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Discussion Starter #1
I have a turbo off a 2002 7.3, what kind of boost numbers does it make.
 

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well you can get it to boost up to around 35 psi, where they are happiest and most efficent depends on what 7.3 it came off of... van or truck.

oh and what boost you see depends on what you're going to use it on a tubo does not magically give you X amount of boost. you have to supply the energy from the exhaust to generate the boost.
 

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and a restriction or there is no boost, as boost is nothing more then a measurement of restriction
 

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Discussion Starter #5
thanks for the info, the turbo came of a truck when it was new in 02. was curious about wether it was too big for a small block gas engine
 

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Discussion Starter #7
Ok went to ford its off a 97 and down 7.3. cinse the turbine is 1.15 it wont start building boost till about 3000 rpm because of lack of exaust pressure; gotta go down to a .84 housing and boost will come on at about 1500-1800. By the way 7.3 comes to 444 cubes if it will supply enough compressed air for that I dont think it will have a problem with a small block. My .02:)
 

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Lack of exhaust pressure? It's lack of volume out of the engine, which is what creates drive pressure. Man... You need to educate yourself...
I highly suggest picking up Maximum Boost by Corky Bell, Turbochargers by Hugh McInnes is another good read.

While turbo is probably plenty big for your small block, just because it makes x amount of boost on a 444" diesel means it'll make Y amount on your small block. Boost is a measure of the amount of air the turbo flows in excess of what the engine would n/a....
 

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lets start with what is the turbo?
Ummm. . . . . . . . . .yep!

My book of reference is "Street Turbocharging" written by "Mark Warner"

A smaller turbine housing will not work with the old turbine wheel. you need to swap em both. But my gut feeling is that turbo should be fine with a BB gas engine of the similar size. But you need to swap the W/G for a lower boost level best souted for a gas engine. I don't think a BB gasser would like 35 pounds shoved down its pipe:shaking: Average boost pressure on a gasser is 8 pounds with a maximum of around 20 pounds on a built to the hilt bottom end.

Go buy a book, do some reading, do some math, do more math again then build it.
 

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and a restriction or there is no boost, as boost is nothing more then a measurement of restriction
Gotta also remember about the thermal efficiency and how it relates to building boost. But im sure you know about that. Just wanted to put that out there as well.
 

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Discussion Starter #12
in saying pressure I meant volume, and I realize that it may not work. And the kicker is I have a Impco 425 carb and E mixer. I seen where a 22re toyota turbocharged propane I want to try it on a grander scale. dont know for if it will work either.
 

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that turbo is a garret tp 38. on a 444" powerstoke that turbo is all done making "good" air by 3000rpm. a 302" engine would be moving the same volume of air at 4400 rpm, at which point you would reach the limit of the turbo. yes you could push the turbo beyond that point, but you will be heating the air too much and overspeeding the turbo. too hot intake temps greatly increase the chance of detonation, which when turbocharging can kill an engine before you can lift your foot off the throttle. this turbo on a small v8 would have great throttle response though.

try to avoid sizing a turbo based on how much boost it can produce, but rather how much volume that it will flow.

being off of a 97 or earlier PS it is not going to have an internal wastgate, so you would have to add an external gate.

how about giving us some background info on what you are trying to build.
engine specs and intended usage.

there are many good deals to be had on quality turbos that are the right size for whatever you want to do, making the use of the PS turbo (just because you have it or it was really cheap) substantially less appealling.
 

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try it and let us know how it works. you never know depending on your combo it may work for you. i t would be cool if it works.
 

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handy that they use a 302 as their example so we can rob the numbers without having to think
http://www.theturboforums.com/turbotech/main.htm#selectcompressor

assuming the chart matches the turbo (and nothing says it does until you find out exactly what the turbo is), and a ton of other things :)

10psi is 1.69pr, call it 1.7 on the chart
we can rob the 42lbs/min as the top of the chart
the line is right in fat city of the map
 

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handy that they use a 302 as their example so we can rob the numbers without having to think
http://www.theturboforums.com/turbotech/main.htm#selectcompressor

assuming the chart matches the turbo (and nothing says it does until you find out exactly what the turbo is), and a ton of other things :)

10psi is 1.69pr, call it 1.7 on the chart
we can rob the 42lbs/min as the top of the chart
the line is right in fat city of the map
But its all in the builders knowledge to do the math and find the best match up. All dependence on the PR they run. When I did my system, I engineered mine at a 1.63 PR. But the actuall performance at mid range RPM was sitten around 1.5 PR. But at 4500 rpm, my PR jumped to 1.65. Basically, the A/R of my turbine is slightly too large. But my idea is, when I stroke my motor, I should be tits perfect. This is just an example.
 

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Discussion Starter #18
thanks mj that turbo forum is a good read, I fully get that I gotta do alot of math but understand this will be a timex not a rolex and I promise I will do as much research as I can in order to get it as close as I can. I am still looking for info on turbocharging propane which will be even harder, any help would be appreciated thanks guys.
 

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my project is 400m, mpT70, intercooled, impco 425, model E
when you get there we can share trials and errors
all I need to fire it is the crossover pipe and the cold side piping, the hard parts are all made


 

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my project is 400m, mpT70, intercooled, impco 425, model E
when you get there we can share trials and errors
all I need to fire it is the crossover pipe and the cold side piping, the hard parts are all made


You got a detail build thread MJ? Would love to read it. My turbo thread is in my Signature. But I know you've already read it.
 
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