Dyno tests confirm Nissan GT-R drivetrain loss, power ratings

[VH_Supra26]

by Ralph Hanson
http://www.motorauthority.com/content/thumbs/n/i/nissan_gt_r_main_5_630-1230-636x360.jpg
The rumors that Nissan has fudged the figures on its horsepower rating are laid to rest...mostly

Testing cars for power ratings is a tough and tricky business - accounting for different conditions, locations, equipment and techniques can make it tough to generalize results. And to make matters worse, there is often a lot of guesswork employed to get between real, delivered wheel horsepower and output at the crankshaft, or vice-versa. A recent test of Nissan's GT-R has answered some of the ongoing questions of how it performs so well, however, and taken a good bit of the fiction out of the process.

Rumors and reports from around the web have been claiming Nissan's stated figures for the GT-R's twin-turbo V6 are understated ever since it began its remarkable climb up the many performance charts. All-wheel drive and tons of rubber just couldn't make up for the massive power deficit, they claimed. But it turns out Nissan's claimed 473hp (353kW) figure isn't far from the truth at all, according to MotorTrend. The torque numbers are about 40lb-ft (54Nm), or roughly 9%, larger than Nissan's 434lb-ft (588Nm) rating, and could help explain a little of the car's low-end acceleration abilities.

The key to this latest round of testing is the use of Hyper Power Dynamometer's DYNOmite, which allows testing not just of engine output, but of powertrain drag. After a dyno pull, instead of ceasing to record data, the machine records the slow-down period, and measures the drag due to the car's powertrain, including engine, transmission and wheels.

The end result? As physics would suggest, the parasitic losses of the drivetrain increase with speed, varying from 23hp (17kW) at 50mph to 84hp (62kW) at 100mph. That works out to a real-world inefficiency ranging between 5-17%, depending on speed - quite good for an AWD car.

One thing to keep in mind, however, is that this is just one particular example of the car - power figures can and will vary from vehicle to vehicle. It will simply take time and repetition to see if these results are more or less representative of the general population of Nissan GT-Rs than previous tests. The method, however, is a definite improvement.

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http://www.motorauthority.com/dyno-tests-confirm-nissan-gt-r-drivetrain-loss-power-ratings.html

[MR.BallisticKrU]

go figure

[sherpagoodness]

good to see realistic improvements in dynamometer technology/software

[pizzaguy]

rabble rabble rabble Lies rabble rabble rabble ZO6 & ZR1 rabble rabble rabble Warranty void rabble rabble rabble VDC=Broken Tranny rabble rabble rabble Porsche 911 rabble rabble rabble Boost increase rabble rabble rabble

I'm waiting for those comments to pop up. J/k still it's very impressive.

[inferno14u]

rabble rabble rabble Lies rabble rabble rabble ZO6 & ZR1 rabble rabble rabble Warranty void rabble rabble rabble VDC=Broken Tranny rabble rabble rabble Porsche 911 rabble rabble rabble Boost increase rabble rabble rabble

I'm waiting for those comments to pop up. J/k still it's very impressive.

That is a very impressive seinkonnen impression....

[Replica]

rabble rabble ZR1! rabble rabble

[eN_2_Oh]

^^^:rofl:

but 5-17% is real good for AWD car, especially with how bulky that tranny is.

[CHINGONE]

That is a very impressive seinkonnen impression....

lol, spot on.

[seinkonnen]

That is a very impressive seinkonnen impression....

Look, I am sorry that I am smarter than you... but there is not much I can do about it. Get over it and move on.

Besides, I have known from the beginning exactly how much power the GTR is making because I just happen to know what I am talking about. I never bought into the claims that Nissan was lying.

From a post I made to my website in APRIL 2008:

Motor Trend’s Angus MacKenzie has a recap of his last 24 hours participating in a Nissan 360 press event. One of his more interesting notes is that Motohiro Matsumura, president of Nissan Technical Center North America, promises that the Nissan GT-R really is only making 480hp. Motor Trend’s previous dyno test indicating a wheel horsepower rating of 430hp for the GTR was right; however their factored in drive-train loss of 15% was wrong, and as such, so was their claim of 507hp. Matsumura says the car actually has a remarkable drive-train loss of only 10% thanks to the use of ultra low friction ball bearings in the wheel hubs and transmission, as well as a very accurate alignment of the car’s AWD prop shafts.

MacKenzie says Motor Trend plans to examine Matsumura’s claim of a 10% drive-train loss with some coast down tests of the car in the near future.

