Turboed 300L6?
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From: Boise, Idaho
Sadly, the fact that you have an EFI engine is going to make your workload to turbo the engine increase by a hundred fold since you'll have to deal with making the computer happy. If it were carbureted, it's much much easier. However, that's not to say it can't be done. There's a guy on there that is running a 12 sec. 1/4 mile with his 77 pickup 300I6.
Keep in mind that it's going to be almost 100% custom work, there are no kits. However, the plus side is that there is a good amount of room around the 300, so you don't have to squeeze everything in.
Check out the tech info at www.fordsix.com under the Turbo/Supercharger/EFI Tech forum. Here's a direct link:
http://fordsix.com/forum/viewforum.php?f=22&sid=3e420c06a968fb85542691330a3 21102
Keep in mind that it's going to be almost 100% custom work, there are no kits. However, the plus side is that there is a good amount of room around the 300, so you don't have to squeeze everything in.
Check out the tech info at www.fordsix.com under the Turbo/Supercharger/EFI Tech forum. Here's a direct link:
http://fordsix.com/forum/viewforum.php?f=22&sid=3e420c06a968fb85542691330a3 21102
Last edited by AbandonedBronco; Jan 2, 2008 at 10:46 AM.
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From: Boise, Idaho
Easier? Why do you say that? I've looked into it quite a bit and I've heard that turboing a carb engine is just a matter of beefing up the engine, fabbing up a turbo setup, and tuning the carb to accommodate, whereas I've heard nothing else than turboing an EFI is a computer controlled nightmare.
Might be wrong, but wouldn't want to give false hope where it's not due.
Might be wrong, but wouldn't want to give false hope where it's not due.
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From: Broken Arrow, OK
Because it is easier. All of the fabrication is going to be roughly the same amount of effort for either one, the only difference will be the tuning. With the carb you've got to jack with everything on it to get it running right, and then do it again when the weather changes. With EFI all you have to do is install an FMU and you're done. It doesn't get any easier than that.
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Originally Posted by Silver Streak
Because it is easier. All of the fabrication is going to be roughly the same amount of effort for either one, the only difference will be the tuning. With the carb you've got to jack with everything on it to get it running right, and then do it again when the weather changes. With EFI all you have to do is install an FMU and you're done. It doesn't get any easier than that.
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From: Lathrop, MO
Originally Posted by Silver Streak
Because it is easier. All of the fabrication is going to be roughly the same amount of effort for either one, the only difference will be the tuning. With the carb you've got to jack with everything on it to get it running right, and then do it again when the weather changes. With EFI all you have to do is install an FMU and you're done. It doesn't get any easier than that.
Now if you know of someone that has cracked the 300 SD tables and has coding to adapt a 2 bar (or 3 bar if your looking for more than 15psi of boost) MAP sensor into the equation, then an FMU shouldn't even be needed. The problem there is that appearently the Ford SD code doesn't properly handle VE calc's that exceed something like 95%.
There are some aftermarket ECU's that might be able too be swapped. Like the latest one from Accel DFI that I read about last fall. But your looking at a minimum of $1200 for the ECU and harnesses.
But I've yet to find an example of someone just using an FMU and having a host of trouble that eventually killed the engine. YMMV
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From: Broken Arrow, OK
If you remember a thread from a few weeks ago you know that I am the first to say that the EFI 300 has some shortcomings for high boost. However, if you run modest boost, maybe 6-8 psi, I believe it is doable. You can buy an ingition box (like this one)with a build in boost retard and overcome the timing problems easily, which is something you would have to do on a carbed engine anyway. If I had to pick an engine for everyday driveability, durability and efficiency I would choose a well built naturally aspited 300 any day of the week and twice on Sunday. His question was how hard would it be, to which someone replied that carbed would be easier. I believe that is false because it is so easy to overcome the limitations of the computer.
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From: Lathrop, MO
Originally Posted by Silver Streak
If you remember a thread from a few weeks ago you know that I am the first to say that the EFI 300 has some shortcomings for high boost. However, if you run modest boost, maybe 6-8 psi, I believe it is doable. You can buy an ingition box (like this one)with a build in boost retard and overcome the timing problems easily, which is something you would have to do on a carbed engine anyway. If I had to pick an engine for everyday driveability, durability and efficiency I would choose a well built naturally aspited 300 any day of the week and twice on Sunday. His question was how hard would it be, to which someone replied that carbed would be easier. I believe that is false because it is so easy to overcome the limitations of the computer.
I'll agree that with a boost referenced FMU AND a boost referenced ignition controller you got a chance with low boost. Especially if you have wideband to help dial everything in.
My issue was with "With EFI all you have to do is install an FMU and you're done". I knew you'd left something out based on the previous discussions. I'd forgotten about boost referenced ignition modules, but knew that timing had to be addressed. Thanks for filling it in.
As too which is easier...that's ultimately a factor of which the builder is more comfortable and knowledgable.
Which for me both would be a learning experience. I've actually done more performance work on my Cummins (not that I've done much there either) than I have my 300. For that matter, I've done more performance related tweeking on gas turbines than recipricating.
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From: Broken Arrow, OK
For a weekend toy it could go either way. For something you need everyday I would go EFI because you don't have to do much tuning and once it's tuned you are done. With a carb you'll be jacking with it constantly.
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