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-   -   HP Rating NOT Really Overrated As Some Think (http://www.the370z.com/nissan-370z-general-discussions/10985-hp-rating-not-really-overrated-some-think.html)

ZKindaGuy 11-07-2009 09:46 AM

HP Rating NOT Really Overrated As Some Think
 
Just for the heck of it I decided to run some 370Z 1/4-mile track numbers I found on the Internet to see what the HP numbers calculate to using a HP calculator. Here is what I started with:

Best 1/4-mile time I found:

13.1 @ 108.9 MPH

370Z spec:

Bone stock
MT-6
Spec weight
car is 3278 lbs empty
car is 3285 lbs assuming 1 gallon of fuel.

Best 1/4 mile time found: 13.1 seconds

Assuming driver #1 weighs 180 pounds (the weight of an average man) the total weight at race time is: 3465 lbs

Assuming driver #2 weighs 200 pounds (an above average weight) the total weight at race time is: 3485 lbs

Calculation results:

HP with driver #1: 326.94 HP at the flywheel

HP with driver #2: 328.83 HP at the flywheel

So my conclusion is that given the stated Nissan spec rating of 332 BHP the 1/4-mile track numbers tend to support such an OEM rating by +/- 4 HP.

MightyBobo 11-07-2009 10:50 AM

There were people who thought the HP was overrated?

m4a1mustang 11-07-2009 10:57 AM

Yeah, really.

MightyBobo 11-07-2009 11:18 AM

Quote:

Originally Posted by m4a1mustang (Post 270814)
Yeah, really.

You'd think the multitudes of similar dyno graphs would have proven that, and trap speeds in the 1/4th...

semtex 11-07-2009 11:44 AM

Still good info nonetheless.

Lug 11-07-2009 11:56 AM

I've carefully studied the supplied data and have come to one conclusion. I'm fat. :(

F430Spider 11-07-2009 12:05 PM

Quote:

Originally Posted by Lug (Post 270844)
I've carefully studied the supplied data and have come to one conclusion. I'm fat. :(

Rofl

Modshack 11-07-2009 01:55 PM

Here's a link to a few on-line calculators....

Acceleration Calculators

vash_241987 11-07-2009 02:06 PM

Quote:

Originally Posted by ZKindaGuy (Post 270778)
Just for the heck of it I decided to run some 370Z 1/4-mile track numbers I found on the Internet to see what the HP numbers calculate to using a HP calculator. Here is what I started with:

Best 1/4-mile time I found:

13.1 @ 108.9 MPH

370Z spec:

Bone stock
MT-6
Spec weight
car is 3278 lbs empty
car is 3285 lbs assuming 1 gallon of fuel.

Best 1/4 mile time found: 13.1 seconds

Assuming driver #1 weighs 180 pounds (the weight of an average man) the total weight at race time is: 3465 lbs

Assuming driver #2 weighs 200 pounds (an above average weight) the total weight at race time is: 3485 lbs

Calculation results:

HP with driver #1: 326.94 HP at the flywheel

HP with driver #2: 328.83 HP at the flywheel


So my conclusion is that given the stated Nissan spec rating of 332 BHP the 1/4-mile track numbers tend to support such an OEM rating by +/- 4 HP.

ssoooo the fatter you are the more HP your car will have :eek: at my weight a 370z would have 5000000hp :roflpuke2:........but on a serious note what is with the extra weight and the extra 2hp?

Supergoji 11-07-2009 02:18 PM

Quote:

Originally Posted by vash_241987 (Post 270910)
ssoooo the fatter you are the more HP your car will have :eek: at my weight a 370z would have 5000000hp :roflpuke2:........but on a serious note what is with the extra weight and the extra 2hp?

if you make the car heavier and change only the weight while all other stats remain the same, the car has more hp. because it's moving more weight in the same amount of time as the lighter car.

gleonard 11-07-2009 02:25 PM

it means the extra weight would need 2 more hp to go that fast in the 1/4 mile

ZKindaGuy 11-07-2009 02:25 PM

Quote:

Originally Posted by vash_241987 (Post 270910)
ssoooo the fatter you are the more HP your car will have :eek: at my weight a 370z would have 5000000hp :roflpuke2:........but on a serious note what is with the extra weight and the extra 2hp?


