WHP to crank HP calculator - TriStateTuners.com :: Home of Tristate Auto Enthusiast

Fujito · 06-17-2010, 11:45 PM

http://www.mk5cortinaestate.co.uk/calculator4.php

People who aren't really into cars may not grasp the true power of your car when you say "XXX WHP". If they're comparing that to crank HP then they are underestimating you, so for reference it may be good to just put it into noob terms for them.

Kinda reads like a Mustang dyno.
Post up results to see if this thing is somewhat accurate. You'll have to know the advertised HP from the factory and your stock dyno results.

After doing a quick google, Mustang dyno's read 11-12% lower than Dynojets.

1. 08 Evo X rated at 295 bhp from the factory
2. Base dyno at 255 WHP on a Dynojet
2b. 255-255(.12)=225.4
3. calculator=223 WHP

seems correct.

Fujito · 06-17-2010, 11:49 PM

Stock turbo
272/272 JUN cams/springs/retainers
AMS HFC
Tomei titanium 3" exhaust
ARC air box
ARC UICP
ARC FMIC
AMS downpipe

Made 352 WHP on Ivey's Dynojet

431 crank HP

Khellen · 06-18-2010, 12:13 PM

Cool find! One question though, correct me if I'm wrong.....but for AWD, don't different cars have much different drivetrain losses?

If that's the case a calculator really isnt very accurate.

Obviously 450 AWHP in a GTR is much different then 450 AWHP then an STi.

420sx · 06-18-2010, 12:20 PM

Stock HP rating... minus 15% = whp. Done and done.

I dont need a caluculator to tell me im making 15% less than jack ****.

Nick Merrone · 06-18-2010, 12:48 PM

I already knew my car was slow..but now im depressed.

Chris B. · 06-18-2010, 04:04 PM

It seems really optimistic for my car. According to that and my car's results stock on a Mustang Dyno, its under rated by 25 HP, which I'm sure isn't true.

Fujito · 06-18-2010, 04:08 PM

I heard that Ford does underrate their cars

activeseven · 06-18-2010, 04:09 PM

Hmm, says my car is 538hp at the crank. Now sure about the "four wheel" drive option though.

EDIT: looks like they are giving Four Wheel drive cars ~18%, prolly about right

bl@ckvr4 · 06-18-2010, 05:15 PM

I know 3000GTs lose close to 60hp-70hp in stock trim through the drive train. Mainly due to how freaking heavy the stock driveshaft is. ~60lbs.

SovXietday · 06-18-2010, 09:26 PM

Back when I was 325whp. 372 at the crank says it.

**Got Insulin?** · 06-18-2010, 09:53 PM

Quote:

Originally Posted by 420sx

Stock HP rating... minus 15% = whp. Done and done.

I dont need a caluculator to tell me im making 15% less than jack ****.

This isn't actually completely true. It's a really vague estimate and there are variations from car to car, dyno to dyno, so it's kind of tough to say everyone looses 15-18%. I'll try to find the article I read on it.

Midnight Ryderz · 06-18-2010, 10:17 PM

good find

TNTramair · 06-18-2010, 10:45 PM

Quote:

Originally Posted by Got Insulin?

This isn't actually completely true. It's a really vague estimate and there are variations from car to car, dyno to dyno, so it's kind of tough to say everyone looses 15-18%. I'll try to find the article I read on it.

i did those calculations based on my RWHP and it was a 15% increase to crank power....or 14.9992% increase to be exact. there will allways be variations but generally its a pretty good guestimate when you go with the 15-18%.

crazysaywhat · 06-18-2010, 11:20 PM

thats sweet that means 352whp in my rwd is 411 crank haha shibby

ndubz · 06-19-2010, 01:17 AM

in reality, drivetrain loss will be different on different dynos. and Ive seen rwd cars that loose more the than awd cars. for example, subarus loose a relatively low amount compared to other awd cars (supposed to be 25%, subies are from like 17%-22%). in reality the numbers really mean very little. cool find tho

SovXietday · 06-19-2010, 12:14 PM

^I may be wrong with this, but I believe Subies are a heavy RWD bias, which would explain that.

18psiWhiteMS3 · 11-23-2010, 05:16 PM

392 fwhp in my ms3, 447 crank

OutToWinPAHC · 11-23-2010, 05:57 PM

"543hp at the crank"

renn · 11-23-2010, 06:07 PM

eh, i always just say what i made in whp. every dyno is different and everyones car loses a different amount in the drivetrain, so it's not that accurate of a calculator. not to mention the variability of a dyno pull depending on gear, temperature, and humidity.

OutToWinPAHC · 11-23-2010, 06:14 PM

Most but not all trans have a 1:1 gear... typically the gear used.

06-17-2010, 11:45 PM	#1
Fujito Tri-State Post Whore Join Date: Dec 2008 Member #10571 My Ride: Toyota Celica iTrader: (0)	WHP to crank HP calculator http://www.mk5cortinaestate.co.uk/calculator4.php People who aren't really into cars may not grasp the true power of your car when you say "XXX WHP". If they're comparing that to crank HP then they are underestimating you, so for reference it may be good to just put it into noob terms for them. Kinda reads like a Mustang dyno. Post up results to see if this thing is somewhat accurate. You'll have to know the advertised HP from the factory and your stock dyno results. After doing a quick google, Mustang dyno's read 11-12% lower than Dynojets. 1. 08 Evo X rated at 295 bhp from the factory 2. Base dyno at 255 WHP on a Dynojet 2b. 255-255(.12)=225.4 3. calculator=223 WHP seems correct.

