The book is not a rebuild spec book it just more or less explains the differences between the 7.3 IDI and the 7.3 turbo IDI.

Sorry it is not for sale, I frequently gets asked questions about the older diesels and that book is nice to have around.

 

Hey Brian 460,

Maybe you can answer this. The stock turbo on a 7.3 IDI, albeit small, is able to produce more boost right? If you disconnect the wastegate and let it run full boost will i notice any difference or is it pretty much maxed out in its capability right now? If it will produce more, how much more HP and TQ can i expect from it and how much more boost can you get out of it? Do these engines respond well to this or no?

Thanks

 

Gator,
the factory system was limited to the power it could produce. I believe it was in the design of the turbine housing. There are aftermarket systems that will produce more h.p. and torque. The wastegate controller is adjustable, but you have to be careful while adjusting it.
the engines do respond to the addition of the turbo systems. Probably around 20 - 25% increase of h.p. and 32-37% torque increase. Be sure to install guages and a bigger exhaust system.

 

click here for a graph of 6.9 and 7.3 engines, both N/A, and epuipped with Hypermax turbos. that should give you a comparison between the 2 engines.

as far as manuals, go to Autozone and pick up the Haynes manual for diesels. it includes lots of good info on the 6.9 and 7.3 IDI, early PSD, as well as the GM 6.2 and 6.5 diesels. it's a good reference for the cost.

ROB

 

Ok, my dad says i can have his old '86 F250 6.9L 2wd Longbed truck. I love trubos, and i have owned a quite a few. All gasoline. The only advantage I can see to it being diesel is that it cannot be ran too lean. I want to either single turbo it, which i probably won't. OR, I will Tri-turbo it. Judging from the underhood space, it will be quite easy. I want to push upwards of 80 PSI boost. It will be intercooled as well. I plan on using the intercooler off a Mitsubishi Fuso Cargo truck. The Tri-Turbo system consistes of 3 turbos, FIRST, set up as if it were twin turbo, for extreme low end grunt, with wastegates opening at 30~ PSI. These turbos will more than likely be garrett T-50 series turbos, or KKK K36's (liquid cooled, and oil fed). Externally gated for optimal spool, and boost control. SECOND, The exhaust, and wastegate runners will run up to the third turbo, being of the T80+ size from Garrett(liquid cooled, and oil fed). At the RPM when the first two turbos are spooled up, and pushing full bost, the third turbo should be fully spooled, and ready to boost. I plan to run 2.5" exhaust from the #1 and #2 turbos to #3, and 1.75" from #1 and #2 wastegates (most pipe ran under the motor, and all equal "eyeballed" length, and Mandrel bent for best airflow.). Off the #3 turbo, it will have 4"+ exhaust (mandrel bent also). Of course, it will have new STEEL headgaskets installed, and ARP studs snugging everything together. As for the intercooler, the end tanks are getting re welded (tig, aluminum) to support the tri Inlets, and the outlet is getting opened up so it doesnt explode. The inlets should be 2.25"-2.5", and the outlet should be at 3", all aluminum.

Please feel free to question this if yah dont get it.... I will have pictures of the process to post on here when it is all in line. I give it 3 months before I can start assembly.

Jay- Turbo Junkie

 

I don't think a 6.9 can take 30psi of much much less 80psi that is ridiculous. I saw a highly modified race only cummins that was only running 45psi.

 

Ok, well my first idea was tandem turbo it, but that doesn't help low end torque. I'll try it anyways, and get back with you all on it. I think the 6.9 has some big potential.

 

Good luck remember this motor allready has 21+to 1 comp ratio

 

beening a new user to this.I can only say that finding a 6.9 under100,000 is not easy and I have been looking for 2yrs.I have been putting a 86 F-250 with auto and 4x4 to together.I keep getting told that 86 was the last year for 6.9&c-6 together,and the 7.3 will not bolt up to it.No I don't want to drop a stick into it.I could use some help.THANKS

 

There is no differences externally between the two engines a 6.9 will bolt directly in place of a 7.3 and vice-versa with no modifactions at all.

As for the C-6 it came behind the 7.3's and 460's at least until '91.

 

Just out of curiousity, how much was that "junk-yard" enjine of yours? (Im interested in doing a project)

 

I have a reman 6.9L shortblock for sale if your interested. Email me at oostroones(No Email Addresses In Posts!) if your interested. Never been used. Just sitting here taking up space.

 

http://www.intellidog.com/dieselmann/power.htm
The turbo 7.3 idi made 388lb ft. I have put some miles on one and think quite highly of it.

 

Latkins8, But the C6 is in a different housing from 460 to diesel. The gas C6 will not bolt up to a diesel, the bolt pattern is different. C6 out of 6.9 IDI will bolt up to a 7.3 IDI.

Brian460, The 7.3 and 6.9 are identical externally except the glow plug system is different.

F350Alligator, The torque difference in the 6.9 turbo and 7.3 turbo is almost 40 ft. lbs. The 6.9 also has 7/16" head bolts, the 7.3 has 1/2".

The problem with the 7.3 factory turbo was the small exhaust pipe and the downpipe flange on the turbo. ATS used to be able to get a better flange (3") for the factory turbo, have not seen just the flange for a while. The stock turbo was an ATS system that Ford re-engineered because there was not enough room for a three inch downpipe between the cab and motor block. So the installed a funky flange out of the turbo and a 2.25" down pipe that is all bent up to clear the cab. To put the three inch downpipe on you have to flatten out a cab seam and use strange vocabulary words.
I installed a two inch body lift which made the three inch downpipe have lots of room to go in. I am running 15 pounds of boost. I also think the Ford HP and torque ratings are very conservative for the IDI turbo motor. They wanted to sell everyone on the more expensive Power Stroke. The 7.3 turbo I just bought from Reviva had a dyno test sheet with it from when it was test run. 215 HP @ 3100 and 420 ft lbs @ 1850
Since the rings are now just seated and the clearances are starting to loosen up at 1200 miles I would estimate the power is up another 15 or 20 % over what it was when it was first installed.

The wastegate will keep you from blowing the heads off or head gaskets out when you are running 3000 RPM and let off the fuel and get back in it.

Simplebutton, get a three or 4 inch exhaust and put it behind an ATS turbo, only one of them. The 7/16 head bolts will not stand any more than about 15 pounds of boost.

A NA 6.9 is 154 HP and 280 ft lbs torque
A turbo 6.9 is 185 HP and 336 ft lbs torque
A NA 7.3 is 180 HP and 330 ft lbs torque
A turbo 7.3 is 195 HP and 380 ft lbs torque

Exhaust configuration, fuel cetane value and altitude can affect the above numbers by plus or minus 15%

Figures from Reviva which is a Ford reman plant.

 

Actually there is a plate bolted to the back of the 6.9/7.3 that adapts it to the 460 bellhousing pattern. Although I am not sure if the gear ratio's are the same with the automatics. I know the gas ZF 5-speed had a lower first gear than the diesel ZF 5-speed.

I know the diesel 5-speed will bolt directly to a 460 but, you have to drill and tap the bellhousing for the starter.

There was no Ford "factory" 6.9 turbo motor.