the mileage right now sucks pretty bad...went from 15 to 9 MPG...im trying to figure out if ford ever made a pre OBD II mass air on a 300...Mass air conversion is the only way I can think of to get my mileage back under light cruising speeds with no boost...PS that post above is an old post...I yanked it from a different forum...
Have you thought about a piggyback fuel computer? You would have to figure out how to hook it up yourself, but that is definitely doable. Or, my other idea is a rising rate fuel pressure regulator, then you MIGHT be able to stay with stock injectors. I have been thinking about doing this for a while, I glad to hear that turbo works nicely, I would have thought it would be to big.
the piggy back is an option but i am not too computer savy . my truck runs well with the fmu at about 6 lbs. and i think with a better fuel pump and little fmu tweaking i could up boost to 8 or 9 lbs max which is as high as i care to take it for what i want from it. this truck pulls a mountain grade effortlessly in overdrive without running hot or detonation. still trying to part with a few bucks to buy a good wide band air fuel ratio set up which is a must to get it set ip just right
the piggy back is an option but i am not too computer savy . my truck runs well with the fmu at about 6 lbs. and i think with a better fuel pump and little fmu tweaking i could up boost to 8 or 9 lbs max which is as high as i care to take it for what i want from it. this truck pulls a mountain grade effortlessly in overdrive without running hot or detonation. still trying to part with a few bucks to buy a good wide band air fuel ratio set up which is a must to get it set ip just right
Where is the thread for your truck? I have an 89 F250 and I have been toying with a Cummins swap. WHat kind of gas milage are you getting?
i want to pull the 400m and c6 in my 78 f250 4x4 and swap in a turbo 300 with a aod, my biggest qestion is the computor, what all do i need, i have read this 3 times and still cannot figure out what i need. i want to run off of 100% e85. how do i hook up the computors, i am going to mach it up in my barn, then spen a weekend or 2 swaping it in but i want minimum down time, i want to use an efi setup
I have always thought ford should offer a truck service turbocharged 300 in thier f250-f550 trucks as an alternative to an expensive high maintinance diesel. 500ftlbs would be so easy to achieve without all the emissions headaches and high doller injection system BS. Not to mention it is a way better truck motor than the 5.4.
My guess would be to find a late 80's donor truck with the 4.9 and the AOD and swap the complete unit and computer over to the '78. In the process fab the turbo setup shown here in this thread. The original poster doesn't come in here anymore and the only other person whose done this is turbo bricklayer and you never hear from him either. Remember that Ford didn't produce this setup (w/ turbo) so downtime will depend on your fab skills. You'd probably want to rebuild the 300-6 in the process to get some reliability.
I'm not sure the 300-6 is compatible with 100% E85 I could be wrong because Ford stopped making these in '95~'96. (kind of forget when exactly)
Grey TB doesn't have a cummins this thread is about using a 6.5 chebby turbo on the 300-6
I know he doesnt have a cummins. I was saying I was weighing the options of 6bt vs 4bt vs Turbo the 300-6 thats allreayd there. I was asking what kind of milage he is getting now with his setup. I read a few pages back he was get 9-10 and I was wondering if it had imporved. Thanks though.
Well it's all back together again with some new wiseco slugs and total seal gapless rings. I wasn't able to put the cam in that I wanted. I would have had to get more machine work done on the head to fit the cam and I ran out of time on the assembly and install. (had to get it running in 4 days) I've got the boost sitting at a nice 8lbs. and getting about 15 mpg on the highway. So the next plan when I get more time and money will be to throw the cam at it and see how it responds, but for now I will enjoy my reliable 8lbs. and good mileage. here are some pics before the head went on.http://www.ford-trucks.com/user_gall...id=149357&.jpg http://www.ford-trucks.com/user_gall...id=149358&.jpg http://www.ford-trucks.com/user_gall...id=149359&.jpg
Now remember his truck has a 4-speed manual w/ the granny low (no OD). That's not bad considering my '92 w/ the E4OD gets 16~17 mpg highway. I'd give up 1~2 mpg to do this but I've got to finish a few things first, always the way it seems.
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