HP is actually a function of weight. I know its confusing but think about it this way. The heavier the total load that is moving the greater HP is required to move the load in that given time over that given distance. It isn't that the engine is manufacturing more HP....its that the calculation formula figures the vehicle's HP to be "x" given the stated weight, time, speed and distance traveled. That is why the 1/4 mile is the truest indicator of what a car's HP is on any given run.

Modshack 11-07-2009 02:38 PM

Quote:

Originally Posted by ZKindaGuy (Post 270920)
The heavier the total load that is moving the more HP is required to move the load


Here's a great (funny) article on the whole concept of weight Vs. speed....

SCC Technical Assistance Program

ZKindaGuy 11-07-2009 02:40 PM

Quote:

Originally Posted by MightyBobo (Post 270811)
There were people who thought the HP was overrated?

Yes...actually the Camaro boards are of that opinion (of course). They all think their crap doesn't stink. I saw a new Camaro parked at Summit Racing in Tallmadge, Ohio yesterday. To be honest the car looked like a POS. It was yellow which didn't help..but it looks really cheap...and it looks like an absolute bloated BOAT in its profile...the tires look like mega-balloons. I walked away with the impression that this was the typical "GM doesn't know how to design any car except a Vette" look.


And believe it or not there are some Z folks (mostly 350Z folks) that think the 370Z HP is overrated. And there are a few car-magazines that I have seen it mentioned that whomever was doing the review felt that the 370Z may be overrated in HP.

Needless to say what I showed in my example using actual trap data and the most conservative of assumptions the OEM specified HP for the 370Z has to be very accurate.

Mercennarius 11-07-2009 03:16 PM

Quote:

Originally Posted by ZKindaGuy (Post 270929)
Yes...actually the Camaro boards are of that opinion (of course). They all think their crap doesn't stink. I saw a new Camaro parked at Summit Racing in Tallmadge, Ohio yesterday. To be honest the car looked like a POS. It was yellow which didn't help..but it looks really cheap...and it looks like an absolute bloated BOAT in its profile...the tires look like mega-balloons. I walked away with the impression that this was the typical "GM doesn't know how to design any car except a Vette" look.


And believe it or not there are some Z folks (mostly 350Z folks) that think the 370Z HP is overrated. And there are a few car-magazines that I have seen it mentioned that whomever was doing the review felt that the 370Z may be overrated in HP.

Needless to say what I showed in my example using actual trap data and the most conservative of assumptions the OEM specified HP for the 370Z has to be very accurate.

Given the dyno #s we've seen so far and the trap speeds that have been published it appears the 370Z is underrated more then over rated...though to be honest I think its rated exactly right.

370Zsteve 11-07-2009 03:19 PM

Quote:

Originally Posted by Supergoji (Post 270915)
if you make the car heavier and change only the weight while all other stats remain the same, the car has more hp. because it's moving more weight in the same amount of time as the lighter car.

:roflpuke2::roflpuke2::roflpuke2:

ZKindaGuy 11-07-2009 03:49 PM

Quote:

Originally Posted by Supergoji (Post 270915)
if you make the car heavier and change only the weight while all other stats remain the same, the car has more hp. because it's moving more weight in the same amount of time as the lighter car.

Well not exactly...The engine is NOT manufacturing more HP...its saying the HP at the flywheel had to be "x" to move the car the given run's speed, distance, time and given weight at the time of the run.

Z eliminator 11-07-2009 04:11 PM

Go to the drag section My 370 7 At ran 12.8009. on street tires. 19's/
i just missed 12.7 the car has bolts ons and i dynoed at 291.6 RWHP.
The dyno read low.
What horse power would you rate myt car at/

semtex 11-07-2009 04:23 PM

Quote:

Originally Posted by Z eliminator (Post 270968)
Go to the drag section My 370 7 At ran 12.8009. on street tires. 19's/
i just missed 12.7 the car has bolts ons and i dynoed at 291.6 RWHP.
The dyno read low.
What horse power would you rate myt car at/

How do you figure the dyno read low? Dynos measure HP at the wheels, not HP at the flywheel.

