinks that hert fuei milage.
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Re: 7.3 l Ford question April 14, 2011 02:44AM
Got it before last season. Put a 4" exhaust on it, added new injectors, and programmed. Performance actually seemed to fall down. Thinking about putting a 3.73 ring and pinion in place of the 4.10. I use it 95% of the time to tow trailer with on the highway. Don't ever see any black smoke out the exhaust nor do I ever hear the turbo when turning off motor. The turbo is spinning but when t'ing in a pressure guage don't get any reading (did this weekend when power braking--got about 4 lbs of boost at 2000 RPM--only powewr braked to put load on motor, not trrying to do burn out or anything--just trying to see if turbo adds any boost) A lot of guys on here have loads of experience with diesels. I have none. JW
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Re: 7.3 l Ford question April 14, 2011 04:04AM
If you want to ask to a bunch of 7.3 guys, check out Powerstroke Nation Those guys live for questions like these.

When I'm running mine down the road 70mph, I'm seeing around 6-7psi, max I see right now (stock) is about 20. When I was running it chipped, 25psi max.



Edited 1 time(s). Last edit at 04/14/2011 04:05AM by RYAN68.
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Re: 7.3 l Ford question transmissons shifts a little hard April 15, 2011 02:25PM
Thinking of buying a 1996 F250 7.3,but transmisson shifts a little hard what could this be.Should i purchase the truck is this something that could be fixed without a hole lot of expense.
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Re: 7.3 l Ford question April 14, 2011 05:48AM
my truck is alittle newer '99 with air to air cooler. running 60mph empty down the road it only has bout 2-4 lbs boost. loaded down the road with chip on it will hit bout 20lbs
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Re: 7.3 l Ford question April 14, 2011 07:40AM
Running down the road with a trailer it runs any where from 10 to 22 lbs depending on the load, and sitting idleing it has a high pitched whine. Sounds like you have problems.
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Re: 7.3 l Ford question April 14, 2011 12:16PM
I got a 97. Stroker. .don't know how much boost pressure its got. Fuel milage never above16mpg. We haul goosneck an tractors on it.pulled 8% grade for 7 to 8 miles with tractors on trailer. Have a superchip program in it straight pipe on it. Did you install factory set inj? If oversize check with Deisel shop an see if you need to install bigger huie pump to make sure you inj have enuff oil pressure to pop off.check you waste gate, maybe closed,wont build boost. Run the codes for ebp sender which operates waste gate. Codes maybe. Listed as. Po470- po478. I have mine bypassed.I have 4:10 2 nd trans.258.000 miles. You find out that 94 an newer be hard to make them smoke without over riding program or add some parts.mine smoke till it quits laborin my turbo zings with a tip on exhaust. Turns heads when u drive by .If you ain't herin a turbo be pullin intake pipe an exhaust pipe see if u still got agot wheel in ther lol. Hope this helps ya
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Re: 7.3 l Ford question April 14, 2011 11:33AM
I have a 97 f250 w/banks turbo down pipe and an edge programer truck has 5 speed manual with 410 ratio running empty i run 4-5
lbs boost pulling trailer down flat road at 70 will pull about 8-10 lbs of boost max'd out i've gotten to about 20-22 lbs boost I baught
the truck w/45000 miles now has 155000 has always run the same boost and i never hear the turbo but i cant hear high pitched noise
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Re: 7.3 l Ford question April 14, 2011 01:49PM
I have a 97 f250 with 278,000 miles on it,,,, she has been to louisville this year,,, she runs like a new one
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Re: 7.3 l Ford question April 14, 2011 11:29PM
We have a 97 stroker with 170,000mi 17mpg. Good power even for stock. Turbo whistles like a jet out exhaust with noticeable whistle from intake side. 2-3 psi driving, around 20 psi hard pull. No wastegate on these trucks just warmup valve that sometimes sticks hurting performance. Unplug wire from turbo pedestal is quick fix. Depending on your mi your HPOP could weak, might just need IPR valve changed. Also check your codes, truck could be defueling, had this problem with my 02. Good luck
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Re: 7.3 l Ford question April 15, 2011 07:14AM
Thank you all for the info. My truck fits the general descriptions you alll have as far as mileage, etc. Sounds like I might have to pull the turbo because I am not getting anywhere near the mileage (maybe 10 tops towing or empty), don't hear no turbo, etc. JW
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Re: 7.3 l Ford question April 15, 2011 07:16AM
What is the HPOP? And the IPR valve? I know nothing about diesels--just that they are noisy, smokey, and heavy!!! LOL!!! JW
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Re: 7.3 l Ford question April 15, 2011 08:23AM
hpop is high pressure oil pump. Those Powerstrokes used high pressure oil to push the fuel through the valve instead of high pressure fuel (fuel pressure runs <60 psi on these, oil pressure up around 3000 psi). The IPR is the injection pressure regulator which is located in the high pressure oil pump. It controls the pressure your pump puts out. An underperforming fuel or hpop can have dramatic effects on how well your truck runs. Same with the turbo.
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Re: 7.3 l Ford question April 15, 2011 09:09AM
I know this is going to seem silly but has anyone taken the time to inspect the exhaust pipe, I have had the muffler and catalytic converter both to come apart and until someone cleans the pipes out milage and power are terribly compromised.
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Re: 7.3 l Ford question April 18, 2011 04:23AM
It was a new 4" system from turbo on back. Those are a treat to get the downpipe in that little area. I won't name the diesel shop in Indiana that put in the new injectors (not Scheid's). I am assuming that if it needed a new pump they would have done that too. Can't, actually won't, go back there as they busted the dually fender but wouldn't admit to it. It is just exasperating that I hear of these good things about the 7.3 and I got on that is not so good. JW
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Re: 7.3 l Ford question April 15, 2011 11:02AM
do you have any exhaust manifold leaks?
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Re: 7.3 l Ford question April 15, 2011 11:53AM
Pull exhaust off at the down pipe and see if you can here the turbo. If you can you have a
plugged converter. You can unplug the map sensor. located on the fire wall and see
what changes.
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Re:1993 7.3 l Ford question April 17, 2011 02:35AM
I have a F350 7.3 natural aspirated truck has 83,000 miles on it. Runs great just lacks power SOMETIMES Any ideas??? and yes fuel and air filters are clean lookin to make more power. Have considerd a turbo but looking to stay away from that. Maybe it nees a charger letme know what you guys think thanks



