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PC parasitic loss numbers

z06psi

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ahl395

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+1 I'd be interested in knowing this also.
 

ProChargerTECH

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Well, thats kind of a loaded question.

There are a lot of factors that lead to "drive power to belt"
Or same as a turbo as "power to turn exhaust turbine"

IE:
600 cube BBC trying to make 15psi = high load
302 cube SBF trying to make 25psi = lower load

Also, acceleration of a blower is more than sustained.


However, both a D1SC and D1X are very low drive input HP.
(the D1X being less, due to the more efficient compressor assembly)

On a standard kit, not really much at all...
Making 1000hp, still really not that much...
Far far far, less then most really care about.








.
 

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So still no answer? How about an educated guess ProchargerTECH?

Heres my .02. When the last-gen GT500 came out I think I remember Ford saying that it took about 100 crank hp to turn the supercharger at max power. Now that's a Roots blower so it may be a little different than a centrifugal. Also as the superchargers get bigger to make more power the mass of the larger parts probably also increases the parasitic loss. If I were guessing, and it is just a guess, I would say 1000whp is seeing 120-150whp loss.
 
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z06psi

z06psi

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Well, thats kind of a loaded question.

There are a lot of factors that lead to "drive power to belt"
Or same as a turbo as "power to turn exhaust turbine"

IE:
600 cube BBC trying to make 15psi = high load
302 cube SBF trying to make 25psi = lower load

Also, acceleration of a blower is more than sustained.


However, both a D1SC and D1X are very low drive input HP.
(the D1X being less, due to the more efficient compressor assembly)

On a standard kit, not really much at all...
Making 1000hp, still really not that much...
Far far far, less then most really care about.








.
I kind of gave you my specific operating parameters. Any idea what my specific case is?
 

Barrel

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I kind of gave you my specific operating parameters. Any idea what my specific case is?
Pretty sure the reason he's dancing around this is because it's company proprietary. My gut tells me <5% total parasitic loss.
 
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z06psi

z06psi

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Pretty sure the reason he's dancing around this is because it's company proprietary. My gut tells me <5% total parasitic loss.
I wouldn't think a range of h.p. would be proprietary.


Specific testing numbers, because they have those, I would understand.





My whole point is to understand what the motor is actually producing using rwhp numbers.

750 rwhp with 12% drivetrain (manual) and we will take your case and say 6-9% for blower. That makes motor production over 900.
 

ProChargerTECH

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So still no answer? How about an educated guess ProchargerTECH?

Heres my .02. When the last-gen GT500 came out I think I remember Ford saying that it took about 100 crank hp to turn the supercharger at max power. Now that's a Roots blower so it may be a little different than a centrifugal. Also as the superchargers get bigger to make more power the mass of the larger parts probably also increases the parasitic loss. If I were guessing, and it is just a guess, I would say 1000whp is seeing 120-150whp loss.
It's far less the 120-150 on something like this 5.0L with stock heads/cams.

The less efficient of a compressor, the more HP it takes to move a given amount of air.

The D-1X, P-1X, F-1A-94, and F-3R-136 are some of the most efficient compressors we have ever made (outside of our industrial division)

NOTE: its easier to make a compressor ultra efficient if the operational window is very small (IE: industrial applications) and in those applications, all we care about is the KW usage for a given CFM/Pressure. LINK



I kind of gave you my specific operating parameters. Any idea what my specific case is?
I gave you basically the answer without giving it. LOL.

Pretty sure the reason he's dancing around this is because it's company proprietary. My gut tells me <5% total parasitic loss.
Exactly, beyond the fact that there are many variables that influence that "HP" number. I am not going to be the only supercharger company giving out HP drive power numbers... LOL.

I wouldn't think a range of h.p. would be proprietary. Specific testing numbers, because they have those, I would understand.My whole point is to understand what the motor is actually producing using rwhp numbers.

750 rwhp with 12% drivetrain (manual) and we will take your case and say 6-9% for blower. That makes motor production over 900.

Again you have to account factors that are as follows.

- inlet air temp (yes this effects it more then you would guess)
- CFM being moved
- acceleration rate of gear box
- pressure being created
- a couple other random factors.

What I usually do is take my MAF reading when the car is stock. And then look at what she is making RWHP on the dyno at every 1,000 rpm. I can then get a pretty good idea of her efficiency through the curve for a given airflow.

My other sure fire way is just math. True curb weight, and track results.
Since then its pretty much a given for what she's making that day.

Sorry I can't be more of a help getting that number nailed down. :)
 

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z06psi

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z06psi

z06psi

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ahl395

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Can't blame him for not giving us an exact number. Not a very good business move on their part and with all the variables there'd never be a way to get you an exact number.

Way less than 120 is good enough for me lol.
 
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z06psi

z06psi

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Can't blame him for not giving us an exact number. Not a very good business move on their part and with all the variables there'd never be a way to get you an exact number.

Way less than 120 is good enough for me lol.
I was asking for a range. Lets say 75-100 hp for our motors.
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