ok i have found a turbo unit for sale from a 99 powerstroke. on my truck i have the banks sidewinder kit. its a 92 7.3 . do you think the powerstroke turbo would be any better. Just curious. now i know that i would have do do a lot of modding but turbo vs turbo which would be better.

 

I think the powerstroke turbo is intended to put out over 35 psi of boost, but the IDI diesels can't easily take muck more than 15 psi without being built up. Some one did once put a powerstroke turbo on a 6.9 though, I don't recall how well it really worked. You may be able to find that thread if you do a search.

 

With a stock IDI engine the Power Stroke turbo could produce more boost.
But the head bolts on a stock engine could not handle the extra boost.

If your Banks turbo is a wastegated model, the wastegate can be adjusted to higher boost levels.
The boost level is set at the factory to protect the head gaskets, not optimum performance.

Also remember the Power Stroke engine has a base compression ratio of 18 to 1.
The 7.3 IDI engine has a base compression ratio of 21.5 to 1.
That small 3.5 points of base compression ratio difference makes a huge difference when the boost levels get into the 20's.

A Power Stroke running 30 PSI boost has an effective compression ratio of 54.7 to 1.
To see the same final compression ratio on a 7.3 IDI you only need 22.7 pounds of boost.

When I diid my 6.9 the base compression was 22.5 to 1.
I used head studs, milled the pistons down to lower the compression ratio to 20.25 to 1 and can run 25 pounds of boost before I exceed the 54.7 to 1 compression ratio of a Power Stroke engine.
30 PSI would still put me in the 61.75 to 1 range.

Head studs would be required to even think about running compression ratios that high.

That Power Stroke turbo was installed on a 7.3....I do not remember the user name right now though.

 

Why try and re-invent the wheel when the turbo you already have was designed for your engine?

 

Why are head studs better than bolts?

 

well that does give me a lot of info. Iprobably wont even get the turbo but its always fun thinking of it. Plus its only 200 bucks. Anyways my banks turbo does have a wastegate on it so if you want to tell me how to adjust it or the pros and cons about it that'd be cool how many pounds can i boost until i need to add studs do you think. also how about egt...will that be affected much with more boost it only peaks at about 900 deg. and only about 9-10 psi at most. also thermocouple is located on exhaust manifold before turbo

 

The head studs are better because the of the extra strength, as in harder to stretch.
Granted the studs are available in several yield strengths, the ones I used are 220,000 pounds.

I normally would say about 15 PSI is max, but I ran that much on a 6.9.
When I tore the engine down the fire ring on every cylinder was seeping and had been damaged.
The head bolts on a 7.3 are slightly stronger than they are on a 6.9.
The 7.3 uses 1/2" headbolts, the 6.9 uses 7/16" head bolts.

The downside of to much boost is blown head gaskets.



This is an ATS turbo.
The orange circle shows the wastegate adjustment location, make the rod shorter to increase boost.
Ford staked most of the wastegate rods, you have to take the rod apart and retap the female end before you can adjust it shorter.
ATS units were usually not staked.
Banks I have no experience with.
The rod that goes into the wastegate chamber must not be allowed to turn, if you do the diaphram will be torn and the wastegate must be replaced.

Before you go through all that, boost is a product of fuel, RPM, intake restriction and exhaust restriction.
More fuel and more RPM = more boost
Less intake restriction and less exhaust restriction = more boost
More heat in the exhaust to the turbo = more boost, I have every pipe from the manifolds to the turbo wrapped with a double layer of header wrap to keep the heat in the exhaust till it goes through the turbo

Things to look at that affect boost.
Clean air filter = less restriction
Ram air = less restriction, positive pressure to the turbo results in faster spool up
3" minimum exhaust diameter = less restriction = faster and higher boost
Free flowing or no muffler = less exhaust restriction = faster and higher boost
Do you see any black smoke from the exhaust under normal driving conditions?
Do you see any black smoke when you have the loud pedal on the floor pulling a hill?
900 degrees max EGT tells me that you see no black smoke or you have an intake or exhaust problem

When tuned for power a turbocharged diesel will have a very light black smoke from the exhaust, that means it is getting just a slight bit more fuel than it has air to burn the fuel.

Hope this all still makes sense, I went back and added several lines as after thoughts.

 

i will look at the wastegate rod to familiarize myself with that. probably wont mess with it just yet. As far as black smoke...none, unless its at night and a car is behind me, then i can just slightly see some sort of smoke. Of course i cant tell what color it is. with pedal stabbed going up a long hill, egt will slowly climb to 900deg at most and usually only about 9lbs of boost. I know i need to make a ram air setup to get cold air into the filter. now the filter just sucks hot engine air because there's nothing that closes the filter in, and also the original snorkel that goes from above radiator to stock air cleaner is missing.thats how it was when i bought it.once i get a digital camera i will load pictures to give people a better idea of what im working with. thanks for any info and please continue. need food for the brain

 

Sounds like your IP needs 1 more flat of fuel internally or 1/2 turn out on the external torque screw if you have a DB2-5028 IP.

 

dont know if i have the db2 ip. did those come stock? I am familiar with turning the allen screw somewhat and i may try that. UPDATE-Idid shorten the rod on my wastegate about 1/4 inch by adjusting the threaded portion of the rod. Low and behold boost goes up to 11lbs...pretty quick too. I can now powerbrake if i try. Also is there any formula that will tell you how many horsepower or torque 1 lb of boost will get you? Im thinking no just because there are so many variables that may change how much boost is being put out.

 

They were all DB2 pumps, the numbers after DB2 tell which pump it is.
5028 was what was normally on a 92 7.3 with an automatic tranny.
5013 was on a 92 with a manual tranny.

 

well i do have an automatic, so if i have the db 5028 than is it easier to adjust? Or is this just another adjustment that can also be made. anyways if so let me know.