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-   -   not shocking - Nissan GT-R hub dyno results (http://www.motorworld.net/forum/showthread.php?t=56077)

79TA 05-02-2008 03:51 AM

not shocking - Nissan GT-R hub dyno results
 
This is from December 2007 . . .

http://jpcnews.blogspot.com/2007/12/...published.html


Best Car had their GT-R put on a hub dyno and it made the claimed flywheel number at the hubs.

The number was 354.5 kilowatts while the claimed number was 353. In horsepower, that's 475.4 hp at the hubs and the familiar claimed 473 at the crank.

Soo, figuring in 10% drivetrain loss, that would be a whopping 528.2 horsepower at the flywheel. Of course, 10% is just a guess (there'd be less power loss without the wheels on . . . that's why I used a more conservative 10% instead of 15% but that's no guarantee of accuracy.) The other earlier threads on GT-R dyno numbers shows that this is not the first or last word on GT-R dyno runs.

http://www.motorworld.net/forum/showthread.php?t=55448

http://www.motorworld.net/forum/showthread.php?t=55143

Pokiou 05-02-2008 09:28 AM

Lol.

5vz-fe 05-02-2008 10:00 AM

The thing with turbo cars is that it's highly dependent on air temp, humidity. Who knows, maybe given the right time, it might produce 600hp at the crank.

toffytofik 05-02-2008 10:03 AM

Quote:

Nissan engineers insist the GT-R really does only have 480 hp.

Motohiro Matsumura, president of Nissan Technical Center North America, Inc. in Farmington Hills, Michigan, says our dyno test story, which revealed the GT-R develops 430 hp at the wheels, is basically right. But he insists our estimate of a minimum 15-percent friction losses -- which suggests the GT-R is making 507 hp -- is wrong. Matsumura-san says ultra-low friction bearings in the wheel hubs and transmission, plus the careful alignment of the all-wheel-drive system's propshafts, mean friction losses are reduced to an unprecedented 10 percent or so. We're going to get a GT-R back and conduct some coast-down tests to see if he's right.

http://image.motortrend.com/f/new-ca...issan-gt-r.jpg

http://blogs.motortrend.com/6247428/...ned/index.html
True or false, that doesn't really matter even if it has some 20-30 hp over the official 480 rating. It's blistering pace relative to the competition isn't about the power-to-weight advantage anyways. I pretty much thought everyone was satisfied with the drag strip test results, no?

Hopefully there'll come the day when all of us will finally learn to appreciate true engineering efforts and leave that stupid hate and stubborn domestic fanboyism behind the door.

RC45 05-02-2008 11:44 AM

Quote:

Originally Posted by toffytofik (Post 828725)
True or false, that doesn't really matter even if it has some 20-30 hp over the official 480 rating. It's blistering pace relative to the competition isn't about the power-to-weight advantage anyways. I pretty much thought everyone was satisfied with the drag strip test results, no?

Hopefully there'll come the day when all of us will finally learn to appreciate true engineering efforts and leave that stupid hate and stubborn domestic fanboyism behind the door.

What stupid hate and stubborn domestic fanboyism?

Until I see a GT-R line up against a CGT and go head to head, and actually witness a GT-R blowing the CGT into the weeds I for one call complete bullshit.

Nossan should have stuck to their original pan of "beating the 911 Turbo"

But making up crap that their car would dominate and anihilate the likes of the RT12, Enzo, CGT and Koeniggsegg is laugable.

Note the debate is not aboue Z06 or 911Turbo vs GT-R - so you may as well give up your domestic hate... there is no "domestic" anything in this debate.

Not sure if yo uhave been in and/or aournd the cars mentioned, but the RT12 and CGT are frighteningly fast... and its not just 0-60 in 3.xs tht is fast, we are talking corner entry, mid corner, corner exit, straight away etc.

And to achieve that level of performance to extreme power and weight loss - are we now all to believe that Nissan somehow, in a $75,000 car that uses barely any lightweight exotic structurale material has been able to take a 800lb heavier and 200hp weaker car and somehow made it FASTER??

