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Old July 5th, 2010, 03:38 PM   #1
bjkttr
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Default adding a turbo

I have a f250 with a 390 with the following
390 .030 over flat top forged pistons
2. balanced crank and rods
3. 428 heads ported and polished intake and exhaust ports
4. ported intake to match the gaskets.
5. .512 lift 292 duration comp cam.
6. 750cfm edelbrock carb

I am thinking of adding a turbo. What other mods will I have to make so that I don't cause any damage to the engine. And what kind of turbo every one would recommend.
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Old July 5th, 2010, 03:41 PM   #2
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i would get the best exhaust valves you can buy. i was looking into putting twin turbos on my 65 buick skylark a while back and that was the number one thing that everybody told me!
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Old July 5th, 2010, 03:45 PM   #3
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I like the idea and have been throwing it around in my head to do a twin turbo setup on my 5.7l

sorry I don't have any info to help, just wanted to get in on the thread so I can find it later

Good luck
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Old July 5th, 2010, 04:03 PM   #4
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stud the heads if you haven't done it yet
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Old July 5th, 2010, 04:18 PM   #5
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How much boost do you plan on running?

What is the compression ratio?

How is your fuel delivery system?
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Old July 5th, 2010, 04:24 PM   #6
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It really depends on what boost levels you are planning on running. Any decent motor can run on a 5psi boost, they already are at 14.7 anyway just from the atmosphere. Pick up a copy of 'Maximum Boost' by Corky Bell, that will tell you just about everything you want to know
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Old July 5th, 2010, 04:30 PM   #7
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You might also want to look into a pro-charger system as well, which is basically a belt driven turbo.
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Old July 5th, 2010, 04:34 PM   #8
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Quote:
Originally Posted by Motorcitydak View Post
they already are at 14.7 anyway just from the atmosphere.
ya it is at 14.7+- but it is the same on the outside of the motor so it doesnt actually have 14.7 lbs of pressure differential.
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Old July 5th, 2010, 11:00 PM   #9
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You will need to know what compression you have first. If its 10.0-1 or higher you might be better off looking into dropping compression first.

The cam has to much duration for a turbo setup. You want less duration and very little over lap to prevent blowing your boost right out past the open exhaust valve. Wide LSA numbers in the 112 min to around 117 work best.

I have never seen anybody get one of those carbs to work on a turbo setup{or blow thru blower}. I would say swapping to a Holley built for blow thru is your best option.

You will need a dam good fuel system to make all of this live if you go thru with this. Do not skimp on a cheap or small fuel pump and a good boost referance regulator.
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Old July 6th, 2010, 10:05 PM   #10
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Default turbo

I just wanted to thank everyone for the advice. I think that I will wait for the next project to run a turbo. My wife keeps wanting to claim this truck anyways.
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