Loss of 22.5% HP

lando76 · 08-13-2009, 07:56 PM

Can this be right

Ok say a stock 370Z puts down 258 hp to the wheels, and its rated at 332 hp to the flywheel. Easy math says thats a 74 hp loss which is 22.5%. That seems like alot for a rear wheel drive car to lose that much through the drivetrain. Now if it were AWD then I would believe it. Is Nissan fudging there numbers HMMMMMMMMM.

kannibul · 08-13-2009, 08:01 PM

Quote:

Originally Posted by lando76

Can this be right

Ok say a stock 370Z puts down 258 hp to the wheels, and its rated at 332 hp to the flywheel. Easy math says thats a 74 hp loss which is 22.5%. That seems like alot for a rear wheel drive car to lose that much through the drivetrain. Now if it were AWD then I would believe it. Is Nissan fudging there numbers HMMMMMMMMM.

I know when there are 90deg turns involved, there is a power loss - so, most of that is accounted for in the rear diff as it goes from the driveshaft to the rear axles.

I don't remember the percentages though - it's somewhere around 15-25%, so 22.5 isn't out of the norm, I'd think...

My bike is that way - it has a 90 for the drive shaft from the engine, and another in the final drive for about a 30% loss.

2theextreme · 08-13-2009, 08:12 PM

258 seems low...unless my Z had amazing numbers to begin with. My first dyno pure stock:

Red370 · 08-13-2009, 08:18 PM

258 is low, dyno avg is between 270-280

zZSportZz · 08-13-2009, 08:24 PM

Quote:

Originally Posted by 2theextreme

258 seems low...unless my Z had amazing numbers to begin with. My first dyno pure stock:

My dyno numbers were the same as this...

Island_370 · 08-13-2009, 08:27 PM

Quote:

Originally Posted by lando76

Can this be right

Ok say a stock 370Z puts down 258 hp to the wheels, and its rated at 332 hp to the flywheel. Easy math says thats a 74 hp loss which is 22.5%. That seems like alot for a rear wheel drive car to lose that much through the drivetrain. Now if it were AWD then I would believe it. Is Nissan fudging there numbers HMMMMMMMMM.

1 of 3 reasons......

It is a heartbreaker dyno
the correction factors are wrong on the dyno or (the most likely)

The dyno is at a shop that is going to sell you mods and then re-dyno. They want to get a low baseline number so that $1000 pulley gets you 25 hp and you will pay another $2000 for a high flow Kuhneutson valve or a good set of high precision muffler bearings. 8-)

2theextreme · 08-13-2009, 08:30 PM

Quote:

Originally Posted by zZSportZz

My dyno numbers were the same as this...

And the cool thing about this? Mine is a 7AT and zZSportZz is a 6MT. Shows how darn close they are.

RCZ · 08-13-2009, 08:36 PM

guys, different dynos read lower and higher on the same exact car. Im sorry to say but this thread was doomed before it started.

It depends on the dyno, most low low reading dynos like a mustandyne or a dyno dynamics will read around 260 for a stock Z. A normal reading dyno like a dynojet will run around 270 and a high reader like the dynapaks will run 280 stock.

This is not a rule, its just ranges. There are ringers out there.

nogoodname · 08-13-2009, 08:36 PM

what......urs is a 7AT.....i thought it was a 6MT all this time

zZSportZz · 08-13-2009, 08:43 PM

Quote:

Originally Posted by nogoodname

what......urs is a 7AT.....i thought it was a 6MT all this time

The 7AT near his avatar didn't give it away?

2theextreme · 08-13-2009, 08:44 PM

Quote:

Originally Posted by nogoodname

what......urs is a 7AT.....i thought it was a 6MT all this time

Nope....7AT......good thing actually since I broke my left foot back in March!

tru_Asiatik · 08-13-2009, 09:29 PM

Quote:

Originally Posted by Island_370

1 of 3 reasons......