Kones 11-07-2009 04:30 PM

Quote:

Originally Posted by ZKindaGuy (Post 270929)
Yes...actually the Camaro boards are of that opinion (of course). They all think their crap doesn't stink. I saw a new Camaro parked at Summit Racing in Tallmadge, Ohio yesterday. To be honest the car looked like a POS. It was yellow which didn't help..but it looks really cheap...and it looks like an absolute bloated BOAT in its profile...the tires look like mega-balloons. I walked away with the impression that this was the typical "GM doesn't know how to design any car except a Vette" look.


And believe it or not there are some Z folks (mostly 350Z folks) that think the 370Z HP is overrated. And there are a few car-magazines that I have seen it mentioned that whomever was doing the review felt that the 370Z may be overrated in HP.

Needless to say what I showed in my example using actual trap data and the most conservative of assumptions the OEM specified HP for the 370Z has to be very accurate.

So people who don't have our car like to think it's not as good as their car. That's just basic human behavior. We all know our cars are great, and perform as advertised, or better in many cases. So, I'm satisfied, people will always talk crap.

MightyBobo 11-07-2009 04:30 PM

Quote:

Originally Posted by semtex (Post 270979)
How do you figure the dyno read low? Dynos measure HP at the wheels, not HP at the flywheel.

I think he means the dyno reads low compared to other dyno's.

Either way though, depending on the boltons, seems like about right to me, though...

ZKindaGuy 11-07-2009 09:11 PM

Quote:

Originally Posted by MightyBobo (Post 270984)
I think he means the dyno reads low compared to other dyno's.

Either way though, depending on the boltons, seems like about right to me, though...

No Semtext was right... I too think the guy wasn't thinking dyno RWHP v. track crank-HP.

ZKindaGuy 11-07-2009 09:31 PM

Quote:

Originally Posted by Z eliminator (Post 270968)
Go to the drag section My 370 7 At ran 12.8009. on street tires. 19's/
i just missed 12.7 the car has bolts ons and i dynoed at 291.6 RWHP.
The dyno read low.
What horse power would you rate myt car at/

Your crank HP would be as follows:

Assuming:
180# body weight
assuming 1 gallon fuel and mods equal to OEM parts in weight
= 3465 lbs total weight

343 crank HP which means your mods are netting you a real +10 HP gain at the flywheel. Forget the dyno crap because they are estimates at best. The track HP is the real truth of the matter as it is a test based on the real loads experienced by the vehicle.

kannibul 11-07-2009 09:58 PM

Quote:

Originally Posted by ZKindaGuy (Post 270778)
Just for the heck of it I decided to run some 370Z 1/4-mile track numbers I found on the Internet to see what the HP numbers calculate to using a HP calculator. Here is what I started with:

Best 1/4-mile time I found:

13.1 @ 108.9 MPH

370Z spec:

Bone stock
MT-6
Spec weight
car is 3278 lbs empty
car is 3285 lbs assuming 1 gallon of fuel.

Best 1/4 mile time found: 13.1 seconds

Assuming driver #1 weighs 180 pounds (the weight of an average man) the total weight at race time is: 3465 lbs

Assuming driver #2 weighs 200 pounds (an above average weight) the total weight at race time is: 3485 lbs

Calculation results:

HP with driver #1: 326.94 HP at the flywheel

HP with driver #2: 328.83 HP at the flywheel

So my conclusion is that given the stated Nissan spec rating of 332 BHP the 1/4-mile track numbers tend to support such an OEM rating by +/- 4 HP.

You might have to account for drag and tire slip, and it'll probably tie out.

ZKindaGuy 11-08-2009 08:44 AM

Quote:

Originally Posted by kannibul (Post 271369)
You might have to account for drag and tire slip, and it'll probably tie out.

Very true! Thanks!

j.arnaldo 11-08-2009 11:22 AM

I read somewhere else in these threads that they did a dynamometer test on a GT-R, and the results were 510hp, instead of 480!!! Hard to swallow, man!...???

vipor 11-08-2009 12:46 PM

Quote:

Originally Posted by j.arnaldo (Post 271855)
I read somewhere else in these threads that they did a dynamometer test on a GT-R, and the results were 510hp, instead of 480!!! Hard to swallow, man!...???

that's what she said :bowrofl:

Z eliminator 11-08-2009 12:52 PM

My base line dyno was 260.5 RWHP. with a warm engine. It made 266 on a cool engine.
all my #s are RWHP.


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