06-18-2010, 12:13 PM	#3
Khellen Tri-State Post Whore Join Date: Sep 2007 Location: Saylorsburg, PA Member #5720 My Ride: 05 STi 30R Brotated 400awhp iTrader: (7)	Cool find! One question though, correct me if I'm wrong.....but for AWD, don't different cars have much different drivetrain losses? If that's the case a calculator really isnt very accurate. Obviously 450 AWHP in a GTR is much different then 450 AWHP then an STi. __________________ 2005 Subaru WRX STi - Brotated 30R - 400awhp 1994 Mazda Miata 2008 Honda Accord 2004 Honda S2000 2002 Subaru Outback LL Bean

06-18-2010, 12:20 PM	#4
420sx Tri-State Post Whore Join Date: Oct 2006 Location: Warrington, PA Member #2811 My Ride: '98 240sx, 98 Impreza L, 00 SV650 iTrader: (5)	Stock HP rating... minus 15% = whp. Done and done. I dont need a caluculator to tell me im making 15% less than jack ****. __________________ loltst

06-18-2010, 04:09 PM	#8
activeseven Tri-State Aficionado Join Date: Jul 2006 Location: Red Bank, New Jersey Member #2195 My Ride: 94 VR4, 07 Civic Si, 08 GSXR 750 iTrader: (0)	Hmm, says my car is 538hp at the crank. Now sure about the "four wheel" drive option though. EDIT: looks like they are giving Four Wheel drive cars ~18%, prolly about right __________________ [ s e v e n ] Last edited by activeseven; 06-18-2010 at 04:14 PM.

06-18-2010, 05:15 PM	#9
bl@ckvr4 Tri-State Post Whore Join Date: Apr 2007 Member #4236 My Ride: 1992 mitsubishi VR4 iTrader: (1)	I know 3000GTs lose close to 60hp-70hp in stock trim through the drive train. Mainly due to how freaking heavy the stock driveshaft is. ~60lbs. __________________ 1992 Mitsubishi 3000GT VR-4 =:The ecstasy lasts as long as the gasoline:= 1993 Mitsubishi 3000GT VR-4 =:Yes. Another one.:= 1997 Mitsubishi Eclipse RS =:Danger to manifold!:= 1991 Mitsubishi Galant VR-4 =:No, it's not for sale.:=

06-17-2010, 11:49 PM	#2
Fujito Tri-State Post Whore Join Date: Dec 2008 Member #10571 My Ride: Toyota Celica iTrader: (0)	Stock turbo 272/272 JUN cams/springs/retainers AMS HFC Tomei titanium 3" exhaust ARC air box ARC UICP ARC FMIC AMS downpipe Made 352 WHP on Ivey's Dynojet 431 crank HP

06-18-2010, 12:48 PM	#5
Nick Merrone Tri-State Post Whore Banned Join Date: Feb 2009 Location: philly Member #10807 My Ride: c18det hatch iTrader: (1)	I already knew my car was slow..but now im depressed.

06-18-2010, 04:04 PM	#6
Chris B. Tri-State Post Whore Join Date: Jul 2009 Location: Lehigh Valley Member #14208 My Ride: is Sonic Blue iTrader: (0)	It seems really optimistic for my car. According to that and my car's results stock on a Mustang Dyno, its under rated by 25 HP, which I'm sure isn't true.

06-18-2010, 04:08 PM	#7
Fujito Tri-State Post Whore Join Date: Dec 2008 Member #10571 My Ride: Toyota Celica iTrader: (0)	I heard that Ford does underrate their cars

06-18-2010, 10:17 PM	#12
Midnight Ryderz Tri-State Aficionado Join Date: May 2009 Location: Scranton area PA Member #13781 My Ride: 93 Sc300 iTrader: (1)	good find

06-19-2010, 01:17 AM	#15
ndubz Tri-State Post Whore Join Date: Oct 2007 Location: tristate area Member #6107 iTrader: (1)	in reality, drivetrain loss will be different on different dynos. and Ive seen rwd cars that loose more the than awd cars. for example, subarus loose a relatively low amount compared to other awd cars (supposed to be 25%, subies are from like 17%-22%). in reality the numbers really mean very little. cool find tho

11-23-2010, 05:16 PM	#17
18psiWhiteMS3 Tri-State Aficionado Join Date: Jul 2007 Member #5415 My Ride: 2007 ZX-10R, 1995 Civic DX iTrader: (0)	392 fwhp in my ms3, 447 crank __________________ 2007 Green ZX10R Mods:Dark Tinted Windscreen, CarbonFiber TankPad, Rear Seat Cowl, Dual Carbon Fiber Akrapovic Full System, K&N Filter, Powercommander, Supersprox 45T rear sprocket, Custom Dyno Tune

11-23-2010, 05:57 PM	#18
OutToWinPAHC Tri-State Post Whore Join Date: Jun 2007 Location: Tokelau Member #5081 My Ride: R33 GTS25T, RHD E46, Truck, part R32 GTR iTrader: (2)	"543hp at the crank"

11-23-2010, 06:07 PM	#19
renn Tri-State Addict Join Date: May 2009 Location: NJ Member #13821 iTrader: (1)	eh, i always just say what i made in whp. every dyno is different and everyones car loses a different amount in the drivetrain, so it's not that accurate of a calculator. not to mention the variability of a dyno pull depending on gear, temperature, and humidity.

11-23-2010, 06:14 PM	#20
OutToWinPAHC Tri-State Post Whore Join Date: Jun 2007 Location: Tokelau Member #5081 My Ride: R33 GTS25T, RHD E46, Truck, part R32 GTR iTrader: (2)	Most but not all trans have a 1:1 gear... typically the gear used.

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