Please - this is as absurd as someone showing up at an F1 race with an F3000 car and claiming to have a higher lap time than the qualifier.

If thats the case, then lets see it on track side by side.

Because if ture, then this 7:30 time means that the GT-R will visible blow a CGT and RT12 into the weeds.

We are talking anihilate them on the straights, pass them up the inside of corners and outbrake them round the outside dominaiton.

Surely, if possible then Nissan have just reinvented the automobile and every other light weight high power should just go home.

I mean, this GT-R is faster around the 'Ring than even a Caterham Superlight 400?

Bull - shit :)

I am sure, if this was the case, then Porsche AG would already have been seen thrashing a GT-R around the ring by autospys.

After all, Nissan just rendered all the CGT weight savings pointless. :rolleyes:

79TA 05-02-2008 01:56 PM

Quarter mile results? The trap speed says the most about horsepower. This 480 hp 3850 lb car hit 121 mph . . . there are plenty of drag oriented cars with similar ratings that can hook up but still can't achieve that. Yes, I am suspicious. My guess is still 510-515 bhp. a 7-8% difference in power (if only that much) is a pretty major difference. I'd gladly take a 7-8% boost in power in any of my vehicles.

toffytofik 05-02-2008 02:28 PM

Quote:

Originally Posted by 79TA (Post 828771)
Quarter mile results? The trap speed says the most about horsepower. This 480 hp 3850 lb car hit 121 mph . . . there are plenty of drag oriented cars with similar ratings that can hook up but still can't achieve that. Yes, I am suspicious. My guess is still 510-515 bhp. a 7-8% difference in power (if only that much) is a pretty major difference. I'd gladly take a 7-8% boost in power in any of my vehicles.

I myself believe it outputs more than 480hp despite what the president of Nissan Technical Center North America assure us of. Anyway, i'd like to see someone taking that VR38 engine for some real crank measurements and to see what it's really losing through the drivetrain. I'm very curious. Ultra-low friction bearings aside :-D

HeilSvenska 05-02-2008 02:32 PM

Makes you wonder why all manufacturers wouldn't adhere to just one standard in power measuring. Or why a company would intentionally lie...

CarlZ 05-02-2008 04:00 PM

I find this funny. How often do you see car company saying that their car has less bhp than it actually has? Like is it a bad thing now? lol
And why should they lie, couse if they are this is going to be discovered eventually...

5vz-fe 05-02-2008 06:29 PM

Lower HP means you are competing with a lower class of cars in terms of power. Giving it an advantage in the market segment to justify the higher price. Or make it look like an engineering marvel.

Keep in mind that turbo charging is the easiest way to make HP, so claiming to make 550 from a 3.8 engine is not as jaw dropping as having ~470 hp and beating anything up to 650. Thus "proving" its advance chassis design, drivetrain, and engine tuning.

It's more about brand polishing than it's about cars ;) This is a product to make ppl that can't afford a GT-R believe they are getting similar treatment in the POS lower lineup.

79TA 05-02-2008 06:59 PM

Quote:

Originally Posted by CarlZ (Post 828799)
I find this funny. How often do you see car company saying that their car has less bhp than it actually has? Like is it a bad thing now? lol
And why should they lie, couse if they are this is going to be discovered eventually...

With the GT-R, it's not a slight underestimate (like in the case of the last 8.3 litre vipers that had power outputs that might vary +/- 1%) Either the wizardry of the GT-R is real, or they're simply hiding the true power output. It's deceptive with no legitimate excuse. I said this once before but I'll say it again. I'm sure the Nissan engineers aren't so lousy that they can't figure out how much power the engine is putting out.

RC45 05-02-2008 07:14 PM

Quote:

Originally Posted by 79TA (Post 828820)
With the GT-R, it's not a slight underestimate (like in the case of the last 8.3 litre vipers that had power outputs that might vary +/- 1%) Either the wizardry of the GT-R is real, or they're simply hiding the true power output. It's deceptive with no legitimate excuse. I said this once before but I'll say it again. I'm sure the Nissan engineers aren't so lousy that they can't figure out how much power the engine is putting out.

