Whp vs. Engine hp?

KaienZ34 · 05-11-2011, 03:06 PM

E=Mc2...

wait wait math is hard. Just get in, turn on, push the pedal on the right and go fast, done.

b1adesofcha0s · 05-11-2011, 03:25 PM

Looks like the

is finished and we've come up with a working equation

Pelican170 · 05-11-2011, 03:26 PM

Quote:

Originally Posted by Dizon248

And Pelican, sorry about earlier, I just got a little heated.

Aaahh gotcha with ur above post... And no problem man. We all get heated up once in a while!

onzedge · 05-11-2011, 03:27 PM

I am definitely not a math whiz, but i wonder if we are going with an assumption that the bhp to whp loss is constant. I do not know, just asking.

SeattleLion · 05-11-2011, 03:27 PM

Aside from the dyno itself, isn't whp affected by the tires? The tires have to transmit the energy to the dyno, so if the tires have a super high coeficient of friction, then the dyno will read higher whp than from a tire that is less slippery. Some of the bhp is lost as heat as the tires flex and slip.

Cmike2780 · 05-11-2011, 03:39 PM

Quote:

Originally Posted by SeattleLion

Aside from the dyno itself, isn't whp affected by the tires? The tires have to transmit the energy to the dyno, so if the tires have a super high coeficient of friction, then the dyno will read higher whp than from a tire that is less slippery. Some of the bhp is lost as heat as the tires flex and slip.

That's exacly why you have to have vehicle specific baseline readings. There are too many variables to do an dead-on accurate gains between two cars. The equation I posted are just approximations based on available data. We don't know for sure, for example, if the 350bhp is an accurate baseline @ the crank. Basically, we need at least three known values specific to the vehicle in question. For arguement sake, those values give you a rough idea.
....my brain hurts know.
Also, I think I just added to the stereotype about Asians being good at math.

Dizon248 · 05-11-2011, 03:44 PM

Quote:

Originally Posted by onzedge

I am definitely not a math whiz, but i wonder if we are going with an assumption that the bhp to whp loss is constant. I do not know, just asking.

I figure it is constant if the drivetrain is constant. The % lost between different cars/transmissions will be different.

EDIT: and as the above posters mentioned, tires too. Basically any mechanical piece that helps transfer the power from the engine down to the road WILL affect the final hp given on the wheels. You change any piece of that in between the engine and the road, and you will have different % loss.

Dizon248 · 05-11-2011, 03:47 PM

Quote:

Originally Posted by Cmike2780

That's exacly why you have to have vehicle specific baseline readings. There are too many variables to do an dead-on accurate gains between two cars. The equation I posted are just approximations based on available data. We don't know for sure, for example, if the 350bhp is an accurate baseline @ the crank. Basically, we need at least three known values specific to the vehicle in question. For arguement sake, those values give you a rough idea.

....my brain hurts know.

Also, did I think I just added to the stereotype about Asians being good at math.

Haha, I'm Asian too. Funny eh?

b1adesofcha0s · 05-11-2011, 04:05 PM

Quote:

Originally Posted by Dizon248

Haha, I'm Asian too. Funny eh?

+1 for the Asian crew, but I'm south Asian. Got here late to the math party

phelan · 05-11-2011, 06:39 PM

i heard there was math in here. need another asian?

b1adesofcha0s · 05-11-2011, 07:04 PM

Quote:

Originally Posted by phelan

i heard there was math in here. need another asian?

Come join the party!

dixon cider · 05-11-2011, 07:20 PM

Quote:

Originally Posted by phelan

i heard there was math in here. need another asian?

Red__Zed · 05-11-2011, 07:24 PM

I'm not Asian, but I'm pretty good with numbers.

b1adesofcha0s · 05-11-2011, 07:32 PM

Quote:

Originally Posted by Red__Zed

I'm not Asian, but I'm pretty good with numbers.

You can be an honorary asian <3

christian370z · 05-11-2011, 07:33 PM

Quote:

Originally Posted by phelan

i heard there was math in here. need another asian?

Hahaha, that's even better now that I am in China haha.

05-11-2011, 03:06 PM	#61 (permalink)
KaienZ34 A True Z Fanatic Join Date: Oct 2009 Location: LA. not L.a. Posts: 21,652 Drives: Z34 Tour/Sport Rep Power: 177	E=Mc2... wait wait math is hard. Just get in, turn on, push the pedal on the right and go fast, done. __________________ *"These Violent Delights Have Violent Ends"* http://www.the370z.com/members/kaienz34-albums-z34.html

05-11-2011, 03:25 PM	#62 (permalink)
b1adesofcha0s A True Z Fanatic Join Date: Jan 2011 Location: MD Posts: 40,963 Drives: HypeTrain Choo Choo! Rep Power: 141	Looks like the is finished and we've come up with a working equation __________________ Project: b1adeZmobile (2009 370Z) \| Uprev Tune by AAM Competition \| Berk Exhaust Project: b1adeZmobile 2.0 (2014 C7 Z51) \| Corsa Xtreme Exhaust

05-11-2011, 03:27 PM	#64 (permalink)
onzedge A True Z Fanatic Join Date: Apr 2010 Location: Battle Lake MN Age: 63 Posts: 183,964 Drives: 370Z 240Z Rep Power: 2684736	I am definitely not a math whiz, but i wonder if we are going with an assumption that the bhp to whp loss is constant. I do not know, just asking. __________________ Koni\|Swift\|Michelin\|Motordyne\|Berk\|RJM Performance\|Gates\|SPL\|Motul\|Technafit\|Ate Super Blue\|Hawk Tommy Kaira\|Momo\|Optima\|Hella\|Hotchkis\|Red Line\|ZSpeed\|Stillen\|B&M\|H&R

05-11-2011, 06:39 PM	#70 (permalink)
phelan A True Z Fanatic Join Date: Apr 2009 Location: CA Age: 38 Posts: 9,513 Drives: Scoobaroo Rep Power: 3406	i heard there was math in here. need another asian? __________________ 凛 ('Rin') - 2009 Nissan 370Z With silence comes peace. With peace comes freedom. With freedom comes silence.

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05-11-2011, 03:27 PM	#65 (permalink)
SeattleLion Base Member Join Date: Sep 2010 Location: Seattle WA Posts: 226 Drives: '13 Mustang GT Prem. Rep Power: 233	Aside from the dyno itself, isn't whp affected by the tires? The tires have to transmit the energy to the dyno, so if the tires have a super high coeficient of friction, then the dyno will read higher whp than from a tire that is less slippery. Some of the bhp is lost as heat as the tires flex and slip.

05-11-2011, 07:24 PM	#73 (permalink)
Red__Zed A True Z Fanatic Join Date: Jul 2010 Location: window seat Posts: 28,940 Drives: Mostly on two wheels Rep Power: 119	I'm not Asian, but I'm pretty good with numbers.