[inferno14u]

Look, I am sorry that I am smarter than you... but there is not much I can do about it. Get over it and move on.

Besides, I have known from the beginning exactly how much power the GTR is making because I just happen to know what I am talking about. I never bought into the claims that Nissan was lying.

From a post I made to my website in APRIL 2008:

For someone claiming to be smarter than someone, you sure seem to have a hard time comprehending what I typed. You should get over yourself and then you might realize that we are all having a nice little chuckle at your expense and you fell right into our expectations. Thanks for the laugh.:thumb:

[i-vtec195]

From a post I made to my website in APRIL 2008:

why don't you just stay over there?? :hsugh:









must not get a lot of traffic. :kekegay:

[vtecPWR]

For someone claiming to be smarter than someone, you sure seem to have a hard time comprehending what I typed. You should get over yourself and then you might realize that we are all having a nice little chuckle at your expense and you fell right into our expectations. Thanks for the laugh.:thumb:

fell for the tarp!

[i-vtec195]

i think someone's manic bi-polar. :hsugh:

[seinkonnen]

i think someone's manic bi-polar. :hsugh:

No, I just realize some of you (read: the two of you) people are entirely too stupid for me to reply to anymore.

Not once have I ever had an actual car conversation with the two of you. It's always me talking/arguing about cars with someone else and you coming in to tell me how I ride GM's nuts or how you're angry that you're mentally retarded and can't follow along with the discussion.

[i-vtec195]

that's funny... i can remember quite a few track related arguments, in which you made yourself look like quite a tard.

[Replica]

that's funny... i can remember quite a few track related arguments, in which you made yourself look like quite a tard.
Hey, Seinkonnen is smarter because he says so. Isn't that enough? Or is this not like the ZR1 VS GTR argument? It's just better, because.

[i-vtec195]

oh no, you didn't... :nono:

[seinkonnen]

that's funny... i can remember quite a few track related arguments, in which you made yourself look like quite a tard.

OH RIGHT! You mean that argument wherein I said the track was short and you said it was really long and then compared it to Tsukuba which you considered to be small... Only to find out the other track was only something like .5 miles longer? Good times.

[seinkonnen]

Hey, Seinkonnen is smarter because he says so. Isn't that enough? Or is this not like the ZR1 VS GTR argument? It's just better, because.

Seinkonnen is smarter because he says so yes. And the ZR1 is better then the GTR because it's fucking obvious.

[inferno14u]

No, I just realize some of you (read: the two of you) people are entirely too stupid for me to reply to anymore.

Not once have I ever had an actual car conversation with the two of you. It's always me talking/arguing about cars with someone else and you coming in to tell me how I ride GM's nuts or how you're angry that you're mentally retarded and can't follow along with the discussion.

Wow. I never thought that it would actually be so easy to get under your skin. Thanks for again showing your "intelligence".

[CHINGONE]

fell for the tarp!

ITS A TARP!!!!

[Em1_Kid]

lol

[seinkonnen]

Wow. I never thought that it would actually be so easy to get under your skin. Thanks for again showing your "intelligence".

Do you think it would be enjoyable if the same two or three people replied to every one of your comments saying exactly the same shit over and over and over? It's not like you just started trolling me, you've been doing it for awhile. Pretty annoying I must say. I'll probably just retire from this section soon. It's not fun anymore.

[i-vtec195]

Do you think it would be enjoyable if the same two or three people replied to every one of your comments saying exactly the same shit over and over and over?

use your brilliance to sit back and ponder the point of the joke at your expense, and why you flat out annoy so many people here... might just have an epiphany.

I'll probably just retire from this section soon. It's not fun anymore.

i'm sure many tears would be shed... :(

[inferno14u]

Do you think it would be enjoyable if the same two or three people replied to every one of your comments saying exactly the same shit over and over and over? It's not like you just started trolling me, you've been doing it for awhile. Pretty annoying I must say. I'll probably just retire from this section soon. It's not fun anymore.

If by trolling you, you mean having a differing opinion on some subjects, then sure, I'm guilty. You can feel free to type anything you want in this section as are any of us. If you need a list of forum sites where there are more people as close minded and biased as yourself, I would be more than happy to help you, but for some reason, I think you might be a member of some of those sites already.

[mista_chewey]

keep it up guys you might get him to leave

[blackonblacksls]

Well yeah, when you make a tranny out of glass and paper mache i would imagine it doesnt soak up too much power.

[azinwood]

good to know, that means with more HP this thing will be really fast!@