482 ps (475 hp) and 59.2 kg/m (428 ft-lbs) at the hubs.





Results will be printed in the 12/25 issue of Bestcar. Also said that the limiter came on in 4th gear so there should be more potential.

Thanks to Zakira for the translation.

http://minkara.carview.co.jp/userid/149571/blog/c227132/

Nice, so a customer already took his new GTR into Super Autobacs for confirmation on the stated numbers.

To the wheels, or the crank?

Neither exactly, but should be very close to at the wheels

What the heck is at the hubs??? I guess I am not a dyno guru, so im not sure what that means.

Unless the power is measured near the wheels after all of the rotating power-reducing elements such as driveshafts and AWD trickery and what not, then you might as well say that is at the crank.

Surprised at the torque curve.

Its nothing like the flat curve between 3200 and 5200RPM from Nissan.

I know the dyno is dynamic but the lack of torque at 3200 RPM is not good.

Paul

Look at the pictures. Hubs are what wheels mount on. Ever change a wheel? Did you bolt the wheel to the crankshaft?

So yes, it is after the entire drivetrain, the only thing piece missing is the loss between tire/wheel and dyno rollers on a typical dyno.

This post has been edited by sdiver68: Dec 14 2007, 02:55 PM

well thats nice to see. the new gt-r is well under rated. thats somewhere around 530-550bhp depending on drivetrain loss. dynopacks read a little on the low side. cant wait to see it on a dynojet. well that explains the power to weight ratio that everyone has be arguing back and forth. im so anxious to get one, this car will make over 700bhp with both ons

This post has been edited by smg944: Dec 14 2007, 03:13 PM

Well you aint gotta be a smart @ss about it. I didnt say "what is a hub". But like I said I am not a dyno guru so I not sure how they are measuring. At the wheels is measured through the wheels on the roller.....well the hubs arent rolling on anything so what the heck is it measuring...maybe it has some type of light senor or magnetic sensor that measures rotataion cycles of the hub. Anyway, explain how it goes then o-might-one.

This post has been edited by Rave426: Dec 14 2007, 03:12 PM

From their website.


http://www.dynapack.com/dynapack.html

The Dynapack uses hydraulic brakes just like an engine dyno that measures from the crank. They are attached directly to the hubs in place of the wheels. Dynapack says this eliminates the tire slippage that can occur with inertial (drum) type dynos. It is measuring the power to the hubs of the car so it includes any drive train loss but does not include tire slippage if any. All we need now is the drive train efficiency and we can calculate the horsepower. 480 is not the horsepower number. It is higher. And the torque is understated. I don’t remember Nissan saying the torque curve was flat but that there was X amount of torque available between 3200 and 5200RPM but even the torque measured is low at 3200RPM. It does flatten out at 4500 though. The trace drops dramatically at 6200 so this is probably the limiter kicking in and robbing the power. I would like to see a complete run to know what the real numbers are.

Well this guy feels it would be 554 hp, if measured on rollers:

http://minkara.carview.co.jp/userid/241145/blog/7134633/

He's using a factor of 1.15, which seemed to be the case with an Impreza they ran.


A bit of correction in my original translation. This dyno run will be covered on the GT-R issue of Bestcar magazine, available 12/25.

Really that 475 seems a bit high to be at the wheels. AWD systems usually have >20 (sometimes >25%) drivetrain loss. That would put the crank power at 570+......which sounds good for the ring time/weight argument but it doesnt add up for a top speed of less than 200mph for a car with a .27 cd.

I would like to see different run on a wheel/roller dyno.

Nissan has already given us the GT-R's drivetrain loss value, and it's 15%. calculating from there, it indeed is around somewhere around 530-550 ponies at crank.

Where did you see that drivetrain loss figure?

Pretty much confirms what I've been saying all along. The GT-R is WELL underrated in power...at least the JDM is anyway.

Wait!! I looked closely at the pics and the screen says flywheel so it is alredy doing a conversion calculation.

Pretty much what everyone's been saying. It doesn't take much upstairs to deduce that...

If the loss is 15% then that number is believable..........but 15% is VERY low. The GTR has more AWD components than any other AWD car....so that would equate to even more losses.

Scratch that. I called DynapacK and was told that the machine has the ability to convert but in the picture you look at the "TCF" box and that tells you what is the conversion calculation being used. In the pics it says "1.00" so that is what the cars made at the wheels. Sorry for the last post.

This post has been edited by ghotnit: Dec 14 2007, 04:14 PM