Whp vs. Engine hp?

Dizon248

NISMO 370Z (2009– )


2010 Nissan 370Z NISMO
The NISMO version was introduced for the 2009 year model. The engine produces 350 bhp (260 kW) at 7,400 RPM and 276 lb·ft (374 N·m) at 5,200 RPM with revised ECU settings and exhaust setup. Transmission choice is limited to a 6-speed manual with Nissan's new "SynchroRev Match" function. Handling is improved via stiffened springs and stabilizer bars compared to the 370Z Coupe. Other equipment includes 19-inch RAYS forged aluminum-alloy wheels with Yokohama ADVAN Sport Y-rated tires (P245/40ZR19 front, P285/35ZR19 rear), 14.0-inch front and 13.8-inch rear vented rotors, NISMO Sport Brakes with 4-piston front and 2-piston rear aluminum calipers, and a fully integrated chin spoiler.

Taken from Nissan 370Z - Wikipedia, the free encyclopedia

So the thing that is causing the differences between a NISMO and a non NISMO + exhaust is the ECU tune, which was what I said earlier. That is why the guy with a non NISMO + exhaust was only getting 5whp, he is missing the ECU tune that the NISMO has.

Dizon248

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

Pelican170

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

KaienZ34

E=Mc2... wait wait math is hard. Just get in, turn on, push the pedal on the right and go fast, done.

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b1adesofcha0s

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

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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.

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Dizon248

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.

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.

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

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Dizon248

Haha, I'm Asian too. Funny eh?

b1adesofcha0s

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

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phelan

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

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b1adesofcha0s

Come join the party!

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dixon cider

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christian370z

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

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