I bet it has an adaptive overboost ability, and on the road course it simply boosts power to 700bhp when needed ;)

pagani 05-02-2008 07:54 PM

Quote:

Originally Posted by RC45 (Post 828744)
What stupid hate and stubborn domestic fanboyism?

Until I see a GT-R line up against a CGT and go head to head, and actually witness a GT-R blowing the CGT into the weeds I for one call complete bullshit.

Nossan should have stuck to their original pan of "beating the 911 Turbo"

But making up crap that their car would dominate and anihilate the likes of the RT12, Enzo, CGT and Koeniggsegg is laugable.

Note the debate is not aboue Z06 or 911Turbo vs GT-R - so you may as well give up your domestic hate... there is no "domestic" anything in this debate.

Not sure if yo uhave been in and/or aournd the cars mentioned, but the RT12 and CGT are frighteningly fast... and its not just 0-60 in 3.xs tht is fast, we are talking corner entry, mid corner, corner exit, straight away etc.

And to achieve that level of performance to extreme power and weight loss - are we now all to believe that Nissan somehow, in a $75,000 car that uses barely any lightweight exotic structurale material has been able to take a 800lb heavier and 200hp weaker car and somehow made it FASTER??

Please - this is as absurd as someone showing up at an F1 race with an F3000 car and claiming to have a higher lap time than the qualifier.

If thats the case, then lets see it on track side by side.

Because if ture, then this 7:30 time means that the GT-R will visible blow a CGT and RT12 into the weeds.

We are talking anihilate them on the straights, pass them up the inside of corners and outbrake them round the outside dominaiton.

Surely, if possible then Nissan have just reinvented the automobile and every other light weight high power should just go home.

I mean, this GT-R is faster around the 'Ring than even a Caterham Superlight 400?

Bull - shit :)

I am sure, if this was the case, then Porsche AG would already have been seen thrashing a GT-R around the ring by autospys.

After all, Nissan just rendered all the CGT weight savings pointless. :rolleyes:

Don't forget that the nissan gtr r35 is meant is a everyday supercars and it's as easy to drive as a nissan micra
Most people will find it pretty easy to set fast times whit the gtr
But the cgt is more for the hardcore/expert driverss that have plenty of skill so it will be allot harder to set fast times (99.9%) of drives will find it trickey car to drive hard.
Anyway i can't wait wath sort of times the real production gtr's will set.
Maby the will set slower set wo cars.
So please stop comparing a awd to rwd car

RC45 05-02-2008 09:33 PM

Quote:

Originally Posted by pagani (Post 828828)
Don't forget that the nissan gtr r35 is meant is a everyday supercars and it's as easy to drive as a nissan micra
Most people will find it pretty easy to set fast times whit the gtr
But the cgt is more for the hardcore/expert driverss that have plenty of skill so it will be allot harder to set fast times (99.9%) of drives will find it trickey car to drive hard.
Anyway i can't wait wath sort of times the real production gtr's will set.
Maby the will set slower set wo cars.

Everything you typed means noting - the GT-R crushed the CGT, Ezno, Zonda, Veyron, Superlight, Radical and tweaked GT2.

Why bring in anything about "regular drivers" - they ar enot being discussed.

Quote:

Originally Posted by pagani (Post 828828)
So please stop comparing a awd to rwd car

Why not?

BTW, the Veyron and RT12 are AWD cars.

I am not sure i fyou saw the news, but the GT-R crushed the CGT, Ezno, Zonda, Veyron, Superlight, Radical and tweaked GT2 - that means Nissan took an 1800kg car with 480bhp and slower acceleration than anyone else, and went faster.

What' not to compare?

5vz-fe 05-02-2008 09:41 PM

Quote:

Originally Posted by pagani (Post 828828)
So please stop comparing a awd to rwd car

It is interesting that you brought this up.
You should have noticed that all cars that set quick times are RWD. The closest AWD with that kinda weight is the LP640, and it's lapping at 7:40 with 640hp ;-) Of course, no one knows if it's wearing PZ Corsa or PZ Rosso.

But setup to setup, I will give the advantage to the lambo given the much lower center of gravity and the ceramic brakes means lower unsprung weight.


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