It is a heartbreaker dyno
the correction factors are wrong on the dyno or (the most likely)

The dyno is at a shop that is going to sell you mods and then re-dyno. They want to get a low baseline number so that $1000 pulley gets you 25 hp and you will pay another $2000 for a high flow Kuhneutson valve or a good set of high precision muffler bearings. 8-)

#4 nissan over rates thier engines

...i heard

Shunya · 08-13-2009, 09:38 PM

Quote:

Originally Posted by Red370

258 is low, dyno avg is between 270-280

GTRFAN · 08-13-2009, 11:37 PM

Quote:

Originally Posted by Island_370

1 of 3 reasons......
...you will pay another $2000 for a high flow Kuhneutson valve or a good set of high precision muffler bearings. 8-)

LOL
Replacement : KaleCoAuto, Hard to find automotive items!

m4a1mustang · 08-14-2009, 07:17 AM

Quote:

Originally Posted by RCZ

guys, different dynos read lower and higher on the same exact car. Im sorry to say but this thread was doomed before it started.

It depends on the dyno, most low low reading dynos like a mustandyne or a dyno dynamics will read around 260 for a stock Z. A normal reading dyno like a dynojet will run around 270 and a high reader like the dynapaks will run 280 stock.

This is not a rule, its just ranges. There are ringers out there.

+1. I'm going to get a baseline on a dyno-dynamics tomorrow. Yeah, it sucks that I'm not going to see DynoJet numbers, but I just want to track the improvements my intake and exhaust will provide... so no big deal. If I want some big numbers to advertise in my sig I will go all the way out to Altered and run on their DynoJet.

Anyhow, this serves as another The370Z.com Learning Lesson (TM) that when we try to compare dyno numbers we should disclose the type of dyno used.

08-13-2009, 07:56 PM	#1 (permalink)
lando76 Base Member Join Date: Jul 2009 Location: ca Posts: 107 Drives: N/A Rep Power: 16	Loss of 22.5% HP Can this be right Ok say a stock 370Z puts down 258 hp to the wheels, and its rated at 332 hp to the flywheel. Easy math says thats a 74 hp loss which is 22.5%. That seems like alot for a rear wheel drive car to lose that much through the drivetrain. Now if it were AWD then I would believe it. Is Nissan fudging there numbers HMMMMMMMMM.

08-13-2009, 08:12 PM	#3 (permalink)
2theextreme RIP Tony :( (1969-2015) Join Date: Feb 2009 Location: Northern Virginia Posts: 18,802 Drives: '14 Mustang GT/CS Rep Power: 67	258 seems low...unless my Z had amazing numbers to begin with. My first dyno pure stock: __________________ SpinTech Mufflers, Airaid CAI, JBA H-Pipe, Lethal Performance Over Axle Pipes, MMD Quarter Panel Louvers, Cervini's Ram Air Type IV Hood, Carbon Fiber Radiator Cover, GT500 Rear Valance, Quad Exhaust Tips

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08-13-2009, 08:18 PM	#4 (permalink)
Red370 A True Z Fanatic Join Date: Jul 2009 Location: Kaiserslautern, Germany Posts: 4,391 Drives: your mom to church Rep Power: 296	258 is low, dyno avg is between 270-280

08-13-2009, 08:36 PM	#8 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1118	guys, different dynos read lower and higher on the same exact car. Im sorry to say but this thread was doomed before it started. It depends on the dyno, most low low reading dynos like a mustandyne or a dyno dynamics will read around 260 for a stock Z. A normal reading dyno like a dynojet will run around 270 and a high reader like the dynapaks will run 280 stock. This is not a rule, its just ranges. There are ringers out there.

08-13-2009, 08:36 PM	#9 (permalink)
nogoodname Lifetime Premium Join Date: Nov 2008 Location: Montreal Posts: 22,357 Drives: E46 M3 Rep Power: 1764	what......urs is a 7AT.....i thought it was a 6MT all this time