Edited 1 time(s). Last edit at 04/17/2011 04:23AM by Hotsmallblock.
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Re: Re:1993 7.3 l Ford question April 17, 2011 07:40AM
I have a 85 with a 6.9 that we put a charger off a 7.3 on it, and turned the pump up slightly. mileage is 16 empty, 10 to 12 with a trailer. The power is amazing, its actually hard on the clutch now, and it will shorter the life of it a little with the higher compression. Sure pulls the hills now.
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Re: Re:1993 7.3 l Ford question April 17, 2011 08:01AM
How much did you have invesed in that? How big of a job was it putting it on?
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Re: Re:1993 7.3 l Ford question April 17, 2011 01:00PM
If its a 93 it should be a IDI motor I think, Don't remember when the switch to the powerstroke was?? Anyway I found a 7.3 IDI that had a rod out of it and bought the turbo manifolds valve covers air cleaner and down pipe for 800.00 and everything bolted on in an afternoon. Then take the cover off the side of the injection pump and turn the motor over until the hole in the ring lines up, take an allen wrench and turn it clockwise a eighth to a quarter of a turn put the cover back and your done.
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Re: Re:1993 7.3 l Ford question April 17, 2011 04:29PM
the switch to powerstroke was half way thru 94 production year the early 94's were natural asp. the late 94's were turbo charged
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Re: Re:1993 7.3 l Ford question April 18, 2011 12:50AM
Almost...all '94's had a turbo. But halfway through the '94 model year, all trucks with 5 speeds had the Power Stroke, but were still badged as just a turbo diesel.
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Re: 7.3 l Ford question April 15, 2011 04:01PM
How did it run before the upgrades, if it ran ok I would say something went wrong on the install or faulty parts. If it starts good i would not think its the hpop or the ipr, and if you dont see smoke i would not think it was turbo. No smoke is lack of fuel, which in turn will not build boost. Test fuel pressure, with a programmer and injectors that should bellow black smoke, or try a different programmer or go back to stock. Make sure the map sensor is hooked up properly. Let me know what you find, i am a master diesel ford tech, and this problem has me intrigued
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Re: 7.3 l Ford question April 17, 2011 02:05AM
Well, I have '99 Superduty diesel 4x4 with Superchips and big airfilter box out of 2004 Superduty diesel , running at 22 mpg on the highway and 18 mpg on the backroad. It was best diesel truck I will ever own. Can't beat the 7.3 diesel, Ford screw it up by letting it go.
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