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03-10-2009, 01:34 PM
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#26 | | RS Veteran
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Originally Posted by BB6SE  I used exxon's calculations with mine. 320x1.35=432hp
the correct formula should be 320whp/(1-drivetrain loss)
How am I pulling it out of my ass? the average awd vehicle is 25% is it not?
But whatever the calculation is.. it's not 450 to the crank. | Okay. Using your formula of 320whp/(1-drivetrain loss)
320whp / (1-.3) = 320whp / .7 = 457hp
So, um, using your calculation, it is above 450 to the crank.
Am I missing something?
If I use your 25%, despite the fact I have dyno numbers which represent 29.3%, it would be 320whp / (1-.25) = 320whp /.75 = 427hp. How is that such an outrage from 450hp?
You can't "average" out a generalization for drivetrain loss for ALL AWD, RWD, FWD cars. What you can do to get an accurate hp reading is to run your car on a dyno stock, run your car on the same dyno under similar conditions modified. You use those numbers to extrapolate a reasonable estimate of crank hp. Here is how I calculated 450hp. Let me know if its unreasonable. I'd love to learn a better way.
Stock car: 212WHP Stock crank HP: 300HP
212WHP / 300HP = 0.70667 - 1 = 0.2933 drivetrain loss
Modified car on the same dyno: 320WHP Stock crank HP: X
320WHP / X = 0.70667
320WHP = 0.70667X
320WHP / 0.70667 = X
X = 452.83 Crank HP
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2004 World Rally Blue Subaru Impreza WRX STi - 450HP @ 21.5 PSI
Last edited by fukamoto; 03-10-2009 at 01:40 PM.
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03-10-2009, 05:21 PM
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#27 | | RS.net, where our google ads make absolutely no sense!
Join Date: Apr 2005 Location: vancouver
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^^^^^ Dude's you all have way to much free time on your hands just let the dude sell his car and find something else to do with your over abundance of free time.
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03-10-2009, 06:47 PM
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#28 | | NOOB, Not Quite a Regular!
Join Date: Jun 2004 Location: edmonton
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| Quote:
Originally Posted by fukamoto Okay. Using your formula of 320whp/(1-drivetrain loss)
320whp / (1-.3) = 320whp / .7 = 457hp
So, um, using your calculation, it is above 450 to the crank.
Am I missing something?
If I use your 25%, despite the fact I have dyno numbers which represent 29.3%, it would be 320whp / (1-.25) = 320whp /.75 = 427hp. How is that such an outrage from 450hp?
You can't "average" out a generalization for drivetrain loss for ALL AWD, RWD, FWD cars. What you can do to get an accurate hp reading is to run your car on a dyno stock, run your car on the same dyno under similar conditions modified. You use those numbers to extrapolate a reasonable estimate of crank hp.
Here is how I calculated 450hp. Let me know if its unreasonable. I'd love to learn a better way.
Stock car: 212WHP Stock crank HP: 300HP
212WHP / 300HP = 0.70667 - 1 = 0.2933 drivetrain loss
Modified car on the same dyno: 320WHP Stock crank HP: X
320WHP / X = 0.70667
320WHP = 0.70667X
320WHP / 0.70667 = X
X = 452.83 Crank HP | That's the correct formula:
320whp/(1-drivetrain loss)
I just use the average of 25% for awd cars. I've been using that on mine for my calculations. But you're right, that doesn't apply to all.
Anyways, the bright side of this is that I kept bumping your thread to the top  | |
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03-10-2009, 07:07 PM
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#29 | | Ye olde moderator
Join Date: Nov 2000 Location: Vancouvwhore
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Originally Posted by BB6SE the bright side of this is that I kept bumping your thread to the top | They shitty thing is that you got yourself banned from the buy and sell because you couldn't read my simple instructions. 
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Revscene ADMIN elite
Sales and Installer at Certified Auto Sound
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03-10-2009, 08:11 PM
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#30 | | I don't get it
Join Date: Jul 2006 Location: coquitlam
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Originally Posted by orgasm_donor They shitty thing is that you got yourself banned from the buy and sell because you couldn't read my simple instructions. | Yikes, it was a simple joke, little extreme... no?
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Irishman driving a German car posting on a (mostly) Asain website FTW
1993 Audi S4- minty
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03-10-2009, 08:20 PM
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#31 | | Ye olde moderator
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Originally Posted by cs_729 Yikes, it was a simple joke, little extreme... no? | Extreme? No. This is the Buy and Sell...not a forum discussion about hp ratings.
Power Tripping? No. I am just too lazy to explain things over and over again. Its very simple - pertinent questions about the vehicle are fine. Arguments about this kind of garbage can stay in fight club or to PM's. I gave a warning and the guy decided against it. At least I didn't use pepper spray.
Back on Topic for Fukamoto. Sorry to continue to shit all over your thread amigo.
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Revscene ADMIN elite
Sales and Installer at Certified Auto Sound
Maple Ridge, BC | |
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03-12-2009, 02:50 PM
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#32 | | RS Veteran
Join Date: Feb 2002 Location: Boston
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Bump guys. Insurance runs out in 2 weeks, moving in 6 weeks.
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2004 World Rally Blue Subaru Impreza WRX STi - 450HP @ 21.5 PSI | |
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03-13-2009, 11:35 PM
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#33 | | OMGWTFBBQ is a common word I say everyday
Join Date: Apr 2001 Location: Vancouver, BC
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if not sold by then, will the car still be for sale after you leave?
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03-14-2009, 08:16 PM
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#34 | | I don't get it
Join Date: Oct 2004 Location: Coquitlam
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can you post some recent pics? or send them to me? interior/engine bay ect
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03-14-2009, 08:55 PM
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#35 | | Revscene.net has a homepage?!
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I believe the car has been sold already
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Just because my username is Cyclonus doesn't mean I can't have pic of Optimus as my avatar =P
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03-15-2009, 11:44 AM
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#36 | | Banned (ABWS)
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Bump for you if its not sold. Saw you driving by the churchs on slocan. Very nice clean car!
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03-16-2009, 09:56 PM
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#37 | | Rs has made me the man i am today!
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ooooh don u crazy man............
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03-17-2009, 10:54 AM
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#38 | | RS Veteran
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Car has been sold. Thanks guys.
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2004 World Rally Blue Subaru Impreza WRX STi - 450HP @ 21.5 PSI | |
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