big block turbo sizing

foxbodydave

foxbodydave

Club Member
ive recently aquired a free complete 460 out of a 70's truck. i wanna try my hand in the turbo arena next year and im curious as to what size turbo would be sized right for the motor. i would keep the stock crank and rods, and put forged pistons in it as well as a cam. id like to be at about 800 hp and the same for tq....also what size carb would be needed.
 
s400 borg warner with a big hotside.Would make a bit more power with the 80mm upgrade but the box stock s400 is plenty capable as well. It will be a short early power curve in the 5600rpm range using such a small compressor.
 
i have been lookin on there for a couple days now. i thought i remember reading how the stock rods were really strong as well as the crank. i wanna do it right the 1st time so i guess it would be cheap insurance
MavisBeacon said:
If your considering trying to make 800 hp, you really should look into upgrading the stock rods. Also, if you haven't already check out www.460ford.com There is a lot of useful information there.
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Buy the biggest one you can find in your price range. That's a big motor to only try to make 800 hp with...
 
i would go with at LEAST the S488 which is an 88mm, the 460 is going to move ALOT of air and i dont think the 80mm will be efficient enough..

just my .02
 
Well if you read up on turbo's you are supposed to look at the exhaust air exiting the engine at a certain rpm (can be calculated) and compare the turbo map to see if it is within the ideal airflow range for that housing. It will at least tell you if you are close with a certain turbo or not. It's good that you have a HP target as that is what starts many of the calculations.

You can read Maximum Boost by Corky Bell and it has good basic info for learning all that stuff. I would post the formulas but that book is at home.
 
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Volumetric efficiency and RPM factor in heavily. for a low rpm motor you may want entirely different things vs a higher rpm engine. Also certain turbos may easily max out the potential of parts IE a stock block.

while a 106mm turbo would be absolutely baddass on a 514 BBF a stock block can;t take that much power.


Hugger Z said:
Well if you read up on turbo's you are supposed to look at the exhaust air exiting the engine at a certain rpm (can be calculated) and compare the turbo map to see if it is within the ideal airflow range for that housing. It will at least tell you if you are close with a certain turbo or not. It's good that you have a HP target as that is what starts many of the calculations.

You can read Maximum Boost by Corky Bell and it has good basic info for learning all that stuff. I would post the formulas but that book is at home.
Click to expand...
 
isnt a stock 460 block good till around 1000 hp?

while a 106mm turbo would be absolutely baddass on a 514 BBF a stock block can;t take that much power.[/QUOTE]
 
106 would be well over 1000hp in the correct setup. I'd start with two powerstroke turbos or hx35's. It should net plenty of power!
 
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