turbocharged 300/six
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Freshman User
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From: Fort St. John
turbocharged 300/six
alot of people were wanting to see pictures of the turbo i am fitting onto my 79 F250 300/six i snapped one with my phone last night, it turned out horrible but its all i have for now. the build is alot easier than i thought it was gona be before i started. all i had to do was bring the flange up with the exhaust to where the turbo will meet the intake horn i made. plumb in the holley two barrel carb i bought with the boost controller run my water injection and oila. of course theres alot more to it than that but thats the jist of it.
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Freshman User
Joined: Nov 2009
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From: Fort St. John
update, turbo install done. works excellent, hits a wall at about 14 p.s.i, but thats more than enough in my opinion. off-road the truck gets froggy once you get over 5 p.s.i. which is saying alot for such a small low revving motor. dont judge, the pics are from my iphone.
Tuned
Joined: Mar 2010
Posts: 491
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My thoughts exactly. More prone to being problematic, carb icing, etc.
If you have the time/energy, you should really consider going to a blow-through setup!
~B
If you have the time/energy, you should really consider going to a blow-through setup!
~B
Tuned
Joined: Mar 2010
Posts: 491
Likes: 7
Yeah, don't get me wrong, I do like it. It's a slick, clean, simple setup. Just the wrong way 'round! 
I do think it's got a lot of potential! (Plus, anything Ford with a Turbo is WIN!)
If you live somewhere where there's not a lot of winter, you'll be fine - you just run the risk of icing up the carb from increased intake speeds.
Also - a draw through setup is easier to tune, because of the increased intake speeds mean the carb sucks in what it needs (assuming it was tuned right to begin with). A blow through is a little harder - you have stock-like flow velocities, but extra pressure.
Don't ever put an intercooler on a draw-through setup. When the fuel/air mixture passes through the intercooler and cools, the fuel will condense out of the air and puddle in the intercooler!
Either way - keep us posted how it runs, it's cool! If I weren't worried about cash, I would try and do something like I did on my v6 mustang - flipped headers and twin turbos
~Brad
I do think it's got a lot of potential! (Plus, anything Ford with a Turbo is WIN!)If you live somewhere where there's not a lot of winter, you'll be fine - you just run the risk of icing up the carb from increased intake speeds.
Also - a draw through setup is easier to tune, because of the increased intake speeds mean the carb sucks in what it needs (assuming it was tuned right to begin with). A blow through is a little harder - you have stock-like flow velocities, but extra pressure.
Don't ever put an intercooler on a draw-through setup. When the fuel/air mixture passes through the intercooler and cools, the fuel will condense out of the air and puddle in the intercooler!
Either way - keep us posted how it runs, it's cool! If I weren't worried about cash, I would try and do something like I did on my v6 mustang - flipped headers and twin turbos
~Brad
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Lead Driver
Joined: Mar 2010
Posts: 5,250
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From: West Virginia
the biggest reason to use blow through is for driveability. If you blow a pipe or spring a boost leak, you will still make it home with blow through.
I woudl definitely like to see a video of this thing though.
I woudl definitely like to see a video of this thing though.
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From: Western N.C.
I like it. I like it alot. Very cool upgrade and it looks very professional. 
As far as the location of the carb, I probably would have made it blow-through like the other guys said. Not because of carburetor icing, but because I would have doubts about the air/fuel mixture running through the compressor.
Then again, I would also have concerns about pressurizing the carb itself with a blow-through. That can't be good for gaskets.
One question I just have to ask...how will that affect anything that runs off of manifold or port vacuum...or will it? I would think that adding boost pressure would drop the negative pressure in the intake manifold and make anything plumbed into that cease to function...or at least function erratically. And vise-versa...if you are increasing the velocity of air traveling past the ports on the carb, wouldn't that produce excessive negative pressure and lead to the same result?
Also, did you have to install additional braces under the manifolds, or is the added weight not enough to worry about?
As far as the location of the carb, I probably would have made it blow-through like the other guys said. Not because of carburetor icing, but because I would have doubts about the air/fuel mixture running through the compressor.
Then again, I would also have concerns about pressurizing the carb itself with a blow-through. That can't be good for gaskets.
One question I just have to ask...how will that affect anything that runs off of manifold or port vacuum...or will it? I would think that adding boost pressure would drop the negative pressure in the intake manifold and make anything plumbed into that cease to function...or at least function erratically. And vise-versa...if you are increasing the velocity of air traveling past the ports on the carb, wouldn't that produce excessive negative pressure and lead to the same result?
Also, did you have to install additional braces under the manifolds, or is the added weight not enough to worry about?
Tuned
Joined: Mar 2010
Posts: 491
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As far as the location of the carb, I probably would have made it blow-through like the other guys said. Not because of carburetor icing, but because I would have doubts about the air/fuel mixture running through the compressor.
Then again, I would also have concerns about pressurizing the carb itself with a blow-through. That can't be good for gaskets.
One question I just have to ask...how will that affect anything that runs off of manifold or port vacuum...or will it? I would think that adding boost pressure would drop the negative pressure in the intake manifold and make anything plumbed into that cease to function...or at least function erratically. And vise-versa...if you are increasing the velocity of air traveling past the ports on the carb, wouldn't that produce excessive negative pressure and lead to the same result?
Then again, I would also have concerns about pressurizing the carb itself with a blow-through. That can't be good for gaskets.
One question I just have to ask...how will that affect anything that runs off of manifold or port vacuum...or will it? I would think that adding boost pressure would drop the negative pressure in the intake manifold and make anything plumbed into that cease to function...or at least function erratically. And vise-versa...if you are increasing the velocity of air traveling past the ports on the carb, wouldn't that produce excessive negative pressure and lead to the same result?
Gaskets also not an issue - low boost (less than 14psi) most gaskets are fine.
As for Vacuum, in blow-through setups it's not an issue since you still have the vacuum source (manifold) behind the butterflies. Shouldn't be an issue with the draw through either - close the throttle plate and the motor should still see vacuum. Only odd point will be that you'll get manifold pressure under WOT. Won't affect the important thing - brakes - because the vacuum accumulator on the Master cylinder should store up enough vacuum that a 15 second WOT run won't be enough time for it to bleed off all the vacuum.
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From: Fort St. John
i run my brakes vacuum line to one of the vacuum ports on the holley carb. no problems there. i've got about 300 kms on it now. pulling hills, engine braking down them, idling around trails. and it works seemlessly the only thing i need to do to improve is add a blow-off valve.
Tuned
Joined: Mar 2010
Posts: 491
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i run my brakes vacuum line to one of the vacuum ports on the holley carb. no problems there. i've got about 300 kms on it now. pulling hills, engine braking down them, idling around trails. and it works seemlessly the only thing i need to do to improve is add a blow-off valve.
If you have a draw through setup, you don't need a BOV
~Brad
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From: Fort St. John
Tuned
Joined: Mar 2010
Posts: 491
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If you've got a draw through setup, a BOV won't actually do you much good...as you close the throttle plates, there's no "surge" of pressure reverting back through the piping to hurt the turbocharger, like there is in a blow-through setup.
I feel ya brother