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Old 04-07-2015, 09:17 AM   #1
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Atmosphere and HP

So I came across this on a page:
One of the more common questions regarding turbo motors (well, any motor, for that matter) is, how much power will it make? This is an honest-enough question, and one that deserves a closer look. Perhaps the best way to attack this question is with an example. Suppose we have a stock modular Ford motor that produces 300 hp, and we want to know how much power it will make once we install our aftermarket turbo kit. The same calculations can be applied to determine the power potential at different boost levels (and help turbo selection) of any motor, so pay attention as the formula can be very useful. Suppose we add a turbo kit to our 300hp 4.6L motor and want to know how much power it should make. Before we can calculate the power potential of our newly turbocharged combination, we need to understand that our 4.6L is already operating under boost, or, more accurately, atmospheric pressure. Our normally aspirated mod motor operates with 14.7 psi of (atmospheric) pressure forcing the air into the cylinders when the valves open. This atmospheric pressure is a constant at sea level and a given temperature. Changes in altitude and temperature can naturally affect ultimate pressure.

If we all agree that the normally aspirated 300hp 4.6L is operating at an atmospheric pressure of 14.7 psi, then all we have to do to calculate the power potential of any turbocharged application is to multiply it by a percentage of the additional boost pressure. If we configured our turbo kit to supply 14.7 psi (1 BAR) of boost on top of the atmospheric pressure, theoretically our 300hp mill should produce 600 hp (2 x 300). This same formula can also be used to calculate different boost levels. If we run only 10 psi, then our mod motor would produce (10/14.7 or 0.68 +1 x 300) 504 hp. To calculate the power gains offered at a given boost level, simply divide the boost number by 14.7, add 1, and multiply that number by the original power output of the normally aspirated motor. If we upped the boost pressure on our 300hp 4.6L to 20 psi, our new (theoretical) power output would be an impressive 708 hp. This same formula can be applied to any motor and boost level as long as you know the original power output of the normally aspirated motor and the desired boost level.


Read more: Ford Mustang Turbo Size Guide - Muscle Mustangs & Fast Fords Magazine
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Very interesting thought I would share this, any inputs?
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Old 04-07-2015, 10:02 AM   #2
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Kinda COOL !! I guess the thing is I have been told that a 4.6L will come apart at around 450 hp the bottom end that is. But I'm not 100% sure on that .


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Old 04-07-2015, 11:05 AM   #3
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I just got mine rebuilt for 650 and now im a looking at turbocharging!
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Old 04-07-2015, 04:13 PM   #4
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Nice !!


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Old 04-07-2015, 06:29 PM   #5
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$650 for a rebuild gets you stock parts that won't take more than 400. However, this article gets the maths somewhat right. A forged motor with a good set of heads/cams and 20 psi will make close to 700.

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Old 04-07-2015, 06:40 PM   #6
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Quote:
Originally Posted by scottydsntknow View Post
$650 for a rebuild gets you stock parts that won't take more than 400. However, this article gets the maths somewhat right. A forged motor with a good set of heads/cams and 20 psi will make close to 700.

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I believe he meant 650hp

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Old 04-07-2015, 06:43 PM   #7
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Ah...


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Old 04-07-2015, 08:56 PM   #8
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Yeah I spent $7200 capable of 650HP
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Old 04-07-2015, 09:00 PM   #9
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Are we talking crank, flywheel, or rear wheel hp?


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Old 04-07-2015, 09:03 PM   #10
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Crank
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Old 04-07-2015, 09:07 PM   #11
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One of my local machine shops built a 4.6 3V and got 702RWHP out of it, but it was highly modded...
702RWHP with 20lbs of boost...
But unfortunately they sold the engine, used it for drag racing...


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Old 04-07-2015, 09:37 PM   #12
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Damn, yeah I brought mine to a guy in Oceanside California and all he works on is mustangs so I trust his work pretty good he has some nice builds!
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Old 04-07-2015, 10:06 PM   #13
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How much more hp can you get out of a good set of cams ??


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Old 04-07-2015, 10:24 PM   #14
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Really depend on what else has been done to the engine and how aggressive the cam is...


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Old 04-08-2015, 01:31 AM   #15
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I have a lot of bolt ons . Shorty headers , FR. Intake , Big TB, TB spacer , FR cai , BBK Fuelrails Bigger fuel injectors . Etc nothing that big for engine. Was thinking mother thumper cars but not sure witch to get ?? Click image for larger version

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Old 04-08-2015, 03:31 AM   #16
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Cams I hate auto correct 😁


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Old 04-15-2015, 07:42 PM   #17
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I have forged seal power kit and Ford Racing 6 bolt crank with stock compression 9:8:1
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Old 04-15-2015, 11:00 PM   #18
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Nice very nice !!


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